Experimental Studies of Electron and Gas Sources in a Heavy-Ion Beam*
|
|
- Barry Lambert
- 5 years ago
- Views:
Transcription
1 Experimental Studies of Electron and Gas Sources in a Heavy-Ion Beam* A.W. Molvik 1,2 With contributions from F.M. Bieniosek 1,3, J.J. Barnard 1,2, D.A. Calahan 2, R.H. Cohen 1,2, A. Friedman 1,2, M. Kireeff Covo 1,2, J.W. Kwan 1,3, W.R. Meier 2, L. Prost 1.3, A. Sakumi 4, P.A. Seidl 1,3, G. Westenskow 1,2, S.S. Yu 1,3, 1 HIF-VNL, 2 LLNL, 3 LBNL, 4 CERN ECLOUD04 Napa, CA April 19, 2004
2 OUTLINE Introduction to Heavy Ion Fusion (HIF) Measurements of gas desorption & electron emission Measurements of electrons in quadrupole magnets Related Papers Jean-Luc Vay, Status report on the merging of ECE code POSINST with 3-D accelerator PIC code WARP Tuesday, pm Ron Cohen, Simulations of e-cloud for Heavy-Ion Fusion Wed. am Peter Stoltz, The CMEE Lib. for numerical modeling ECE Wed. am Hong Qin, Delta-f simulations of Electron 2-stream Instab. Wed. am Molvik, ECloud04, 2
3 Target Requirements establish accelerator requirements for power plant driver 3-7 MJ x ~ 10 ns ~ 500 Terawatts Ion Range: g/cm GeV Beam charge (3-7 MJ/1-4 GeV) few mcoul 0.7 cm 1.5 cm Molvik, ECloud04, 3
4 HIF Power Plant Driver Many high-current beams needed to deliver several Mjoules to target with GeV ions A = 209amu (Bi) q= +1 L = 2.9km E = 4.0GeV I = 94.A/beam T = 0.2µs Multibeam (120) Accelerator 120 beams E = 1.6MeV I = 0.63A/beam T = 30µs 120 beams Molvik, ECloud04, 4 E = 4.0GeV I = 1.9kA/beam T = 10 ns
5 Induction Acceleration can achieve 20-50% efficiency B Efficiency increases as current increases Multiple beams within single induction core Molvik, ECloud04, 5
6 System studies show that driver cost reduced at high fill factor [fill factor may be limited by ECE or desorption] Total driver cost, $B IBEAM results: ~$1B Robust Point Design (2.8 B$) range being explored Fill factor, % (fixed number of beams, initial pulse length, and quadrupole field strength) Fill factor = a max /R pipe a max Beam Clearance a avg R pipe Beam pipe
7 HIF-ECE distinguishing features Economic mandate to maximally fill beam pipe - ions scrape wall Linac with high line charge density (Beam potential φ b > 1 kv) Induction accelerator characteristics µs - If beam head scrapes: gas desorbed (Γ 0 ~ ) and secondary e - (Γ e ~ 100) trapped by rising φ b. Control of beam head is essential. - If beam flattop scrapes: gas desorbed, SEY not necessarily trapped. - If desorbed gas reaches beam: e - from ionized gas are deeply trapped by φ b, cold ions expelled. This is expected to be main e - source in HIF, especially near injection energies ( kev/amu) where atomic cross sections peak (~10-15 cm 2 ). - Electrons are trapped for time to drift through 1 magnet, then expelled. Beam-induced multipactor not present Trailing-edge multipactor not an issue ( 0.2 s between pulses). Molvik, ECloud04, 7
8 Beam hitting gas or walls creates electrons and gas these can multiply Beam on gas, I b Beam loss to walls, I bw MeV K + Beam γ e - γ K 0 K + Beam γ n 0 e - Fe n 0 K kv potential K 2+ i + These interaction products create rich opportunities for diagnostics along with problems for diagnostics and beams Molvik, ECloud04, 8
9 HCX layout for ECE studies in magnetic quads QI-10 D2 e clearing D-end Electrodes e-suppressor (+10 kv) MA1 MA2 MA3 MA4 Slits, optical diagnostics Optical Diagnostics Electrostatic transport magnetic transport Diagnostics on insert tube Gas-Electron Source Diagnostic (GESD) ECE experiments began with diagnostics mounted on insert tubes within magnetic quads MA3 & MA4. Later experiments removed insert tubes, added electron-suppressor after MA4 and clearing electrodes between magnets. Molvik, ECloud04, 9
10 Measure electron emission Γ e and gas desorption Γ 0 from 1 MeV K + beam impact on target Gas, electron source diagnostic (GESD) Suppressor grid Ion gauge Faraday cup Beam Beam Target, angle ~2 o -15 o Reflected ion collector Tiltable target Electron Suppressor Grid & target bias varied Measure coefficient of electron Γ e and gas emission Γ 0 per incident K + ion. Calibrates beam loss from electron currents to flush wall electrodes. Evaluate mitigation techniques: baking, cleaning, surface treatment Measuring scaling of Γ 0 with ion energy test electronic sputtering model Molvik, ECloud04, 10
11 GESD secondary electron yield (SEY) varies with cos(θ) -1, secondary energy T e = 30 ev Simple model gives cos(θ) -1 - Delta electrons pulled from material by beam ions (de/dx) - Electrons from depth > δ (δ~ few nm) cannot leave surface - Ion path length in depth δ is L. L = δ /cos(θ) Results depart from this near grazing incidence where the distance for nuclear scattering is < L 1 δ θ Molvik, ECloud04, 11 L L = δ /cos(θ) 1. P. Thieberger,A. L. Hanson, D. B. Steski, et al., Phys. Rev. A 61, (2000). Coefficient of electron emission Target current (ma) SEY 6.06/cos SRIM(22A) Angle Angle from of normal incidence (deg.) T e = 30 ev Grid bias (V) Grazing incidence
