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Summary of Technical and Collaboration Related Issues for the ILC Damping Rings

Summary of Technical and Collaboration Related Issues for the ILC Damping Rings. N. Walker (for the Project Managers) INFN Frascati 22 January 2009. INFN and Damping Rings. 2001. 2007. TESLA TDR Full cost estimate of TESLA dogbone DR (Ansaldo) EUROTeV (FP6) Programme

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Summary of Technical and Collaboration Related Issues for the ILC Damping Rings

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  1. Summary of Technical andCollaboration Related Issues for the ILC Damping Rings N. Walker(for the Project Managers) INFN Frascati 22 January 2009 Global Design Effort

  2. INFN and Damping Rings 2001 2007 • TESLA TDR • Full cost estimate of TESLA dogbone DR (Ansaldo) • EUROTeV (FP6) Programme • WP 3 Damping RingsCoordination: S. Guiducci • GDE ILC RDR • DR Area System European coordinator:S. Guiducci (A. Wolski, J. Gao) • Continued support & collaboration • DAFNE, SuperB,… TDR 2012 Global Design Effort

  3. Technical Design Phase Project • Three Project Managers • Yamamoto (SCRF) • Ross (CFS/Global) • Walker (AS) • Accelerator Systems (AS) responsible for accelerator physics design • Damping Ring is one Technical Area Group in AS • (TAG leader: A. Wolski) Global Design Effort

  4. Technical Design Phase Project • DR TAG work-package structure reflects TD phase 1 focus on Beam Test Facilities • CesrTA (e-cloud) • ATF (emittance, kickers,…) • DAFNE (e-cloud, kickers,…) • Others: e.g. KEK-B • Two additional WPs for ILC DR design work / costing • Lattice Design • Technical Systems Global Design Effort

  5. DR & BDS Beam Test Facilities ATF & ATF2 (KEK) ultra-low emittance Final Focus optics Cornell  KEK, Japan  INFN Frascati  CesrTA (Cornell) electron cloud low emittance DAfNE (INFN Frascati) kicker development electron cloud Global Design Effort

  6. GDE ILC TD Phase R&D Plan • Damping Ring: stated critical R&D: • Demonstration of electron cloud mitigation effects (CesrTA programme, 2010) • Demonstration of ultra-low emittance (KEK ATF, 2009) • Development of 5 ns rise-time injection and extraction kickers (DAFNE experiments, 2010) • Damping Ring: Cost – performance studies • 2009: within “Minimum Machine” study • Specifically 3km ring option as part of “low-power” option • Other “VALUE ENGINEERING” activities • Vacuum system design • Power supply solution / layout etc. Global Design Effort

  7. The ILC Damping Rings • Energy 5 GeV • Number of bunches: 2625 • Charge per bunch: 3.2 nC • Circumference: 6.695 km • Dtb 6 ns • Average current 0.4 A • Emittances: • Horizontal (equilibrium) 5 mm • Vertical (extracted) 2 pm • Damping time 25 ms • Injection emittance (e+) 0.09 m (Ax+Ay) Global Design Effort

  8. The ILC Damping Rings • Energy 5 GeV • Number of bunches: 2625 • Charge per bunch: 3.2 nC • Circumference: 6.695 km • Dtb 6 ns  fast kickers • Average current 0.4 A  instabilities (e-cloud) • Emittances: • Horizontal (equilibrium) 5 mm • Vertical (extracted) 2 pm  beyond SotA • Damping time 25 ms • Injection emittance (e+) 0.09 m (Ax+Ay) Global Design Effort

  9. RDR Lattice (History) 6.7km TME Global Design Effort

  10. Working Lattice (as of TILC08, March 08) 6.7 km ring sz = 9mm  6mm (better for bunch compressor) Global Design Effort

  11. Priority ILC DR R&D (risk mitigating) • Electron Cloud • Characterise e-cloud build-up • Development of e-cloud suppression techniques • Develop modelling tools • … • Demonstration of <2 pm vertical emittance • Development of low-emittance tuning techniques • Instrumentation • Alignment • … • Fast injection / extraction kickers • Fast pulser technology <5ns rise time, 10-4 stability • Reliability / availability • Other • Classical impedance-driven instabilities • Fast-ion instability • … Global Design Effort

  12. Priority ILC DR R&D (risk mitigating) • Electron Cloud • Characterise e-cloud build-up • Development of e-cloud suppression techniques • Develop modelling tools • … • Demonstration of <2 pm vertical emittance • Development of low-emittance tuning techniques • Instrumentation • Alignment • … • Fast injection / extraction kickers • Fast pulser technology <5ns rise time, 10-4 stability • Reliability / availability • Other • Classical impedance-driven instabilities • Fast-ion instability • … TD Phase priority TD Phase priority TD Phase priority Global Design Effort

