TTC Topical Workshop on SRF Cryomodule Clean Room Assembly Clean Room Component Preparation and QC of IHEP ILC Test Cryomodule Assembly Jiyuan Zhai (IHEP)  TTC Topical Workshop on SRF Cryomodule Clean Room Assembly CEA Saclay, 12-14 November 2014

Components Cleaning Wipe with acetone (ultrasonic with ethanol) Ultrasonic with 2% Liquinox at 50 C for 20 min Rinse with UPW at RT Ultrasonic with UPW at RT for 10 min Rinse with UPW (or ethanol) at RT Dry in Class 10 Blow-off to Class 10 (except long bellows for vacuum pumping and purging)

Coupler Cold Part Assembly

All-Metal Gate Valve and Angle Valve Wipe, blow to clean, half-open, blow to clean, keep open during assembly

Gate Valve Assembly Wrong assembly of the gate valve seat side. This side should face the cavity Leak rate will be higher. Cleanness OK. Allowable differential pressure 2 bar in either direction.

HOM Feed through and Field Pickup Thermal shock and leak check BCP the Nb tip (1:1:1, 1 min), rinse Ultrasonic with ethanol 20 min Blow in liquid N2 (10 min) vacuum bake (110 C, 6 hrs)

Gaskets WEPEK AlMg gasket NW78, NW8: beam pipe, HOM&FP wipe with acetone (black stain) and blow U-tight Sn-plated helico-flex gasket 15037: FPC wipe with ethanol and blow CF35,16 OFC Any scratch, discard Al gaskets provided by a Chinese vendor used for ADS spoke cavity. Leak-tight in RT, leak in LHe. Add torque, then leak tight (loose after cooling down/thermal shock).

Fasteners Stud 316L SS Rolled, Electro Polished; Hex Nut - Silicon Bronze (Kuprodur) Ultrasonic with warm Liquinox, dry, blow clean to ~100 (> 0.5 um) During (warm) ultrasonic cleaning, Al complements never touch to each other and other material; avoid Al. No Micro-90 for Cu, Al, Mg and Zn.

Particle Free Flange Assembly

Cavity and beam tube Assembly

3 m long beamline (large grain low-loss 1.3 GHz 9-cell cavity)

Special thanks to JLAB, FNAL and KEK colleagues. Thank you!