12 Rough surface mitigates ion-induced electron emission, gas desorption, and ion scattering Surface roughened by glass-bead blasting (Inexpensive, but can warp surface) Angle of incidence: grazing ~60 o [from 1/cos emission] Sawtooth surface (CERN-SPS) more effective, but more expensive. Backscatter coefficient Ion backscattering - SRIM X30 (Rough) X1000 (Sawtooth) Gas desorption coef. Electron emission coef ,000 5,000 Electron emission x10 Smooth 6.06/cos Rough Angle from normal (deg) Gas desorption X2-3 Smooth Rough Angle from normal (deg.) Angle from normal (deg) Molvik, ECloud04, 12
13 Electron studies in magnetic quads Initial studies with diagnostics mounted on 5.5 cm diameter tube in quad. 180 ma full beam scraped cylindrical diag. tube - Diagnostics difficult to interpret ma apertured beam, mostly not scraping wall - Capacitive probes measure φ b (With apertured beam signals approximate expectations n e n b ) - Flush probes (right) measure secondary electron emission, from which we infer beam loss and gas desorption. Goal measure accumulation of electrons and gas - This may require diagnostics functioning with electrons / gas present. - Develop mitigation techniques to increase performance. Molvik, ECloud04, 13
14 Puzzle solved: negative spike at end-of-pulse varies with bias on BPM, caused by SEY from beam loss Joel Fajans, UC Berkeley not confinement! Halo loss and scattered ions generate secondary e - ESQ currents (capacitive pickup) match di Rogowski /dt except for burst at end of pulse [L. Prost, Ph.D thesis] QM1 electrode monitor (positive) Many e - to collector BPM B Few e - off collector Amplitude [V] Theory Data Time [µs] 0.25 QM6 electrode monitor (positive) Amplitude [V] Theory Data Loss of 0.6% of beam can produce e - pulse at tail Molvik, ECloud04, Time [µs]
15 Integrated charge to flush full-length collectors in quad magnets ok at head, but tail? Q beam λ(µcoul/m) l = Beam charge within magnet of length l Q head ( ) Q Beam Q Tail 3 x Q Beam Why? Head: can t distinguish Capac. Pickup SEY from electrode Tail: can t distinguish Capac. Pickup e - to electrode Gradual growth of negative signal: Measured Q can t exceed Q beam unless electrons supplied from outside this beam tube. Molvik, ECloud04, 15
16 Progress towards high quality beam transport electron effects only part of picture Beam split into 3, going through a 5.5 cm diam. circular bore (Imaged on scintillator, after beam passes through a slit) Slight improvement from opening bore to 6 x 10 cm elliptical bore without suppressor. 3-shots shown: still not reproducible. Electron suppression added between quad. magnets and scintillator blocks secondary electrons trifurcation an ECE Scintillator image of beam through a slit is much cleaner Quad magnetic field errors: harmonics 1%, 1mm, 1 (?) Simulations predict retuning of electrostatic and magnetic quads will eliminate beam loss. Molvik, ECloud04, 16
17 Simulations: centering beam and minimizing envelope changes reduces halo growth* Phase-II diagnostics Elliptical-quad-magnet beam tube Diagnostic tube-ii Dashed red lines from envelope code, solid from XY PIC Code PIC shows larger excursions Retuning required upstream to match into magnets. *Steven Lund, private communication Molvik, ECloud04, 17
18 New tools: suppressor ring, clearing electrodes between quads Suppressor blocks electrons from quads improves beam quality Clearing electrodes work: upstream indep. of downstream changes Measure drift velocity of e -? v v e b 2I = e = I b 014. Current (V) V(suppressor) = -10 kv Capac. (a) (b) ( c) E-6 7.0E-6 1.2E-5 Time (s) 100 Vc(a,b)=+9 kv, Vs=0 (a) (b) ( c) Capac Current (V) Suppressor V(suppressor) = Capac. (a) (b) ( c) E-6 7.0E-6 1.2E-5 Time (s) 100 Vc(a)=+9 kv, Vc( c) = 0, Vs=0 Capac. electrode: polarity varies with V s Can suppressor reduce e - to reproducible trickle? Current to clearing elec (mv) (a) (b) ( c) Bias on clearing electrode-c (kv) Current to clearing elec. (mv) (a) (b) ( c) Bias on clearing electrode-b (kv) Molvik, ECloud04, 18
19 Compare capacitive electrode (MA4) with timederivative of beam current (Faraday cup) Head Consistent with electrons 13% of beam charge. di ( b) dt Cap.-probe l CP It ( µ s) It ( ) l = ( + ) t t 2v where l CP 0.12 s (v b ) v b CP b Tail C-probe(MA4) & di/dt(fc-d2) Head CapProbe(µC) <d/dt(farcup)> Time (µs) C-electrode (µcoul) di/dt(fc) (µcoul) Fraction e ? Molvik, ECloud04, 19
20 Near-term upgrades to ECE experiments on HCX Mid-FY04: New octagonal diagnostic tubes approximate elliptical shape to pass larger beams without scraping walls study full beam without aperturing. present: 54 mm new: 79 mm Later-FY04: Addition of induction cores between magnets: can accelerate electrons in gap to energy E e > φ b. They will be lost to wall in upstream magnet. Induction core quadrupole diagnostics Support rail Molvik, ECloud04, 20
21 HIF-ECE Experimental Summary/conclusions ECE (mostly from desorption) likely to influence allowable fill factor, and therefore cost of HIF Driver for power plant. Gas desorption Γ 0 large testing electronic sputtering model Rough surface reduces emission, desorption, & scattering. Beam transport through 4 magnetic quads, with high fill factor ok. Progress in understanding diagnostic signals. Simulation plays significant role in improving performance. Electron suppressor necessary at magnet exit. Clearing electrodes remove electrons in drift region. new tools for ECE in linacs Molvik, ECloud04, 21