  13. Program Outline TDP Phase I TDP Phase II Global Design Effort

  14. Electron Cloud: Goals • Collect data to validate the simulation codes in the parameter regime of the ILC damping rings. • We need to understand, and be able to predict, build-up of the cloud under a variety of conditions. • We need to understand, and be able to predict, beam dynamics with e-cloud in ultra-low emittance regime. • Develop effective mitigation techniques. • Mitigation methods needed for drifts, dipoles, wigglers. • Methods must be demonstrated and adverse consequences understood. Global Design Effort

  15. Critical R&D: Electron Cloud DANE KEKB CesrTA • E-Cloud Collaboration: • ANL • Cornell • FNAL • INFN/LNF • KEK • LBNL • SLAC Global Design Effort

  16. E-Cloud Studies at DANE Multibunch instability caused by electron cloud. Simulations consistent with main observations. 60 equispaced bunches Beam current 1.2 A Growth time ~ 100 turn Global Design Effort

  17. Fast Kicker R&D • The goal is to develop and demonstrate a high-reliability fast kicker that meets the ILC specifications for damping ring injection and extraction. • R&D program includes activities at SLAC, INFN/LNF and KEK. Global Design Effort

  18. Fast Injection/Extraction Kickers: LNF Fast, high-power pulsers approaching ILC DR specifications are being tested as part of DANE upgrade program. 45 kV 5 ns pulse (FID) DANE stripline kicker designs are being modified for devices to be installed for testing in ATF. Global Design Effort

  19. Low-Emittance Tuning • ILC damping rings are specified to operate with 2 pm vertical emittance. • Swiss Light Source has recently achieved 3 pm. • Low-emittance tuning program includes work at: • ATF: studies of fast ion instability, and demonstration for ILC damping rings (also critical for ATF-2); • CesrTA: motivated by studies of electron cloud in ultra-low emittance regime; • Cockcroft Institute: in support of ATF and CesrTA programs, and ILC damping rings design. • Issues include: alignment and stabilisation specifications; diagnostics and instrumentation functionality and performance; design of coupling correction system; development of effective tuning techniques... Global Design Effort

  20. Damping Rings Design and Costing (1) Tapered Vessel Pumping Port Significant progress is being made with a CAD model for the present baseline lattice. Ante-Chambered Vessel Straight Cylindrical Vessel Tapered Vessel Gate Valves Electron Vessel BPM Station (Electron) Gate Valves Positron Vessel BPM Station (Positron) Global Design Effort

  21. Damping Rings Design and Costing (2) Development of the CAD model provides essential information for: • technical systems development (vacuum, conventional facilities...); • costing and value engineering; • beam dynamics studies (low emittance tuning, e-cloud...) Vessel with antechamber for e-cloud mitigation. BPM chamber with position encoders. BPM/bellows will contribute to machine impedance. Global Design Effort

  22. “Minimum Machine” Studies Global Design Effort

  23. “Minimum Machine” Studies • Main implication for the damping rings is that the “low power” parameter set makes a 3 km circumference feasible. • Number of bunches in the ring is halved. • Average current and bunch separation remain constant. • Reducing the circumference makes it possible to contemplate also reducing the beam energy. • Maybe reduce from 5 GeV to 4.6 GeV, or 4.2 GeV. • Reduces longitudinal emittance, with benefits for the bunch compressors. • Reduces amount of wiggler, rf, magnet power, etc. • Injected beam sizes becomes larger. • Beam becomes less robust against collective effects. Global Design Effort

  24. “Minimum Machine” Studies • We have two lattices that can be used as a basis for 3 km damping ring studies... • ...one of them produced by replacing the arc cells in the present baseline lattice, with cells based on those used in SuperB. Global Design Effort

  25. Plans for TDP-I/Minimum Machine • Continue critical R&D: • electron cloud; fast kickers; low emittance tuning. • Produce technical evaluation and cost comparison of 6 km and 3 km damping ring options, by end 2009, to support possible new baseline. • Continue technical design and costing work for TDR. Global Design Effort

  26. ILC-CLIC Collaboraton • Differences in linac technologies drive damping rings to different configurations in ILC and CLIC, however... • ...there are a number of high-priority issues that are common for both projects: • electron cloud mitigation; • ultra-low emittance tuning and preservation. • A first step toward closer collaboration has already been taken, in coordinating CLIC and ILC damping rings WebEx meetings. • A joint working group on damping rings is now being established, convened by Yannis Papaphilippou and Mark Palmer. Global Design Effort

  27. Summary • Post RDR, GDE has shifted into a more formal project structure • Technical Design Phase 1 (to 2010) focused on “Risk Mitigating” R&D • Electron Cloud • Fast kicker development • 2pm emittance • DR design work focus on cost / performance optimisation • Including 3km ring option • INFN LNF has a long history of involvement/collaboration in ILC DR design work • We hope to build on this solid base in the future Global Design Effort

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