MP3 Meeting

Wednesday 28 Jul 2010, 10:00 → 12:30 Europe/Zurich

874/1-011 (CERN)

Slides

• MP3on28July2010.pdf
• MP3on28July2010.pptx
• Powering_events_in_PM-Update-July-2010.pdf
• Powering_events_in_PM-Update-July-2010.ppt
• Q10_upgrade.pdf
• Q10_upgrade.pptx

MP3 Meeting (28 Jul 2010)

Present: J-Ph. Tock, A. Musso, S. Le Naour, M. Zerlauth, N. Catalan Lasheras, A. Verweij, K. Dahlerup-Pettersen, A. Gorzawski

General information: N. Catalan

General information: N. Catalan
New operation support and shift planning. Nuria presented the shift planning (visible in \\cern.ch\dfs\Users\c\catalan\Public\MP3\MP3QPS_Shifts.xls). Duty on orange means on call service from 19:00 to 7:00 and weekends around the clock. Green duty consist on call service from 07:00 to 19:00 during weekdays. The person in day/weekday service assists to the 8:30 meetings. The person in night/weekends assists to the 9:00 meetings in the weekend if any. Modalities of compensation and if the service will be on piquet or in a best effort basis are not yet discussed with the management but it seems reasonable that interventions as well as the assistance to the weekend meetings shall be compensated. Nuria will prepare a presentation for LMC and clarify the operation principle. As the mandate of the team has not changed, it is clear that the change of operation mode does not imply a reduction of the time dedicated to MP3.

As a follow up of the last meeting and the discussion on hardware commissioning preparations, each member of the team will be assigned to a particular type of circuits:

• 13 kA circuits RB and RQ: A. Verweij and M. Koratzinos
• IPQs: N. Catalan and M. Modena
• IPDs: J-PH. Tock and R. Denz
• IT: B. Auchmann and N. Catalan
• 600A: M. Zerlauth and S. Le Naour
• Orbit correctors: G. D'Angelo and A. Musso

The task will be to re-write the procedures when needed, define the degree of re-commissioning needed after an intervention and identify the tests required before the end of the run in 2011. The commissioning of the QPS and nQPS with current will need to be added to the procedures for 13kA circuits and IPQs and IPDs after their upgrade.

Q10 magnets K. Dalherup

Knud explained that, after a request of the EEWG, the voltage range in U_1 and U_2 was increased to  180V compared with the nominal 10V (and 40V in the IT). The aim of the modification was to be able to measure the voltages without saturation even during a fault. This high voltage has two clear drawbacks: the high sensitivity to noise inside the detector and the poor resolution for the detection signals. Going back to the nominal values of 10V will demand a small change to the hardware (removing two resistors in the board) and updating the firmware. This could be done in the tunnel or in the lab rotating the few spare cards available.

It is recommended by MP3 to test the changes in the QPS lab and, if proven successful, to  prepare some cards to make the change in Q10 and Q9 of two sectors already in the next technical stop at the end of August. The proposal is to do it in R4 and L1 in order to coincide with the PXI system connections and minimize the number of circuits that need to be partially re-commissioned.

The two events from yesterday in which RQ6.R1 and RQ9.R2 trigger on noise discharging the heaters are still not understood. What seems a voltage spike (positive and negative wave) reaches -100mV enough time to trigger the QPS. No other perturbations were seen in the tunnel and the event can not be correlated to beam either. Increasing the resolution in U_1 and U_2 will certainly help to see clear in the event of future failures.

Update on automatic analysis tools M. Zerlauth.

Markus showed the first modules of what will become the automatic analysis of powering events. the 1st release of it will come by the end of August. He also showed a demo of what it will become. All members are invited to use it in playback mode already available and give feedback to Markus.