Matteo Solfaroli (CERN), Marco Zanetti (MIT)

2010 Hardware Commissioning Overview

Outline

SD -> HWC transition What has to be commissioned RRR measurement and other special tests Schedule Shifts

From SD to HC

SD coordination will manage a given sectors up to the de-condemnation of the power converters This includes ElQA of the main circuits and cable

connection “Yellow papers” handled by SD coordination

Once in the hands of HWC coordination, the whole sector is considered ready-to-power Correctors left behind (if any) will be managed case by

case

From that moment, locking of the circuits (if ever needed) would be managed by HWC coordination

What has to be powered?

Whatever has not been commissioned to 3.5 TeV equivalent current. The list boils down to: All RQD/F and RB Very few remaining correctors

Mains: standard procedure + type tests required by nQPS

Triplets: all commissioned to 3.5 TeV but test procedure to be completed for 5 IT

Correctors: the list of circuits that follows has been obtained merging info form MP3 (Jean-Philippe, Nuria) and HWC results and confirmed by optics expert To be done in the shade of the mains, not accounting in

the time-budget

RB and RQD/F (re-)Commissioning

Extra step(energy extraction) at 4 kA

Are we going to have the calorimetric step?

Triplets

Only 5 not fully commissioned in 2009 RQX.R1 (quench heater problem) has reduced

current but still enough for 3.5 extra DCCT in triplet in R8 and L1 to measure the

individual currents

Correctors

  Status can/should be powered

RU.L4powered up to 400 A, full commissioning procedure needed YES

RU.R4 boil-off done and being analyzed YES

RCBXH3.L5PC problem, to be investigated and then commissioned YES

RCO.A78B2 non-conform (Chamonix 2009), can not be powered NO

RCO.A81B1 ready to be commissioned YES

RCO.A81B2 Open circuit, cannot be used NO

RQS.R3B1 non existing NO

RCBH31.R7B1 ElQA issue (too resistive) NO

RCBCHS5.L8B1 warm magnet instead NO

RCBCV10.R4B2 resistance at the limit, PNO.a1 to be repeated YES

RCBYV5.L4B2non-training quench around 63 A. I_PNO could be reduced YES

RCOSX3.L1 ElQA non conformity NO

RCSSX3.L1 Several trips at 63 A. Analysis ongoing YES

Circuits not fully commissioned from the list in the HWC commissioning web page

Correctors

Circuits fully commissioned but that we may consider to (partially) re-commission

  Status

RQTL9.R3B2commissioned to 400 A. Nuria proposes to push it to 550 A (PC problem?)

RQT13.R8B1commissioned to 400 A. Nuria proposes to push it to 550 A (PC problem?)

RQT13.L5B1commissioned to 400 A. Nuria proposes to push it to 550 A (QPS problem?)

RQT13.R5B2 quench during operations, to be looked at

RQTL11.R2B2cryo valves issue. Special test after exchange?

The remaining circuits commissioned with reduced parameters are fine for 3.5 TeV operations

RRR measurement test (MK&BF)

Idea: measure resistance of some busbars by means of nQPS injecting low current at higher temperature

3 controllable power converters in parallel with main PC Dipoles: 10A-300V Quads: 10A-10V

Voltage measurements done using nQPS in logging mode

Temperature should rise to at least 10K. Logging via the available sensors

The duration of the test will be as long as cryo needs to raise to ˜10K (2 days?) and back down again (2 days?) Test to be performed as soon as nQPS is qualified and phase I

is done The suggested place is sec 81:

Pros: first coming available (no impact on the schedule), the only one with all the T sensors installed

Contras: no warm temperature measurement available

Motivation: The value of RRR has direct impact on the energy the LHC can safely run at

PGC

All steps to be done in all sectors (reminder: at this stage we have an heater-provoked quench on MB at high current)

To be done after finishing the tests on the individual circuits

As last year, transition phase between HWC and operations. Some contingency in the schedule

Schedule

Shifts

2 shifts mode as soon as powering tests start (Thursday)

Weekend shifts since the beginning (BUT for next Sunday)

Night shifts starting on January 27 Shifts during conferences:

Evian: 2 “extended” day shifts (MZ as EiC) Chamonix (25 and 26 Jan): either only 1 shift per day

and/or days devoted to accesses and software updates

Access shift: QPS-cable shift starts at 6.30, how to deal with that?

Regular MP3 shifts during phase II and I Do we need EPC shifts?

Special tests

Type test on one 120A circuit (1 whole day) by pulling cables to feed the circuit with a 600A power converter (Y.Thurel)

Other special tests: measurement of RQ current ripple voltage across switches for RB and RQF/D

Conclusions

2010 HWC campaign about to start Schedule looks sound and feature some

contingency More precise time estimation as soon as nQPS will

be set operative in the first sectors