17/06/2008 LHCCWG

Sector 56 – status

Gianluigi for the Machine Check-Out Team

(Mike, Reyes, Rossano, LHC-EICs/OP, Mirko)

17/06/2008 LHCCWG

Status of Sector 56

• Got the sector on Wednesday afternoon after:– Quench at 2 kA of the magnet– Ramp to nominal current of the RBs

• At present all power converters/circuits available except:– Triplet Correctors, RTQX1, RMSD (this

should be available this afternoon)

17/06/2008 LHCCWG

Activities• Activities ongoing in the Sector last week during mornings (Mirko):

– Alignment of the vacuum chambers in dump lines– Dump line vacuum– Shielding Q5 (completed)– Bake-out of CMS vacuum chamber (completed)– MSD gaussmeter (completed)– Power converter performance and debugging (corr., ROD)

• Trying to group activities next week:– Other activities for experiments (ZDC,TOTEM)– TIM installation– Power converter performance and debugging (corr., ROD)– BLM tests– Installation of protections for power converters in RR57– Clean-up of the sector– Dump line vacuum– Alignment of the vacuum chambers in dump lines– Cool-down and test of sector 56 quench lines (to P5 and to P6)– Cold Compressors recovery tests– Large Quench recovery test– ….

17/06/2008 LHCCWG

Performance 600 A• After the reload of the SW of the QPS in 56 and

discussion with HWC tested all 600 power converters up to 0.1 A/s2 and 3 A/s. Keep the best performance so far for those that passed the test.

• 7 power converters failed the test keep HWC values for the time being and passed back to HWC to test with QPS expert:– RPMBB.UA63.RSD1.A56B1– RPMBB.UA63.RSD2.A56B1– RPMBB.UA63.RSF1.A56B1– RPMBB.UA63.RSF2.A56B1– RPMBA.UA63.RQT13.L6B2– RPMBB.UA63.RCD.A56B2– RPMBA.RR57.RQTL11.R5B1

17/06/2008 LHCCWG

Performance 600 A

• Tested ramp and squeeze to 0.55 m (only point 5): – OK for the present ramp/acceleration rates, main limit

coming from Q6.R5 (Stephane trying to optimize that)• Squeeze takes a bit less than 20 mins

– To be tested with settings for simultaneous squeeze of IR1/5 variation of the strength of the RSxx doubles

– Sextupole functions for B2 to be tested– Need to verify the behaviour when stopping at

intermediate values and trimming/incorporating tune, chromaticity trims:• Say: Q=0.01, Q’=20

– Need to include ROF/D Landau octupoles

17/06/2008 LHCCWG

Alarms and SIS

• Alarms for PC/QPS/PIC available and tested– PC alarm mapping is correct but still a lot

of warnings, being addressed by PO– Reduction still to be applied when more

than one alarm Markus– Vacuum pressure alarms available– Vacuum valves alarms should be available

by Thursday– SIS: power supply status verified & OK

(except for a few power supplies not surveyed – to be followed-up with Jörg)

17/06/2008 LHCCWG

Issues so far

• Intermittent loss of 60 A Power Permit: being investigated with CO, PO and CRI

• Trips of QTL11.R5B2 when going in standby with all the power converters

• PM for some power converter signals not synchronized

• Issues for BLM and BPM front-end stability and concentrators

17/06/2008 LHCCWG

On-going

• RB-RQF-RQD synchronization• EMC measurements for

BLMs/collimators

17/06/2008 LHCCWG

To be done

– Squeeze to intermediate levels, trims and 600 A tests

– Ramp-down and pre-cycle (including octupoles)

– Injection decay and snap-back– Sequencing