Microwave Reflectometry in TJ-II
|
|
- Katrina Gallagher
- 5 years ago
- Views:
Transcription
1 Microwave Reflectometry in TJ-II E. Blanco, T. Estrada, L. Cupido*, M.E. Manso*, V. Zhuravlev** and J. Sánchez Laboratorio Nacional de Fusión, Asociación Euratom-CIEMAT, Madrid, Spain Abstract *Associação Euratom-IST, CFN, Instituto Superior Técnico, Lisboa, Portugal ** Institute of Nuclear Fusion, RNC Kurchatov Institute, Moscow, Russia Reflectometry measurements have permitted the characterization of the perpendicular velocity shear layer that develops spontaneously above a critical plasma density value. These observations have been crosschecked with the results obtained using a twodimensional full-wave code that we have developed to help in the interpretation of the experimental data. Both experimental and numerical results demonstrate the capability of the reflectometer to measure the velocity shear layer with a high spatial resolution. The experiments also show modifications in the spectra linked to the presence of a low order rational surface in the rotational transform profile. This modification in the spectra is interpreted in terms of a localized increase in the perpendicular velocity of the density fluctuations. However, quantitative information on the rotation velocity is not available with the present experimental set-up. The last section of the paper is devoted to study the viability of the Doppler reflectometry technique to measure the rotation velocity in TJ-II using the 2D full-wave code. Introduction Microwave reflectometry has been applied to the measurement of density profiles since more than 15 years [1]. The determination of the density profile by microwave reflectometry requires the measurement of the time delay (phase delay) of a probing beam reflected by the plasma cut-off layer. Different techniques were developed to improve the measurement of the time delay, e.g. fast swept frequency modulated continuous wave (FM-CW), amplitude modulated (AM), two frequency differentialphase or pulse radar systems. An amplitude modulation reflectometer is in operation in the stellarator TJ-II working in the frequency range from 25 to 45 GHz with X-mode polarization, and covering densities from.3 to m -3. The reflectometer works routinely and it is capable of measuring even in conditions of high turbulence. A complete description of the system can be found in [2]. A second reflectometer for density fluctuation measurements is installed in TJ-II. The reflectometer is a broadband fast frequency hopping heterodyne system [3]. The system allows us to probe several plasma layers within a short time interval during the discharge. The reflectometer works in the frequency range from 33 to 5 GHz with X-mode polarization, and covers densities from.3 to m -3. This is almost the whole density range of the TJ-II plasmas heated by ECH. However, due to the flat density profiles (or even hollow) of the ECH plasmas and the low magnetic field gradient in TJ-II, the accessible radial range is limited to ρ The antennae arrangement was designed to view the plasma perpendicularly to the cut-off layer. However, a small misalignment may exist as it is seen in the measurements. This small misalignment in the antennae arrangement has allowed the characterization of perpendicular velocity shear layers in the plasma, and to study the modifications of the spectra in the reflectometer signals linked to the presence of low order rational surfaces in the plasma. We have also developed a twodimensional full-wave code to help in the interpretation of the reflectometer signals.
2 The code uses the Finite-Difference Time-Domain technique to solve the wave propagation in magnetised and turbulent plasmas. Realistic plasma shape, density profile, magnetic configuration, and antennae arrangement are included to reproduce as much as possible the experimental conditions in TJ-II. A complete description of the code can be found in [4]. 1.- Characterization of perpendicular velocity shear layers As it has been reported [5] a perpendicular velocity shear layer develops spontaneously at the plasma edge of TJ-II above a certain plasma density. This spontaneous shear flow appears close to the Last Closed Magnetic Surface (LCMS). In this region, Langmuir probes can be used to characterize it. This phenomenon has been studied modulating the plasma density around the critical value (which is around m -3 for the standard magnetic configuration). The reflectometer is tuned to a low and fixed frequency (34 GHz) to probe a layer close to the radial position of the Langmuir probes. The reversal in the perpendicular phase velocity observed by the Langmuir probes is also observed in <n e > (1 19 m -3 ) <n e > 1 a) <f> # t (ms) power (db) # ms b) ms -5 5 f (khz) Figure 1. a) average plasma density (solid line) and mean frequency of the complex amplitude ( Ae i! ) spectra of the reflectometer signal. b) power spectra in two different time intervals with densities below (17-18 ms) and above ( ms) the critical density. the reflectometer signals. Figure 1(a) shows the time evolution of the averaged density (solid line) and the mean frequency of the complex amplitude spectra (Ae iφ ) of the reflectometer signals (dotted line). Figure 1(b) shows the power spectra of the complex amplitude obtained in two different time intervals where the density is lower (17-18 ms) and higher ( ms) than the critical value. It can be seen that as the density increases from.4 to m -3, the mean frequency of the spectra changes its sign indicating a reversal in the perpendicular rotation velocity of the plasma. This behaviour agrees with the perpendicular phase velocity measured by Langmuir probes [6]. The behaviour of the turbulence rotation for inner radial locations where Langmuir probes measurements are no available has been studied changing the reflectometer frequency in a staircase mode during the discharge and changing the plasma density from shot to shot. Figure 2 summarized the results for three different average plasma densities. Figure 2(a) shows the temporal evolution of the averaged plasma density for three different discharges (shot #11294 with an average density above the critical value, shot #11291 close to the critical value, and #11289 below the critical value). It also shows the changes in the reflectometer frequency versus time. Figure 2(b) shows the mean frequency of the complex amplitude spectra measured in the previous discharges. A fourth shot with higher density (solid circles) is also shown. Figure 2(c) plots the
