1 / 6

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”

laban
Download Presentation

Handshake Issues

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related