LHC Machine check out

Transcription

1 LHC Machine check out R.Giachino / M.Albert 1v1 Be/op 12th March 2012

2 Hardware Commissioning: M. Pojer, R. Schmidt and M. Solfaroli Summary of week 10 Machine checkout: R. Giachino, M.Albert and J. Wenninger Aims of the week Finish HWC Prepare machine for first beam LHC 8:30 meeting

3 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

4 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

5 Status of powering tests In total, 8185 tests steps (including preparations of powering tests) have been done Progressive availability of cryogenic conditions

6 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

7 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. control issues were identified have been fixed or will be fixed in the coming days. Machine cycle LHC 8:30 meeting

8 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

9 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) 9

10 LHC 8:30 meeting Controls Along the week the OP teams with support from numerous equipment groups tested applications, front-ends, LSA core etc..

11 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

12 Injectors and transfer lines (1) PSB started up with beam 20 th February. LHC-indiv Lhc50 LHC-probe LHC25 PS started up with beam 23 th February. LHC-probe, LHC-indiv. LHC50 12b setting up SPS started up with beam 25 th February. SPS aligned, probe bunch ready to be extracted to the LHC. LHC-Indiv, LHC-probe, LHC50 multibatch Scrubbing LHC Bunches LHC 8:30 meeting

13 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. TI8 TI2 LHC 8:30 meeting

14 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) 14

15 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

16 16 Planning

17 Situation of the machine: Summary 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

18 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. 18

19 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 19

20 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 20

21 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) 21

22 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. 22

23 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 23

24 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 24

25 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 25

26 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 26

27 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 27

28 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. 28

29 Safe Machine Parameters System 29