3 same data as a function of the cut-off radius. This figure shows that if the density is lower than the critical value ( m -3 ) all the mean frequencies are positive independently of the radial position. As the density increases up to the critical value, a shear layer develops close to the plasma <n e > (1 19 m -3 ).8.6 a) #11294 #11291 # t (ms) Figure 2. (a) time evolution of the average density in three different discharges (below, close and above the critical value. The staircase variation of the probing frequency is also shown. f RF (GHz) edge (zero crossing at ρ.8). Increasing further the density the shear layer moves to inner radial locations (ρ.75 for an average plasma density of m -3 and ρ.7 for an average density of m -3 ). Figure 2(c) also indicates that the radial separation between points with different sign of the mean frequencies is 1 cm approximately, comparable to the vacuum wavelength of the probing beam. These results indicate that the reflectometer is capable of measuring the inversion of the perpendicular rotation velocity in a very narrow region. The high spatial resolution of the system has been tested with the help of the two-dimensional full-wave code described before. For this study we simulate a velocity shear layer close to the plasma edge. We consider a constant perpendicular b) c) f (GHz) RF ! Figure 2:(b) Mean frequency of the complex amplitude spectra for the different probing frequencies. A four discharge with a higher average density (full circles) is also shown. (c) same data as a function of the cut-off radius velocity of 3 km/s at the plasma edge. This velocity is changed linearly in the shear layer region to a positive value of +3 km/s and it remains constant for inner radial locations. The width of the shear layer is 4 mm approximately. The reflectometer signals are simulated for different probing frequencies within the band 33-5 GHz. First numerical simulations indicate that asymmetric spectra as the ones obtained in the experiments are reproduced for a misalignment in the antennae arrangement as small as two degrees. Thus, we consider this tilt angle in the simulations. Figure 3 shows the spatial dependence of the perpendicular velocity (solid line) and the mean frequencies of the complex amplitude spectra (circles) obtained from the simulations. This figure shows the capability of the reflectometer to measure the velocity shear layer with a spatial resolution of about 1 cm (better than twice the probing wavelengths in vacuum). The complex amplitude spectra for probing frequencies 44, 43, 42, 39, 37 GHz are shown in figure 4. Figure 3 also indicates a notable difference in the mean frequency (absolute value) at the plasma edge and radially inwards. However, the rotation velocity has the same magnitude. This difference can be partially understood in terms of the different
4 curvature of the cut-off layers and the different turbulence amplitude when moving radially inwards. An estimation of the increase in the plasma curvature due to the! f (GHz) 44 v p (m/s) v p (m/s) R (m) Figure 3. Perpendicular velocity and mean frequency of the simulated spectra as a f unction of the major and normalised radius plasma shape of TJ-II gives that the effective tilt angle of the antenna can rise as much as two degrees when moving radially inwards. On the other hand, we consider a constant profile of the normalized density fluctuations ñ/n in these simulations. Therefore the density fluctuation level ñ increases when moving radially inwards and contribute to the asymmetry in the spectra. We have checked that reducing the rms value of the turbulence from 1 to 5 %, the mean frequency decreases in a factor of 2. These simulations show the high spatial resolution of the reflectometer to measure the velocity shear layer. However, the system is not designed as a Doppler reflectometer. Thus, quantitative about the rotation velocity cannot be obtained. Next section is devoted to show the modification in the spectra due to the presence of a low order rational surface and the results are interpreted as an increase in the perpendicular rotation velocity. spectra (a.u.) f (GHz) f(khz)! Figure 5: Spectra measured in a magnetic configuration with iota = 3/2 at!!.65 (in vacuum) spectra (a.u.) f (khz) 2.- Modification of the spectra linked to rational surfaces Modifications in the spectra have been observed in configurations with a low order rational surface at the radial range covered by the reflectometer. In the set of experiments presented in this section, the rational surface 3/2 is located close to ρ =.65. Figure 5 shows the complex amplitude spectra of the reflectometer signal for different radial locations (from ρ =.55 up to ρ =.77). The spectrum at the most internal radial location (ρ =.55) shows a coherent mode of about 1 khz and the spectra modifications appears for the adjacent probing frequencies. The results can Figure 4.- Simulated power spectra for probing frequencies (from top to bottom) 44, 43, 42, 39, 37 GHz
5 be interpreted as a localized increase in the perpendicular rotation velocity of the fluctuations. If we consider that the misalignment of the antennas is two degrees as it was justified before, and we take into account the relatively long probing wavelengths, we conclude that the perpendicular velocity should be as high as 15 2 km/s to reproduce the experimental data. The increase in the perpendicular velocity can be explained if we consider that the magnetic island produces an enhancement in the electron diffusion higher than ion diffusion. The plasma reacts creating a strong positive electric field to preserve the ambipolarity and such strong radial electric field increases the perpendicular rotation velocity of the plasma. A similar phenomenon has been measured using HIBP during the formation of e-itbs triggered by low order rationals [7]. However, as it was mentioned before, absolute values of the rotation velocity cannot be obtained with the present reflectometer. To properly measure the perpendicular rotation velocity of the plasma, a Doppler reflectometer with optimum beam width and beam curvature is needed. In the next section we use the two dimensional full-wave code to obtain the characteristics that a Doppler reflectometer must have to be able to measure the plasma rotation in TJ-II. 3.- Doppler reflectometry studies using the 2D full-wave code The Doopler reflectometry technique allows the determination of the perpendicular rotation velocity of the density fluctuations. An accurate optimisation of the Doppler reflectometer arrangement allows the separation of the different diffraction orders selecting preferentially the order 1 (Bragg backscattered wave in the vicinity of the turning point). The spectral resolution of the system determines its capability to separate the th and 1 st order and the achievement of quantitative values. The relevant parameters for optimisation of the spectral resolution are the antenna pattern (spot size and Figure 6. Complex amplitude spectrum for the standard gain horns intalled i n TJ-II. The tilt angle is 18 degrees and the frequency of the wave is 4 GHz beam curvature) and the antenna tilt angle. In this section, we summarize the simulations that we have done to study the viability of Doppler reflectometry in TJ-II. First numerical simulations indicated that standard gain horns as the ones used in the frequency hopping reflectometer will not work for Doppler reflectometry measurement in TJ-II. As an example, figure 6 shows the simulated spectra with such antenna type. The plasma rotates in the perpendicular direction at a velocity of 3 km/s. The probing frequency is 4 GHz and the antenna tilt angle is 18º with respect to the normal surface of the plasma. The expected Doppler frequency should be located at 25 khz. However, both diffraction orders ( th and 1 st ) are not separated. This is mainly due to a poor spectral resolution of the system consequence of the beam curvature. Simulations were done using gaussian antennas with different beam widths. The cut-off layer is located in the Rayleigh zone of the beam where nearly plane wavefronts exist. We have found from the simulations that the optimum spectral resolution is obtained for a beam waist close to 3 cm as it can be observed in the figure 7. Also it is shown the same results for slab plasma (typical of large machines). In the last case, large beam waist leads to better resolutions.
