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Timing and synchronisation

Timing and synchronisation. Fast timing/synchronisation prepulses for SPS extraction and LHC injection with new prepulse system (using warning pulses) prepulses for BI (21 turns before injection) stable some GMT timing issues... RF frequency control & rephasing

lawrence-mckenzie
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Timing and synchronisation

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  1. Timing and synchronisation • Fast timing/synchronisation • prepulses for SPS extraction and LHC injection with new prepulse system (using warning pulses) • prepulses for BI (21 turns before injection) stable • some GMT timing issues... • RF frequency control & rephasing • change LHC reference frequency (temporarily Agilent generator) • SPS rephasing follows correctly • some bugs ironed out in the rephasing system • frequency range +/- 800Hz @ 400 MHz will be increased by factor 2 • rephasing error signal will be made permanently available in OASIS

  2. RF synchro bucket/ring selection • Injection request specifies next injection ring/bucket • Next injection ring/bucket sent as payloads of timing events HX.RGNI and HX.BKNI • Used by LHC RF synchro equipment to reconfigure fc and LHC injection pulse generator delays. Injector chain follows. • HX.RGNI and HX.BKNI need to arrive 450ms before PS-SPS transfer • BUT: injection request mechanism in CBCM means they are sent only at start of SPS LHCFAST cycle • “Quick fix” found using sequencer. Julian proposes more definitive solution. To be discussed... fc

  3. Rephasing error signal

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