MP3 report – week 15 6/4/2010 – 11/04/2010 9 interventions + 10A/s ramp rate testing

MP3 report – week 15 6/4/2010 – 11/04/2010

9 interventions + 10A/s ramp rate testing

MP3/QPS team in CCC

Monday Morning Meeting : 12th of April 2010


• Intervention on Monday for a RB.A78 energy extraction switch. –Micro-switch problem

• Intervention on Tuesday for a RQTD.A81B1 energy extraction switch– No real problem. Procedures updated

Extraction switches problems


Undulator trip on Tuesday.

• Trip of the RU.L4 ; slow drift of U_res ; can be included in combo rampdown-precycle and precycle subsequences when main circuits are at the lowest current


RQTD/RQTF trips from feedback

• Feedback incompatible with QPS protection

• Meeting on Friday organized by A. Siemko• A solution seems possible by changing the

time discrimination.


Ramp rate fix type test on Thursday

• Type test performed on S56; new cards installed for the EE with a delay of 400ms in the odd points and 580ms in the even points.


Ramp rate fix type test

• Successive tests with FPA via PIC at 2, 4 , 6 kA while ramping up to 10A/s no magnet triggered!

• Test successful, reverted to the old cards for operation (at 2A/s ramp rate).


MP3 issues since 6th of April 2010

• The second part of the week was remarkably quiet with very few problems– RCBXH1.R1: power cycle problem: in case

of need for a power cycle, access is needed. Will be fixed in next technical stop

– RQT13.L8B1: operational limit of 300A is not enough to squeeze in LHCb – limit changed to 352A. Medium term plan ....

MP3 report – week 15 6/4/2010 – 11/04/2010 9 interventions + 10A/s ramp rate testing

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