22 Backup material Molvik, ECloud04, 22
23 HIF-ECE distinguishing features Economic mandate to maximally fill beam pipe - ions scrape wall Linac with high line charge density (Beam potential φ b > 1 kv) Induction accelerator characteristics µs - Long (ish) pulse duration µs [Time for desorbed gas to reach beam and be ionized? But no beam-induced multipactor] - 5 Hz rep. rate [time to pump desorbed gas?] - >50% of length at injector occupied by quadrupoles, v e-drft < v e-thermal - Ionized gas e - are born trapped, e - from wall may not be trapped - Multiple beams and frequent accel gaps [Pump gaps or cold bores?] - Large neutral desorption coefficients at pipe wall (Γ o ~ ) - Injection energies near peak atomic cross-sections [ kev/amu] Heavy-ions stripping cross sections σ E -0.5, σ v E 0 ; don t win at high energy like proton accelerator where σ E -1 Molvik, ECloud04, 23
24 In search of a mechanism for gas desorption SEY = secondary emission coef. Γ 0 = Gas desorption coef. Γ 0 scales with de/dx(elec) for electronic sputtering Improved background subtraction for 300 kv_a [Compare open vs. solid green diamonds] Experiments and analysis continuing SEY KV 70 KV 140 KV 200 KV 200 KV a 300 KV 400 KV 300kV_a K+ on SS Angle from normal (deg) 1E de/dx (MeV/mg/cm2) 1E+1 1E+0 1E-1 1E-2 Nuclear Electronic Desorption coef (1000-particles) DesorpCoef 82 deg DesorpCoef 88 deg Secondary electron emission coef dE/dx_Elec SEY-82 deg SEY-88 deg 1E-3 1E-3 1E-2 1E-1 1E+0 1E+1 1E+2 1E+3 K+ energy (MeV) K+ Beam energy (kev) K+ Beam energy (kev) Molvik, ECloud04, 24
25 Current-Voltage characteristics of GESD Faraday cup and target, indicate reliable current measurements Negative Faraday cup measures beam current into GESD. Positive Faraday cup measures electrons from ionization of desorbed gas. Suppressor (-150 V) Beam Faraday cup Electron emission Use Faraday cup to measure beam current Current (ma) GESD Faraday Cup I-V Characteristic, Vs=-200 V, Vg=-150 V, Data 10/30/02. Electron emission Saturation Desorbed gas ionization Faraday cup (Target) voltage (V) Saturation of target current indicates reliable measurement of electron emission. Electron emission coefficient is ratio of electron emission current to incoming ion-beam current from Faraday cup. Molvik, ECloud04, 25
Self-consistent simulations of highintensity beams and electron-clouds.
Self-consistent simulations of highintensity beams and electron-clouds. Jean-Luc Vay Heavy Ion Fusion Science Virtual National Laboratory Lawrence Berkeley National Laboratory Many thanks to collaborators
More informationOverview of Heavy Ion Fusion Accelerator Research in the U.S. Virtual National Laboratory
Overview of Heavy Ion Fusion Accelerator Research in the U.S. Virtual National Laboratory J. J. Barnard 1, D. Baca 2, F. M. Bieniosek 2, C. M. Celata 2, R. C. Davidson 3, A. Friedman 1, D. P. Grote 1,
More informationTHE HIGH CURRENT TRANSPORT EXPERIMENT FOR HEAVY ION INERTIAL FUSION*
THE HIGH CURRENT TRANSPORT EXPERIMENT FOR HEAVY ION INERTIAL FUSION* P.A. Seidl, D. Baca, F. M. Bieniosek, C.M. Celata, A. Faltens, L. R. Prost, G. Sabbi, W. L. Waldron, Lawrence Berkeley National Laboratory,
More informationA Multi-beamlet Injector for Heavy Ion Fusion: Experiments and Modeling
A Multi-beamlet Injector for Heavy Ion Fusion: Experiments and Modeling G.A. Westenskow, D.P. Grote; LLNL J.W. Kwan, F. Bieniosek; LBNL PAC07 - FRYAB01 Albuquerque, New Mexico June 29, 2007 This work has
More informationGas desorption and electron emission from 1 MeV potassium ion bombardment of stainless steel
PHYSICAL REVIEW SPECIAL TOPICS - ACCELERATORS AND BEAMS, VOLUME 7, 093202 (2004) Gas desorption and electron emission from 1 MeV potassium ion bombardment of stainless steel Arthur W. Molvik* and Michel
More informationElectron cloud effects in intense, ion beam linacs theory and experimental planning. for heavy-ion fusion
Electron cloud effects in intense, ion beam linacs theory and experimental planning for heavy-ion fusion A. W. Molvik, Λ R. H. Cohen, y S. M. Lund, y F.M. Bieniosek, z E.P. Lee, z L.R. Prost, z P.A. Seidl,
More informationLawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory Title High current density beamlets from RF Argon source for heavy ion fusion applications Permalink https://escholarship.org/uc/item/6zh6c50m
More informationHigh current transport experiment for heavy ion inertial fusion
PHYSICAL REVIEW SPECIAL TOPICS - ACCELERATORS AND BEAMS 8, 020101 (2005) High current transport experiment for heavy ion inertial fusion L. R. Prost, P. A. Seidl, F. M. Bieniosek, C. M. Celata, A. Faltens,
More informationLawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory Title The high current transport experiment for heavy ion inertial fusion Permalink https://escholarship.org/uc/item/0kn9h80j
More informationPlans for HG Breakdown Effort at LBNL
Plans for HG Breakdown Effort at LBNL Miguel A. Furman Center for Beam Physics LBNL US Collaboration on High-Gradient Research SLAC, May 23-25, 2007 US High-Gradient Collab. Mtg. SLAC, 23-25 May 2007.
