1. 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, November 2014

2. 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)

3. Coupler Cold Part Assembly

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

5. 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.

6. 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)

7. 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).

8. 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.

9. Particle Free Flange Assembly

10. Cavity and beam tube Assembly

11. 3 m long beamline (large grain low-loss 1.3 GHz 9-cell cavity)

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