6 Figure 8 shows the simulated spectra of the complex amplitude for a gaussian beam with the optimum value for the beam waist ( 3 cm). The probing frequency is 4 GHz, the perpendicular velocity of the density fluctuations is 3 km/s and the antenna tilt angle is 18 degrees. According to these parameters, the expected doppler shift should be -25 khz. As it can be seen, the numerical results are in well agreement with the expected Figure 7. Spectral resolution for TJ-II plasmas and slab plasmas as a function of the gaussian beam waist Figure 8. Complex amplitude spectrum for A gaussian beam of 3 cm. The tilt angle is 18 degrees and the frequency of the wave is 4 GHz values and the spectral resolution horns.! f / f is better than that obtained with standard gain D References [1] H. Bottolier and G. Ichtchenko. Rev. Sci. Instrum. 72 (1987) 539 [2] T. Estrada, J. Sánchez, B. van Milligen, L. Cupido, A. Silva, M.E. Manso and V. Zhuravlev. Plasma Phys. Control. Fusion 43 (21) 1535 [3] L. Cupido, J. Sánchez and T. Estrada. Rev. Sci. Intrum. 75 (24) 3865 [4] E. Blanco, S. Heuraux, T. Estrada, J. Sánchez and L. Cupido. Rev. Sci. Intrum. 75 (24) 3822 [5] C. Hidalgo, M.A. Pedrosa, L. Garcia, and A. Ware. Phys. Rev. E 7 (24) 6742 [6] M.A. Pedrosa, C. Hidalgo, E. Calderón, T. Estrada et al. Plasma Phys. Control. Fusion 47 (25) 777 [7] T. Estrada, L. Krupnik, N. Dreval et al. Plasma Phys. Control. Fusion 46 (24) 277
Characterization of the Perpendicular Rotation Velocity of the Turbulence by Reflectometry in the Stellarator TJ-II
1 EX/P5-31 Characterization of the Perpendicular Rotation Velocity of the Turbulence by Reflectometry in the Stellarator TJ-II T. Estrada 1), T. Happel 1), C. Hidalgo 1) 1) Laboratorio Nacional de Fusión.
More informationSpatial, temporal and spectral structure of the turbulence-flow interaction at the L-H transition
Spatial, temporal and spectral structure of the turbulence-flow interaction at the L-H transition T Estrada 1, E. Ascasíbar 1, E. Blanco 1, A. Cappa 1, P. H. Diamond 2, T. Happel 3, C. Hidalgo 1, M. Liniers
More informationPlasma turbulence measured by fast sweep reflectometry on TORE SUPRA
Plasma turbulence measured by fast sweep reflectometry on TORE SUPRA F. Clairet &, L. Vermare &, S. Heuraux, G. Leclert # & Association Euratom-CEA sur la fusion, DSM/DRFC/SCCP C.E. Cadarache, 8 Saint-Paul-lès-Durance,
More informationStudy of Enhanced D α H-modes Using the Alcator C-Mod Reflectometer
Study of Enhanced D α H-modes Using the Reflectometer Y. Lin 1, J.H. Irby, E.S. Marmar, R. Nazikian, M. Greenwald, A.E. Hubbard, J. Hughes, I.H. Hutchinson, B. LaBombard, A. Mazurenko, E. Nelson-Melby,
More informationInfluence of ECR Heating on NBI-driven Alfvén Eigenmodes in the TJ-II Stellarator
EX/P- Influence of ECR Heating on NBI-driven Alfvén Eigenmodes in the TJ-II Stellarator Á. Cappa, F. Castejón, T. Estrada, J.M. Fontdecaba, M. Liniers and E. Ascasíbar Laboratorio Nacional de Fusión CIEMAT,
More informationPhase ramping and modulation of reflectometer signals
4th Intl. Reflectometry Workshop - IRW4, Cadarache, March 22nd - 24th 1999 1 Phase ramping and modulation of reflectometer signals G.D.Conway, D.V.Bartlett, P.E.Stott JET Joint Undertaking, Abingdon, Oxon,
More informationSUMMARY OF EXPERIMENTAL CORE TURBULENCE CHARACTERISTICS IN OH AND ECRH T-10 TOKAMAK PLASMAS
SUMMARY OF EXPERIMENTAL CORE TURBULENCE CHARACTERISTICS IN OH AND ECRH T-1 TOKAMAK PLASMAS V. Vershkov, L.G. Eliseev, S.A. Grashin. A.V. Melnikov, D.A. Shelukhin, S.V. Soldatov, A.O. Urazbaev and T-1 team
More informationOn the physics of shear flows in 3D geometry
On the physics of shear flows in 3D geometry C. Hidalgo and M.A. Pedrosa Laboratorio Nacional de Fusión, EURATOM-CIEMAT, Madrid, Spain Recent experiments have shown the importance of multi-scale (long-range)
More informationTurbulence and geodesic acoustic mode behavioural studies in ASDEX Upgrade using Doppler Reflectometry
1 IAEA-CN-165 / EX / P5-38 Turbulence and geodesic acoustic mode behavioural studies in ASDEX Upgrade using Doppler Reflectometry G.D.Conway 1, C.Tröster 1, J.Schirmer 1, W.Suttrop 1, C.Lechte 2, E.Holzhauer
More informationIon orbits and ion confinement studies on ECRH plasmas in TJ-II stellarator
Ion orbits and ion confinement studies on ECRH plasmas in TJ-II stellarator F. Castejón 1,4, J. M. Reynolds 3,4, J. M. Fontdecaba 1, D. López-Bruna 1, R. Balbín 1, J. Guasp 1, D. Fernández-Fraile 2, L.
More informationReview of Confinement and Transport Studies in the TJ-II Flexible Heliac
Review of Confinement and Transport Studies in the TJ-II Flexible Heliac C. Alejaldre, J. Alonso, L. Almoguera, E. Ascasíbar, A. Baciero, R. Balbín, M. Blaumoser, J. Botija, B. Brañas, E. de la Cal, A.