More informationPIP-II Injector Test s Low Energy Beam Transport: Commissioning and Selected Measurements
PIP-II Injector Test s Low Energy Beam Transport: Commissioning and Selected Measurements A. Shemyakin 1, M. Alvarez 1, R. Andrews 1, J.-P. Carneiro 1, A. Chen 1, R. D Arcy 2, B. Hanna 1, L. Prost 1, V.
More informationFigure 1: The current target chamber and beam diagnostic station for the NDCX-I beamline will be used during commissioning of NDCX-II in 2012
Progress in U.S. Heavy Ion Fusion Research* IAEA-10 IFE/P6-06 B G Logan, J J Barnard, F M Bieniosek, R H Cohen, R C Davidson, P C Efthimion, A Friedman, E P Gilson, L R Grisham, D P Grote, E Henestroza,
More informationMulti-Purpose Accelerator-Accumulator ITEP-TWAC for Nuclear Physics and Practical Applications
Multi-Purpose Accelerator-Accumulator ITEP-TWAC for Nuclear Physics and Practical Applications N.N.Alexeev, D.G.Koshkarev and B.Yu.Sharkov Institute for Theoretical and Experimental Physics, B.Cheremushk.
More informationIII. CesrTA Configuration and Optics for Ultra-Low Emittance David Rice Cornell Laboratory for Accelerator-Based Sciences and Education
III. CesrTA Configuration and Optics for Ultra-Low Emittance David Rice Cornell Laboratory for Accelerator-Based Sciences and Education Introduction Outline CESR Overview CESR Layout Injector Wigglers
More informationLawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory Title Summary of the ECLOUD'04 Workshop Permalink https://escholarship.org/uc/item/807017nc Authors Macek, R. Furman, M. Publication
More informationHigh-Intensity Ion Beam Neutralization and Drift Compression Experiments
1 / 37 High-Intensity Ion Beam Neutralization and Drift Compression Experiments Prabir K. Roy 1 1 Lawrence Berkeley National Laboratory (LBNL) Berkeley, CA 94720 March 08, 2010 (with S. S. Yu, P.A. Seidl,
More informationSimulations and Measurements of Secondary Electron Emission Beam Loss Monitors for LHC
Simulations and Measurements of Secondary Electron Emission Beam Loss Monitors for LHC Daniel Kramer,, Eva Barbara Holzer,, Bernd Dehning, Gianfranco Ferioli, Markus Stockner CERN AB-BI BI 4.10.2006 IPRD06,
More informationRecent Progress in the Development of a Circular Ion Induction Accelerator for Space Charge Dominated Beams at LLNL
UCRL-JC- 130606 PREPRINT Recent Progress in the Development of a Circular Ion Induction Accelerator for Space Charge Dominated Beams at LLNL L. Ahle, T. C. Sangster, D. Autrey, J. Barnard, G. Craig, A.
More informationDetailed Characterization of Vacuum Chamber Surface Properties Using Measurements of the Time Dependence of Electron Cloud Development
45th ICFA Beam Dynamic Workshop June 8 12, 2009, Cornell University, Ithaca New York Detailed Characterization of Vacuum Chamber Surface Properties Using Measurements of the Time Dependence of Electron
More informationA SIMULATION STUDY OF THE ELECTRON CLOUD IN THE EXPERIMENTAL REGIONS OF LHC
A SIMULATION STUDY OF THE ELECTRON CLOUD IN THE EXPERIMENTAL REGIONS OF LHC A. Rossi, G. Rumolo and F. Ziermann, CERN, Geneva, Switzerland Abstract The LHC experimental regions (ATLAS, ALICE, CMS and LHC
More informationThe TESLA Dogbone Damping Ring
The TESLA Dogbone Damping Ring Winfried Decking for the TESLA Collaboration April 6 th 2004 Outline The Dogbone Issues: Kicker Design Dynamic Aperture Emittance Dilution due to Stray-Fields Collective
More informationBEAM DYNAMICS ISSUES IN THE SNS LINAC
BEAM DYNAMICS ISSUES IN THE SNS LINAC A. Shishlo # on behalf of the SNS Accelerator Group, ORNL, Oak Ridge, TN 37831, U.S.A. Abstract A review of the Spallation Neutron Source (SNS) linac beam dynamics
More informationLinear Collider Collaboration Tech Notes
LCC-0124 SLAC-PUB-9814 September 2003 Linear Collider Collaboration Tech Notes Recent Electron Cloud Simulation Results for the NLC and for the TESLA Linear Colliders M. T. F. Pivi, T. O. Raubenheimer
More informationElectron Cloud Studies for KEKB and ATF KEK, May 17 May 30, 2003
Electron Cloud Studies for KEKB and ATF KEK, May 17 May 3, 23 F. Zimmermann April 12, 23 Abstract I describe a few recent electron-cloud simulations for KEKB and the ATF. For KEKB the dependence of the
More informationBeam Diagnostics Lecture 3. Measuring Complex Accelerator Parameters Uli Raich CERN AB-BI
Beam Diagnostics Lecture 3 Measuring Complex Accelerator Parameters Uli Raich CERN AB-BI Contents of lecture 3 Some examples of measurements done with the instruments explained during the last 2 lectures
More information(4) vacuum pressure & gas desorption in the IRs ( A.
Electron Cloud Effects in the LHC Frank Zimmermann,, SL/AP (1) heat load on the beam screen inside the s.c. magnets (4 20 K) (2) heat load on the cold bore (1.9 K) (3) beam instability at injection (4)
More informationElectron cloud experiments, and cures in RHIC
Electron cloud experiments, and cures in RHIC Wolfram Fischer M. Blaskiewicz, H.-C. Hseuh, H. Huang, U. Iriso, V. Ptitsyn, T. Roser, P. Thieberger, D. Trbojevic, J. Wei, S.Y. Zhang PAC 07 Albuquerque,
More informationElectron Cloud Studies
Electron Cloud Studies Tom Kroyer, Edgar Mahner,, Fritz Caspers, CERN LHC MAC, 7. December 2007 Agenda Introduction to electron cloud effects Overview over possible remedies surface coatings rough surfaces
More informationSLS at the Paul Scherrer Institute (PSI), Villigen, Switzerland
SLS at the Paul Scherrer Institute (PSI), Villigen, Switzerland Michael Böge 1 SLS Team at PSI Michael Böge 2 Layout of the SLS Linac, Transferlines Booster Storage Ring (SR) Beamlines and Insertion Devices
More informationVORPAL Simulation of E Cloud in the Fermilab Main Injector.
