BCD input from WG2

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BCD input from WG2
WG2 12/08/2005 H. Hayano

• Chris Adolphsen
• Terry Garvey
• Hitoshi Hayano

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Summary of BCD inputWG2 RD activities
EU TTF(XFEL) US SMTF,SLAC RD
Asia STF --gt will be summarized by regional
directors
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WG2 Main Linac
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WG2 Main Linac Modulator Klystron Cavity
package Gradient Cryomodule configuration RF
distribution Cryogenics Tunnel curvature Tunnel
layout
By WG5
Revisited by BCD task force
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Modulator
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Modulator
Baseline
Bouncer-compensated pulse transformer modulator
Alternatives
Marx-style generator, DTI (Direct
switch), DC-to-DC converter
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Klystron
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Klystron
Baseline
10MW multi-beam klystron
Alternatives
10MW sheet beam klystron, 5MW Inductive Output
Tube, 10MW 12 beam MBK
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Cavity WG5
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Cryomodule configuration
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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
windingsBPM, supported from GRP at center
post, lt10µm bunch-to-bunch resolution
BPM Cavity spacing 283mm
Contradiction with GG2-BCD!
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Cryomodule configuration
Alternatives
12 cavities in one cryomodule, Cavity spacing
250mm180mm, HOM readout, Quad-BPM in separate
cryostat, Putting movers on center support post
and
cryomodule support, Reduce Quad aperture to
35mm, 1µm resolution BPM
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RF distribution
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RF distribution
Baseline
TESLA-TDR like distribution system,
circulators and tuners(3-stub or E-H) in each
cavity.
Alternatives
Elimination of circulators.
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Cryogenic system
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Cryogenic system
Baseline
TESLA-TDR like layout, except
refrigerator spacing (but likely
5km). Maintenance length is half of the
refrigerator spacing.
Alternatives
U-tube or turn around
for more shorter maintenance length,
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Tunnel curvature
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Tunnel curvature
Baseline
The linac will follow the curvature of the
earth, unless site-specific reason
dictates otherwise.
Alternatives
Laser-straight linac, Straight-line segments.
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Tunnel layout
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Tunnel layout
Baseline
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)
Contradiction with RF distribution BCD!
Alternatives
TESLA-TDR like layout.
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BCD RF unit
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BCD RF unit cartoon
Pulse transformer
Multi-beam klystron
Bouncer modulator
Rey.hori
LLRF instrumentation
RF waveguides
RF distribution
cryomodules