1. TDR guideline discussion on Cavity Integration
GDE-SCRF
TDR guideline discussion on Cavity Integration
H. Hayano

2. Tuner
(2) Coupler
(3) Magnetic shield
(4) Beam pipe/coupler flange
(5) Plug-compatibility boundary definition

3. S1-Global
FNAL cavity
DESY cavity
KEK-type1 cavity
KEK-type2 cavity

4. (1) Tuner Baseline of tuner is not yet decided.
Now, we have 4 kind of tuner test results from S1-Global test.
LFD compensation works for 4 kind of tuner.
In case of adaptive FB, more wide-band piezo driver will be necessary for KEK stiff tuners.
Found failure: wrong drive gear connection,
jack gear stuck by bend of slide-jack slope,
piezo break-down, (S1-G)
drive screw stuck, motor-wire short, … (FNAL CM-1, CM-2)
(1) Stiff tuner / non-stiff tuner ?
(2) Motor outside/ Motor inside? Motor/piezo accessible or not?
(3) Which is robust mechanical design?
(4) LV Piezo/HV Piezo? Casing? Stroke?
(5) Which is cost-effective design?

5. (2) Coupler Baseline of coupler is TTF-III.
Now, we have two types of coupler results from S1-Global test.
Power transmission works for 2 kind of coupler by reasonable short RF process time.
Heat load performance were different.
Found failure: Big static/dynamic heat load, break-down,
copper plating with Ni-strike, thermal anchor position,
assembly bolts stuck, (S1-G)
center conductor miss-alignment,
copper/metal flake contamination into cavity,
copper plating non-uniformity, … (FNAL, DESY)
(1) Cylindrical window/ disk window?
(2) Copper coating method
(3) Contamination to cavity

6. Now, we have two types of magnetic shield results from S1-Global test.
There was no clear evidence of performance difference.
Shield Outside : require many piece of shield to cover tuner complex,
Shield Inside : make string assembly simple,
(Q) same shielding performance
after tank-weld heat experience?
Outer-diameter =229
KEK cavity
(1) Outside shielding/ shield inside?
(2) HOM cup interference for shield insertion?
(3) End-cell shield/ cover-all end-group connection?

7. Now, we have two kinds of flange & seal in S1-Global test.
(4) Beam-pipe/coupler flange, seal
Now, we have two kinds of flange & seal in S1-Global test.
There was no clear evidence of performance difference.
( However, they were not interconnected.
Hexagonal system in module-C and Helicoflex system in module-A were independent.)
(1) Al Hexagonal seal / Sn coated Helicoflex?
DESY/FNAL cavity
KEK cavity
(2) Flange diameter?
(3) Beam pipe/coupler diameter?
(4) Bolts and Nuts? SUS-bolt & CuBe-Nut? 80 78
140
Coupler port diameter
40mm(DESY,FNAL) / 60mm (KEK)
124

8. LHe vessel Ti vessel / SUS vessel. (1) Where is transition?
(2) Welding / brazing
(3) Which is cost effective?

9. (5) Plug Compatibility boundary specification

10. (1) beam pipe port flange ( beam pipe diameter )
Cavity boundary
BCD: TESLA-short cavity
cavity boundary
(1) beam pipe port flange ( beam pipe diameter )
(2) coupler port flange ( port pipe diameter )
(3) 4 support tabs
(4) He pipes

11. Input coupler boundary
BCD: TTF-III coupler
input coupler boundary
cavity port flange ( port diameter )
(2) cold/warm part interface flange
(3) cryostat vessel flange
(4) waveguide flange

12. TDR writing basement (1) Baseline: TESLA cavity with ILC-short length
+ TTF-III coupler
*Baseline of Tuner : need to down-select, after performance & cost comparison
(2) Performance: need to describe on
RF, thermal, Mechanical, Electrical -performance
(3) Procedure: need to describe on
Fabrication, Treatment, Inspection, Test -Procedure
(4) Plug-compatibility: describe clear boundary definition
(5) High-pressure-vessel Regulation:
need to describe how to clear it

13. End of slide