R.Giachino / M.Albert Be/op 12th March 2012

LHC Machine check out

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Summary of week 10

Aims of the week– Finish HWC– Prepare machine for first beam

LHC 8:30 meeting

Machine checkout:R. Giachino, M.Albert and J. Wenninger

Hardware Commissioning:M. Pojer, R. Schmidt and M. Solfaroli

LHC check-out

Main targets of the week: – Finish HWC,– Close the beam interlock loop,– Test the beam dump,– Test the injection kickers,– Run the LHC through a full machine cycle,– Check the control system.

LHC 8:30 meeting

Progress : HWC & checkout

● From Monday to Friday HWC and machine checkout activities had to be performed in parallel. – Priorities were defined every day for HWC and for checkout

activities, the focus shifting from HWC to checkout along the week.

– Collaboration HWC-machine checkout, was very smooth due to a better planning of the activities.

LHC 8:30 meeting

Status of powering testsIn total, 8185 tests steps (including

preparations of powering tests) have been done

Progressive availability of cryogenic conditions

Powering status

● Heat runs: – All sectors were tested

● Pre-cycles work well.● Several full machine cycles were performed

– Without hardware powering faults. – RQT13.L8B1 increased IPNO from 400 to 450(B* .6m)

LHC 8:30 meeting

Machine cycle● HWC was completed Wednesday afternoon when the

machine was ‘handed’ over to beam operation.● The same evening, the machine was pushed through the

nominal proton cycle:– Pre-cycling of the magnets,– Injection,– Ramp,– Squeeze.

LHC 8:30 meeting

control issues were identified – have been fixed or will be fixed in the coming days.

LHC progress : beam interlock and kickers● To close the beam interlock loop requires a number of

conditions, the most difficult ones to achieve were:– LHC closed – no access (also experiments),– No powering failures,– Vacuum valves open,– BLM system operational.

>> tough constraints given parallel HWC activities.● The BIS loop was closed the first time Friday evening.● Saturday late night both dump and injection kicker systems

were pulsing.

LHC 8:30 meeting

LHC progress: LBDS & MKI tests

● BETS fully tested at 450GeV and 4GeV. ● Injection inhibitions between LBDS and MKI are OK.

● TSU clients tested:– BIS – BETS – Internal failure (frev switch off) – LBDS trigger – Circulate & dump – Inject & dump -> functionality OK issue with XPOC (see below)

● TSU synchronisation.● TSU IPOC thresholds have been adjusted.● MKI synchronisation

– checks with beam show a shift of the kick by +160ns w.r.t. beam (to be decided how to adjust it)

● Inject & dump – status is badly returned by one of the 2 CPLDs on the TSU (to be decided)

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Controls● Along the week the OP teams with support from numerous

equipment groups tested applications, front-ends, LSA core etc..

LHC 8:30 meeting

● The Vacuum system was operational on Friday evening after a big effort in point 2&8.● RF was ready to ramp for the week end.● BI was extensively tested without beam.● Collimators setting and calibration is finished.● The cryogenic system, has been stable all along the HWC. ● EN/EL, EN/CV at nominal configuration.

LHC 8:30 meeting

Injectors and transfer lines (1)● PSB started up with beam 20th February.

– LHC-indiv Lhc50 LHC-probe LHC25

● PS started up with beam 23th February.– LHC-probe, LHC-indiv.

– LHC50 12b setting up

● SPS started up with beam 25th February.– SPS aligned, probe bunch ready to be extracted to the LHC.– LHC-Indiv, LHC-probe, LHC50 multibatch

– Scrubbing LHC 25 72 Bunches

LHC 8:30 meeting

Injectors and transfer lines (2)

● Thursday probe bunches were extracted into the TT60 & TT40.● Saturday afternoon beams were sent down the 3 km long TI2

and TI8 transfer lines to the downstream (LHC end) dumps.● Saturday night stability checks were performed.

LHC 8:30 meeting

TI2

TI8

Open issues

● TI 2 Transfer line PC RBIV26407 tripped (to be checked)● RQT13.L8B1 increased from IPNO from 400 to 450 (b*.6m) Done ok● RCBV27R4B1 communication lost● RCBXH1.L1 tripped (circuit super-locked)● RQTL11.R1B2 problem on TT893 temperature sensor● RD34.LR3 ramp-down settings are “out of limits”● RQX.R2 QPS controller communication problem; oscillating● RQTD/F circuits unable to load ramp/squeeze function (Fidel on Monday)● RQF/RQD require higher commissioning current for high beta (50 A)● Inject & dump status is badly returned by one of the 2 CPLDs on the TSU ● MKI synchronisation checks with beam show a shift of the kick by +160ns w.r.t.

beam (to be decided how to adjust it RF)

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Access

● Radiation veto after machine closed !!!

● Access system– PAD problem PM25– Possible intervention Monday morning

● Alfa– Monday morning Point 1

● BT – Access point 6 for TSU inject and Dump

● R2E – Monday morning TX76 1Hr

● X ray 2 & 8– Monday afternoon point 8– Tuesday morning point 2

Planning

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Summary● Situation of the machine:

– The LHC magnet and powering system is fully commissioned and the machine is in a very good state – as demonstrated by the cycling of the machine.

– RF need 2-4 hrs for fine tuning before beam.– LBDS & MKI minors adjustments before declaring operational. – Essential beam instrumentation and feedbacks tested. – fine tuning

with beam.– Control system operational – smaller issues will be fixed in the coming

days.

● First beam hopefully Tuesday afternoon!

LHC 8:30 meeting

Saturday

● 09:00 Start LBDS tests● 09:13 Starting ramp of RF and ADT.

– stay at flat top with the RF to stress the cavities.

