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ILC Bunch compressor 현황과 계획

CHEP.knu.ac.kr. ILC Bunch compressor 현황과 계획. 경북대학교 고에너지물리연구소 김유종 , 손동철. Accelerator Technologies for High Luminosity at ILC. For the high Luminosity of ~10 34 cm -2 s -1 at ILC we should supply dense electron beams with low transverse emittance, short bunch length, and low energy spread .

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ILC Bunch compressor 현황과 계획

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  1. CHEP.knu.ac.kr ILC Bunch compressor현황과 계획 경북대학교 고에너지물리연구소 김유종, 손동철

  2. Accelerator Technologies for High Luminosity at ILC • For the high Luminosity of ~1034 cm-2s-1at ILCwe should supply dense electronbeams withlow transverse emittance, short bunch length, and low energy spread. • Transverse emittance is mainly determined by gun, damping ring,bunch compressor (BC),geometric wakefields in linac, and beam instabilities in damping ring, bunch compressor, and linac. • Bunch length is mainly determined bygun andbunch compressor,and energy spread can be controlled by accelerating beams to high energy. • There arefacilities togenerate and test required high quality electron beamsfor the International Linear Collider (ILC) project, such asTESLA Test Facility Phase 2 (TTF2), coming European X-ray FEL, and planned Pohang Accelerator Laboratory X-ray FEL. • We have been working on the TESLA Test Facility Phase 2 (TTF2) at DESY since 2003.

  3. TeV-Energy Superconducting Linear Accelerator Projects - TTF-2, TESLA X-ray FEL, TESLA Linear Collider Yujong Kim’s Research at DESY • New Start-to-End Simulations with 1.5 million particles on Microbunching Instability at TTF2 Bunch Compressors • Start-To-End Simulation on RF Jitter Tolerance for European XFEL Project • Experiments based Start-to-Injector Simulations for TTF2 Injector Commissioning • Working as one of Operators for TTF2 Commissioning • Taking Charge of TTF2 1st Bunch Compressor (BC2) Operation • During TTF2 Commissioning, sending 1st Beams to Dump at TTF2 Linac End • Design of Alternative Injector and Bunch Compressor (BC) for European XFEL

  4. TeV-Energy Superconducting Linear Accelerator Projects - TTF-2, TESLA X-ray FEL, TESLA Linear Collider Yujong Kim’s International Research in 2004 • Invited Contribution to Laser Heater Review Meeting for LCLS Project of SLAC, USA • Design of New Injector, Bunch Compressor, and Linac for PAL XFEL, Korea (포항가속기연구소, 제4세대 방사광가속기 설계) • Design of Bunch Compressor and Linac for SPring-8 Compact SASE Source (SCSS) of SPring-8, Japan • Invited Oral Talk on Bunch Compressor and CSR, CTF3 of CERN • Invited Oral Talk on Bunch Compressor - FEL2004 Conference, Triste, Italy • Oral Talk on Newly Proposed Bunch Compressor for ILC, 1st ILC Workshop, KEK, Japan

  5. σz =2.09 mm 339 µm 67 µm BYPASS BC2 BC3 ACC39 RF-GUN ACC1 ACC2 ACC3 ACC4 ACC5 ACC6 LOLA COLLIMATOR SEEDING UNDULATOR E = 120.9 MeV R56 = 169.9 mm σδ= 1.03% Θ= 17.5 deg E = 437.9 MeV R56 = 48.7 mm σδ= 0.57% Θ= 3.8 deg DUMP TTF2 at DESY About 70 shifts (or 560 hours) attendance at TTF2 commissioning Yujong Kim has charge of 1st bunch compressor (BC2) operation ! TTF2 RF Gun TTF2 BC2 May 2005, D. Son at TTF2-DESY, photos taken by Y. Kim

  6. Yujong Kim’s various experiences on TTF2 commissioning, start-to-end simulations, design of injector, bunch compressor, and linac for TTF2, European XFEL, SCSS, and PAL XFEL projects Bunch Compressor for ILC Project To build Bunch Compressor for ILC Project

  7. ACC5 ACC6 Oral Talk at 1st ILC Workshop, KEK, Japan Newly Proposed Bunch Compressor for ILC by Y. Kim Initial parameters E = 5.0 GeV  = 0.13% (small !) z=6.0 mm nx= 8.0 m, ny= 0.02 m 1/8.9 1/2.2 z=6.00 mm 673 m 300 m Q=3.2 nC e-beam BC1 BC2 ACC2 ACC1 ACC3 ACC4 ACC39 E = 5.689 GeV  ~ 2.4% R56 = 236 mm  = 5.3 deg E = 6.0 GeV  ~ 2.174% R56 ~ 17 mm  ~ 1.4 deg 13.3 MV/m -21.5 deg 24.8 MV/m 170.0 deg 23.4 MV/m -45 deg Damping Ring Up to main linac : ELEGANT with CSR, ISR, and geometric short-range wakefields. but without space charge Final parameters E = 6.0 GeV  = 2.173% z=300 m nx= 8.7 m, ny= 0.02 m

  8. TeV-Energy Superconducting Linear Accelerator Projects - TTF-2, TESLA X-ray FEL, TESLA Linear Collider Background Published Papers in 2004 SCI Journal Yujong Kim, T. Shintake, H. Kitamura, H. Matsumoto, and Dongchul Son Bunch Compressor for the SPring-8 compact SASE source (SCSS) project, Nuclear Instruments and Methods in Physics Research A 528 (2004) 421-426 Yujong Kim and Dongchul Son Start-To-End (S2E) simulations on microbunching instability in TESLA  Test Facility Phase 2 (TTF2) project, Nuclear Instruments and Methods in Physics Research A 528 (2004) 427-431 International Conference Yujong Kim, J. S. Oh, M. H. Cho, I. S. Ko, W. Namkung, and Dongchul Son Start-To-End (S2E) Simulation for PAL XFEL Project, Asian Particle Accelerator Conference, Gyeongju, Korea, 2004