More informationElectrode and Limiter Biasing Experiments on the Tokamak ISTTOK
Electrode and Limiter Biasing Experiments on the Tokamak ISTTOK C. Silva, H. Figueiredo, J.A.C. Cabral,, I. Nedzelsky, C.A.F. Varandas Associação Euratom/IST, Centro de Fusão Nuclear, Instituto Superior
More informationOverview of TJ-II experiments
1 Overview of TJ-II experiments J. Sánchez and the TJ-II Team Asociación EURATOM/CIEMAT, Av. Complutense 22, 284, Madrid, Spain. BIFI, Zaragoza, Spain. NSC KIPT, Kharkov, Ukraine. RNC Kurchatov Institute,
More informationThe Study of Correlation Properties of Geodesic Acoustic Modes in the T-10 Tokamak
1 The Study of Correlation Properties of Geodesic Acoustic Modes in the T-1 Tokamak A.V. Melnikov 1), L.G. Eliseev 1), S.V. Perfilov 1), S.E. Lysenko 1), V.A. Mavrin 1), R.V. Shurygin 1), D.A. Shelukhin
More informationMHD instability driven by supra-thermal electrons in TJ-II stellarator
MHD instability driven by supra-thermal electrons in TJ-II stellarator K. Nagaoka 1, S. Yamamoto 2, S. Ohshima 2, E. Ascasíbar 3, R. Jiménez-Gómez 3, C. Hidalgo 3, M.A. Pedrosa 3, M. Ochando 3, A.V. Melnikov
More informationRetarding field energy analyzers for the ion temperature measurements in the SOL plasmas of the tokamak ISTTOK and the TJ-II stellarator
Retarding field energy analyzers for the ion temperature measurements in the SOL plasmas of the tokamak I S Nedzelskiy 1 Instituto de Plasma e Fusão Nuclear, Instituto Superior Tecnico, Unuversidade de
More informationEffect of rotational transform and magnetic shear on confinement of stellarators
Effect of rotational transform and magnetic shear on confinement of stellarators E. Ascasíbar(1), D. López-Bruna(1), F. Castejón(1), V.I. Vargas(1), V. Tribaldos(1), H. Maassberg(2), C.D. Beidler(2) R.
More informationEnhanced Doppler reflectometry power response: physical optics and 2D full wave modelling
Enhanced Doppler reflectometry power response: physical optics and 2D full wave modelling J R Pinzón 1,2,3, T Happel 1, E Blanco 4, G D Conway 1, T Estrada 4 and U Stroth 1,2 1 Max-Plank-Institute für
More informationUpper Hybrid Resonance Backscattering Enhanced Doppler Effect and Plasma Rotation Diagnostics at FT-2 Tokamak
Upper Hybrid Resonance Backscattering Enhanced Doppler Effect and Plasma Rotation Diagnostics at FT- Tokamak A.B. Altukhov ), V.V. Bulanin ), V.V. Dyachenko ), L.A. Esipov ), M.V. Gorokhov ), A.D. Gurchenko
More informationLong-Range Correlations and Edge Transport Bifurcation in Fusion Plasmas
EX-C/9-3 Long-Range Correlations and Edge Transport Bifurcation in Fusion Plasmas Y. Xu 1, N. Vianello 2, M. Spolaore 2, E. Martines 2, P. Manz 3, M. Ramisch 3, U. Stroth 3, C. Silva 4, M. A. Pedrosa 5,
More informationMulti-scale turbulence, electron transport, and Zonal Flows in DIII-D
Multi-scale turbulence, electron transport, and Zonal Flows in DIII-D L. Schmitz1 with C. Holland2, T.L. Rhodes1, G. Wang1, J.C. Hillesheim1, A.E. White3, W. A. Peebles1, J. DeBoo4, G.R. McKee5, J. DeGrassie4,
More informationFluctuation Suppression during the ECH Induced Potential Formation in the Tandem Mirror GAMMA 10
EXC/P8-2 Fluctuation Suppression during the ECH Induced Potential Formation in the Tandem Mirror GAMMA M. Yoshikawa ), Y. Miyata ), M. Mizuguchi ), Y. Oono ), F. Yaguchi ), M. Ichimura ), T. Imai ), T.
More informationCorrelation reflectometry in fusion plasmas an application at TEXTOR
Home Search Collections Journals About Contact us My IOPscience Correlation reflectometry in fusion plasmas an application at TEXTOR This article has been downloaded from IOPscience. Please scroll down
More informationRelating the L-H Power Threshold Scaling to Edge Turbulence Dynamics
Relating the L-H Power Threshold Scaling to Edge Turbulence Dynamics Z. Yan 1, G.R. McKee 1, J.A. Boedo 2, D.L. Rudakov 2, P.H. Diamond 2, G. Tynan 2, R.J. Fonck 1, R.J. Groebner 3, T.H. Osborne 3, and
More informationEdge and SOL turbulence on HFS/LFS at ASDEX Upgrade by Microwave Reflectometry
Edge and SOL turbulence on HFS/LFS at ASDEX Upgrade by Microwave Reflectometry V.E. Nikolaeva1,2, M. E. Manso1, L. Guimarais1, U.Stroth3, G. D. Conway3, C. Silva1, and the ASDEX Upgrade team Associação
More informationThe Plasma Phase. Chapter 1. An experiment - measure and understand transport processes in a plasma. Chapter 2. An introduction to plasma physics
The Plasma Phase Chapter 1. An experiment - measure and understand transport processes in a plasma Three important vugraphs What we have just talked about The diagnostics Chapter 2. An introduction to
More informationExcitation of Alfvén eigenmodes with sub-alfvénic neutral beam ions in JET and DIII-D plasmas
Excitation of Alfvén eigenmodes with sub-alfvénic neutral beam ions in JET and DIII-D plasmas D. Borba 1,9, R. Nazikian 2, B. Alper 3, H.L. Berk 4, A. Boboc 3, R.V. Budny 2, K.H. Burrell 5, M. De Baar
More informationCurvature transition and spatiotemporal propagation of internal transport barrier in toroidal plasmas
Curvature transition and spatiotemporal propagation of internal transport barrier in toroidal plasmas K.Ida, JT- Team a and LHD experiment Group National Institute for Fusion Science, Toki 59-59 Japan
More informationDensity Fluctuation in the Tandem Mirror GAMMA 10. A. Itakura, S. Tsunoda, M. Fukuhara, H. Higaki, H. Hojo, M. Ichimura, K. Ishii,
