Progress and Plans for R&D and the Conceptual Design of the ILC Main Linacs H. Hayano, KEK PAC2005 5/18/2005

2 Discussions 1. ILC Main Linac configuration. gradient possible RF unit 2. Test Facilities for Main Linac RF unit. TTF at DESY SMTF at FNAL STF at KEK 1. ILC Main Linac configuration. gradient possible RF unit 2. Test Facilities for Main Linac RF unit. TTF at DESY SMTF at FNAL STF at KEK

3 Suggested ILC Beam Parameter In choosing gradient, current, followings are assumed MW klystron. 15% overhead for feedback, 6% for WG loss. 2. Cryomodule with 8, 10 or 12 cavities. 3. Bunch spacing : sub-harmonic of 1.3GHz. 4. Keep injector unchanged for 1TeV upgrade, for average current, emittances. In choosing gradient, current, followings are assumed MW klystron. 15% overhead for feedback, 6% for WG loss. 2. Cryomodule with 8, 10 or 12 cavities. 3. Bunch spacing : sub-harmonic of 1.3GHz. 4. Keep injector unchanged for 1TeV upgrade, for average current, emittances. Tor Raubenheimer

4 Possible example of gradient 1. 40MV/m, 16 cavities(8+8), 11.8mA, 352 buckets spacing MV/m, 20 cavities(10+10), 10.4mA, 384 buckets spacing MV/m, 24 cavities(12+12, 8+8+8), 10.8mA, 400 buckets spacing MV/m, 16 cavities(8+8), 11.8mA, 352 buckets spacing MV/m, 20 cavities(10+10), 10.4mA, 384 buckets spacing MV/m, 24 cavities(12+12, 8+8+8), 10.8mA, 400 buckets spacing.

5 Main Linac Unit. 1. Choice of nominal gradient. based on TTF experience, total project cost, Linac length. --> 35MV/m (use of EP) 1. Choice of nominal gradient. based on TTF experience, total project cost, Linac length. --> 35MV/m (use of EP) *  ~ 1.5 coupling for more bandwidth.

6 Main Linac Unit. Cont. 2. Choice of optics. based on Kubo’s simulation --> Q-magnet in every two modules up to 125GeV (weak focus) 2. Choice of optics. based on Kubo’s simulation --> Q-magnet in every two modules up to 125GeV (weak focus) 3. Choice of BPM. 1µm resolution, 20µm misalignment to Q. --> use of 1.5GHz cavity BPM attached to Q-magnet Quad misalign 300µm Q-BPM offset 20µm Quad misalign 300µm Cavity misalign 300µm Q-BPM offset 20µm

7 Proposed Main Linac Parameters Total number of production Cavity Cryomodule 1424 Klystron 712 Modulator 712

Proposed Main Linac RF unit (low energy part) Proposed Main Linac RF unit (low energy part)

Baseline technology of RF unit Alternative technology of RF unit 10MW Multi-beam klystron, 1:12 Pulse trans, HV cable, Bouncer Modulator, Linear distribution WG, Circulator for each input, TTF style cryomodule (but 10 cavities), TESLA style 9-cell cavity, Digital control LLRF, …. PPM-MB klystron, Sheet-beam klystron, IGBT Modulator, No circulator WG, Super-structure cavity, LL-type 9-cell cavity, Seamless cavity, ….

ILC Test Facilities in each Region TTF: leading facility & XFEL production basis. SMTF: US SC-technology integration. STF: KEK SC-technology integration. TTF: leading facility & XFEL production basis. SMTF: US SC-technology integration. STF: KEK SC-technology integration. Purpose & Role To have an ability of SC-RF technology Integration into ILC cryomodule & RF unit, To promote regional industry and laboratories, For production share by three region.

TTF -- TESLA Test Facility TESLA like beam by RF gun. Average 25MV/m. 5 accelerating module(2004) + 35MV/m #6 module(2006) 50µm by bunch compressor ACC 2 & ACC 3 ACC 4 & ACC 5 TTF Linac TTF

TTF2 VUV-FEL accelerator TTF2 commissioning Aug Saturation nmJuly 2005 Operation with full beam current Dec rd Harmonic RF & ACC6 installFeb GeV beam energyApril 2006 Saturation 6 nmJune 2006 TTF2 commissioning Aug Saturation nmJuly 2005 Operation with full beam current Dec rd Harmonic RF & ACC6 installFeb GeV beam energyApril 2006 Saturation 6 nmJune nm SASE FEL February, 2005

TTF for LC & Euro-XFEL TTF2 tunnel for realization of TESLA-LC European XFEL 20 GeV Main Linac 1.5 km length 29 klystrons 116 cryomodules 928 cavities

Cryomodule Test Plan for Euro-XFEL Test Hall 2009 ~ Cryo-Module Test Bench : 2005 ~ Fabrication by industry Assemble & Test at DESY

SMTF -- Superconducting Module & Test Facility Assembly Facility Beam Test Area FNAL Meson Area

SMTF -- Superconducting & Module Test Facility 1 cryomodule 2 cryomodules 4 cryomodules Cavity: by Industry Process, Dressed, and Tested: by collab. Lab./Univ. /Industry Assemble & Test at SMTF

STF -- Superconducting RF Test Facility ATF STF Phase 1: 1 connected module (4 cavities + 4 cavities) Phase 2: 1 ILC RF unit ( 2 modules, 20 cavities) Maximum use of existing infrastructure J-PARC test facility --> STF

STF Phase 1 cryomodule : 5m + 5m connected. Beam test setup of STF Phase 1 Cryomodule cut view Cryostat cross-section 4 TESLA-type cavities 4 LL-type cavities

Milestone of STF Phase 1 & 2 Phase 1: cool-down Oct beam on Dec Phase 2: cool-down July 2008 beam on Oct. 2008

Modules in Test Facilities TTF: total 7 modules, 8 cavities each. [XFEL : 116 modules, 8 cavities each(plan) ] SMTF: total 4 modules, 8 cavities each(plan). STF: total 3 modules, 8 cavities each for phase 1, 10 cavities each for phase 2(plan). TTF: total 7 modules, 8 cavities each. [XFEL : 116 modules, 8 cavities each(plan) ] SMTF: total 4 modules, 8 cavities each(plan). STF: total 3 modules, 8 cavities each for phase 1, 10 cavities each for phase 2(plan).

Long-term Visions of ILC and Test Facilities

end The figures and pictures are borrowed from the following web-site: DESY, FNAL, workshop presentations and conference papers. I would like to appreciate to all of presenter. Success of ILC!