VORPAL Simulation of E Cloud in the Fermilab Main Injector. P. Lebrun, CD/APC, Fermilab. 1 In collaboration with John Cary1, Seth Veitzer1, Panagiotis Spentzouris2, Peter Stoltz1 2 Take home message..
More informationA 3.3 MJ, Rb +1 Driver Design Based on an Integrated Systems Analysis
Preprint UCRL-JC-137893 A 3.3 MJ, Rb +1 Driver Design Based on an Integrated Systems Analysis W.R. Meier, J.J. Barnard, R.O. Bangerter This article was submitted to 13 th International Symposium on Heavy
More informationOptimizing Beam Transport in Rapidly Compressing Beams on the Neutralized Drift Compression Experiment - II
Optimizing Beam Transport in Rapidly Compressing Beams on the Neutralized Drift Compression Experiment - II Anton D. Stepanov (University of Washington) Erik P. Gilson, Igor D. Kaganovich (Princeton Plasma
More informationChemistry Instrumental Analysis Lecture 35. Chem 4631
Chemistry 4631 Instrumental Analysis Lecture 35 Principle components: Inlet Ion source Mass analyzer Ion transducer Pumps Signal processor Mass analyzers Quadrupole Time of Flight Double Focusing Ion
More informationElectron Trapping in High-Current Ion Beam Pipes
SLAC-PUB-8367 March 2000 Electron Trapping in High-Current Ion Beam Pipes W. B. Herrmannsfeldt Contributed to 13th Internation Symposium on Heavy Ion Inertial Fusion, 3/13/2000-3/17/2000, San Diego, CA,
More informationBEAM DYNAMICS IN HEAVY ION FUSION
1996 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or
More informationUMER : The University of Maryland Electron Storage Ring
UMER : The University of Maryland Electron Storage Ring Rami A. Kishek on behalf of UMER collaboration Institute for Research in Electronics & Applied Physics University of Maryland, College Park, MD Research
More informationHigh Current Transport Experiment
HlFAN 1052 Design of a Proof of Principle High Current Transport Experiment S.M. Lurid*, R.O. Bangerter', J.J. Barnard*, C.M. Celata', A. Faltens', A. Friedman*, J.W. Kwan', E.P. Lee', and P.A. Seidl'
More informationA New Resonance for Ecloud Physics in the ILC DR Wiggler
A New Resonance for Ecloud Physics in the ILC DR Wiggler Christine Celata Dec. 18, 2007 with collaborators: Miguel Furman Jean-Luc Vay Jennifer Yu (summer student) Lawrence Berkeley National Laboratory
More informationRF BARRIER CAVITY OPTION FOR THE SNS RING BEAM POWER UPGRADE
RF BARRIER CAVITY OPTION FOR THE SNS RING BEAM POWER UPGRADE J.A. Holmes, S.M. Cousineau, V.V. Danilov, and A.P. Shishlo, SNS, ORNL, Oak Ridge, TN 37830, USA Abstract RF barrier cavities present an attractive
More informationBeam Diagnostics. Measuring Complex Accelerator Parameters Uli Raich CERN BE-BI
Beam Diagnostics Measuring Complex Accelerator Parameters Uli Raich CERN BE-BI CERN Accelerator School Prague, 2014 Contents Some examples of measurements done with the instruments explained during the
More informationHeavy ion fusion science research for high energy density physics and fusion applications*
Heavy ion fusion science research for high energy density physics and fusion applications* B G Logan 1, J J Barnard 2, F M Bieniosek 1, R H Cohen 2, J E Coleman 1, R C Davidson 3, P C Efthimion 3, A Friedman
More informationDevelopment of Large Scale Optimization Tools for Beam Tracking Codes
Development of Large Scale Optimization Tools for Beam Tracking Codes 42 nd ICFA Advanced Beam Dynamics Workshop: High-Intensity, High-Brightness Hadron Beams HB-2008, August 25-29, 2008 Nashville, Tennessee,
More informationStatus Report of the RAL Photo Detachment Beam Profile Monitor
Morschach/ Switzerland, HB 2010, 29. Sept. christoph.gabor@stfc.ac.uk slide 1 Status Report of the RAL Photo Detachment Beam Profile Monitor Christoph Gabor ASTeC, Rutherford Appleton Laboratory (G.Boorman,
More informationPlasma Traps for Space-Charge Studies : Status and Perspectives. Hiromi Okamoto (Hiroshima Univ.)