  9. Papers in 2004 International Conference – Continued Yujong Kim, K. Flöttmann, T. Limberg, M. Dohlus, and Dongchul Son New Linac Layout for TESLA XFEL Project, Asian Particle Accelerator Conference, Gyeongju, Korea, 2004 Yujong Kim, J. S. Oh, M. H. Cho, I. S. Ko, W. Namkung, and Dongchul Son Upgrade of PLS Linac for PAL XFEL Project, European Accelerator Conference, Paris, France, 2004 Yujong Kim, K. Flöttmann, and Dongchul Son New Simulations on Microbunching Instability at TTF2, European Particle Accelerator Conference, Paris, France, 2004 Yujong Kim, K. Flöttmann, T. Limberg, M. Dohlus, and Dongchul Son Injector and Bunch Compressor for European XFEL, European Particle Accelerator Conference, Paris, France, 2004 

  10. TeV-Energy Superconducting Linear Accelerator Projects - TTF-2, TESLA X-ray FEL, TESLA Linear Collider Papers in 2004 International Conference – Continued Yujong Kim, K. Flöttmann, T. Limberg, and Dongchul Son Start-To-End (S2E) Simulations on Jitter for European XFEL Project, European Particle Accelerator Conference, Paris, France, 2004 Yujong Kim, K. Flöttmann, T. Limberg, and Dongchul Son Alternative Linac Layout for European XFEL Project, International Linear Accelerator Conference, Lübeck, Germany, 2004 Yujong Kim K. Flöttmann, T. Limberg, M. Dohlus, and Dongchul Son – Oral Bunch Compressor for XFELs against Microbunching Instability and CSR, Free Electron Laser Conference, Trieste, Italy, 2004 Yujong Kim, J. S. Oh, M. H. Cho, I. S. Ko, W. Namkung, and Dongchul Son New Start-To-End Simulations for PAL XFEL Project, Free Electron Laser Conference, Trieste, Italy, 2004

  11. Research Plan for ILC Bunch Compressor in 2005 For proper research on ILC bunch compressor, we should collaborate with following facilities or projects in 2005. SLAC LCLS Project Beam energy at BC2 ~ 4.54 GeV. This is similar to beam energy at ILC BC1 (~ 5 GeV). It will be possible to studyon effects of incoherent synchrotron radiation (ISR) and coherent synchrotron radiation (CSR) at ILC 1st bunch compressor. Coming FNAL Superconducting Module Test Facility (SMTF) Injector, superconducting module, and 3rd harmonic module (3.9 GHz) are same as those for ILC. It will be possible to studyon nonlinearity compensation in longitudinal phase space at bunch compressor. Existing BNL Source Development Laboratory DUV FEL Project Microbunching instability in bunch compressor was continuously observed at this facility.It will be possible to studyon microbunching instability in bunch compressor with respect to GUN driving laser profile. APS, LBNL, SLAC These three labs are mainly working for ILC damping ring. It will be possible to studyon impact of beam instabilities or collective effects originally coming from damping ring on bunch compressor.

  12. 고에너지물리연구소의 ILC 추진 사업 계획 • ILC 추진본부 설립 • 연구교수 1명 이상 및 postdoc 채용 예정  CHEP에서 Asian Design Team 파견 예정 • ILC Accelerator System Design 수행 (GDE에 참여) • ILC CDR에 Bunch Compressor Design 반영토록 • DESY 팀에서 한국/Asia 팀으로 • 미국 SLAC/FNAL/ANL 등과 공동 • Damping Ring 및 Bunch Compressor 관계 연구 • Polarized Electron Source / Positron Source 개발 참여 • PES: Nagoya 팀과 공동 연구 • Positron Source: DESY 팀과 공동 연구 • Detector R/D 및 Design 수행 • Silicon Tracker 분야 • Scintillator + Pb/W 등 Calorimeter 분야 • 국가 ILC 참여 계획 수립 및 국제위원회 활동 계속

  13. PAL에서의 ILC를 위한 Facility 제안 ○ 제4세대 포항방사광 가속기인 XFEL 사업과 선형가속기 사업은 비록 에너지가 다르나, 다음 주 장치 기술은 상호 공통점이 있으며, 개발 시 관련 기술 개발 및 축적, 관련 인력 양성 등에 필요한 시간, 노력, 국제 협력 용이 등의 시너지 효과가 매우 높음. 1) 전자총 (RF방식 전자총 - 공통) - LC: 편극전자빔원(전자), 양전자발생장치, 양전자편극장치 개발 필요 2) 빔압축장치 (빔의 질을 높일 수 있는 장치) - XFEL: 고조도 X선을 얻기 위하여 개발 필요 - LC: 고휘도(전자와 양전자의 빔 사이즈를 충돌 지점에서 줄여 충돌 빈도를 높임)를 얻기 위하여 개발 필요 3) 초전도체 cavity 개발 - KSTAR 사업 등으로 개발된 초전도체 생산 가공 기술을 활용하여 개발 할 수 있는 기술로 예상 - 파쇄중성자원 (Spallation Neutron Source) 및 고 출력 양성자 가속기 제작 시 필요한 초전도체 캐비티의 기술 확보로도 필요 - 향후 싱크로트론 가속기를 개발할 경우, 초전도체 자석 및 초전도체 가속 cavity 기술 확보로도 필요

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