Density Fluctuation in the Tandem Mirror GAMMA 10 A. Itakura, S. Tsunoda, M. Fukuhara, H. Higaki, H. Hojo, M. Ichimura, K. Ishii, Y. Shima, H. Takiue, M. Yoshikawa, T. Cho Plasma Research Center, University
More informationBursty Transport in Tokamaks with Internal Transport Barriers
Bursty Transport in Tokamaks with Internal Transport Barriers S. Benkadda 1), O. Agullo 1), P. Beyer 1), N. Bian 1), P. H. Diamond 3), C. Figarella 1), X. Garbet 2), P. Ghendrih 2), V. Grandgirard 1),
More informationEdge and Internal Transport Barrier Formations in CHS. Identification of Zonal Flows in CHS and JIPPT-IIU
Edge and Internal Transport Barrier Formations in CHS S. Okamura, T. Minami, T. Akiyama, T. Oishi, A. Fujisawa, K. Ida, H. Iguchi, M. Isobe, S. Kado, K. Nagaoka, K. Nakamura, S. Nishimura, K. Matsuoka,
More information1) H-mode in Helical Devices. 2) Construction status and scientific objectives of the Wendelstein 7-X stellarator
Max-Planck-Institut für Plasmaphysik 1) H-mode in Helical Devices M. Hirsch 1, T. Akiyama 2, T.Estrada 3, T. Mizuuchi 4, K. Toi 2, C. Hidalgo 3 1 Max-Planck-Institut für Plasmaphysik, EURATOM-Ass., D-17489
More informationTurbulence and flow in the Large Plasma Device
Turbulence and flow in the Large Plasma Device D.A. Schaffner, T.A. Carter, P. Popovich, B. Friedman Dept of Physics, UCLA Gyrokinetics in Laboratory and Astrophysical Plasmas Isaac Newton Institute of
More informationH-mode in Helical Devices
1 EXC/2-5Ra H-mode in Helical Devices M. Hirsch 1), T. Akiyama 2), T. Estrada 3), T. Mizuuchi 4), K. Toi 2), C. Hidalgo 3) 1) Max-Planck-Institut für Plasmaphysik, EURATOM-Ass., D-17489 Greifswald, Germany
More informationProgress of Confinement Physics Study in Compact Helical System
1st IAEA Fusion Energy Conference Chengdu, China, 16-1 October, 6 IAEA-CN-149/ EX/5-5Rb Progress of Confinement Physics Study in Compact Helical System S. Okamura et al. NIFS-839 Oct. 6 1 EX/5-5Rb Progress
More informationImproved Plasma Confinement by Ion Bernstein Waves (IBWs) Interacting with Ions in JET (Joint European Torus)
Improved Plasma Confinement by Ion Bernstein Waves (IBWs) Interacting with Ions in JET (Joint European Torus) PD/P-01 C. Castaldo 1), R. Cesario 1), Y, Andrew 2), A. Cardinali 1), V. Kiptly 2), M. Mantsinen
More informationStudies of Turbulence and Transport in Alcator C- Mod H-Mode Plasmas with Phase Contrast Imaging and Comparisons with GYRO*
Studies of Turbulence and Transport in C- Mod H-Mode Plasmas with Phase Contrast Imaging and Comparisons with GYRO* M. Porkolab 1, L. Lin 1, E.M. Edlund 1, J.C. Rost 1, C.L. Fiore 1, M. Greenwald 1, Y.
More informationMeasurements of rotational transform due to noninductive toroidal current using motional Stark effect spectroscopy in the Large Helical Device
REVIEW OF SCIENTIFIC INSTRUMENTS 76, 053505 2005 Measurements of rotational transform due to noninductive toroidal current using motional Stark effect spectroscopy in the Large Helical Device K. Ida, a
More informationEFFECT OF PLASMA FLOWS ON TURBULENT TRANSPORT AND MHD STABILITY*
EFFECT OF PLASMA FLOWS ON TURBULENT TRANSPORT AND MHD STABILITY* by K.H. BURRELL Presented at the Transport Task Force Meeting Annapolis, Maryland April 3 6, 22 *Work supported by U.S. Department of Energy
More informationPlasma Diagnostics in an Applied Field MPD Thruster * #
Plasma Diagnostics in an Applied Field MPD Thruster * # G. Serianni, N. Vianello, F. Paganucci, P. Rossetti, V. Antoni, M. Bagatin, M. Andrenucci Consorzio RFX, Associazione Euratom-ENEA sulla Fusione
More informationDevelopment of a 2D full-wave JE-FDTD Maxwell X-mode code for reflectometry simulation
Development of a 2D full-wave JE-FDTD Maxwell X-mode code for reflectometry simulation F. da Silva, S. Heuraux, T. Ribeiro and B. Scott Associação EURATOM/IST Instituto de Plasmas e Fusão Instituto Superior
More informationObservation of geodesic acoustic modes (GAMs) and their radial propagation at the edge of TEXTOR tokamak
Observation of geodesic acoustic modes (GAMs) and their radial propagation at the edge of TEXTOR tokamak Y. Xu 1, I. Shesterikov 1, M. Van Schoor 1, M. Vergote 1, R. R. Weynants 1, A. Krämer-Flecken 2,
More informationThree Dimensional Measurements Of Geodesic Acoustic Mode with Correlation Doppler Reflectometers
Three Dimensional Measurements Of Geodesic Acoustic Mode with Correlation Doppler Reflectometers 1, Z.B. Shi 1,Y. Xu 1, X.L. Zou 2, X.R. Duan 1, W. Chen 1, M. Jiang 1, Z.C. Yang 3, B.Y. Zhang 1, P.W. Shi
More informationOverview of TJ-II experiments
INSTITUTE OF PHYSICS PUBLISHING and INTERNATIONAL ATOMIC ENERGY AGENCY NUCLEAR FUSION Nucl. Fusion 45 (25) S266 S275 Overview of TJ-II experiments doi:1.188/29-5515/45/1/s22 C. Hidalgo 1, C. Alejaldre
More informationParticle transport results from collisionality scans and perturbative experiments on DIII-D
1 EX/P3-26 Particle transport results from collisionality scans and perturbative experiments on DIII-D E.J. Doyle 1), L. Zeng 1), G.M. Staebler 2), T.E. Evans 2), T.C. Luce 2), G.R. McKee 3), S. Mordijck
More informationFlow, turbulence and transport in laboratory plasmas (at least in LAPD and DIII-D)
Flow, turbulence and transport in laboratory plasmas (at least in LAPD and DIII-D) T.A. Carter, D. Schaffner, B. Friedman, J. Hillesheim, W.A. Peebles, G. Rossi, M.V. Umansky 2, D. Guice, S. Vincena, J.E.