Plasma Traps for Space-Charge Studies : Status and Perspectives Hiromi Okamoto (Hiroshima Univ.) Acknowlegements Past and Present Contributors to the S-POD Project Hiroshima University Hiroyuki Higaki,
More informationPHYSICAL REVIEW SPECIAL TOPICS - ACCELERATORS AND BEAMS, VOLUME 7, (2004)
PHYSICAL REVIEW SPECIAL TOPICS - ACCELERATORS AND BEAMS, VOLUME 7, 093201 (2004) Estimates for secondary electron emission and desorption yields in grazing collisions of gold ions with beam pipes in the
More informationMeasurements and simulations of electron-cloudinduced tune shifts and emittance growth at CESRTA
Measurements and simulations of electron-cloudinduced tune shifts and emittance growth at CESRTA Stephen Poprocki, J.A. Crittenden, D.L. Rubin, S.T. Wang Cornell University ECLOUD 8 June -7, 8 Elba Island,
More informationCompressor Lattice Design for SPL Beam
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN A&B DIVISION AB-Note-27-34 BI CERN-NUFACT-Note-153 Compressor Lattice Design for SPL Beam M. Aiba Abstract A compressor ring providing very short proton
More informationBasic structure of SEM
Table of contents Basis structure of SEM SEM imaging modes Comparison of ordinary SEM and FESEM Electron behavior Electron matter interaction o Elastic interaction o Inelastic interaction o Interaction
More informationCesrTA Program Overview
CesrTA Program Overview D. Rubin, Cornell University, Ithaca, NY 14850, USA Abstract The Cornell Electron/Positron Storage Ring has been configured as a damping ring test accelerator. The principle objective
More informationSTUDY ON SPACE CHARGE COMPENSATION OF LOW ENERGY HIGH INTENSITY ION BEAM IN PEKING UNIVERSITY*
STUDY ON SPACE CHARGE COMPENSATION OF LOW ENERGY HIGH INTENSITY ION BEAM IN PEKING UNIVERSITY* S. X. Peng 1,, A. L. Zhang 1, 2, H. T. Ren 1, T. Zhang 1, J. F. Zhang 1, Y. Xu 1, J. M. Wen 1, W. B. Wu 1,
More informationIon Polarization in RHIC/eRHIC
Ion Polarization in RHIC/eRHIC M. Bai, W. MacKay, V. Ptitsyn, T. Roser, A. Zelenski Polarized Ion Sources (reporting for Anatoly Zelenski) Polarized proton beams in RHIC/eRHIC Polarized He3 for erhic (reporting
More informationP-Carbon CNI Polarimeter Operation Experience
P-Carbon CNI Polarimeter Operation Experience, A. Poblaguev, D. Steski, K. Yip, A. Zelenski Brookhaven National Laboratory, Upton, NY 11973, USA E-mail: huanghai@bnl.gov The p-carbon polarimeter working
More informationBeam Diagnostics for Low Energy Proton and H - Accelerators. Vic Scarpine Fermilab 2012 BIW April 16-19, 2012
Beam Diagnostics for Low Energy Proton and H - Accelerators Vic Scarpine Fermilab 2012 BIW April 16-19, 2012 Outline High-power proton/h- accelerator future Generic accelerator front-ends Typical diagnostic
More informationSPACE CHARGE NEUTRALIZATION AND ITS DYNAMIC EFFECTS
SPACE CHARGE NEUTRALIZATION AND ITS DYNAMIC EFFECTS Ahmed Ben Ismail, Romuald Duperrier, Didier Uriot, CEN Saclay, 99 Gif sur Yvette cedex Nicolas Pichoff, CEN Bruyères le Châtel, 9680 Bruyères le Châtel,
More informationParticle physics experiments
Particle physics experiments Particle physics experiments: collide particles to produce new particles reveal their internal structure and laws of their interactions by observing regularities, measuring
More informationExperimental Results of a LHC Type Cryogenic Vacuum System Subjected to an Electron Cloud
Experimental Results of a LHC Type Cryogenic Vacuum System Subjected to an Electron Cloud V. Baglin, B. Jenninger CERN AT-VAC, Geneva 1. Introduction LHC & Electron Cloud LHC cryogenic vacuum system 2.
More informationElectron Cloud Issues for the Advanced Photon Source Superconducting Undulator
Electron Cloud Issues for the Advanced Photon Source Superconducting Undulator Katherine Harkay Electron Cloud Workshop, Cornell, Oct. 8-12, 2010 Acknowledgements: Yury Ivanyushenkov, Robert Kustom, Elizabeth
More informationDEVELOPMENT OF LARGE SCALE OPTIMIZATION TOOLS FOR BEAM TRACKING CODES*
Proceedings of Hadron Beam 8, Nashville, Tennessee, USA DEVELOPMENT OF LARGE SCALE OPTIMIZATION TOOLS FOR BEAM TRACKING CODES* B. Mustapha # and P. N. Ostroumov Argonne National Laboratory, 97 S. Cass
More informationThe MAX IV Thermionic preinjector
The MAX IV Thermionic preinjector David Olsson ESLS RF, Lund, 2015-09-30 Injection Requirements I Full-energy injection from the LINAC 1.5 GeV and 3 GeV extraction points. Both storage rings will be operated
More informationElectron Cloud Modeling for CesrTA
Electron Cloud Modeling for CesrTA Daniel Carmody Physics Department, Carnegie Mellon University, Pittsburgh, PA, 15213 (Dated: August 10, 2007) Plans for the conversion of the Cornell Electron Storage
More information1 AT/P5-05. Institute of Applied Physics, National Academy of Sciences of Ukraine, Sumy, Ukraine
1 AT/P5-05 H - Ion Source with Inverse Gas Magnetron Geometry for SNS Project V.A. Baturin, P.A. Litvinov, S.A. Pustovoitov, A.Yu. Karpenko Institute of Applied Physics, National Academy of Sciences of
More informationSection 4 : Accelerators
Section 4 : Accelerators In addition to their critical role in the evolution of nuclear science, nuclear particle accelerators have become an essential tool in both industry and medicine. Table 4.1 summarizes
More informationShort Introduction to CLIC and CTF3, Technologies for Future Linear Colliders
