Reduction of Turbulence and Transport in the Alcator CMod Tokamak by Dilution of Deuterium Ions with Nitrogen and Neon Injection


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1 Reduction of Turbulence and Transport in the Alcator CMod Tokamak by Dilution of Deuterium Ions with Nitrogen and Neon Injection M. Porkolab, P. C. Ennever, S. G. Baek, E. M. Edlund, J. Hughes, J. E. Rice, J. C. Rost and the Alcator CMod Team, MIT PSFC; G. M. Staebler and J. Candy, General Atomics; M. L. Reinke, ORNL EPS 2017, 44 th Conference on Plasma Physics, Belfast, Northern Ireland, June 2630, 2017 Poster P5176 * Supported by US DOE awards DEFG0294ER54235 and DEFC0299ER
2 Motivation for Dilution Experiments on CMod Controlled injection of Nitrogen or Neon for improving divertor heat load performance during coreedge physics integration may have beneficial impact on core transport which mitigates (even cancels) radiative power loss from the plasma core Additional benefit of medium Zi impurity injection to machines with ITER Like Wall (ILW ) (eg, tungsten) is to control high Z impurity influx Neon is preferred for reactor (ITER) applications due to tritium inventory control (no ammonia formation as with nitrogen) How to mitigate edge pedestal pressure reduction needs further investigation (c/f JET) Seeding induced change in intrinsic rotation was seemingly unrelated to a change in electron collisionality  appears to be related to n D q 95  ion collisionality? 2
3 Background and Motivation  Recent dilution experiments in CMod were motivated by earlier experiments ( ), confirmed by TGLF modeling (Staebler and Candy) that reducing n D /n e by up to 20 % by assuming a few % Zi = 8 impurity species reduced core ion energy transport (Porkolab et al, PPCF 54, (2012))  Controlled Nitrogen seeding experiments in Alcator CMod in 2014 (Ennever, Porkolab, et al, Phys. Plasmas 22, (2015), ibid 23, (2016) ) and more recently by Neon (Porkolab et al, IAEA FEC 2016) further diluted the plasma, resulting in a reduction of ion energy transport beyond the residual values and also reduced density fluctuations (electron energy transport was changed to a lesser extent)  Reduced ion transport was correlated with reduced turbulence as measured by Phase Contrast Imaging (PCI) in the region r/a ; turbulence is absent for r/a < 0.5 due to weak gradients (but sawtoothing at r/a < 0.3)  Nonlinear GYRO simulations in regions where turbulence dominates transport agreed with experimental energy fluxes and density fluctuation measurements turbulence reduction was due either to changes in critical ion temp gradient (LOC regime) or changes in stiffness (SOC regime)  Global energy confinement did not change since improved ion energy confinement was countered by increased core radiation 3
4 Ohmic plasmas display two characteristic energy confinement regimes: Linear Ohmic Confinement (LOC) and Saturated Ohmic Confinement (SOC) Figure from P. Ennever, M. Porkolab, J. Candy, et al, Phys. Plasmas 22, (2015).  The determining parameter is n e q 95  Safety factor q 95 (B T /B p )(a/r)  At low densities, the energy confinement time is linearly related to density: linear ohmic confinement (LOC)  At high densities, the energy confinement time saturates and is independent of density: saturated ohmic confinement (SOC)  LOC and SOC plasmas also have different intrinsic rotation directions 4
5 Assuming that plasmas were diluted by a medium Z i impurity species (Z i = 8), TGLF predicted reduced ion energy transport in agreement with experiment Electron Diffusivity Ion Diffusivity Impurity Assumed to be Oxygen (Z imp =8) Ion Fraction (n D /n e ) Z eff *0.76 * *Experimental Value A similar scan assuming Z imp = 40 showed no effect of Z eff on energy transport From: Porkolab, M., et al. Plasma Physics and Controlled Fusion (2012):
6 To determine the physics of dilution, ohmic CMod plasmas were seeded with nitrogen at a range of I P and n e values while n e was held fixed in time using a cryopump  q 95 was changed by changing I p, B T = 5.4 T for all plasmas  Changing I p changed P OH, T e, T i  Seeding increased Z eff by about 1  Seeding decreased n D /n e by 1020% 6
