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 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 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 Frascati GDE Meeting BCD layout IP Working Group for BCD WG1 : LET beam dynamics WG2 : Main Linac WG3a : Sources WG3b : Damping Rings WG4 : Beam Delivery WG5 : SCRF Cavity Frascati GDE Meeting Matrix group for RDR A. Brachmann M. Kuriki J. Sheppard J. Gao S. Guiducci A. Wolski C. Adolphsen H. Hayano E.-S. Kim L. Lilje P. Tenenbaum N. Solyak D. A-K A. Seryi H. Yamamoto Area system is geographical breakdown of machine for design and cost estimation 1st Area system meeting Baseline Layout (500 GeV) - 1st stage : 500 GeV - 2nd stage : 1 TeV ; Moving of turn-around and BC No moving of DR Electron source in BCD 120 keV DC Gun laser 12 MeV 70-100 MeV NC pre-accelerator NC SHB+solenoid 400 MeV SC Linac Eacc = 17.8 MV/m diagnostic section Positron source in BCD Undulator ~100m To IP e- Accelerating structure e+ 150 GeV e- Ti Alloy Target To DR Damping Ring in BCD Baseline e+ : two 6 km rings e- : one 6 km ring Alternative e+ : 6 km, 17 km Baseline 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. 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 Baseline Damping Ring Circumference Energy RF frequency Harmonic number Damping time Emittance Bunch length Energy spread Momentum compaction Damping wiggler peak field Damping wiggler period Energy acceptance Dynamic aperture 6.6 km 5 GeV 650 MHz 14402 < 25 ms (e+) < 50 ms (e-) 5 mm 6 mm < 0.13 % 4x10-4 1.6 T 0.4 m < 0.5 % Ax+Ay < 0.09 m-rad Baseline Damping Ring Bunch filling patterns for e- Fast-ion effects in Baseline Damping Ring 650 MHz, 5400 bunch Sqrt(Jy) Beam size per 50 turns Lattice Design of Electron damping ring One straight section One Arc and Wiggler section A lattice with low average beta-functions to reduce the effects of fast-ion. Tele-conference for e- DR lattice will be at the beginning of March. 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 Ring to Main Linac (RTML) RTML Layout Anamorphic Diagram of RTML Footprint 60 Skew Correction Collimation DR Stretch Turnaround Spin Rotator Emittance BC1 BC2 Linac Launch 50 40 X Position [m] Turn around eny = 0.02 mm, 30 20 3.2 nC, sz = 6mm Total 2.5 km 10 0 SR -10 -1800 -1600 BC 1 -1400 -1200 BC 2 -1000 sz = 0.15 mm -800 -600 Z position [m] -400 -200 0 200 Ring to Main Linac (RTML) Bunch compressor Alternative Baseline Chicane 68.4 m 480 m Matching 4m 310 m Number of RF cavity 452 488 Total length 680 m 1400 m Alternative Baseline Required bunch length achieved achieved System length shorter longer Tolerence of emittance acceptable comparable BCD GDE Requirement alternative correction of vertical dispersion acceptable comparable baseline shorten system length 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 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 Beam Delivery System in BCD Baseline : - 2 IPs for 2 mrad and 20 mard - 150 m longitudinal separation between 2 IPs Alternative : - 1 IP 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.