More informationUnderstanding Turbulence is a Grand Challenge
The Turbulent Structure of a Plasma Confined by a Magnetic Dipole B. A. Grierson M.W. Worstell, M.E. Mauel ICC 28 Reno, NV 1 Understanding Turbulence is a Grand Challenge Ubiquitous in natural and laboratory
More informationTurbulence Measurements with the Upgraded Phase Contrast Imaging Diagnostic in Alcator C-Mod
Turbulence Measurements with the Upgraded Phase Contrast Imaging Diagnostic in L. Lin, M. Porkolab, E. M. Edlund, Y. Lin, S. J. Wukitch Plasma Science and Fusion Center, MIT, Cambridge, MA, 02139 48 th
More information3D effects on transport and plasma control in the TJ-II stellarator
1 3D effects on transport and plasma control in the TJ-II stellarator F. Castejón 1 and the TJ-II team 1 and collaborators 2 1 Laboratorio Nacional de Fusión, CIEMAT, 28040, Madrid, Spain 2 Institute of
More informationObservations of Rotation Reversal and Fluctuation Hysteresis in Alcator C-Mod Plasmas
Observations of Rotation Reversal and Fluctuation Hysteresis in Alcator C-Mod Plasmas N.M. Cao 1, J.E. Rice 1, A.E. White 1, S.G. Baek 1, M.A. Chilenski 1, P.H. Diamond 2, A.E. Hubbard 1, J.W. Hughes 1,
More informationGA A27418 THE ROLE OF ZONAL FLOWS AND PREDATOR- PREY OSCILLATIONS IN THE FORMATION OF CORE AND EDGE TRANSPORT BARRIERS
GA A27418 THE ROLE OF ZONAL FLOWS AND PREDATOR- PREY OSCILLATIONS IN THE FORMATION OF CORE AND EDGE TRANSPORT BARRIERS by L. SCHMITZ, L. ZENG, T.L. RHODES, J.C. HILLESHEIM, W.A. PEEBLES, R.J. GROEBNER,
More informationObservation of Reduced Core Electron Temperature Fluctuations and Intermediate Wavenumber Density Fluctuations in H- and QH-mode Plasmas
Observation of Reduced Core Electron Temperature Fluctuations and Intermediate Wavenumber Density Fluctuations in H- and QH-mode Plasmas EX/P5-35 L. Schmitz 1), A.E. White 1), G. Wang 1), J.C. DeBoo 2),
More informationSupplemental material for Bound electron nonlinearity beyond the ionization threshold
Supplemental material for Bound electron nonlinearity beyond the ionization threshold 1. Experimental setup The laser used in the experiments is a λ=800 nm Ti:Sapphire amplifier producing 42 fs, 10 mj
More informationEX/C3-5Rb Relationship between particle and heat transport in JT-60U plasmas with internal transport barrier
EX/C-Rb Relationship between particle and heat transport in JT-U plasmas with internal transport barrier H. Takenaga ), S. Higashijima ), N. Oyama ), L. G. Bruskin ), Y. Koide ), S. Ide ), H. Shirai ),
More informationDensity Collapse in Improved Confinement Mode on Tohoku University Heliac
1 EX/P5-12 Density Collapse in Improved Confinement Mode on Tohoku University Heliac S. Kitajima 1), Y. Tanaka 2), H. Utoh 1), H. Umetsu 1), J. Sato 1), K. Ishii 1), T. Kobuchi 1), A. Okamoto 1), M. Sasao
More informationComparison of Ion Internal Transport Barrier Formation between Hydrogen and Helium Dominated Plasmas )
Comparison of Ion Internal Transport Barrier Formation between Hydrogen and Helium Dominated Plasmas ) Kenichi NAGAOKA 1,2), Hiromi TAKAHASHI 1,2), Kenji TANAKA 1), Masaki OSAKABE 1,2), Sadayoshi MURAKAMI
More informationThomson Scattering from Nonlinear Electron Plasma Waves
Thomson Scattering from Nonlinear Electron Plasma Waves A. DAVIES, 1 J. KATZ, 1 S. BUCHT, 1 D. HABERBERGER, 1 J. BROMAGE, 1 J. D. ZUEGEL, 1 J. D. SADLER, 2 P. A. NORREYS, 3 R. BINGHAM, 4 R. TRINES, 5 L.O.
More informationUsing a Microwave Interferometer to Measure Plasma Density Mentor: Prof. W. Gekelman. P. Pribyl (UCLA)
Using a Microwave Interferometer to Measure Plasma Density Avital Levi Mentor: Prof. W. Gekelman. P. Pribyl (UCLA) Introduction: Plasma is the fourth state of matter. It is composed of fully or partially
More informationConfigurational Effects on Stability and Confinement in the H-1NF Heliac
Configurational Effects on Stability and Confinement in the H-1NF Heliac B. D. Blackwell 1), D.G. Pretty 4), J. Howard 1), S.T.A. Kumar 5), D. Oliver 6), D. Byrne 1), J.H. Harris 7), C.A. Nuhrenberg 8),
More informationDensity and Potential Fluctuation Measurements in the Tandem Mirror GAMMA 10 Plasma
J. Plasma Fusion Res. SERIES, Vol. 8 (9) Density and Potential Fluctuation Measurements in the Tandem Mirror GAMMA Plasma Masayuki YOSHIKAWA, Yoshiaki MIYATA, Toshiaki MATSUMOTO, Masanori MIZUGUCHI, Yoshitaka
More informationOverview of the Geodesic Acoustic Mode (GAM) studies on the T-10 tokamak
Overview of the Geodesic Acoustic Mode (GAM) studies on the T-10 tokamak A.V. Melnikov 1,2, L.G. Eliseev 1, L.I. Krupnik 3, J. Chercoles 4, A.A. Chmyga 3, G. N. Dezhko 3, M.A. Drabinskij 1, P.O. Khabanov
More informationMagnetic Field Configuration Dependence of Plasma Production and Parallel Transport in a Linear Plasma Device NUMBER )
Magnetic Field Configuration Dependence of Plasma Production and Parallel Transport in a Linear Plasma Device NUMBER ) Daichi HAMADA, Atsushi OKAMOTO, Takaaki FUJITA, Hideki ARIMOTO, Katsuya SATOU and
More informationConfigurational Effects on Alfvénic modes and Confinement in the H-1NF Heliac
