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Requirements for Cryomodule
What have to be inevitably realized?
Fundamental ParametersExample
Parameters Numbers Notes
ILC Energy 500 GeV
SCRF Gradient 31.5 MV/m
No. of Cavity/module 8 or 9
V.V. Envelope: (L, D) 12 m, 1 m
LHe vessel envelope (O.D.) 0.x m
Cavity aperture 0.x m
Diameter of Pumping Line (dp) 0.25-0.3 m
Supports
Radiation shield
Theral load
Fundamental Parameters
Requirements
• Accommodate Cavities with thermal insulation– Vac. Vessel (spatial envelope)– Mechanical support (stability against vibration)
• Provide (function)– Vacuum pumping (>> pressure)– Cooling (>> cooling capacity) – RF input (>> Coupler), – Provide Tunability (>> Tuner)– Higher mode .. ( >> HOM ,,)
What inevitably required?
• Performance parameters unified, • Interface for connection unified,
– Cryomodule to cryomodule– Cromodule to end box– Cryomodule to peripheral components
• Size of vacuum vessel, type of flanges/pipes, • Mechanical, high-pressure, electrical acceptance criteria,
• Delivery after/before assembly, cold test?
How we may provide? > 1000 cryomodules
• As my personal impression,– Sharing production with multiple institutions and m
ultiple companies,– Multiple production lines and test facilities inevitab
ly required, assuming the delivery after the cold test,
– Capital investment (off-sent) to be rather independent from the concept of “unified design” or “plug-compatible”
Understanding and Strategy• No design yet satisfy the ILC performance,
– No unified design can be selected,
• How we may reach the necessary design with industrialization experience?– Learn mass production from well established design (with rec
ognizing less performance)– Try to keep more R&D to reach the performance with smaller
scale, – Those can be carried out in parallel and complementary arou
nd the word, – It is important that both progress is to be shared in world wid
e scale, – It is also important that the all alternates to be plug-compatibl
e to the base line envelope.
SummaryAs my personal view, we need to:– Have “unified” design parameters and functional int
erface– Allow “plug-compatible” functions, and component
s, (based on the best effort for the unified design, ) • As alternatively available technology to back-up the base
line design componets, • as possible alternate production under the condition of n
o major cost increase and as option with superior performance/cost
– It may be useful to minize risks possiby caused by the single design and production,
– The well balanced scientific and engineering feed back may be important.
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