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MPP meeting
MPP meeting (16 Jul 2008)
Present: Boris Bellesia; Nuria Catalan Lasheras; Zinur Charifoulline; Giorgio D'Angelo; Reiner Denz; Carlos Fernandez Robles; Mike Koratzinos; Sandrine Le Naour; Karl Hubert Mess; Michele Modena; Andrea Musso; Mirko Pojer; Roberto Saban; Rüdiger Schmidt; Hugues Thiesen: Jean-Philippe Tock; Walter Venturini Delsolaro; Rob Wolf
Chaired by: Rob Wolf
During the consolidation of the sector, the main circuits and spool pieces in the arc and all the circuits in the Q5/D4 cryostat were affected. Software updates were applied to FGC,PIC and QPS systems.
It is proposed to re-do completely ElQA, QPS IST tests and PIC and PCC for all circuits. PLI and PNO steps may be skipped in a circuit by circuit case. The commissioning should follow the newests powering procedures.
It is recommended to go directly for nominal current for all IPQ/IPD circuits and repeat PCS for the spool pieces.
G. D'Angelo objected that the planning for ElQA tests may not be compatible with the available resources. The qualification of the inner triplet circuits should be re-scheduled.
MPP will generate a single document for the re-commissioning of the sector based on the current procedures. For each test it wil be specified if it has to be canceled. It will then be sent around for comments and approval. This will then be propagated to the sequencer and MTF.
To date, 57000 variables have been already stored in MTF. Data stored on-line by the sequencer or the Post-Mortem system is already in MTF with 99.8% and 97% efficiency. For MPP, no data has been filled up to now out of the 2700 variable data already measured. The MTF and CO teams can provide tools to automatically store the data.
MPP should define the team who has to fill the properties.
It is suggested to do two tests at different currents as part of the standard procedure. The test for sector 2-3 wil be done as the next step manually.
1.
2.
It is not clear if the heat propagation is also symmetric in the up-down direction. To clarify that, a test is proposed where a scope is connected to the up-down voltage taps of a magnet and a quench is provocked in the neibouhring magnet.
R. Schmidt informed that before the beam screen temperature in and out of the beam screen is included in the CRYO_MAINTAIN and CRYO_START signals, 120 A may be powered up to 10 A without risk for the current leads. This allows to do the PIC and PCC tests in parallel with the other activities.
Present: Boris Bellesia; Nuria Catalan Lasheras; Zinur Charifoulline; Giorgio D'Angelo; Reiner Denz; Carlos Fernandez Robles; Mike Koratzinos; Sandrine Le Naour; Karl Hubert Mess; Michele Modena; Andrea Musso; Mirko Pojer; Roberto Saban; Rüdiger Schmidt; Hugues Thiesen: Jean-Philippe Tock; Walter Venturini Delsolaro; Rob Wolf
Chaired by: Rob Wolf
Recommissioning proposal for 4-5
B. Bellesia presented what was done when commissioning sector 4-5 last winter.During the consolidation of the sector, the main circuits and spool pieces in the arc and all the circuits in the Q5/D4 cryostat were affected. Software updates were applied to FGC,PIC and QPS systems.
It is proposed to re-do completely ElQA, QPS IST tests and PIC and PCC for all circuits. PLI and PNO steps may be skipped in a circuit by circuit case. The commissioning should follow the newests powering procedures.
It is recommended to go directly for nominal current for all IPQ/IPD circuits and repeat PCS for the spool pieces.
G. D'Angelo objected that the planning for ElQA tests may not be compatible with the available resources. The qualification of the inner triplet circuits should be re-scheduled.
MPP will generate a single document for the re-commissioning of the sector based on the current procedures. For each test it wil be specified if it has to be canceled. It will then be sent around for comments and approval. This will then be propagated to the sequencer and MTF.
History of 3208
A. Musso reported on the repair undergone by magnet MB3208. This magnet showed a poor quench performance and was sent back to Noell where it was dismantled. The inner layer of aperture 1 was found damaged and was completely replaced. All quench heaters were changed before recollaring. All electrical connections were also re-done.The magnet came back to CERN and was renamed 3708. It was tested successfully in SM18. G. D'Angelo confirmed that in this case, the reflectometry indicates that the quench heater is open right under the IFS flange as for the more recent case in sector 2-3.Report on MTF properties for the HCC
M. Koratzinos made an inventory of the variables stored on MTF for the hardware commissioning. These variables are specified in the powering procedures and can be stored at every iteration of the test. All the instances can be found in a database external to MTF but they can be retrieved from the standard MTF web.To date, 57000 variables have been already stored in MTF. Data stored on-line by the sequencer or the Post-Mortem system is already in MTF with 99.8% and 97% efficiency. For MPP, no data has been filled up to now out of the 2700 variable data already measured. The MTF and CO teams can provide tools to automatically store the data.
MPP should define the team who has to fill the properties.
A tool for global observation of unbalances in the quench signals during fast discharge
Z. Charifoulline presented the procedure and results for the tests performed in sector 7-8 to detect dipoles with a large imbalance between apertures. The test consists on ramping to a defined current., trigger the buffer filling in all dipoles, and open the switches within 13s. The PM data is then collected and analysed. The test uses already existing tools. The test was done at 2, 3 ,5 ,and 7.5 kA Ten magnets suspicious have a large unbalance that may trigger the QPS detector without being a real quench. Among them, the higher unbalance is seen in the B30R7 (after correction of the data for amplification factor)It is suggested to do two tests at different currents as part of the standard procedure. The test for sector 2-3 wil be done as the next step manually.
Update on the detection of symmetric quenches
R. Denz reported on the two solutions currently discussed to detect a very symmetric quench caused by heat propagation.1.
2.
It is not clear if the heat propagation is also symmetric in the up-down direction. To clarify that, a test is proposed where a scope is connected to the up-down voltage taps of a magnet and a quench is provocked in the neibouhring magnet.
AOB
It was decided that for the 600 A circuits, the powering will start for each sector with an acceleration of 0.1A/s2 and a ramp rate of 1 A.s. The powering will proceed up to and including the first step at PNO. The QPS team will the correct systematically the ramp compensation using the recorded data. The acceleration and ramp rate parameters will be then updated to the values requested by AB/ABP. The remaining steps at nominal current will be done with this parameters.R. Schmidt informed that before the beam screen temperature in and out of the beam screen is included in the CRYO_MAINTAIN and CRYO_START signals, 120 A may be powered up to 10 A without risk for the current leads. This allows to do the PIC and PCC tests in parallel with the other activities.
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