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Handshake Issues

Handshake Issues. Sigi Wenig CERN/PH-ATLAS 4-September-2009. Detector Actions – Adjust, Beam Dump Handshakes. Adjust Handshake – during “Prepare” Assure that SCT/Pixel/Muon are brought to stand-by  “Ready”

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Handshake Issues

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  1. Handshake Issues Sigi Wenig CERN/PH-ATLAS 4-September-2009

  2. Detector Actions – Adjust, Beam Dump Handshakes • Adjust Handshake – during “Prepare” • Assure that SCT/Pixel/Muon are brought to stand-by  “Ready”  Assume that Beam Mode stays on “Stable_Beams” until LHC sends “Ready” (following new sequence), because Pixel goes to stand-by during “Prepare” in a different way than when “Stable_Beams” flag disappears  Observation: Shifters are confused to see Beam Mode changes while experiment is on “Prepare”  Proposal: Do not change beam mode until LHC sends “Ready” • Beam Dump Handshake – during “Prepare” • Assure that SCT/Pixel/Muon are brought to stand-by  “Ready”  Assume that Beam Mode stays on “Stable_Beams” until LHC sends “Ready” (following new sequence), idem Sigi Wenig

  3. Injection – Handshake – Permit – Inhibit • Injection Handshake – during “Prepare” • Assure that BCM/BLM are operational • Assure that SCT/Pixel/Muon are on stand-by • Assure that Roman Pots are out • Turn manually a key in ACR to give final Injection_Permit  “Ready”  Assume that Beam Mode stays on “Prepare_for_Injection” until LHC sends “Ready” (following new sequence; incompatibility of (1) and (3) in Minutes) • Injection_Permit removed automatically if • BCM/BLM not operational • Pixel/SCT/Muon on running voltage • RP in • Stable beam flag “TRUE” • Post Mortem Event received • Injection_Permit can be removed manually via emergency button in ACR if “abnormal “ beam conditions are observed after injection cycle • Experience will tell how useful and whether possible to make automatic Sigi Wenig

  4. Handshake – DCS Panel Sigi Wenig

  5. Switch to LHC Timing/Clock • Reminder • Experiments requested stable availability of LHC clock at any moment • RF experts declared that this is not possible (during RF synchronization) • It was agreed that stable availability of LHC clock is guaranteed as soon as beam is in LHC • Proposal/Understanding • Stable availability of LHC clock is guaranteed with Beam Mode change from “Prepare_for_Injection” to “Injection_Pilot” • Comment • Stable availability of LHC clock only when Beam Mode “Stable_Beams” is too late Sigi Wenig

  6. Open Issues and AOB • Where is “Prepare_for_Injection” in Beam Mode diagram • Injection Handshake can also lead to “Inject_and_Dump” and “Circulate_and_Dump” !? • Clarify when LHC message “OK” appears during Handshakes, in particular Injection • “Problem” message • How to handle controlled beam dump request of experiment in case of a problem which does not justify an emergency beam dump request • During handshake dry run on 13-Au-09 Safe Machine Parameters have not been available on DIP Sigi Wenig

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