rf synchronization activity at sparc

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RF Synchronization Activity at SPARC. Gallo and D. Alesini, M. Bellaveglia, R. Boni, G. Di Pirro, A. Drago, A.Ghigo P. Baldini, L. Cacciotti, M. Scampati, A. Sprecacenere, S. Quaglia. EUROFEL DS3 Meeting, CEA-Saclay May 17 th 2005. SPARC PHASE STABILITY SPECIFICATIONS:. SPARC phase I: - PowerPoint PPT Presentation

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  • RF Synchronization Activityat SPARCGallo

    and

    D. Alesini, M. Bellaveglia, R. Boni, G. Di Pirro, A. Drago, A.GhigoP. Baldini, L. Cacciotti, M. Scampati, A. Sprecacenere, S. QuagliaEUROFEL DS3 Meeting, CEA-Saclay May 17th 2005

  • Total cost:

    2.2 k/channel (High Quality)1.4 k/channel (Standard)RF Demodulation Channel based on I&Q Detectorpassive, low cost, 4 quadrants, amplitude independentRF IsolatorCW RFPulsedRF

  • PULSAR I&Q DEMODULATORMODEL ID I4-0428 (custom)

  • PULSAR I&Q DEMODULATORMODEL ID I4-0428 : CALIBRATION

  • PULSAR ID I4-0428 Long Term Acquisition

  • PULSAR ID I4-0428 +ADLINK 9810 20 MS/sPCI Sampling Board Phase Resolution

  • Monitoring the synchronization of the bunch from the Gun and of the laser pulse

  • HOMDYN Time-of-Flight Simulations

  • TM010 2856 MHzR/Q = 28.5 WQ0 = 15000 (Al)Qext = 30000Vp (@ 1 nC) = 4 V= 0.5 msftun 10 kHzTE111 2985 MHzR/Q = 0.5 WQ0 = 17000 (Al)Bunch Monitor Cavity

  • Bench measurements of short pulse synchronization

  • Results of the bench measurements of short pulse synchronization

  • KLYSTRON PHASE LOCK

  • FAST PHASE LOCK FEEDBACK SYSTEMSketch of the Experimental Set-upNoisy RF Station

  • PULSAR ST-G9-411 Phase Shifter

    CALIBRATION

    FREQUENCY RESPONSE

  • Fast Phase Lock Feedback System:Open Loop Gain(amplitude and phase)Lock Amp:Circuit sketch

  • 10ppOpen/Closed Loop Phase Pulses256 frames with 10pp , 10 kHz phase noise

    Single shot phase pulses

  • PHASE STABILITY MEASUREMENTS

    DAFNE LINAC STATION BAugust 2003mixer sensitivity = 5.6 mV/Deg

  • Long Term(90 min) phase variation:

    2.5Short Term(16 shots) phase variation:

    1

  • KLYSTRON PHASE NOISE MEASUREMENTS CONCLUSIONSThe measured phase jitter at the output of the Linac station-B klystron is about 2.5 in long term and and 1 in short term.

    The main contribution seems to come from the driver amplifiers (planar triode technology). In the SPARC case the driver amplifiers will be of a different and better performing technology (pure class A, solid state) with tight phase jitter specification (1 rms). The expected phase jitter values of the SPARC RF stations are consequently lower.

  • BENCH MEASUREMENTS OF A FAST INTRA-PULSE PHASE-LOCK CONTROLAn intra-pulse phase-lock system is under study to actively correct the fast phase jitter coming from the RF stations. Since the RF pulse is about 4.5 ms long, the rise time of such a system should be of the order of 1 ms, corresponding to a bandwidth of about 1 MHz. Consequently a fast phase modulator is needed, while the overall delay of the connections (including the group delay of the RF station) should be limited to 100 ns. The speed of the OpAmps manipulating the signal has also to be adequate.