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Status of Muon chambers and UF/PNPI HV-system. Outline Status of Muon chambers HV-system, status, tests and repairing of voltage sensors (VS), recalibration VS in situ, spare channels. Status of Muon chambers. M2-M5 stations 1104 Chambers are at 2,5 kV from spring 2008. - PowerPoint PPT Presentation
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23.02.09Oleg Maev 1
Status of Muon chambers and UF/PNPI HV-system.
Outline
- Status of Muon chambers
- HV-system, status, tests and repairing of voltage sensors (VS), recalibration VS in situ, spare channels.
23.02.09Oleg Maev 2
Status of Muon chambers
M2-M5 stations
1104 Chambers are at 2,5 kV
from spring 2008
23.02.09Oleg Maev 3
Status of Muon chambers
Q1:
23.02.09Oleg Maev 4
Status of Muon chambers
Q2:
23.02.09Oleg Maev 5
Status of Muon chambers
Q3:
23.02.09Oleg Maev 6
Status of Muon chambers
Q4:
23.02.09Oleg Maev 7
Status of Muon chambers
• In total from 4416 gaps 99,7 % are OK
23.02.09Oleg Maev 8
Status of Muon chambers
Last spare R4 chambers were delivered from PNPI at the end of 2008.
So we have spare:
M2R4-11 chambers
M3R4-15 chambers
M4R4-15 chambers
They passed gas leak, capacitance and integrity tests successfully and they are awaiting some components to perform final assembling and final tests.
23.02.09Oleg Maev 9
UF/PNPI HV-system
8 Master modules and 56 RDB#36 modules (960 from 1104 chambers)
Status on the end of October 2008.1. Masters work without problems after summer repair.
2. Several RDB channels had a permanent pre-trip status (I > Imax, but ttrip< 1s).
Tests of voltage sensors of RDB channels in “transparent mode”:
(HV on premier PS =2,5 kV, Vset>=2,6kV) 13&20.10.08 have shown many bad channels:
23.02.09Oleg Maev 10
UF/PNPI HV-system
Test 28.11.08 HV on premier PS =2,5 kV, Vset=2,7kV
23.02.09Oleg Maev 11
UF/PNPI HV-system
23.02.09Oleg Maev 12
UF/PNPI HV-system
23.02.09Oleg Maev 13
UF/PNPI HV-system
02.02.09Oleg Maev 14
UF/PNPI HV-system. Spare elements.
Master modules:mother board – 1
with 8 channels (repaired by Nikolay last month)
plus 8 spare channels which aren’t checked yet
RDB#36 modules:mother boards – 4
channels – 36 x 3 + 3 =111 chs
to be repaired – 45 chs
Reserve inside system: Master chs. – 8,
RDB chs. 12x8=96
Quality of them is ?
This year our understanding of system really grown up. And now, we ensure that the HV-system is working properly in acceptable and safe mode.
23.02.09Oleg Maev 15
Conclusion.1. After about half of year of system in operation we found 2,5%
unstable voltage sensors in RDB modules and approximately the same percentage of noisy (trips of channels) channels.
The reasons of bad channels are various. There is a simple mortality of electronic components and also an inconsistency of component parameters to the design requirements. Part of them have been found and partially fixed by Nikolay.
2. We are sure that the HV-system doesn’t need any global upgrades (replacing of HV-resistors etc.) or principal changes at present! We must provide just a final tuning of system and the permanent monitoring of it during operation.
3. SW for recalibration of voltage sensors in situ under preparation and Evgeny hopes to finish it before end of March. Next task is installation and debugging this SW in the PIT.
UF/PNPI HV-system