R.Giachino / M.Albert

Be/op 2th April 2015

LHC Machine check out

1v1

Powering Groups of Circuits

Remaining HWC tests

Wednesday

● Communication lost in XR 5● EPC piquet to check gateway for triplet L5

● Extended soft start in MKI2 & 8 successfullyNormal soft start in MKI2 & 8 with sequencer tasks successfullyTo be done: – Pulse the MKI2 & 8 in injection test mode. For this we need to be at 450

GeV, so we need to wait until the four sectors are at injection

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UL55 : Overheating ERD1/56 bus bars

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Démonter la partie des jeux de barres endommagés ;Meuler un jeu de barre pour qu’il retrouve sa planéité (pour une surface de contact pleine et franche) ; Façonner une pièce d’adaptation si nécessaire (découpe, pliage, perçage) ;Nettoyer les jeux de barres et le tableau ;Remonter les parties ayant été démontées et réparées ;Effectuer une campagne complète de serrage sur l’ensemble du tableau ;Effectuer une test d’isolement, puis mis en service.Plan to be finished late afternoon-evening. henry.de-maynard@cern.ch

problem 400 V (ERD1/56 ) TE/EPC in UL 55 - A bus-bar in an electrical switch board that has melted partially around a connection bolt.

La partie endommagée est dû à un échauffement sur un jeu de barres en cuivre : deux pièces n’étaient plus en contact, et seul la boulonnerie assurait la passage du courant ; Lors de la mise sous tension d’un départ TE/EPC aujourd’hui, la planéité entre deux barres n’étant plus assurée, le défaut s’est révélé ;

UL55 : Overheating ERD1/56 bus bars

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UL55 : Overheating ERD1/56 bus bars

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UL55 : Overheating ERD1/56 bus bars

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RB.A34 &RB.A67 ● Training quench RB.A34 at 11060.99 A (6.55 TeV).

Frist magnet that quenched A17.L4Followed by: B17.L4, A17.L4, A16.L4

● 23:13 RB.A67 quench during a trim to 11038.55 A for the BETS test.Cell C31.L7, Looks like a training quench– Zinur will analyze tomorrow morning

● RB.A34 quench 1 minutes after Flat top– B8L4 and C8L4 -> propagate to A9L4

11080 A -> 6.55TeV

RB.A34 during quench at 3.5 KA

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Wednesday

● RCO &RCD’s 34 OK● QPS threshold changed on RQT13/RQ6.R7, tested OK● RB.A78 re-qualified● RB.A34 re-qualified after earth fault in progress● PIC-BIC only 4/5 circuits missing (in IP4)● RD34 and RMSI powered to nominal, no problem appeared● Ted’s Downstream moving IN /OUT

– We call Mathieu Donze. TED are not moving.– Fault TED Watching dog time

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6 sectors ramped no trips

Wednesday

● LHC closed● Check the EIS and MSI ok● Check BIS inputs from access & ASB. OK● SIS interlock surveying the access is not OK

– to be fixed (but not critical)

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BETS @6.5 TeV

● BETS tracking reached correctly 6.5 TeV

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- Both LBDS successfully ramped up to 6.5 TeV (RB45, RB56, RB67, RB78, Q4, MSD, MKD and MKB)- BEM interlocks OK for RB45 UP, RB45 DW, RB56 UP, RB56 DW, RB67 UP and RB67 DW- BEM interlocks for RB78 not tested due to trip of sector 67.- BEI interlocks OK for RQ4.B1 DW, RQ4.B2 DW, RMSD.B1 DW and RMSD.B2 DW- BEI interlocks NOT_OK for RQ4.B1 UP, RQ4.B2 UP, RMSD.B1 UP and RMSD.B2 UP- BEI tables clamped at 6.5 TeV. New tables for an energy up to 6.6 TeV to be generated and downloaded.

Detailed data available in TE-ABT elogbook.

Tentative plan

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Access requests

WHO WHERE WHEN WHAT Duration

LBDS Point 6 Q4 MSD Bets table update 1 hr.

EN/EL Point 5 ERD Repair 5-8 hrs.

Plan of the day• Access 10:00 – 17:00• EN/EL intervention on ERD1/56 in point 5

• Repeat tests BETS tests at 6.5 TeV • Tentative to close Beam Interlock Loop• Vacuum valves open• Remaining PIC- BIS test • SPS Beam on Extraction TED.• Nominal sequence tests• Precycle, ramp and squeeze all sectors• RF -Collimator • LHC & Experiments closed after access

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https://indico.cern.ch/category/6386/

Tentative plan

● Friday Sector 34 circuits operational – (If no problems encountered)

● Beam loop closing. (tonight)● BIS machine protection tests.● LBDS –BIS machine protection tests ● BIS Interlock valves (Tonight or Friday)● All Machine cycling all sectors together● First beam not before Easter…

● Checking Experts availability during Easter week end!!

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Wednesday

Exception when starting MKISSon MKI-8 from application

MKISS however worked=> Expert informed

MKI

Summary of MKI test:

• Extended softstart in MKI2 & 8 - OK• Normal softstart in MKI2 & 8 with sequencer tasks - OK• To be done:

pulse MKI2 & 8 in injection test mode=> need to be at 450 GeV, i.e. need 4 sectors at injection

• Switching ON kickers with nominal sequence throws exception=> MKI settings are now NON MULTIPLEXED, so task has to be changed

RF

● RF trip >> Problem fixed during the morning.– ACSLine8B2

ACSLine6B2ACSLine5B2

● Task to switch Rf Low level OFF and ON.when switching ON, the RF low level of line 5 B2 stays OFF(EXTRN RF VETO)

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Wednesday

• Testing circuits in S34, except RB,RQF,RQD, RD34:Set to injection level OK

• 8:23 all sectors set to injection level• Sequencer tasks fixed:• SET EVENT GROUP

• eLOGBOOK COMMUNICATION• Extended MKISS on MKI-2

Energy

● Reference energy correct! as we have ramped 56 and 67● SIS energy tracking at 6.5 TeV for Q4 & MSD● Reception of all energies of the BLMs by the SIS is OK !

