dt infrastructure: lv, hv, gas
DESCRIPTION
DT Infrastructure: LV, HV, Gas. CMS week 28 June 2011 A. Benvenuti (INFN Bologna). A Few Problems Since May Workshop . 5 Work Packages for LV related problems 6 WP for HV fixes Fan Tray Operation test (with Silverio Dos Santos) => It does not !. LV Problems. - PowerPoint PPT PresentationTRANSCRIPT
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DT Infrastructure: LV, HV, Gas
CMS week28 June 2011
A. Benvenuti (INFN Bologna)
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A Few Problems Since May Workshop
5 Work Packages for LV related problems 6 WP for HV fixes• Fan Tray Operation test (with Silverio Dos Santos) => It does not !
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LV Problems
In reality only two problems in YB-1:- A3100 Connector temperature
- A3050 (MB1 MB2 S12) repeated power off due to high temperature interlock
• One UXC access was needed because the A3050 had lost communication due to the brutal switch off following the power cut. Was fixed by extracting and reinserting the module
• Vcon error on YB+2 MB3S12 only a modest temperature increase (but not the first time)
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MC OFF (May 24 @ 22:20)°C
June 7, Temperature jumped to 37 °C
°C
MC OFF (June15 @ 22:16)
MC OFF (June25 @ 07:12)
YB-1 MB1, MB2 S12 LV Supply
• The A3050 switched OFF the MC on a high temperature interlock on May 24 ( 64°C), June 15(66°C) and June 25 (72°C)
• The first two instances were recovered quickly
• On June 25 , switching ON the MB1 MC caused again the interlock.
• The rest of the fill was taken with MB1 S12 MC off
• After the beams were dumped, ~13:20, the MB1 went ON, but we decided to replace the A3050
• Looking at the error messages, I discovered two additional cases on February 10 and March 10
What should we do with this module? We can send it to CAEN but I am afraid they will not be able to reproduce the problem.
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Sensors Mounted on A3100 side
Sensors mounted on cable connectors at SC sideYB-1
• Alarms started on June 24 ~13:00 as the temperature measured with V307 went above 27.7 °C
• The temperature stabilized at 29.1 °C .• In UXC It was measured at 41.5 °C • Disconnecting and reconnecting the cable brought
V307 down to 25.8 °C
• The same incident occurred on May 20
• The A3100 is in the same crate where we substituted the A3050 for MB1MB2 S12
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LV Modules Temperatures
• The available cooling power is marginal for the crates with A3100
• Check heat exchangers during next Technical Stop
• After the insertion trick the A3100 temperature dropped to 39 °C
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HV Problems
16 Channels lost
L2 16 Channels lost
16 Channels lostA876 Replaced
5 modules that failed in the detector but were OK in B904 were inserted in easy positions. OK so far
YB-1 MB2S02, switched OFF while in STANDBY
3 DT stuck/tripped due to HV Spikes on wires while at step 1
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HV Problems
In Summary:12 Chambers: 4MB1, 1MB2, 2MB3, 5MB4
6 in YB0, 2 in YB±1, 1 in YB±2
If the detector opens for the Pixels, priority to YB-2, we can recover 1 or 2 MB4
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Planned Activities During Next TS
Done
Improving the TJB grounding consists of a few steps:- Substitute plastic cover with aluminum
plate- add pigtail ground connection to TJB- close box with aluminum tape- connect ground shield on the cable with
box - wrap everything with aluminum foil…
• Reduces synchronous noise (it can’t hurt)
• It is difficult to intervene on the TJB (if needed)
• 10 TJBs to be done Make the procedure simpler
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Modified A3050s (Matteo)
• 4 Modified A3050 are in B904• Daniele will test them this Friday• We will replace modules in YB0
sectors that already gave problems:
MB1S01, MB4S02, MB2S10, MB3S04
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YB0 H20 content (ppm) from March 08 to May 31
H20 Content in peak from March 08 to June 14
Gas System• Stable situation (no changes)• H2O content increased 30%
(60% in peak) since March 8• O2 content in input lines
varies from 82 to 106 ppm and from 89 to 103! In output
• Position of O2 spikes very stable
• N2 content measured in USG on common return line but data still not summarized
It is summer, vacation time Decided with Roberto to consolidate:
- O2 analysis cells calibration- H2O station calibration (YB0)- N2 last measured
In September review some issues: Online gas chromatograph, H20 control (~400 ppm), O2 content (100 - 200 ppm)