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For Layout of ILC 20050601, 20050606 revised K.Kubo Based on following choices. Positron source:

For Layout of ILC 20050601, 20050606 revised K.Kubo Based on following choices. Positron source: Prepare both conventional and undulator based. Place the undulator at Ebeam = 150 GeV (USTOS) Damping Ring: Dogbone DR, sharing tunnel with Main Linac.

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For Layout of ILC 20050601, 20050606 revised K.Kubo Based on following choices. Positron source:

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  1. For Layout of ILC 20050601, 20050606 revised K.Kubo Based on following choices. Positron source: Prepare both conventional and undulator based. Place the undulator at Ebeam = 150 GeV (USTOS) Damping Ring: Dogbone DR, sharing tunnel with Main Linac. Avoid DR - Main Linac interference in the first stage. (Oide - scheme) Turn Around: 180 degree turn around after damping rings. This scheme allows orbit feed-forward. Two alternative plans without undulator are also shown. Layout of the interaction region can be the same as in GLC Road Map report, tentatively. Numbers with ‘?’ should be re-considered or reviewed by experts.

  2. Schematic Layout of Beam Line (Conventional and Undulator e+ source) Electron damping ring Low emittance electron transfer line Electron injector Electron main linac Collimator and final focus IPs Electron main linac for energy upgrade Positron transfer line Undulator Positron capture and accelerator Conventional positron source and injector Positron damping ring Collimator and final focus Low emittance positron transfer line IPs Positron main linac Positron main linac for energy upgrade Positron transfer line

  3. Schematic Layout and length of each part e- source e- 5GeV Linac (total 400 m) Detector halls Dump halls Turn around e- DR (Straight section 7 km) 6.1 km e- main linac (21.2 km) e- BDS (1.9 km) Spin rotator + Bunch compressor Undulator e+ source, 5 GeV Linac (total ~ 1km) e+ sourece, e+ 5 GeV Linac (total 1 km) Turn around Dump halls e+ DR (Straight section 7 km) e+ main linac (20.2 km) e+ BDS (1.9 km) Spin rotator + Bunch compressor

  4. Energy upgrade scheme No DR-ML interference in the first stage. (Oide - scheme) Electron IP e- DR Main Linac for upgrade to 1 TeV Main Linac from the beginning Positron e+ DR Main Linac for upgrade to 1 TeV Main Linac from the beginning

  5. Damping Ring geometry (similar to TESLA-TDR) 3.5 km Center point. Left side is 180 degree rotation symmetry

  6. Damping Ring Arc region by US Technical Option Study

  7. Electron Injection to Damping Ring Main Linac DR Transfer line Electron Injector Utility Tunnel Electron Damping Ring 5 GeV Electron Injector Linac + Spin Rotator (total 400 m) Electron Main Linac Positron transfer line

  8. Or, may be Main Linac DR Transfer line Electron Injector Utility Tunnel

  9. Electron Extraction from Damping Ring Electron Damping Ring Spin Rotator + Bunch Compressor (400 m?) Electron Main Linac Low emittance 5 GeV electron transfer line Positron transfer line

  10. Positron Injection to Damping Ring Electron linac + Target + capture section + Positron Injector Linac (Total 1000 m, conventional ) 5 GeV positron transfer Line (undulator base) Positron Main Linac Positron Damping Ring Main Linac DR Injector Tunnel Utility Tunnel

  11. Positron Extraction from Damping Ring Positron Damping Ring Extraction Bunch Compressor + Low Emittance 5GeV positron transfer line Positron Main Linac

  12. Turn around (same geometry as DR) Electron (mirror symmetry for positron) Main Linac start

  13. Positron production (Undulator base) (same as USTOS) Electron beam energy =150 GeV Electron Main Linac 900 m electron Chicane for positron production Low energy positron Transfer line 2.5 m Undulator region (300 m) Positron 5 GeV (may be lower) Linac (400 m) Positron production and capture (50 m?)

  14. Schematic Layout of Positron Transfer in IP region (For Undulator based positron source) (Horizontal detour) Detector Halls Main Bema lines e- e+ Low energy e+ line

  15. Or, may be (Vertical detour) Detector Halls Main Bema lines e- e+ Low energy e+ line

  16. Alternative plan -1 (No Undulator e+ source, with Oide-scheme) Low emittance electron transfer line Electron injector Collimator and final focus Electron main linac for energy upgrade IPs Electron main linac Electron damping ring Low emittance positron transfer line Conventional positron source and injector Collimator and final focus IPs Positron main linac Positron damping ring Positron main linac for energy upgrade

  17. Alternative plan -2 (No Undulator e+ source, without Oide-scheme) (Only electron line is shown. Positron line is similar.) Low emittance electron transfer line Ecm=500 GeV Collimator and final focus Electron injector Empty tunnel (free from operation) IPs Electron main linac Electron damping ring Ecm=1000 GeV Collimator and final focus Electron injector Low emittance electron transfer line IPs Electron main linac Electron damping ring

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