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Handshakes and modes in 2011

Handshakes and modes in 2011. Handshakes. Communication protocol over DIP between LHC & experiments Goal: inform EXP’s about any critical action to be performed by the machine and get detectors confirmation they are in SAFE STATE before starting the action 5 different handshakes:

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Handshakes and modes in 2011

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  1. Handshakes and modes in 2011 R. Alemany BE/OP/LHC LHC Beam Operation Committee meeting

  2. Handshakes • Communication protocol over DIP between LHC & experiments • Goal: inform EXP’s about any critical action to be performed by the machine and get detectors confirmation they are in SAFE STATE before starting the action • 5 different handshakes: • LHC_INJECTION • LHC_ADJUST (↔ STABLE BEAMS) • LHC_BEAMDUMP (↔ STABLE BEAMS) • LHC_TI2_SETUP • LHC_TI8_SETUP • EDMS doc 1031913 • DATABASE RESTRICTION: two handshakes (or more) cannot be started at the same time. Only LHC_TI2/TI8_SETUP can start at the same time ↔ TRANSFERLINE SETUP (ALICE/LHCbONLY ) R. Alemany BE/OP/LHC LHC Beam Operation Committee meeting

  3. R. Alemany BE/OP/LHC LHC Beam Operation Committee meeting

  4. Beam dump handshake becomes informative R. Alemany BE/OP/LHC LHC Beam Operation Committee meeting

  5. LHC Modes • Summary status of the operational activity. Distributed for: • information • conditioning sub-system response(e.g. experiments operation, movable devices allowed in beam) • There are two modes: • ACCELERATOR MODE: provides a general overview of the machine activity (e.g. proton physics, access, shutdown, etc.) • BEAM MODE: provides the state of the machine with regard to the machine cycle (e.g. injection, ramp, etc.) • EDMS doc 865811 R. Alemany BE/OP/LHC LHC Beam Operation Committee meeting

  6. TABLE IMPLEMENTED IN THE DATABASE AS CONSTRAINT; ONLY THIS COMBINATION OF ACCELERATOR VS BEAM MODES ALLOWED R. Alemany BE/OP/LHC LHC Beam Operation Committee meeting

  7. Automatic and systematic end of fill • Experiments request a systematic way of signaling the end of fill=end of data taking in order to trigger the end of fill statistics  this will be done with the mode BEAM DUMP • PROGRAMMED DUMP  handshake and programmed dump sequence • UNPROGRAMMED DUMP  logic (SIS): once BEAM MODE = STABLE BEAMS if B1/B2 BIC LOOP OPEN  beam mode will be automatically changed to BEAM DUMP R. Alemany BE/OP/LHC LHC Beam Operation Committee meeting

  8. INJECTION PHYSICS BEAM • SIS will monitor the intensity value and once the safe beam limit is passed will trigger the automatic change of the beam mode to INJECTION PHYSICS BEAM R. Alemany BE/OP/LHC LHC Beam Operation Committee meeting

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