7 Adding nitrogen decreased the concentrations of both intrinsic impurities (meaning it was more than a modification of impurity source) 7
8 Nitrogen seeding reduced the ion energy flux and increase the ion temperature gradient at r/a = 0.8, indicating a change in the turbulent energy transport q 95 = 3.9, SOC, n D /n e = 0.95 (unseeded), 0.84 (seeded) 8
9 The turbulence was measured with phase contrast imaging (PCI), an absolutely calibrated diagnostic that measures lineintegrated density fluctuations  The PCI system on CMod images density fluctuations along 32 chords onto a LN 2 cooled photoconductive HgCdTe detector  PCI signal V ñ e dl ; only sensitive to waves moving perpendicular to chords  Lineintegration means that fluctuations from the core and edge, top and bottom, are added together  Measures k R of turbulence, which is approximately k Θ in the core  Sensitive to waves with f < 1.5 MHz and 0.5 cm 1 < k R < 30 cm 1 PCI Chords 9
10 In the highcurrent (q 95 = 3.4) plasmas, a highfrequency feature of the measured PCI spectrum was reduced by nitrogen seeding 10
11 Nitrogen seeding significantly reduced high frequency (f > 150 khz) PCI spectral feature in both LOC and SOC q 95 = 3.4 cases ~ 11
12 Radially localized reflectometer channels measuring density fluctuations in the region of 0.8 r/a 0.9 showed a similar decrease in highf fluctuations to PCI 12
13 The synthetic PCI amplitude from local GYRO simulations of the q 95 = 3.4 plasmas at r/a = 0.85 agrees with the experimental PCI within uncertainties 13
14 At r/a > 0.75 the ion turbulence level is well above marginal stability, and Q i >> Q GB ; importantly, seeding with nitrogen reduced both turbulence and heat flux Reflectometer shows moderate decrease in fluctuations with seeding Reflectometer shows large decrease in fluctuations with seeding 14
15 Nitrogen seeding did not substantially affect the total plasma energy confinement time q 95 Unseeded Seeded
16 Summary of Nitrogen Seeding Experiments  Experiments on Alcator CMod demonstrated that nitrogen seeding reduced ion energy transport and density fluctuations at r/a = 0.85 where the turbulence dominates ion heat transport  Local nonlinear GYRO simulations were able to simultaneously match the turbulent energy flux and density fluctuation amplitudes  Although linear GYRO predicted reduction of ETG growth rates by dilution, nonlinear multiscale (ETG and ITGscale) simulations are unavailable at this time  Change in intrinsic rotation was related to n D q 95, seemingly unrelated to ν eff 16
17 Seeding with neon also decreased the concentrations of intrinsic impurities 17
18 Neon seeding diluted more than nitrogen seeding (larger change in Z eff ) 18
19 Both nitrogen and neon seeding substantially increased the neutron rate (T i increased by about 10%) 19
20 Change in ohmic power with seeding is negligible and cannot explain the increase in neutron rate 20
21 Neither nitrogen nor neon seeding improved global energy confinement 21
22 Effect of dilution on toroidal velocity seemed consistent between neon and nitrogen seeded discharges  both cases were dependent on n D q 95 22
23 Summary  Nitrogen and neon seeding both showed net improvement in ion transport (reduced turbulence) and fusion performance (increased neutron rate )  Overall, neon and nitrogen show similar effects on transport and turbulence:  Ion transport was reduced  Similar reduction in turbulence  Ion temperature gradients with nitrogen seeding shown to increase  Although not discussed here, similar intrinsic rotation behavior  The overall global energy confinement did not change because of increased radiation losses;  Dilution will be present in future fusion devices such as ITER, due to both helium ash buildup and extrinsic impurity seeding that will be necessary to reduce divertor heat loads 23
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