Short Introduction to CLIC and CTF3, Technologies for Future Linear Colliders Explanation of the Basic Principles and Goals Visit to the CTF3 Installation Roger Ruber Collider History p p hadron collider
More informationHuashun Zhang. Ion Sources. With 187 Figures and 26 Tables Э SCIENCE PRESS. Springer
Huashun Zhang Ion Sources With 187 Figures and 26 Tables Э SCIENCE PRESS Springer XI Contents 1 INTRODUCTION 1 1.1 Major Applications and Requirements 1 1.2 Performances and Research Subjects 1 1.3 Historical
More informationEngines of Discovery
Engines of Discovery R.S. Orr Department of Physics University of Toronto Berkley 1930 1 MeV Geneva 20089 14 TeV Birth of Particle Physics and Accelerators 1909 Geiger/Marsden MeV a backscattering - Manchester
More informationA Low Energy Beam Transport Design with high SCC for TAC Proton Accelerator
A Low Energy Beam Transport Design with high SCC for TAC Proton Accelerator * A. Caliskan 1, H. F. Kisoglu 2, S. Sultansoy 3,4, M. Yilmaz 5 1 Department of Engineering Physics, Gumushane University, Gumushane,
More informationGTF Transverse and Longitudinal Emittance Data Analysis Technique * J.F. Schmerge, J.E. Clendenin, D.H. Dowell and S.M. Gierman
LCLS-TN-5-19 July 5 GTF Transverse and Longitudinal Emittance Data Analysis Technique * J.F. Schmerge, J.E. Clendenin, D.H. Dowell and S.M. Gierman Abstract The SSRL Gun Test Facility (GTF) was built to
More informationCEPC Linac Injector. HEP Jan, Cai Meng, Guoxi Pei, Jingru Zhang, Xiaoping Li, Dou Wang, Shilun Pei, Jie Gao, Yunlong Chi
HKUST Jockey Club Institute for Advanced Study CEPC Linac Injector HEP218 22 Jan, 218 Cai Meng, Guoxi Pei, Jingru Zhang, Xiaoping Li, Dou Wang, Shilun Pei, Jie Gao, Yunlong Chi Institute of High Energy
More information1.5-GeV FFAG Accelerator as Injector to the BNL-AGS
1.5-GeV FFAG Accelerator as Injector to the BNL-AGS Alessandro G. Ruggiero M. Blaskiewicz,, T. Roser, D. Trbojevic,, N. Tsoupas,, W. Zhang Oral Contribution to EPAC 04. July 5-9, 5 2004 Present BNL - AGS
More informationDiagnostics for a 1.2 ka, 1 MeV, Electron Induction Injector
Diagnostics for a 1. ka, 1 MeV, Electron Induction Injector T. L. Houck, * D. E. Anderson, S. Eylon, E. Henestroza, S. M. Lidia, D. L. Vanecek, G. A. Westenskow *, and S. S. Yu * Lawrence Livermore National
More informationThe CIS project and the design of other low energy proton synchrotrons
The CIS project and the design of other low energy proton synchrotrons 1. Introduction 2. The CIS project 3. Possible CMS 4. Conclusion S.Y. Lee IU Ref. X. Kang, Ph.D. thesis, Indiana University (1998).
More informationVacuum and mechanical design of ILC DR
Vacuum and mechanical design of ILC DR O. B. Malyshev ASTeC Vacuum Science Group, STFC Daresbury Laboratory, UK Low Emittance Ring Workshop 2010 12-15 January 2010 Integration design: usual consideration
More informationElectron Beam Polarimetry at JLab Hall C Dave Gaskell PST 2009 September 7, 2009
Electron Beam Polarimetry at JLab Hall C Dave Gaskell PST 2009 September 7, 2009 1. Møller Polarimeter 2. Compton Polarimeter 3. Summary JLab Polarimetry Techniques Three different processes used to measure
More informationMøller Polarimetry on Atomic Hydrogen
E.Chudakov June 21, 2011 Møller Polarimetry on Atomic Hydrogen 1 Møller Polarimetry on Atomic Hydrogen E.Chudakov 1 1 JLab Meeting at UVA Outline E.Chudakov June 21, 2011 Møller Polarimetry on Atomic Hydrogen
More informationBeam Shape and Halo Monitor Study
EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH CERN A&B DEPARTMENT AB-Note-2006-047 ABP Beam Shape and Halo Monitor Study J-B. Lallement, E.Z. Sargsyan, M. Hori Abstract The Beam Shape and Halo Monitor, designed
More informationCESRTA Preliminary Recommendations for the ILC Damping Rings
CESRTA Preliminary Recommendations for the ILC Damping Rings Mark Palmer Disclaimer This talk represents what is essentially the first pass (of several which are anticipated) at taking the results from
More informationLattice Design and Performance for PEP-X Light Source
Lattice Design and Performance for PEP-X Light Source Yuri Nosochkov SLAC National Accelerator Laboratory With contributions by M-H. Wang, Y. Cai, X. Huang, K. Bane 48th ICFA Advanced Beam Dynamics Workshop
More informationThomX Machine Advisory Committee. (LAL Orsay, March ) Ring Beam Dynamics
ThomX Machine Advisory Committee (LAL Orsay, March 20-21 2017) Ring Beam Dynamics A. Loulergue, M. Biagini, C. Bruni, I. Chaikovska I. Debrot, N. Delerue, A. Gamelin, H. Guler, J. Zang Programme Investissements
More informationEEE4106Z Radiation Interactions & Detection
EEE4106Z Radiation Interactions & Detection 2. Radiation Detection Dr. Steve Peterson 5.14 RW James Department of Physics University of Cape Town steve.peterson@uct.ac.za May 06, 2015 EEE4106Z :: Radiation
More informationBeam dynamics studies of H-beam chopping in a LEBT for project X
Beam dynamics studies of H-beam chopping in a LEBT for project X Qing Ji, David Grote, John Staples, Thomas Schenkel, Andrew Lambert, and Derun Li Lawrence Berkeley National Laboratory, 1 Cyclotron Road,
More informationarxiv:physics/ v1 [physics.plasm-ph] 5 Nov 2004
Ion Resonance Instability in the ELTRAP electron plasma G. Bettega, 1 F. Cavaliere, 2 M. Cavenago, 3 A. Illiberi, 1 R. Pozzoli, 1 and M. Romé 1 1 INFM Milano Università, INFN Sezione di Milano, Dipartimento
