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Two-beam Test Stand Status and Results

This report summarizes the status and results of the 12 GHz PETS testing at CLEX, including the variable splitter coupling, variable phase shifter, and the production of power with re-circulation. The tests demonstrate the nominal CLIC power level and pulse length.

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Two-beam Test Stand Status and Results

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  1. Two-beam Test StandStatus and Results Roger Ruber & Igor Syratchev for the TBTS team

  2. 12 GHz PETS testing at CLEX To the Load Variable Splitter (coupling: 01) Variable phase shifter PETS output CTF3 PETS input #1 Drive beam DL CR DBA CTF2 TBTS CLEX #2 #3 • Different scenarios of the drive beam generation in the CTF3 • In order to demonstrate the nominal CLIC power level and pulse length, it was decided to implement a different PETS configuration – PETS with external re-circulation. Round trip efficiency: 75% Round trip delay: 22 ns <30A 14 A Expected PETS power production with re-circulation. The calculation followed the measured performance of all the components 4 A CLIC nominal • To compensate for the lack of current, the active TBTS PETS length was significantly increased: from the original 0.215 m to 1 m. 6.0 A 5.0 A 4.0 A 3.5 A 240 ns CLIC nominal

  3. PETS high power tests at CERN (TBTS) The first RF 12 GHz power generation from the PETS in re-circulation regime 15.11.008 PETS tank installed in CLEX 15.10.08 BPM signals RF signals Power gain = 6 No re-circulation Input for calculations: I = 1.18 A Coupling = 0.82 ~Measured: Similar to SLAC, the conditioning of the system is accomplished with heavy out gassing.

  4. NorduCLIC Two-Beam Test Stand ( Work in progress – results from last Friday ) Pmeas Imeas xd,meas Ppred xd,pred P [MW] xD [mm] I [A] Relevance for the Decelerator BD studies : the effect of the PETS on the Drive Beam

  5. RF Power Generation (150ns pulse) • 1.25 MW max. at 1.93 A, no significant beam loss • comparison RF power to beam current:→ assume 21 Nov.2008 no re-circulation

  6. Power Generation with Re-circulation • max. 5.2 MW power at 1.8Afactor 4.4 compared to 1.25 MW at 1.9 A w/o circ. • not sure about phase-shift & variable splitter 28 Nov.2008 with re-circulation 0.95 MW 0.32 offset

  7. BPM 4: x4 BPM 3: x3 BPM2: x2 BPM 1: x1 dipole BPM5: x5 beam kick [θ,δ] Beam Kick Measurements • 5 BPMs in each beam line • 2 before: incoming angle & offset • 2 after: kick angle • dipole + BPM5 for energy measurement

  8. Estimation of Beam Bending in PETS bend: • g for bend in centre of PETS • incoming beam not on PETS axis • gradual change along pulse 21 Nov.2008 no re-circulation

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