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

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Presentation transcript:

Two-beam Test Stand Status and Results Roger Ruber & Igor Syratchev for the TBTS team

12 GHz PETS testing at CLEX Operation mode#1#2#3CLIC Current, A< Pulse length, ns140<240< Bunch Frequency, GHz12 3 PETS power (12 GHz), MW < DBA CRDL TBTS CLEX CTF3 CTF2 #1 #2 #3 Different scenarios of the drive beam generation in the CTF3 To compensate for the lack of current, the active TBTS PETS length was significantly increased: from the original m to 1 m. 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. Variable Splitter (coupling: 0  1) Variable phase shifter To the Load PETS output Drive beam PETS inputRound trip efficiency: 75% Round trip delay: 22 ns <30A 14 A 4 A 3.5 A 4.0 A 5.0 A 6.0 A 240 ns CLIC nominal CLIC nominal Expected PETS power production with re-circulation. The calculation followed the measured performance of all the components 2

PETS high power tests at CERN (TBTS) The first RF 12 GHz power generation from the PETS in re- circulation regime No re-circulation Power gain = 6 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. PETS tank installed in CLEX BPM signalsRF signals 3

Two-Beam Test Stand Relevance for the Decelerator BD studies : the effect of the PETS on the Drive Beam ( Work in progress – results from last Friday ) NorduCLIC P pred I meas P meas x d,pred x d,meas 4

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

11-Dec-2008 Power Generation with Re-circulation max. 5.2 MW power at 1.8A factor 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 6

11-Dec-2008 Beam Kick Measurements 5 BPMs in each beam line 2 before: incoming angle & offset 2 after: kick angle dipole + BPM5 for energy measurement BPM5: x 5 BPM 1: x 1 BPM2: x 2 BPM 3: x 3 BPM 4: x 4 dipole beam kick [θ,δ] 7

11-Dec-2008 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 8