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BCD input from WG2
WG2 12/08/2005H. Hayano
Chris Adolphsen
Terry Garvey
Hitoshi Hayano
Summary of BCD input
WG2 R&D activities: EU: TTF(XFEL) US: SMTF,SLAC R&D Asia: STF --> will be summarized by regional directors
WG2: Main Linac
WG2: Main LinacModulatorKlystronCavity packageGradientCryomodule configurationRF distributionCryogenicsTunnel curvatureTunnel layout
By WG5
Revisited by BCD task force
Modulator
Modulator
Baseline
Alternatives
Bouncer-compensated pulse transformer modulator
Marx-style generator,
DTI (Direct switch),DC-to-DC converter
Klystron
Klystron
Baseline
Alternatives
10MW multi-beam klystron
10MW sheet beam klystron,5MW Inductive Output Tube,10MW 12 beam MBK
Cavity
WG5
Cryomodule configuration
Cryomodule configuration
Baseline10MW 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 BPMCavity spacing 283mm Contradiction with GG2-BCD!
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
RF distribution
RF distribution
Baseline
Alternatives
TESLA-TDR like distribution system, circulators and tuners(3-stub or E-H) in each cavity.
Elimination of circulators.
Cryogenicsystem
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,
Tunnelcurvature
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.
Tunnellayout
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!
BCD RF unit
BCD RF unit cartoon
Bouncer modulatorMulti-beam klystron Pulse transformer
LLRF & instrumentationRF waveguides
cryomodulesRF distribution
Rey.hori