M.Pojer/M.Solfaroli

Preparation for2011 HWCcampaign

BCWG - 16/11/2010 2

Content

• WHY do we need a HW Commissioning campaign?

• WHAT are we going to do?

• HOW are we going to do it?

• ElQA

• QPS

• Powering Tests

• Planning (draft)

• Overlook (4TeV)

• Miscellaneous

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WHY

• Lots of activities will be performed in the LHC underground

• Activities cannot be fully controlled• We cannot ensure a 100% correctly functioning

machine protection system

• Cryogenic intervention:• Warming up of the arc magnets below 80 K• DFBs will warm up above 80 K (as already

happened in short technical stops)

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WHAT

• Assume operation at 3.5 TeV• Monitoring of electrical integrity of some circuits (high

current circuits of the arc and spool pieces) during warm-up and cool-down will be installed

• ELQA will be performed ONLY for the circuits with a current above 600A

• QPS – QH firing (scheduled once per year): as risk of damage during the test is higher than risk of failure when needed (redundancy of quench heaters and very limited number of beam induced quenches), heater firing tests ONLY for magnets whose cables are disconnected– no systematic heater firing for MB and for MQ magnets

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WHAT

• Circuit protection requires correct operation of the interlocks (QPS, PIC, PC) and EE --> Almost all tests to verify the correct functioning of interlocks will be performed

• Reduced number of other tests, according to expert requirements

• Heat run for all circuits will be performed (8hours) as last step

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HOW - ElQA

The ElQA team and equipment:• Equipment for testing up to 4 sectors in parallel

• 5 teams available inside the ElQA team (2 teams per

sector + 1 (per MIC) needed) –> up to 2 sectors in

parallel

NEEDS (for one sector)• 2 teams for HV ElQA

• 1 team for MICM.Pojer/M.Solfaroli

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• Snubber capacitors: Installed only for RB circuits– ONLY ONE SECTOR will be connected for testing

(assuming re-commissioning to 3.5TeV)– ELQA to be done (separately)

• Old global main bus-bar detector taken out in all sectors• Quench heater power supplies switches:

– test during switch off to identify weak switches• Test of the third (Z) switch of 600 A citrcuits (within test

step of HC)• Upgrade all Q9 and Q10 voltage divider (Q10 R2 done) –

test within the normal HWC sequence

HOW - QPS

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HOW - PTs

Simplification of test execution:

• Excluding high current tests (RB, RQD) a test step with

same current level can be done before the previous test

step is signed

• Signature of tests to be cleaned up (not required that

several teams sign the same test)

• Parallel tests of several circuits - Global Power Abort will

be disabled (re-enabled after the tests)

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HOW - PTs

Circuit type Test Estimation

RB(8)

PIC2 ~30 min

5/8 PIC tests4/13 other tests(+2 if 4TeV)

PLI1.d2 Unipolar Powering Failure ~10min

PLI2.b2 Energy Extraction from QPS I_Interm_1 ~20min

PLI3.d2 Unipolar Powering Failure ~15min

PNO.b2 Energy Extraction from QPS ~30min

RQD/F(16)

PIC2 ~30 min (per circuit)

5/8 PIC tests2/12 other tests

PLI2.b3 Energy Extraction from QPS 13kA ~20min

PNO.b3 Energy Extraction from QPS 13kA ~30min

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HOW - PTs

Circuit type Sector Estimation

IPQs(78)

PIC2 ~15min 3/6 PIC tests1/7 other tests (+ PNO.a7)PNO.c3 Fast Power Abort IPQ ~35min

IT(8)

PIC2 ~20min 3/6 PIC tests2/16 other testsPNO.d12 PC Failure at +10% of PNO ~10min

PNO.d13 PC Failure at -10% of PNO ~10min

IPD(16)

PIC2 ~15min 3/6 PIC tests2/4 other testsPNO.c2 Fast Power Abort IPD ~20min

600A EE(202)

PIC2 ~10min

3/6 PIC tests2/6 other tests

PLI3.b1 Energy Extraction from QPS 600A ~5min

PNO.d3 Bipolar Powering Failure 600A ~15min

600A no EE(72)

PIC2 ~10min 3/6 PIC tests1/4 other testsPNO.d3 Bipolar Powering Failure 600A ~15min

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HOW - PTs

Circuit type Sector Estimatio

n600A no EE crow

(136)

PIC2 ~10min 3/6 PIC tests1/4 other testsPNO.d3 Bipolar Powering

Failure 600A ~15min

80 – 120A(284)

PIC2 ~2min 1/3 PIC tests1/4 other testsPNO.d1 Bipolar Powering

Failure ~10min

60A(752)

PNO.d1 Bipolar Powering Failure ~10min 1/3 other tests

TOT

1792/3672 PIC tests - 49%1690/5878 other tests - 29%(of course including the 60A)…+8h Heat run and GPM check

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Cryo Maintains

CRYO maintain@1.9K Sector

19/01 56

20/01 67

22/01 78

26/01 34 – 81

27/01 12 – 45

01/02 23

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DSO tests

2 shifts – 13h7am - 8pm

3 shifts7/7 days

3 shifts7/7 days

3 shifts7/7 days

First sector inPhase I powering

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Overlook - 4TeV

4 TeV considerations: We don’t expect a significant delay

• Current in RB: 6770 A instead of 5925 A (1 more step)• Values for current in corrector magnets (M.Giovannozzi)

• QPS rating might need to be reviewed• Snubber capacitors:

• needed for RB (to be connected)• to be clarified for RQD/F

• RQX.R1 – voltage reduction• Symm nQPS threshold (800 mV) to be lowered?• dI/dt: RB time constant to be increased to 68 s• RB.A78 high voltage tested only to 1.6 kV - to be confirmed• Splice safety to be confirmed by ongoing simulations

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MISCELLANOUS

• RRR measurements• Simulation validation tests• Re-test of circuits where PC replaced• Inner Triplet tests: PC trips when power permit

removed• Some special test for selected circuit (refer to MP3)• Snubber caps: Energy extraction at different current

levels (0.76-2-4-6 kA)

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CONCLUSIONS

• We are confident that HWC will be short and quick– All SW already used– No heavy modification on circuits– No mayor modification on procedure– Strongly reduced number of tests

• Possible commissioning to 4 TeV wouldn’t take much– Studies on technical showstopper ongoing

• Difficulties in finding people to cover the shifts could slow down the commissioning time

• LHC should be ready for operation by 18 Feb.

M.Pojer/M.Solfaroli