Discussion on Cavity Integration at GDE-SCRF Meeting in Beijing
Explore the details of the TDR guideline discussion on cavity integration at the GDE-SCRF meeting held in Beijing on 12th August 2011. The discussion covers topics such as tuners, couplers, magnetic shields, and beam pipe/coupler flanges, highlighting key considerations and test results.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
GDE-SCRF meeting@Beijing, 12082011 TDR guideline discussion on Cavity Integration H. Hayano
(1) 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
(3) Magnetic shield 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?
(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.) KEK cavity DESY/FNAL cavity (1) Al Hexagonal seal / Sn coated Helicoflex? (2) Flange diameter? (3) Beam pipe/coupler diameter? (4) Bolts and Nuts? SUS-bolt & CuBe-Nut? 80 140 78 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?
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 (1) 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
