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제 2 회 국제선형충돌가속기 (ILC) Workshop

제 2 회 국제선형충돌가속기 (ILC) Workshop. 손 영욱 , 고 인수 , 남궁 원. 포항가속기연구소 , 포항공과대학교. 초전도 RF Cavity 의 기술 및 ILC 건설에 한국의 참여방안 , PAL 의 관련 연구소개. 2004. 12. 28-29 포항가속기연구소. Working Group 3: Accelerator Technology. Contents. Activities of PAL in SC RF Technology - beam dynamics

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제 2 회 국제선형충돌가속기 (ILC) Workshop

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  1. 제2회 국제선형충돌가속기(ILC) Workshop 손 영욱, 고 인수, 남궁 원 포항가속기연구소, 포항공과대학교 초전도 RF Cavity의 기술 및 ILC 건설에 한국의 참여방안, PAL의 관련 연구소개 2004. 12. 28-29 포항가속기연구소 Working Group 3: Accelerator Technology

  2. Contents • Activities of PAL in SC RF Technology - beam dynamics - cavity design - cryostat design • Technical Topics for SC RF Cavity Module • Proposal to Contribute ILC in Part of Cold Technology 1/22

  3. Activities of PAL in SC RF • 초전도 3rd Harmonic RF cavity의 feasibility study - Beam dynamics측면에서 필요성 연구o Beam emittance의 개선으로 인한 빔수명단축을 개선 o Landau damping에 의한 빔안정화 개선 • 초전도 3rd Harmonic RF cavity의 Prototype 설계- Cavity shape 선정 및 field 해석 - Prototype 공학설계 • 초전도 Cavity 제작공정 연구- 제작공정에 대한 외국사례연구 - 국내 업체의 제작능력 조사 2/22

  4. Activities of PAL in SC RF • 초전도 RF cavity 시험용 초저온 용기 설계 • 선진 연구 Group의 자문 - 일본 KEK 시설견학 (K,Saito Lab.) 및 자문 - 스위스 SLS 시설견학 및 자문 - 독일 BESSY SC cavity 설계자 자문 - 이탈리아 ELETTRA 설계자 자문 3/22

  5. Feasibility Study of SC 3H Cavity for PLS in Beam dynamics Fig. Potential well and longitudinal bunch distribution of PLS Fig. Lifetimes(□) and bunch lengths(●) with 3rd harmonic voltage 4/22

  6. PARAMETERS VALUE Material Niobium Critical magnetic field 190 mT Critical temperature 9.2 K Resistivity 1.724x10-9 m Residual resistance 1.077x10-6 Operating temperature 4.5 K Preliminary Design of SC 3HC for PLS • Frequency 1500 MHz • Cavity type Elliptical • Diameter 19.2 cm • Bore diameter 9.0 cm Table. Material Properties Fig. Cavity Geometry 5/22

  7. PARAMETERS VALUE Averaged accelerating field 4.20 MV/m Frequency 1499.99 MHz Stored energy 0.1012 Joules Power dissipation 15.88 W/cavity Quality factor 0.2403E+09 Shunt impedance 243671.03 MOhm/m Rs*Q 258.95  Z*T*T 41505.11 MOhm/m Geometry factor(r/Q) 34.54 Ohm Ratio of peak fields Bmax/Emax 3.32 mT/(MV/m) Peak-to-average ratio Emax/E0 2.84 Preliminary Design of SC 3HC for PLS Table. RF characteristics Fig. Accelerating field 6/22

  8. Port for Instruments Port for Cryogenic Devices Super-insulation 30 layers LHe Tank (Titanium) Super-insulation 50 layers Thermal Shield (30K) Thermal Shield (77K) External Vacuum Tank (sus316) SC RF Cavity (Niobium) Beam Tube (Niobium) 600 Beam Tube (Titanium) Beam Tube (SUS 316) GHe Tube LN2 Tube Port for RF Instruments Port for Vacuum Pump 1200 Conceptual Design of Cryomodule Fig. Conceptual scheme of cryomodule for SC cavity 7/22

  9. HEAT SOURCES VALUE (W) Dissipations in cavity 32 Conduction via warm flange of cryomodule 11 Conduction via feed-through of instruments 8 HOM couplers (or absorber) ? Cryogenic losses in cryogenic supply system 30 Total 81+ Conceptual Design of Cryomodule Table. Heat Loads of Cryogenic cooling system ()Total heat load depends on the scheme of HOM power removal and the piping distance between SC cavity and cold box of cryogenic system. The refrigerator, of which capacity is more than 120 Watt, is required with consideration of capacity margin 8/22

