TDR guideline discussion on Cavity Integration GDE-SCRF meeting@Beijing, 12082011 TDR guideline discussion on Cavity Integration H. Hayano

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

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

(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?

(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

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?

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

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

(5) Plug Compatibility boundary specification

(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

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

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

End of slide