More informationCommissioning of the SNS Beam Instrumentation
Commissioning of the SNS Beam Instrumentation Commissioning of the SNS Beam Instrumentation Tom Shea for the SNS Diagnostics Team Oak Ridge National Laboratory (ORNL), Oak Ridge, TN, USA The Spallation
More informationPARTICLE ACCELERATORS
VISUAL PHYSICS ONLINE PARTICLE ACCELERATORS Particle accelerators are used to accelerate elementary particles to very high energies for: Production of radioisotopes Probing the structure of matter There
More information1.1 Electron-Cloud Effects in the LHC
11 1.1 Electron-Cloud Effects in the LHC F. Zimmermann, E. Benedetto 1 mail to: frank.zimmermann@cern.ch CERN, AB Department, ABP Group 1211 Geneva 23, Switzerland 1.1.1 Introduction The LHC is the first
More informationphotoemission, secondary emission, magnetic
Electron-Cloud Simulations: Build Up and Related Effects Frank Zimmermann, G. Rumolo,, SL/AP (1) Simulation model photoemission, secondary emission, magnetic fields, beam fields, image charges, space charge
More informationPossible Remedies to Suppress electron cloud in ILC damping ring
Possible Remedies to Suppress electron cloud in ILC damping ring L. WANG SLAC Vancouver Linear Collider Workshop 19-22 July 26 Objective Completely clear the E-cloud along the whole ring, include drift
More informationDense plasma formation on the surface of a ferroelectric cathode
Vacuum ] (]]]]) ]]] ]]] www.elsevier.com/locate/vacuum Dense plasma formation on the surface of a ferroelectric cathode K. Chirko, Ya.E. Krasik, A. Sayapin, J. Felsteiner Physics Department, Technion Israel
More informationLHC Luminosity and Energy Upgrade
LHC Luminosity and Energy Upgrade Walter Scandale CERN Accelerator Technology department EPAC 06 27 June 2006 We acknowledge the support of the European Community-Research Infrastructure Activity under
More information2.6 Electron transport lines
2.6 Electron transport lines 2.6 Electron transport lines Overview The electron transport lines consist of all of the electron beamline segments that are neither part of the Linacs nor part of the injector.
More informationOptimization of the SIS100 Lattice and a Dedicated Collimation System for Ionisation Losses
Optimization of the SIS100 Lattice and a Dedicated Collimation System for Ionisation Losses P. Spiller, K. Blasche, B. Franczak, J. Stadlmann, and C. Omet GSI Darmstadt, D-64291 Darmstadt, Germany Abstract:
More informationTEST MEASUREMENTS WITH THE REX-ISOLDE LINAC STRUCTURES*
TEST MEASUREMENTS WITH THE REX-ISOLDE LINAC STRUCTURES* O. Kester, D. Habs, T. Sieber, S. Emhofer, K. Rudolph, LMU München, Garching Germany R. von Hahn, H. Podlech, R. Repnow, D. Schwalm, MPI- K, Heidelberg,
More informationTAMU-TRAP facility for Weak Interaction Physics. P.D. Shidling Cyclotron Institute, Texas A&M University
TAMU-TRAP facility for Weak Interaction Physics P.D. Shidling Cyclotron Institute, Texas A&M University Outline of the talk Low energy test of Standard Model T =2 Superallowed transition Facility T-REX
More informationUC Berkeley UC Berkeley Previously Published Works
UC Berkeley UC Berkeley Previously Published Works Title Accessing Defect Dynamics using Intense, Nanosecond Pulsed Ion Beams Permalink https://escholarship.org/uc/item/4jx927qh Authors Persaud, A Barnard,
More informationBeam Diagnostics and Instrumentation JUAS, Archamps Peter Forck Gesellschaft für Schwerionenforschnung (GSI)
Beam Diagnostics and Instrumentation JUAS, Archamps Peter Forck Gesellschaft für Schwerionenforschnung (GSI), 2003, A dedicated proton accelerator for 1p-physics at the future GSI Demands facilities for
More informationChapiter VII: Ionization chamber
Chapiter VII: Ionization chamber 1 Types of ionization chambers Sensitive volume: gas (most often air direct measurement of exposure) ionization chamber Sensitive volume: semiconductor (silicon, germanium,
More informationBeam Dynamics in Heavy Ion Fusion
LBL-36541 UC-414 Beam Dynamics in Heavy Ion Fusion Peter Seidl Accelerator and Fusion Research Division Lawrence Berkeley Laboratory University of California Berkeley, California 94720 April 1995 This
More informationReview of ISOL-type Radioactive Beam Facilities
Review of ISOL-type Radioactive Beam Facilities, CERN Map of the nuclear landscape Outline The ISOL technique History and Geography Isotope Separation On-Line Existing facilities First generation facilities
More informationThe Booster has three magnet systems for extraction: Kicker Ke, comprising two identical magnets and power supplies Septum Se
3.2.7 Booster Injection and Extraction 3.2.7.1 Overview The Booster has two magnet systems for injection: Septum Si Kicker Ki The Booster has three magnet systems for extraction: Kicker Ke, comprising
More informationMulticusp Sources for Ion Beam Lithography Applications
LBL-3 6645 UC-406 Multicusp Sources for Ion Beam Lithography Applications K.N. Leung, P. H e n, W.B. Kunkel, Y. Lee, L. Perkins, D. Pickard, M. Sarstedt, M. Weber, and M.D. Williams Accelerator and Fusion
More informationProgress of experimental study on negative ion production and extraction
1 FIP/1-4 Progress of experimental study on negative ion production and extraction M. Kisaki 1, K. Tsumori 1,2,. Geng 2, K. Ikeda 1, H. akano 1,2, M. Osakabe 1,2, K. agaoka 1, Y. Takeiri 1,2 1 ational
More information