Transcript Handshake_with_the_experimentsIIx

Handshake with the experiments
04/09/2009
R. Alemany (BE/OP/LHC) LHC Experiments
Handshake
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INJECTION PHASE
04/09/2009
R. Alemany (BE/OP/LHC) LHC Experiments
Handshake
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LHC
ALICE
INJECTION PHASE
ATLAS
CMS
LHCb
LHCf
PREPARE
- Detector preparing
for injection: HV off (
only some subdetors)
- BCM/BLM
operational
- Once everything OK
INJECTION PERMIT =
TRUE (can be manual
or automatic)
PREPARE
-ECS prepares for
injection
PREPARE
-Detectors go to safe
mode, i.e. power off
- The LHCf injection
permit is software
LHCf -> DIP -> cmw >SIS
- Once LHCf is safe
software injection
permit = true
READY
Once everything
ready, automatically
INJECTION PERMIT
= TRUE (when going
to READY)
READY
BEAM MODE = SETUP: pre-injection plateau and injection plateau no beam
WARNING (sent ~ 10 minutes before the injection)
PREPARE
-BCM operational
- All ALICE subdetectors in safe
mode, i.e. reduced HV and nominal
LV for electronics
- ZDC out
- BCM and V0 operational
PREPARE
- BCM/BLM
operational
-SCT/pixel/muon
STANDBY
- Roman Pots out
- Once everything OK
manual turn of the
key to INJECTION
PERMIT = TRUE
IMMINENT (sent ~ 3-4 minutes before the injection. Once IMMINENT is sent, we guarantee that the LHC
RF timing is stable and the detectors can switch to the LHC timing)
READY
Once everything OK, INJECTION
PERMIT = TRUE (manual, i.e.
OPERATOR command which is active
only if ALICE= SAFE .AND. ALICE
HANDSHAKE = READY)
READY
READY
READY (After the experiments and LHC are ready for injection we’ll take some time to do TRANSFER LINE SETUP before changing the mode to INJECTION
PROBE BEAM)
BEAM MODE = INJECTION PROBE BEAM OR INJECT AND DUMP OR CIRCULATE AND DUMP
BEAM MODE = INJECTION SETUP BEAM (WITH BEAM DUMP), INJECTION PROBE BEAM and INJECTION PHYSICS BEAM … once the injection is finished
OK
INJECTION PERMIT = FALSE
(automatic)
STANDBY
VETO
VETO
INJECTION PERMIT =
FALSE (see next slide )
VETO
Whenever the HV ON
INJECTION PERMIT =
FALSE
VETO
INJECTION PERMIT
= FALSE
VETO
• ATLAS injection permit is removed automatically
if:
–
–
–
–
–
BCM/BLM not operational
SCT/Pixel/ muons on running voltage
Roman Pots IN
STABLE BEAM FLAG = TRUE
Post Mortem event received
• ATLAS injection permit can be removed manually
(ACR button) if:
– Abnormal beam conditions are observed during
injection
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R. Alemany (BE/OP/LHC) LHC Experiments
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ADJUST PHASE
LHC
ALICE
ATLAS
CMS
LHCb
LHCf
PREPARE
-ATLAS subdetectors
go to safe mode
- Roman Pots out
PREPARE
- CMS subdetectors
go to safe mode
PREPARE
- LHCb subdetectors
go to safe mode
PREPARE
-Detector goes to safe
mode
READY
READY
READY
READY
VETO
VETO
VETO
VETO
BEAM MODE = STABLE BEAMS OR UNSTABLE BEAMS
WARNING (sent ~ 10 minutes before the adjust)
PREPARE
- All ALICE subdetectors go to safe
mode
- ZDC out
IMMINENT (sent ~ 3 minutes before the adjust)
READY
READY
BEAM MODE = ADJUST
Once ADJUST is done
OK
STANDBY
VETO
Notes:
1. From ADJUST to BEAM DUMP no handshake is needed because the
detectors are already in safe mode.
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BEAM DUMP PHASE
LHC
ALICE
ATLAS
CMS
LHCb
LHCf
BEAM MODE = STABLE BEAMS (and whenever possible UNSTABLE BEAMS, i.e. if not an emergency dump)
WARNING (sent ~ 10 minutes before the dump)
PREPARE
- All ALICE subdetectors go to safe
mode
- ZDC out
PREPARE
-ATLAS subdetectors
go to safe mode
- Roman Pots out
PREPARE
- CMS subdetectors
go to safe mode
PREPARE
- LHCb subdetectors
go to safe mode
PREPARE
-Detector goes to safe
mode
READY
READY
READY
READY
VETO
VETO
VETO
VETO
IMMINENT (sent ~ 3 minutes before the dump)
READY
READY
BEAM MODE = BEAM DUMP
Once DUMP is done
OK
STANDBY
VETO
Notes:
1. From UNSTABLE BEAMS to BEAM DUMP do handshake whenever is possible, i.e. if
not an emergency dump
2. We question the need of the beam mode BEAM DUMP WARNING, the experiments
don’t need it, handshake is enough. It may disappear from the MODE diagram
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