Wei Gai TsinghuaANL LCWS2016 Aiina Certer amp MALIOS in Morioka IWATE Japan 49 December 2016 Outline Overview of Xband at Tsinghua Development of Structures Preparations ID: 1039554
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1. X-band and high-gradient development plans at Tsinghua UniversityWei Gai (Tsinghua/ANL) LCWS2016, Aiina Certer & MALIOS in Morioka, IWATE (Japan) 4-9 December 2016
2. OutlineOverview of X-band at TsinghuaDevelopment of StructuresPreparations for the test standSummary
3. X-band HG at Tsinghua UniversityCLIC-study collaboration (From 2009)“Choke-mode damped structure”, design, producing, …T24_THU_#1 structureSingle-cell chokeTD24-chokeTsinghua Thomson scattering sourceStatusUpgradeNew X-band power source
4. Tsinghua Production – Key facilities to HGHigh-precision machine tools and CNC MachineClean room for RF MeasurementHydrogen furnace
5. OutlineOverview of X-band at TsinghuaDevelopment of StructuresPreparations for the test standSummary
6. Development of T24_THU_#1X-band high gradient structure，frequency：11.424GHzBench test, diffusion bonding, brazing, tuning and Vacuum bake at TsinghuaT24 is high-gradient prototype accelerating structure for CLIC main linacBench testDiffusion bondingT24 at KEK
7. High power test of T24_THU_#1High power test was carried out in Nextef at KEKRunning at 110 MV/m, 250 ns stablyVery good performance!T24 during the high power test
8. Choke-mode structureStudy X-band high gradient choke-mode damped structureNew choke design meets the CLIC requirement of wakefield suppressionThree single-cell choke-mode structures were designed, fabricated to study the performance of choke under high powerTHU-CHK-G1.68/THU-CHK-G2.1/THU-REFHigh power test ongoing at KEKDiffusion bonding testSingle-cell structuresRF design
9. High power test of Choke-modeTHU-CHK-G1.68 can reach a maximum gradient of 75 MV/mTwo types of breakdowns were observed during the testBreakdown with current flash-breakdown in the cavityBreakdown without current flash-breakdown in the chokeFurther analysis still ongoing
10. A X-band (Copper) Power Extractor for ANL
11. C3 structure at 11.7GHzDesign at ANL, 3 regular cells + 2 matching cellsBrazing design
12. 12Drive BeamRFWitness BeamDrive offDrive onHigher energyC3 structure at 11.7GHz
13. OutlineOverview of X-band at TsinghuaDevelopment of StructuresPreparations for the test standSummary
14. Layout of accelerator laboratory at Tsinghua UniversityX-band structuresX-band klystronMain experimental hall（TTX）Location of X-band high power test standAisleSquare hall
15. X-band high power test standModulator(Scandinova)KlystronSSAMicrowave signal generatorDirectional couplerPulse compressorLLRF systemR&S® SMB100A ComputerDirectional couplerVacuum pumping portVariable RF power splitterX-band structuresRF loadPreparations for the test standAvailableOrderedDesignedIn design
16. Frequency : 100kHz to 12.75GHzPeak power: 27dBmR&S® SMB100A（Available） X-Band 1300W Pulsed Power AmplifierKlystron X-band high power test stand
17. Pulse compressorTE114f0=11.424GHzCoupling hole179mm66mmPolarizerCompact Design:Q0: 94000Peak Power Gain : 6.2Compression ratio: 10E-Field
18. RF componentsVariable RF power splitterPort 1Port 2Port 3Port 4Vacuum pumping port
19. RF componentsPort 1Port 2Port 1Port 1Directional couplerX-band stainless steel RF load
20. X-band application for Thomson scattering Source1.5m x30MV/m(S-band) &&2x0.6m x80MV/m(X-band)X-band constant impedance structurePulse compressor1.5us,50MW
21. X-band structure design, Preliminary Will be refined with the info of RF power source available.parametersfrequency11.424GHzPhase adv120degree# cells72length630mmFilling time104nsa3.5mmvg/c2.01R/Q13.9(kOhm/m)Q6955P Input 64.5 (14.3)MWEacc80MV/mS21-4.7dB
22. OutlineOverview of X-band at TsinghuaDevelopment of StructuresPreparations for the test standSummary
23. SummaryT24_THU_#1 successfully assembled and testedDiscussion: 1) baking 2) careful handling/cleaning Choke-mode damped structures, SW single-cell testGap1.68, Gap2.1, high-power tested @ KEKNew Choke-mode cell in designX-band high power test standLocation settledKlystron、SSA and RF components in preparationT24_THU_#2 in preparationTwo 0.6m X-band structures in design
24. Thanks for your attention ! LCWS2016, Aiina Certer & MALIOS in Morioka, IWATE (Japan)