  10. TEST CRYOSTAT TEST PORT LHe TUBE GHe TUBE GN2 TUBE LN2 TUBE INSULATION PLUG He LEVEL N2 LEVEL THERMAL SHIELD (77K) INSULATING VACUUM VESSEL 2030 SUPER INSULATION 505 Cryostat for Vertical Test Prototype 3rd harmonic cavity - Nb cavity with 2 volumes - Test cryostat with multi- purpose - Cold test of SC cavity - Design study 9/22

  11. Design of Test Cryostat 10/22

  12. Technical Topics for SC RF Cavity Module • Critical magnetic field • Penetration depth, coherence length, G-L parameter, RF critical magnetic field • Thermal conductivity • RRR measurement • Surface resistance in AC application • Superconductivity of Niobium 11/22

  13. Technical Topics for SC RF Cavity Module • Cavity shape • Characteristic parameters of RF cavity • Analysis of electromagnetic fields • Engineering design • Planning fabrication and tests & measurements • Design of SC RF Cavity 12/22

  14. Technical Topics for SC RF Cavity Module • Forming (deep drawing, spinning, hydroforming) Coated cavity with Nb film • Trimming • Correcting machining error • Beam tube fabrication • Electron Beam Welding (EBW) • Bonding technology • Fabrication of SC RF Niobium Cavity 13/22

  15. Technical Topics for SC RF Cavity Module • Mechanical grinding ☞Centrifugalbarrel polishing (CBP) • Chemical polishing (CP) • Electropolishing (EP) • Heat treatment • High pressure rinsing with ultra-pure water (HPR) Ultrasonic rinsing • Assembly in clean room • Cleaning & Conditioning 14/22

  16. Technical Topics for SC RF Cavity Module • Theory of RF measurement of SC cavities • RF measurement system for vertical test; electronic devices, monitoring sys., controller, etc • Cryogenics for cooling • RF accessories; pickup/input coupler, RF generator, vacuum devices, etc • Test & Measurements in Vertical Cryostat 15/22

  17. Technical Topics for SC RF Cavity Module • Cavity disassembly after vertical test; - preventing large degradation from exposure to air - baking to recover performance - removing indium sealing • Assembly in horizontal cryostat • Final Cavity Assembly Method with Cleanness 16/22

  18. Technical Topics for SC RF Cavity Module • Design of horizontal cryostat for SC cavity modules - horizontal test cryostat - real cryostats for installation • Fabrication of horizontal cryostat • Test of cryostat performance • Assembly cryomodules with SC cavity • Design of cryo-plant • Cryogenics 17/22

  19. Advanced Technical Issues(Challenges) • High gradient SC cavity, Eacc > 45 MV/m - High pure niobium material, RRR~250 - Electropolishing (EP) - High Pressure Water Rinsing (HPR) - Baking (70~140oC) • Degradation-free final cavity assembly - Opening vacuum with argon gas - Simple aluminum vacuum sealing • Cost-effective cavity production method - Nb/Cu clad seamless cavity - Simplified surface treatment 18/22

  20. Proposal to contribute ILC in part of SC RF Cavity • Establishment of technology for high gradient accelerating field, Eacc 35 MV/m - 일본 KEK, 미국 FNAL 등에서 기술개발 주도 - 한국의 PAL, …등에서 공동참여 및 인력 training • Preliminary development of prototype cavity modules - 설계, 제작, 시험 등 KEK, FNAL 등에서 개발 주도 - 한국의 PAL, …등에서 인력지원 및 training Work Process: Superconducting RF cavity 19/22

  21. Proposal to contribute ILC in part of SC RF Cavity • Calculation & design of production cavities - KEK, FNAL 등에서 개발 주도 - 한국의 PAL, …등과 설계참여 및 training • Fabrication, cleaning & conditioning - 국내 제작을 위한 시설확보 (PAL, …, 참여기업) - 제작후 processing을 위한 시설확보 (PAL, 참여기업) - 국내 지분율에 해당하는 cavity제작 (PAL, …, 참여기업) : 9-cell cavity 약 2,000 set Work Process: Superconducting RF cavity 20/22

  22. Proposal to contribute ILC in part of SC RF Cavity • Vertical test of 9-cell cavity - Vertical test를 위한 시설확보 (PAL, …) - 9-cell cavity에 대한 상온 및 저온상태에서 시험 (PAL, …) Work Process: Superconducting RF cavity 21/22

  23. Proposal to contribute ILC in part of cold technology • Assembly of cryomodule with 9-cell cavities - 시험용 horizontal cryostat 설계, 제작 (KBSI, 참여기업) - Test facility 구축 (KBSI, 참여기업) - 양산용 cryostat 설계, 제작 (KBSI, 참여기업) - 9-cell cavity 12 set로 구성된 cryomodule 조립 • Test & measurements with horizontal cryomodule - Test & measurements (KBSI) - Data analysis (KBSI, PAL) Work Process: Cryogenics, Test & Measurement in Cryomodule 22/22

  24. 감사합니다.

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