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MP3 Meeting
Description
MP3-QPS CCC team weekly meeting
MP3 Meeting (07 Apr 2010)
Chaired by: Catalan Lasheras, Nuria
Present : S Le Naour, M Zerlauth, B Auchmann, A Siemko, M Koratzinos, Z Charifoulline, R Denz, A Verweij, M Solfaroli, N Catalan, JPh Tock
RQF/RQD mysterious trips
Markus showed presentation of Tuesday 6/4/2010 morning meeting.
Reiner: Suspicion of a real problem; to be checked during access for crates containing plugs (look for badly soldered joint) or having a circuit board instead of plug that would not be seen. About 11 crates to be checked. This has to be checked during tomorrow's technical stop.
RQTF/RQTD Threshold change and feedback trips
See slide from Reiner
It seems that the rate of change required for the active feedback was not specified by ABP so was not taken into account for the specification and the commissioning of the circuits. There is a discussion about the real need for the tune feedback with the present parameters, especially because it is sometimes switched off at flat top. This has to be clarified by ABP because another solution could be to reduce the speed of the tune feedback system.
The threshold criticality has to be revisited/recalculated by Arjan with input from Nuria on the maximum splice resistance measured during HC.
Ramp rate tests for April 8th
As resources are limited, can we afford to implement cards for tests ?
Delays are different in odd and even points : the goal is to separate the opening of the 2 switches to be able to decouple and avoid interferences between the 2 openings.
Programme presented by M Solfaroli
The test @ 0 A (#3) should be the first one.
A test has to be added after reinstallation of old cards before releasing the circuit.
Analysis to be done by the MP3 shifters.
AOB
* Undulator: can we reset it when current is in the circuit?
Trip because was not reset.
Reiner remarked that U_diff needs also to be checked to be sure that the drift is not coming from the circuit itself.
Undulator can be resetted at any stable current but not with beam with a very low risk of trip.
* RCO power converter: status
Power converters will be changed tormorrow (Mail from Valerie to Nuria)
First to change the power module (8/04
* List of QPS threshold values and exceptions: B26L1_10_B and B32L8_4_A
Nominal cases in : https://espace.cern.ch/mp3/Shared%20Documents/Documentation/thresholds_diagnostics_resetting_qps_user_manual_chapter_11.pdf
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