1. BCD input from WG2 WG2 12/08/2005 H. Hayano Chris Adolphsen Terry Garvey Hitoshi Hayano

2. Summary of BCD input WG2 R&D activities: EU: TTF(XFEL) US: SMTF,SLAC R&D Asia: STF --> will be summarized by regional directors

3. WG2: Main Linac

4. Modulator Klystron Cavity package Gradient Cryomodule configuration RF distribution Cryogenics Tunnel curvature Tunnel layout By WG5 Revisited by BCD task force

5. Modulator

6. Baseline Alternatives Bouncer-compensated pulse transformer modulator Marx-style generator, DTI (Direct switch), DC-to-DC converter

7. Klystron

8. Baseline Alternatives 10MW multi-beam klystron 10MW sheet beam klystron, 5MW Inductive Output Tube, 10MW 12 beam MBK

9. Cavity WG5

10. Cryomodule configuration

11. Cryomodule configuration Baseline 10MW klystron drives 24 TESLA cavities. considering 7% WG loss and 11% overhead for 35MV/m operation Cavities divided into three cryomodules, Quad package in every 4-th cryomodules, Cos(2  )type Quad + corrector windings+BPM, supported from GRP at center post, <10µm bunch-to-bunch resolution BPM Cavity spacing 283mm Contradiction with GG2-BCD!

12. Cryomodule configuration Alternatives 12 cavities in one cryomodule, Cavity spacing 250mm~180mm, HOM readout, Quad-BPM in separate cryostat, Putting movers on center support post and cryomodule support, Reduce Quad aperture to ~35mm, 1µm resolution BPM

13. RF distribution

14. Baseline Alternatives TESLA-TDR like distribution system, circulators and tuners(3-stub or E-H) in each cavity. Elimination of circulators.

15. Cryogenic system

16. Cryogenic system Baseline Alternatives TESLA-TDR like layout, except refrigerator spacing (but likely 5km). Maintenance length is half of the refrigerator spacing. U-tube or turn around for more shorter maintenance length,

17. Tunnel curvature

18. Tunnel curvature Baseline Alternatives The linac will follow the curvature of the earth, unless site-specific reason dictates otherwise. Laser-straight linac, Straight-line segments.

19. Tunnel layout

20. Tunnel layout Baseline Alternatives RF sources to be located outside the beam tunnel, to be distributed along a second tunnel or surface gallery that run parallel or near by the beam tunnel. Three WR650 WG to each rf unit (one WG per cryomodule) TESLA-TDR like layout. Contradiction with RF distribution BCD!

21. BCD RF unit

22. BCD RF unit cartoon Bouncer modulator Multi-beam klystron Pulse transformer LLRF & instrumentation RF waveguides cryomodules RF distribution Rey.hori