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MPP meeting
General information
Powering tests re-starting in 5-6.ElQA
ElQA has proposed modifying the program of electrical tests for the arc circuits. It will allow to do the low voltage tests at higher temperature. The cryogenic conditions need to be stable anywhere below 4.5K. It is also proposed to withdraw the systematic transfer function measurements in the arc 60 A dipole correctors. There has never be a problem for this circuits in sector 7-8 and 4-5. On the other hand, PO uses standard parameters for their control and ,if needed, can measure the transfer function from the power converter. This test will be kept for the DS and LSS orbit correctors. MPP endorses both proposals. A written proposal will be circulated by D. Bozzini.Procedures
The procedures are being modified to include the changes discussed during the hardware commissioning review. All procedures will be numbered as version 1.0. The off-line analysis clearly stating which team does the analysis will be moved to appear right after the steps.- RB and RQF/RQD will be distributed this afternoon. A. Verweij pointed out that the data to be stored after the off-line analysis is not yet in MTF for sector 4-5.
- 600 A procedure is finished. W. Venturini is working on the definition of he automatic analysis.
- 60, 80 and 120 A correctors procedures stay like they are but the tolerance ranges are being modified this week based on more statistics. Part of the problem is the accuracy of the measurements on the warm part of the circuit. A more precise measurement could be added to ElQA easily.
- IPQ delta files are send to CO to modify the sequencer. The procedure will be ready this week.
- IPD delta file are sent to CO. Procedure will be ready next Tuesday.
- IT procedures are progressing. A draft without the off-line analysis will be circulated by the end of this week or on Monday. The sequencer will not be ready for these tests and the tests will have to be launched manually.
- IT correctors new procedure. Needs to be added to the general list of procedures. The editor will contact people who should define tests and powering cycles (Action:W. Venturini Delsolaro).
Release of DFB and stand-alone magnets
J. Casas Cubillos showed that the natural boi-off tests of Q5.L6 and Q4.L6 have the same slope as expected (same magnet). The boil-off test with an additional electrical heater failed for Q4.L6. The data for Q5.L6 was compared to Q6.R4 and also present the same slope and range. No oscillations of the level gage are observed for this magnet. As Q6R4 profile was previously understood, Q5.L6 and by extension Q4.L6 levels are assumed to be correct. Both stand-alone magnets can be released. MPP requires a procedure describing how to release the stand-alone magnets from CPP or CRG. D. Bozzini pointed out that the formal release of the DFBs, level gages and temperature sensors should be a single step by CRG.The level reading in the cryostat Q4/D2.R5 is correct and needs only to be documented before release. In Q5.R5 oscillations on the level are observed and the magnet can only be filled to 42%. The Q6R5 filling valve is also causing problems. Both problems are under investigation.
B. Bellesia asked if the same procedures will need to be applied prior to recommissioning sector 4-5. J. Casas Cubillos replied that a fill-up and boil-off should be sufficient to check the previous levels.
ROTA pland for MPP-CCC team
N. Catalan Lasheras presented a tentative plan for shifts of the MPP CCC team. As the team will work in staggered hours, the members of the team are asked to verify their availability and decide on morning or afternoon shift. Besides the seven members already active in sector 4-5, two new members (M. Bajko and V. Remondino) will be trained during the powering of 5-6.17 March 2008. N. Catalan Lasheras
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