● 15:30 Beams down TI8 & TI2● Application Collimator Scan is tested and worked fine.

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Last night

● 22:30 Alfa interlock.– Tests couldn’t be performed – Problems related to the movement of their XRPs there’s presumably a problem

with their logic control; experts will check it this morning

● 22:50 Etienne finished the tests on MKI.– Now left to do the circulate and dump for both Beams.

● Circulate & DUMP B1&B2 (~50 shots each)● Short access for ATLAS to verify the cooling system;

They will need to intervene this morning to fix a problem they have identified (estimate: ~4h, to be scheduled)

● Ramp of PCs (except RQTD/F)● Squeeze

– without RQT13.L8B1 (out of limits error) and RQTD/F circuits

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Last night

● RQX.R1, RTQX1.R1 and RTQX2.R1 tripped while executing RAMPDOWN[START] function– but no fault present (only PC_PERMIT went away)

● RD34.LR3 gives a "out of limit" when loading the ramp-down function

● ALICE requested some time for a cosmic ..● Executed ramp of PCs (without RQTD/F & RCS/O/D) & RF

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LBDS MKI tests

● BETS fully tested at 450GeV and 4GeV. Ramp was OK. – Error check during the ramp still to be done on Monday by Nicolas V.

● Injection inhibitions between LBDS and MKI are OK. – Response times are within specification

● TSU clients tested:– BIS -> OK– BETS -> OK– Internal failure (frev switch off) -> OK– LBDS trigger --> OK– Circulate & dump -> OK– Inject & dump -> functionnality OK issue with XPOC (see below)

● TSU synchronisation -> OK● TSU IPOC thresholds have been adjusted All OK now● MKI synchronisation checks with beam show a shift of the kick by +160ns w.r.t.

beam (to be decided how to adjust it)● Inject & dump status is badly returned by one of the 2 CPLDs on the TSU (to be

decided)

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LBDS tests

● BIS loop closed and arm beam dump- done ● Check injection inhibition from LBDS- done ● TSU tests for about 4 hours to test clients (BIS, BETS,…)- done ● Circulate and dump for TSU testing for about one hour. Done

– Mask modules in XPOC which are not yet receiving data.-

● Check IQC- ok● Synchronization of MKI with AGK without beam, loops closed.-Checked ● Beam down TL TI2 and TI8. Rough steering.- done ● TCDI machine protection tests done ● TCDI set-up tests.- chiara ● Direct interlock of LASS to LBDS- .>>> done● LBDS energy tracking interlocks by trimming– only needs BETS armed, not BIS.- done ● Check BIS timestamps and redundancy of signals to LBDS (with CM, if time

available)- Other tests from MP Web page.

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Injection status

● Managed to pulse both kickers. – Need to check why only the TCDIs beam 1 are interlocking in parking and

not beam .

● Problem with timing system: – hidden tables loaded in MTG. Cannot see them and cannot unload them,

but they are played (injection, injection_BI).

● Inject & dump does not work currently.● Circulate & dump is fine

– (uses the hidden tables automatically).

● Running circulate & dump in a loop not possible– masking on XPOC not working anymore. (Roman). >>Done

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MKI MPS tests

● MKI MPS tests – Toggling MKI status and checking input state on injection BIC, both beams

- Verifying and adapting soft-start settings (normal and extended), both beams - adjusted operational limits around nominal value (entries 7 and 8) - changed voltage step size for extended settings (entry 14)

● Probed voltage limit for which MKIs not pulsing anymore (1 kV above nominal value, 1 kV below conditioning value), only for P8 done

● Loading kicker soft-start settings from TRIM and FESA, not possible to change without MCS role, possible with MCS role

● Changing critical settings in MKI application only possible with MCS role

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MKI MPS tests

● Tried to do the energy tracking tests:

changing LHC energy: SIS injection energy consistency check stopped us from trimming the RBs above the BETS limit of 0.96 GeV, need a workaround for the commissioning to still perform this test in the next days - changing MKI voltage: within operational limits the kickers are pulsing, need to check with limits further open (MCS role needed)

MKI tests not finished.

● MPS interlock tests for collimators TCDI, TDI, TCLI and TCDD in P2 done

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Injection status

● IQC all data collection is fine, but the soft-start buffer is pushed to PM too early before it is updated after the pulse. – -> The IQC does not find it having pulsed. Done .

● OASIS for MKI signals still needs follow up next week. Currently not fully operational. Done

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Summary TSU test (both beams)● Check TSU clients:

- BIS triggering --> OK- BETS triggering --> OK- Internal failure triggering --> OK- LBDS slow control triggering --> OK- Inject and dump triggering --> Works fine but bad status acquisition from CPLD2 (XPOC error)- Circulate and dump --> OK

● Issues to be followed:- Inject and dump detection (TSU card CPLD2)- Spurious bad XPOC analysis on TSU (missing dump request detection, XPOC event builder synchronisation)

ALL dumps properly synchronised...● Thresholds adjusted for TSU-IPOC analysis:

- re-trigger detection decreased to 199us- DBRF length detection adjusted to 1us- BRF length detection adjusted to 0.9us- BAGK length reduced to 10.9us

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ABT Software

● ABT and BI had to adapt many FESA devices in a manner to have their PM buffers properly saved into PM data store for IQC and XPOC analysis.

● Impacted systems are:- – MKI/BETS- MKI/IPOC- LBDS/TSU- BTVDD – Now everything is fine for both IQC and XPOC.– We only miss Vacuum data for XPOC, so we had to mask the VAC module

temporarily. – It seems that work is ongoing on TE/VSC side to find a solution to the

problem.

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Safe Machine Parameters System 29