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Copper Stabilizer Continuity Measurement Project

Copper Stabilizer Continuity MeasurementStatus & Plans – May 2011

MPE-TM – 12 May 2011

M. Koratzinos, J. Steckert, H. Thiesen, A. Verweij

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Contents

• Description of CSCM tests (Arjan)

• Status and Plans (Hugues)

• mQPS (Jens)

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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 KCurrent : 4 kA – 6 kATime : 10 s – 50 sMax T : 200 K

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Interlock = protection = stop the tests at the beginning of the runaway before destroying the splice

50 mV

RB busbar20 K – 6 kA52 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

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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- Vdiode_rb # 265 V and Vdiode_rq # 90 V (Vdiode # 1.7 V @ 20 K)- Vdc_cable # 10 V @ 6 kA- Vbusbar_rb # 15 V @ 6 kA and Vbusbar_rq # 30 V @ 6 kA

280 - 290 V @ 20 K

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CSCM Tests

• Power converter resources (20K) - 2 RB bridges in series

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CSCM Tests

• RB circuit powering configuration

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RB

RB FipRB PicRB Ext

RB Earth

CSCM Tests

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RB

RQ

• RQ circuit powering configuration

RB Earth

RQ FipRQ PicRQ 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

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# 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 1st 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)

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# 7 persons during 7 days and 2 shifts (1 sector)

M = morningA = afternoonN = 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

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# 6 persons during 1 week (1 sectors) w/o powering tests

CSCM Test campaign

• Schedule:

# 10 weeks (2 sets of test boards)

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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)

# 1st RB

# 1st RQ

CSCM Test campaign

• Schedule:

# 8 weeks (3 sets of test boards)

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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)

# 1st RB

# 1st 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

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CSCM Status and Plan

• Planning:- First draft meeting: 8 June 2011- Second draft meeting: 22 June 2011- Internal review: 29 June 2011- Type test in RQ circuit: September 2011- Tests campaign: December 2011 – February 2012

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