Configurational Effects on Alfvénic modes and Confinement in the H-1NF Heliac B. D. Blackwell 1), D.G. Pretty 4), J. Howard 1), R. Nazikian 9), S.T.A. Kumar 5), D. Oliver 6), D. Byrne 1), J.H. Harris 7),
More informationEffect of ECRH Regime on Characteristics of Short-Wave Turbulence in Plasma of the L-2M Stellarator
1 Effect of ECRH Regime on Characteristics of Short-Wave Turbulence in Plasma of the L-2M Stellarator N.N. Skvortsova, D.K. Akulina, G.M. Batanov, G.S. Voronov, L.V. Kolik, L.M. Kovrizhnykh, A.A. Letunov,
More informationStudy of Electron Heat Pulse Propagation induced by ECRH/on-off on T-10 and LHD
J. Plasma Fusion Res. SERIES, Vol. Vol. 6 6 (2004) (2004) 134 138 000 000 Study of Electron Heat Pulse Propagation induced by ECRH/on-off on T-10 and LHD NEUDATCHIN Sergey 1, INAGAKI Shigeru 1, ITOH Kimitaka
More information- Effect of Stochastic Field and Resonant Magnetic Perturbation on Global MHD Fluctuation -
15TH WORKSHOP ON MHD STABILITY CONTROL: "US-Japan Workshop on 3D Magnetic Field Effects in MHD Control" U. Wisconsin, Madison, Nov 15-17, 17, 2010 LHD experiments relevant to Tokamak MHD control - Effect
More informationLarge Plasma Device (LAPD)
Large Plasma Device (LAPD) Over 450 Access ports Computer Controlled Data Acquisition Microwave Interferometers Laser Induced Fluorescence DC Magnetic Field: 0.05-4 kg, variable on axis Highly Ionized
More informationImpact of Localized ECRH on NBI and ICRH Driven Alfven Eigenmodes in the ASDEX Upgrade Tokamak
Impact of Localized ECRH on NBI and ICRH Driven Alfven Eigenmodes in the ASDEX Upgrade Tokamak M. Garcia-Munoz M. A. Van Zeeland, S. Sharapov, Ph. Lauber, J. Ayllon, I. Classen, G. Conway, J. Ferreira,
More informationOVERVIEW OF THE ALCATOR C-MOD PROGRAM. IAEA-FEC November, 2004 Alcator Team Presented by Martin Greenwald MIT Plasma Science & Fusion Center
OVERVIEW OF THE ALCATOR C-MOD PROGRAM IAEA-FEC November, 2004 Alcator Team Presented by Martin Greenwald MIT Plasma Science & Fusion Center OUTLINE C-Mod is compact, high field, high density, high power
More informationExperiments with a Supported Dipole
Experiments with a Supported Dipole Reporting Measurements of the Interchange Instability Excited by Electron Pressure and Centrifugal Force Introduction Ben Levitt and Dmitry Maslovsky Collisionless Terrella
More informationCoexistence of the drift wave spectrum and low-frequency zonal flow potential in cylindrical laboratory plasmas
The th meeting of study on Plasma Science for Young Scientists, Mar. 7-9 28, JAEA, Naka, Ibaraki, Japan Coexistence of the drift wave spectrum and low-frequency zonal flow potential in cylindrical laboratory
More information1. The first observations of the small-scale ETG-mode drift wave turbulence performed in FT-2 research tokamak.
Correlative Enhanced Scattering in the upper hybrid resonance for study of micro and meso-scale wave phenomena in low-temperature and tokamak plasmas Evgeniy Gusakov Ioffe Institute 6 Politekhnicheskaya,
More information( ) U-probe for the COMPASS Tokamak. Introduction
WDS'11 Proceedings of Contributed Papers, Part II, 227 232, 2011. ISBN 978-80-7378-185-9 MATFYZPRESS U-probe for the COMPASS Tokamak K. Kovařík, 1,2 I. Ďuran, 1 J. Stöckel, 1 J. Seidl, 1,2 D. Šesták, 1
More informationFast Particle Physics on ASDEX Upgrade Interaction of Energetic Particles with Large and Small Scale Instabilities
1 EX/6-1 Fast Particle Physics on ASDEX Upgrade Interaction of Energetic Particles with Large and Small Scale Instabilities S. Günter 1, G. Conway 1, C. Forest 2, H.-U. Fahrbach 1, M. Garcia Muñoz 1, S.
More informationDivertor Power Handling Assessment for Baseline Scenario Operation in JET in Preparation for the ILW
EFDA JET CP(9)6/54 I. Nunes, P.J. Lomas, G. Saibene, T. Eich, G. Arnoux, H. Thomsen, E de la Luna and JET EFDA contributors Divertor Power Handling Assessment for Baseline Scenario Operation in JET in
More informationIon Heating Experiments Using Perpendicular Neutral Beam Injection in the Large Helical Device
Ion Heating Experiments Using Perpendicular Neutral Beam Injection in the Large Helical Device Kenichi NAGAOKA, Masayuki YOKOYAMA, Yasuhiko TAKEIRI, Katsumi IDA, Mikiro YOSHINUMA, Seikichi MATSUOKA 1),
More informationTransverse Coherence Properties of the LCLS X-ray Beam
LCLS-TN-06-13 Transverse Coherence Properties of the LCLS X-ray Beam S. Reiche, UCLA, Los Angeles, CA 90095, USA October 31, 2006 Abstract Self-amplifying spontaneous radiation free-electron lasers, such
More informationVariation of Turbulence and Transport with the Te/Ti Ratio in H-Mode Plasmas
Variation of Turbulence and Transport with the Te/Ti Ratio in H-Mode Plasmas by G.R. McKee with C.H. Holland, C.C. Petty, H. Reimerdes,5, T.R. Rhodes6,L. Schmitz6, S. Smith, I.U. Uzun-Kaymak, G. Wang6,
More informationRole of Low-Order Rational Surfaces in Transport Barrier Formation on the Large Helical Device
Role of Low-Order Rational Surfaces in Transport Barrier Formation on the Large Helical Device K. Toi, F. Watanabe a, K. Tanaka, T. Tokuzawa, K. Ogawa b, M. Isobe, M. Osakabe, Y. Suzuki, T. Akiyama, K.
