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Status and Plan of GDE Design Work (Including Road Map for RDR)

Status and Plan of GDE Design Work (Including Road Map for RDR). Feb. 17 2006 PAL Eun-San Kim. ILC Meetings. Snowmass, Colorado, 14-17 Aug. 2005 : Started BCD European GDE meeting, Oxford, 25 Oct. 2005 Damping ring workshop, CERN, 9-11 Nov. 2005

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Status and Plan of GDE Design Work (Including Road Map for RDR)

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  1. Status and Plan of GDE Design Work (Including Road Map for RDR) Feb. 17 2006 PAL Eun-San Kim

  2. ILC Meetings • Snowmass, Colorado, 14-17 Aug. 2005 : Started BCD • European GDE meeting, Oxford, 25 Oct. 2005 • Damping ring workshop, CERN, 9-11 Nov. 2005 • GDE meeting, Frascati, Italy 7-9 Dec. 2005 : Decided BCD • 1st Area System meeting, KEK, 19-20 Jan. 2006 : Discussed machine layout and boundary between area systems • Lattice design meeting, CERN, 6-8 Feb. 2006 • 2nd Area System meeting, FNAL, 13-14 Feb. 2006 • GDE meeting, Bangalore, 9-11 March 2006 • 3rd Area system meeting, DESY, April 2006 • GDE meeting, Vancouver, 19-23 July 2006 • GDE meeting, Valencia, Autumn 2006

  3. Frascati GDE Meeting Discussed progress since Snowmass Finally agreed BCD to be documented. - includes baseline and alternative designs Organized the GDE group for RDR in 2006 Final BCD becomes property of CCB in early 2006

  4. Frascati GDE MeetingBCD layout IP • Working Group for BCD WG1 : LET beam dynamics WG2 : Main Linac WG3a : Sources WG3b : Damping Rings WG4 : Beam Delivery WG5 : SCRF Cavity

  5. Frascati GDE Meeting Matrix group for RDR C. Adolphsen H. Hayano L. Lilje N. Solyak J. Gao S. Guiducci A. Wolski D. A-K A. Seryi H. Yamamoto M. Kuriki J. Sheppard E.-S. Kim P. Tenenbaum A. Brachmann Area system is geographical breakdown of machine for design and cost estimation

  6. 1st Area system meetingBaseline Layout (500 GeV) - 1st stage : 500 GeV - 2nd stage : 1 TeV ; Moving of turn-around and BC No moving of DR

  7. Electron source in BCD 120 keV DC Gun 70-100 MeV 12 MeV laser 400 MeV SC Linac Eacc = 17.8 MV/m NC pre-accelerator diagnostic section NC SHB+solenoid

  8. Positron source in BCD To IP Undulator ~100m e- Accelerating structure e+ To DR 150 GeV e- Ti Alloy Target

  9. Damping Ring in BCD • Baseline e+ : two 6 km rings e- : one 6 km ring • Alternative e+ : 6 km, 17 km Baseline

  10. DR Tasks List for RDR • Lattice design - 6 km e-/e+ rings : L. Emery, A. Xiao, E-S Kim, Y. Sun - 17 km e-/e+ rings : Y. Cai, Y. Yan - Injection and extraction lines : A. Wolski • Acceptance: Y. Cai, Y. Yan, A.Wolski • Low-emittance tuning: J. Jones • Impedance : M. Venturini, K. Bane, S. Heifets, etc • Electron-cloud : M. Pivi, C. Celata, K. Ohmi etc.

  11. DR Tasks List for RDR • Ion-effects : L. Wang, E-S Kim, K. Ohmi, M. Venturini, G. Xia • Other collective effects : S. Mtingwa, M. Venturini, S. Santis, A. Wolski • Injection/extraction kickers : pulser : J. Urakawa, T. Naito, M. Ross, A. Krasnykh, etc • Injection/extraction kickers : striplines : A. Krasnykh, S. Santis, D. Alesini, F. Marcellini

  12. Baseline Damping Ring Circumference 6.6 km Energy 5 GeV RF frequency 650 MHz Harmonic number 14402 Damping time < 25 ms (e+) < 50 ms (e-) Emittance 5 mm Bunch length 6 mm Energy spread < 0.13 % Momentum compaction 4x10-4 Damping wiggler peak field 1.6 T Damping wiggler period 0.4 m Energy acceptance < 0.5 % Dynamic aperture Ax+Ay < 0.09 m-rad

  13. Baseline Damping Ring Bunch filling patterns for e-

  14. Fast-ion effects in Baseline Damping Ring 650 MHz, 5400 bunch Beam size per 50 turns Sqrt(Jy)

  15. Lattice Design of Electron damping ring One straight section One Arc and Wiggler section A lattice with low average beta-functionsto reduce the effects of fast-ion. Tele-conference for e- DR lattice will be at the beginning of March.

  16. Ring to Main Linac (RTML) Status and Plans • Started works for shorter bunch compressor and turn-around optics • Contacted leaders of all technical and global systems • Milestone - Review RTML design and place lattices and documentation under change control in April 2006

  17. Ring to Main Linac (RTML) RTML Layout Turn around eny = 0.02 mm, 3.2 nC, sz = 6mm Total 2.5 km sz= 0.15 mm SR BC 1 BC 2

  18. Ring to Main Linac (RTML) Bunch compressor

  19. Ring to Main Linac (RTML) Bunch compressor • Each BC in baseline has 240 meters of bend magnets arranged in chicanes : Long ! • Considering two approaches to reduce length • Enhancing R56 by forcing nonzero dispersion at Qs • Replacing wiggler with 4-bend chicane with optimized lattice functions for emittance preservation

  20. Main Linac in BCD • Baseline in 1st stage - TESLA cavity type - Operation gradient = 31.5 MV/m, Qo=1010 • Baseline in 2nd stage - LL or RE cavity type - Operation gradient = 36 MV/m, Qo=1010 - Total length = 41 km • Alternative in 1st stage - LL or RE cavity type - Operation gradient = 36 MV/m • Linac RF basic unit -1 modulator, 1 klystron, 3 cryomodules, 27 cavities

  21. Beam Delivery System in BCD • Baseline : • - 2 IPs for 2 mrad and 20 mard • - 150 m longitudinal separation between 2 IPs • Alternative : • - 1 IP

  22. Summary • Bangalore GDE meeting - starting for estimation of costs • RDR will be finished in Dec. 2006 - RDR is not complete technical design, but is a design to estimate reliable cost. • TDR will be completed in Dec. 2008.

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