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Tuesday

• RQ6.R4B1 replaced and working correctly now(tripped on Monday evening on VS STATE fault)

• Intervention on RCBV4.R6B2 – OK• First training quench on RCD/O in S34

RCO.A34B1/2 RCD.A34B1/2

Tuesday – cycling

• Ramp of 7 sector w/o RCSX3.R1 and RB.A78• Trip of RQ5.R1B1/2

Tuesday – cycling

• BLM sanity check OK• BLM signals @ 6.5TeV look OK• Sequencer to e-logbook link broken – issue reported• Another ramp of 7 sectors in the evening: NO trips !

Collimators – mp tests

GV repeated all MP tests with updated software functionality showing the difference between LVDT and motor

=> no issues found, all OK

Collimators – test of new sequences

Various issues found:

• Check Beta* limits for TCTs fails• Load collimator settings to injection failed for TCT in IP2/IP8• Load collimator position thresholds fails• Check of collimator injection settings fails for TCDQ, thresholds

and TCTs in IP2/8• Ramped all UP and DOWN, left them at PARKING

Feedbacks

• Feedbacks @ wrong energy: OFC uses 480 GeV instead of 6.5 TeV.=> to be fixed !pattern of CODs read back from the FGCs are correct, but due to the wrong E, kicks are off by a factor 13 !

• Tests of orbit feedback:Kick differences in H/V plane between OFC and LSA – OK2 outliers: MCBX.3L8.B1 and MCBCH.B5L8.B1MCBX.3L8: sign error (in LSA: POSITIVE for NEGATIVE kick)MCBCH.B5L8.B1: not present in run1, but fixed for run2 - suspicion that a configuration is wrong in the OFC since the OFB sees it as '0‘

Last night – cycling

RAMPDOWN – RAMP – MEDIUM Beta UNSQUEEZE 19/30m + 2h @ FT

7 sectors - all OK !

setting PC-FGC event groupfrom sequencer doesn't work

Remaining issues

• Vacuum valve MSI-TI2 (VVGS.29528) interlock SPS EXT1 master BIC• to be tested extraction conditions established >> Markus - BIC

• LHC probe beam re-phasing issues, stability issues => often BQM interlocks• Threshold increased, to be checked with beam

• BTVDD image orientation > on hold until LBDS experts decide on preference• BI-ABT decision to be made >> Jan -BI

• Controls: • CMW/RDA issue affecting several clients new libraries released • CIBDS problem while arming LBDS > Bruno, ongoing• LBDS-XPOC: Missing BI data: (BCTFR, BSRA, etc..) >> Nicolas M- BI

Test to be done BIS LOOP closed

● Vacuum valves test with BIS loop closed● LBDS BETS with 45 finished● Circulate and Dump

Monday – cycling & PGCs

• RQ6.R4B1 tripped • EPC >> RQ6.R4B1 ok now.• RCBV4.R6B2 available again • RQD.A45 tripped while going to STANDBY

fault: VS_RUN_TO, OK after reset• RQD/F.A78: I_MEAS fault => EPC needs to check it

BPM

• LHC SEQ: BPMLHC calibration finished. Overall result: ERRORFailed devices:

LHC.BPMSI.A4L6.B2LHC.BPMSI.A4R6.B1LHC.BPMSX.A4L6.B1LHC.BPMSX.A4R6.B2

Electrical problem @ P5

• There is a busbar in an electrical switch board that has melted partially around a connection bolt. A specialist from EPC will go in to have a look and estimate the amount of work to repair it. As it

looks now the repair will not be finished today

LHC closure test

• Switched EIS elements ON and powered to nominal while the machine was closed for 20 min.• Everything worked well !

• Trip in the end, because LHC access key was moved to avoid activating RP VETOs

HWC tests

Combined powering of RCO/D.A34B2 to I_NOM + I_DELTA - OK

PLEP to +I_NOM and -I_NOM on:RQT13.R7B1 OKRQT13.R7B2 OKRQ6.R7.B1 OKRQ6.R7.B2 OK

Training Quench RB.A34

11061 A / 6.55 TeV

First magnet that quenched: A17.L4Followed by: B17.L4, A17.L4, A16.L4

Tmax: 23.67K

BETS test @ 6.5 TeV

BETS tracking reached 6.5 TeV

BETS test @ 6.5 TeV

• Both LBDS successfully ramped up to 6.5 TeV(RB45, RB56, RB67, RB78, Q4, MSD, MKD and MKB)

• BEM interlocks OK for RB45 UP, RB45 DW, RB56 UP, RB56 DW, RB67 UP and RB67 DW

• BEM interlocks for RB78 not tested due to trip of S67• BEI interlocks OK for RQ4.B1 DW, RQ4.B2 DW, RMSD.B1 DW

and RMSD.B2 DW• BEI interlocks NOT OK for:

RQ4.B1 UP, RQ4.B2 UP, RMSD.B1 UP and RMSD.B2 UP• BEI tables clamped at 6.5 TeV

=> New tables for energy up to 6.6 TeV to be generated and downloaded.

RB.A67 trip during BETS test

• RB.67 tripped during a trim to 11038.55 A for BETS testQuench: cell C31.L7 , magnet C30L7

T up to 24.3K

• => estimate: 7 h to recover cryogenics conditions

Check list before beam

● Close all hidden doors ● TED’s are Blocked

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