More informationControl of Neo-classical tearing mode (NTM) in advanced scenarios
FIRST CHENGDU THEORY FESTIVAL Control of Neo-classical tearing mode (NTM) in advanced scenarios Zheng-Xiong Wang Dalian University of Technology (DLUT) Dalian, China Chengdu, China, 28 Aug, 2018 Outline
More informationPlasma turbulence measured with fast frequency swept reflectometry in JET H mode plasmas
EUROFUSION WPJET-PR(6) 583 F Clairet et al. Plasma turbulence measured with fast frequency swept reflectometry in JET H mode plasmas Preprint of Paper to be submitted for publication in Nuclear Fusion
More informationTitre: Développement d un code de réflectométrie "full-wave" 3D européen. Title: Development of a European 3D full-wave reflectometer simulation code
Titre: Développement d un code de réflectométrie "full-wave" 3D européen Title: Development of a European 3D full-wave reflectometer simulation code S. Hacquin 1, E. Blanco 2, G. D. Conway 3, S. Heuraux
More informationPlasma Fusion Center Massachusetts Institute of Technology Cambridge, MA Burrell, K.H. General Atomics PO Box San Diego, CA
PFC/JA-95-28 Edge Turbulence Measurements during the L- to H-Mode Transition by Phase Contrast Imaging on DIII-Dt Coda, S.; Porkolab, M.; Plasma Fusion Center Massachusetts Institute of Technology Cambridge,
More informationPellet injection experiments in LHD
Published by Fusion Energy Division, Oak Ridge National Laboratory Building 921-2 P.O. Box 29 Oak Ridge, TN 37831-871, USA Editor: James A. Rome Issue 68 March 2 E-Mail: jar@y12.doe.gov Phone (865) 574-136
More informationTriggering Mechanisms for Transport Barriers
Triggering Mechanisms for Transport Barriers O. Dumbrajs, J. Heikkinen 1, S. Karttunen 1, T. Kiviniemi, T. Kurki-Suonio, M. Mantsinen, K. Rantamäki 1, S. Saarelma, R. Salomaa, S. Sipilä, T. Tala 1 Euratom-TEKES
More informationOverview the CASTOR Fast Particles experiments
Overview the CASTOR Fast Particles experiments F. Zacek 1, V. Petrzilka 1, M. Goniche 2, P. Devynck 2, J. Adamek 1 1 Association Euratom/IPP.CR, Za Slovankou 3, 182 21 Prague 8, Czech Republic 2 Association
More informationBlob sizes and velocities in the Alcator C-Mod scrapeoff
P1-59 Blob sizes and velocities in the Alcator C-Mod scrapeoff layer R. Kube a,b,*, O. E. Garcia a,b, B. LaBombard b, J. L. Terry b, S. J. Zweben c a Department of Physics and Technology, University of
More informationActive Control of Alfvén Eigenmodes in the ASDEX Upgrade tokamak
Active Control of Alfvén Eigenmodes in the ASDEX Upgrade tokamak M. Garcia-Munoz, S. E. Sharapov, J. Ayllon, B. Bobkov, L. Chen, R. Coelho, M. Dunne, J. Ferreira, A. Figueiredo, M. Fitzgerald, J. Galdon-Quiroga,
More informationStudy of Coulomb collisions and magneto-ionic propagation effects on ISR measurements at Jicamarca
Study of Coulomb collisions and magneto-ionic propagation effects on ISR measurements at Jicamarca Marco A. Milla Jicamarca Radio Observatory JIREP Program Jicamarca ISR measurements perp. to B Incoherent
More informationBifurcation-Like Behavior of Electrostatic Potential in LHD )
Bifurcation-Like Behavior of Electrostatic Potential in LHD ) Akihiro SHIMIZU, Takeshi IDO, Masaki NISHIURA, Ryohei MAKINO 1), Masayuki YOKOYAMA, Hiromi TAKAHASHI, Hiroe IGAMI, Yasuo YOSHIMURA, Shin KUBO,
More informationUltra-High Spatial Resolution in Distributed Fibre Sensing
Presentation of EPFL-Group for Fibre Optics: Ultra-High Spatial Resolution in Distributed Fibre Sensing Prof. Luc THEVENAZ & co-workers 2 Postdoc, 4 PhD students, 3 visiting students 1/5 Adm. Assistant
More informationPlasma Spectroscopy in ISTTOK
Plasma Spectroscopy in ISTTOK J. Figueiredo 1, R. B. Gomes 1, T. Pereira 1, H. Fernandes 1, A. Sharakovski 2 1 Associação EURATOM/IST, Centro de Fusão Nuclear, IST, 1049-001 Lisboa, Portugal 2 Association
More informationDoppler Reflectometry Simulations for ASDEX Upgrade
Doppler Reflectometry Simulations for ASDEX Upgrade C. Lechte IGVP University of Stuttgart Pfaffenwaldring 31, 70569 Stuttgart Germany Phone +49 711 685 62306 Fax +49 711 685 63102 G. D. Conway, T. Görler,
More informationThe Li-wall Stellarator Experiment in TJ-II
The Li-wall Stellarator Experiment in TJ-II Laboratorio Nacional de Fusión. CIEMAT. Madrid. Spain Outlook Introduction Why Lithium? Li coating technique in TJ-II 2008 Results Particle recycling and confinement
More informationC-Mod Core Transport Program. Presented by Martin Greenwald C-Mod PAC Feb. 6-8, 2008 MIT Plasma Science & Fusion Center
C-Mod Core Transport Program Presented by Martin Greenwald C-Mod PAC Feb. 6-8, 2008 MIT Plasma Science & Fusion Center Practical Motivations for Transport Research Overall plasma behavior must be robustly
More informationThe role of zonal flows and predator-prey oscillations in triggering
The role of zonal flows and predator-prey oscillations in triggering the formation of edge and core transport barriers L. Schmitz, 1 L. Zeng, 1 T.L. Rhodes, 1 J.C. Hillesheim 2 W.A. Peebles, 1 R.J. Groebner,
More informationICRH Experiments on the Spherical Tokamak Globus-M
1 Experiments on the Spherical Tokamak Globus-M V.K.Gusev 1), F.V.Chernyshev 1), V.V.Dyachenko 1), Yu.V.Petrov 1), N.V.Sakharov 1), O.N.Shcherbinin 1), V.L.Vdovin 2) 1) A.F.Ioffe Physico-Technical Institute,
More informationSpontaneous tokamak rotation: observations turbulent momentum transport has to explain
Spontaneous tokamak rotation: observations turbulent momentum transport has to explain Ian H Hutchinson Plasma Science and Fusion Center and Nuclear Science and Engineering Massachusetts Institute of Technology
More informationDIAGNOSTICS FOR ADVANCED TOKAMAK RESEARCH
DIAGNOSTICS FOR ADVANCED TOKAMAK RESEARCH by K.H. Burrell Presented at High Temperature Plasma Diagnostics 2 Conference Tucson, Arizona June 19 22, 2 134 /KHB/wj ROLE OF DIAGNOSTICS IN ADVANCED TOKAMAK
More informationImproved Plasma Confinement by Ion Bernstein Waves (IBWs) Interacting with Ions in JET
EFDA JET CP(02)07/03 C. Castaldo, R. Cesario, Y, Andrew, A. Cardinali, V. Kiptly, M. Mantsinen, F. Meo, A. Murari, A. A. Tuccillo, M. Valisa, D. Van Eester, L. Bertalot, D. Bettella, C. Giroud, C. Ingesson,
More information