Transcript Present planning for PMD

PMD Plans
• Detector Issues and solution
• Plans for LS1
29 June 2012
Present PMD Status
PMD has been in the SUPERSAFE state for last few
months because:
• SOR problem
(which may not be directly related to PMD DAQ
• High beam luminosity
Detector issues
(before the Technical Stop)
– One FRT top was not working properly which
disables the 5-chains of the detector
– Low voltage problem for the one quadrant of the
detector.
– PMD busy at the start of run when there was a
abrupt stop of previous run due to any reason.
– Sync trigger to be tested
Follow up during the Technical Stop
this week
• Planned follow up :
– One CROCUS FRT was replaced and is working fine.
– One faulty cable of 3486 (48V power module) was
repaired and now it is ok.
– Sync trigger is tested by Roberto on 26/06 afternoon
and which is working fine.
– Roberto simulated the PMD and other detector
getting busy in previous run and then in new run the
start of run problem was solved by sync trigger sent to
PMD.
Present planning for PMD
• Testing in the standalone runs this week and with the
beam next week
• Depending on the test results we can decide to:
• Run the PMD with rest of the subsystems for
sometime
• Or we can keep it in supersafe for now and get
into the run in September to be ready for the pA
run in November.
• We monitor PMD performance closely during this
time and during the next Technical stop and fix all
the issues before the pA run.
Rate limitation
• PMD has the L1 rejection time of 13μsec
which makes our detector work at maximum
rate of 76KHz.
• Right now this is the maximum rate which
MCH group could achieve with CROCUS (PMD
is following the same electronics.
Following the plans for muon arm:
We are in contact with Bruno regarding the
development in muon arm. They plan to have a
prototype by the end of 2014.
So at present there is no other solution to
increase the rate capability.
Plans for LS1:
1. Additional patch panels near the PMD position:
Arrangement of LV cables near the detector
1. Rearrangement of LV cables and ELMB boxes on the PMD
2. Crocus cables to be properly routed
3. Better mechanism for CROCUS crate movement
• Hoist mechanism to lift/lower CROCUS enclosure
support structure
4. Repair of the chain-sprocket system that moves the
support structure along the mini frame
Additional patch panels at PMD final position
Relocation of ELMB and LV distribution boxes
Present LVDB and Patch bus cable location
New ELMB and
LVDB location
Present LVDB and Patch bus cable location
New
ELMB
and
LVDB
location
Present LVDB and Patch bus cable location
New ELMB and
LVDB location
New
ELMB
and
LVDB
location
Modification to PMD movement system
Plans for LS1:
• Other queries
• The cooling up gradation is not required. This cooling system
is sufficient for the full detector in operation.
• Additional cable from CR’s to cavern may not be required
provided that there in no damage to present cable due to
intervention of other sub-detector work.
• Additional network outlets not required.
• Additional rack space not required
provision for another CAN BUS cable for the ELMB's and
split our ELMB's PMD plane wise so as to have more
flexibility and control considering the fact that we are
planningto change the ELMB positions also.