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.