1 Copper Stabilizer Continuity Measurement Project Copper Stabilizer Continuity Measurement Status & Plans – May 2011 MPE-TM – 12 May 2011 M. Koratzinos, J. Steckert, H. Thiesen, A. Verweij

2 Contents Description of CSCM tests (Arjan) Status and Plans (Hugues) mQPS (Jens)

3 CSCM Objectives Objectives of CSCM tests -Concerned circuits: RB, RQD and RQF -Determine the max. safe energy of LHC (4 - 5 TeV) Other limitations (LHC non conformities) -RQX.R1 -RB.A78 (B30R7) -Other limitations ? (to be defined) Assumptions -Time constants of the EE systems -4 TeV: RB = 51 s, RQ = 10 s -4.5 TeV: RB = 68 s, RQ = 15 s -5 TeV: RB = 68 s, RQ = 15 s -No defect on the diode path

CSCM Tests CSCM current cycle (see Arjan presentation) -Heat the defect to identify it (runaway) interlock Temp: 20 K Current: 4 kA – 6 kA Time: 10 s – 50 s Max T: 200 K 4 Interlock = protection =stop the tests at the beginning of the runaway before destroying the splice 50 mV RB busbar 20 K – 6 kA 52 uOhm mQPS threshold 0.2 s

CSCM Tests CSCM protection system (see Jens presentation) -3 elements have to be protected -Splice = mQPS -Diode path (or magnet) = Qsym -CL = Qcl 5 mBSQsym Qcl (CL at nominal operating conditions) 20 K

CSCM Tests Power Converters -Use the same power converters for the 3 circuits (RB) -Voltage budget (RB): -20K -V diode_rb # 265 V and V diode_rq # 90 V (V diode # K) -V dc_cable # 10 6 kA -V busbar_rb # 15 6 kA and V busbar_rq # 30 6 kA K 6

CSCM Tests Power converter resources (20K) -2 RB bridges in series 7

CSCM Tests RB circuit powering configuration 8 RB RB Fip RB Pic RB Ext RB Earth

CSCM Tests 9 RB RQ RQ circuit powering configuration RB Earth RQ Fip RQ Pic RQ Ext

CSCM Test campaign Sequence (1 sector): - Preparation: 1 week – 1 shift - QPS: 4 persons – 5 days/1shift - Disable QPHS, oQPS, Qsym and EE system - Install mQPS boards - IST of the mQPS - Cryogenic: - Empty the sector - Warm up and stabilize the sector at 20 or 40 K - PC: 2 technicians – 5 day/1shift - Modify the RB converters (2 days) - IST of PC (2 days) - PIC: - PIC tests w/o current 10 #6 persons during 1 week (1 sectors)

CSCM Test campaign Sequence (1 sector with 1 PC): - Powering tests: 7 days/2 shifts (2 weeks for the 1 st sector) - ElQA: 2 persons – 1 day (M) - RB commissioning: 4 persons – 1 day (A) (2-QPS, 1-PC, 1-Cryo) - RB tests: 4 persons – 1 day (A) - Connect the RB PC to RQD circuit: 3 persons – 1 day (M) (1-QPS, 2-PC) - RQD commissioning: 4 persons – 1 day (A) - RQD tests: 4 persons – 1 day (A) - Connect the RB PC to RQF circuit: 3 persons – 1 day (M) (1-QPS, 2-PC) - RQF commissioning: 4 persons – 1 day (A) - RQF tests: 4 persons – 1 day (A) - Data analysis: 2 persons – 5 days (M) 11 #7 persons during 7 days and 2 shifts (1 sector) M = morning A= afternoon N= night

CSCM Test campaign Sequence (1 sector): - Recovery (w/o cryo): 1 week – 1 shift - Reinstall old BS board and enable oQPS, Qsym and EE system - IST of QPS - Reconfigure the RB power converter -IST of RB power converter - ElQA - Full recommissioning of the main circuits 12 #6 persons during 1 week (1 sectors) w/o powering tests

CSCM Test campaign Schedule: # 10 weeks (2 sets of test boards) 13 Preparation = 3 persons – 5 days – 1 shift Tests = 7 persons – 7 days – 2 shifts Recovery = 3 persons – 5 days – 1 shift (w/o cryo and powering tests) # 1 st RB # 1 st RQ

CSCM Test campaign Schedule: # 8 weeks (3 sets of test boards) 14 Preparation = 3 persons – 5 days – 1 shift Tests = 7 persons – 7 days – 2 shifts Recovery = 3 persons – 5 days – 1 shift (w/o cryo and powering tests) # 1 st RB # 1 st RQ

CSCM Status and Plan Status: - Today the limits of the CSCM tests are defined - Circuits (magnet and DFB) at 20 K - Current leads at nominal operating conditions - Current cycle (4 or 6 kA) - Protection system (mBS, Qcl and Qsym) - Powering system (RB converter with both bridges in series) - Test campaign 15

CSCM Status and Plan Plans: - Next steps (end of May – beginning of June): “short document” -CSCM tests must be defined in details (cryo, DFB and CL conditions, current cycles, etc…): Arjan -Same for the protection system: Jens -Same for data measurements and analysis: Mike -Same for the other aspects (powering system, test planning, safety, risk analysis, etc…): Hugues -Same for the limits of the machine: MP3 - Next weeks -Meeting with Serge to clarify the cryo aspect -Meeting with Marta to define validation tests -Diode tests to confirm the diode threshold -Bus bar tests to validate the 20 K tests -Meeting with ElQA team to start the discussion concerning the ElQA aspect. 16

CSCM Status and Plan Plans: - Internal review end of June -Cryo system: Serge C. -DFBs and CLs: Amalia B. and Antonio P. -Magnets: -QPS: Reiner D. and Knud D.P. -Power converters: Valérie M. and Yves T. -PIC: Markus Z. -ElQA: Nuria C.L. -Planning: Katy F. -Safety: -Other: 17

CSCM Status and Plan Planning: - First draft meeting: 8 June Second draft meeting: 22 June Internal review: 29 June Type test in RQ circuit: September Tests campaign: December 2011 – February