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Timing and synchronisation

This document outlines the recent improvements in timing and synchronization systems critical for SPS extraction and LHC injection. Key topics include the implementation of a new prepulse system using warning pulses, stable prepulses for BI, and the resolution of timing issues. Additionally, it covers RF frequency control, an upgrade to the frequency range, and the permanent availability of rephasing error signals in OASIS. Injection requests for the next ring/bucket are streamlined, while a proposed definitive solution for timely payload delivery is under discussion.

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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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