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ALICE TC meeting – 28.05.2010 Plans for the next technical stop

Detailed schedule of technical interventions, access permissions, and maintenance tasks for LHC stop from 31st May to 2nd June 2010. Includes specific instructions for equipment and personnel involved.

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ALICE TC meeting – 28.05.2010 Plans for the next technical stop

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  1. ALICE TC meeting – 28.05.2010Plans for the next technical stop A. Tauro

  2. News • -- Technical issues, planning

  3. Last interventions • No access since last Friday Technical issues, planning

  4. Next LHC stops Next LHC technical stop May 31st-June 2nd Technical issues, planning K.Foraz https://espace.cern.ch/be-dep/BEDepartmentalDocuments/BE/2010-LHC-schedule_v1.4.pdf

  5. LHC stop 31 May, 1-2 June 1/4 • Schedule for the access: • RP search: Mon 8:00 – 9:00 • Start cavern access: Mon 9:00 (except L3, Dipole and muon side) • Ramp down L3 and dipole: Mon afternoon • RP search L3: Tue 9:30 • Access into L3 starts Tue at 9:30 • No access into dipole (no requests) • Mon starting at 6:00 AM: optimization dipole and solenoid cooling: magnets stay on till end of test • Increasing cooling water temperature of +2°C and, eventually, +4°C • Consequently, the temperature inside L3-Dipole might change on Mon • Restore old settings on Mon afternoon • Detectors SHOULD stay on during the day Technical issues, planning

  6. LHC stop 31 May, 1-2 June 2/4 • Cavern interventions: • TOF, Muon TRG, EMC, TPC and SPD: see slides • EN-CV: see presentation from Pierre • Platform above SPD cooling unit (Didier) + scaffolding (Ouvaroff, Mon 9:00) • TOF crates protections (Pieter, Samuel, Fred) • Flowmeter in mixed water line (C-side) (Philippe) + modification timing of L3 water valves (Dominique + Philippe) • ACO: electronics intervention (30-40 minutes) in rack (level 4, side O). Mon as early as possible • RP (Mon 9:15): 2 water samples (TRD, SSD) + 1 C4F10 (Isabel B. + Pierre B.). The results of gamma spectrometry might not be available before Tue AM • PMD: access to the detector to investigate cooling improvement. Tue • Charles Henri + firemen: Wed PM (L3) • Borge (laser): check laser high voltage and energy output. Take some mechanical measures for future reference. About 1 hour Wed PM • PHOS (A. Vinogradov):reset LED VME crate Technical issues, planning

  7. LHC stop 31 May, 1-2 June 3/4 • Cavern interventions (cont): • Marc: confined space course: Wed PM (L3) • ASN: cleaning toilettes UX-25 (Mon PM) Technical issues, planning

  8. LHC stop 31 May, 1-2 June 4/4 • Other activities • DAQ: see slide • DCS: see slide • TE-EPC: test new setting (threshold) on L3 power converter • L3 must be ramped up/down/up on Wed PM • Installation public address system in ACR (Tue) • CV: measurements T,P inside ITS dehumidifier in CR5. Tue at 14:00 • STOP plant for ~2 hours • CV: measurements pressure and flow L3 ventilation unit. Fri 28th 10:00 • Unit might be stopped 10’ • CV: maintenance pumps PX24 (mixed-water) + various interventions • Nothing will be stopped Technical issues, planning

  9. Muon Trigger Configuration & Readout problem (Right Side) • Readout problems Right side, initially in column 1 Right (see picture of pulser evnt) • Other configuration problems (Masks, LUT) of MTR electronics Right side • => MTR right side is not operational since Friday, May 21rst • => Clock distribution Right side ? • Access to cavern • P. Dupieux, YW. Baek, Monday May 31rst, from morning on • Other access needed on Tuesday or Wednesday if problem is not fixed on Monday (+ Ch. Renard, J.L. Beney) • Access area and needs • Below Muon platform and upper gangway • No need for nacelle nor scaffoldings Technical issues, planning 9

  10. RPC MT11_OUTSIDE9: Frequent, sudden HV trips since May, 24 We suspect bad HV connection (need to check whether it is on the cable or chamber side) Access to cavern:3 people (M. Gagliardi, A.Piccotti, P. Mereu) on Monday afternoon as soon as dipole is off. Possibly, need for further access on Tuesday. Access area and needs:muon platform Outside; need scaffolding ~ 6.5 m ~ 5.5 m IP Technical issues, planning 10

  11. TOF interventions during the technical stop (31 May – 2 June) • -DC-DCs to be replaced: • SM00 – crate 02 – C side • SM05 – crate 20, 21, 22 – A/C side • SM07 – crate 28 (29 to be checked) – A side • N.B.: to replace the DC-DC in crate 28 it’s needed to move the SM. • - LV channels to be changed (into spare ones): • SM00 – crate 00 – CH01 - A side • SM02 – crate 08 – CH02 - A side • SM02 – crate 10 – CH02 – C side • SM03 – crate 12 – CH01 – A side • SM11 – crate 46 – CH01 – C side • SM13 – crate 53 – CH02 – A side • SM16 – crate 66 – CH06 - C side • - HV channel: • SM14 – M1 (neg) to be checked – A side TOTAL: 5/6 DC-DCs TOTAL: 7 LV channels Technical issues, planning

  12. TOF people involved during the intervention: • - To move SM07: 6 • Gilda Scioli • Andrea Alici • Daniele De Gruttola • Rosario Nania • Anselmo Margotti • Michele Furini • - To change the other DC-DCs: • 4 inside L3 • 1 watcher • 1 in ACR Technical issues, planning

  13. EMCAL plans • Swap an RCU+DCS board (Terry). This board started to give CDH errors at a low rate over the last weeks. It became worse recently and has been taken out the EMCal readout, disabling the readout of 1/2 of a SM (1/8 of installed EMCal acceptance). This will be a few hours work to replace and test. It's located on the A-side of EMCal. • Repair a TRU trigger unit board (Jiri) on the C-side (1 of 12 installed). This was recovered during the last access, but it didn't remain long without problems. This would similarly be an access of a few hours. Technical issues, planning

  14. TPC plans 1. Displacement of a crate from a rack to the adjacent one in the C area: • we estimate this activity will take about 4 hours; • people involved: L. Musa, A. Junique, S. Rambaut. 2. Replacement of 1 FECc in sector A00 (rp5, br B, FEC 0): • we estimate this activity will take 1/2 day • people involved: A. Junique, S. Rambaut, Y. Lesenechal. Technical issues, planning

  15. TRD plans • Access to TRD switches in I08, O08, C17,C18: • check of switch status and cabling (especially I-side switches) review space, cable length etc. for eventually moving C switches to C19. Two persons in Cavern for 1 hour • Measure LV at SM bus bars (inside L3 - sector 07, C-side) • LV readings close to acceptable minimum • Two persons in L3 for 30 min. on Wed Technical issues, planning

  16. SPD plans Monday 31/05/2010 • 9 – 12: access to the cavern + RP cooling procedure (EN-CV) • fill up the bottle with new freon (Claudio) • 14 – 18: put the plant in safe mode (STOP + lines locked) and replace the freon Tuesday 01/06/2010 • 9 – 12: get to PP4 (ASAP) to replace the filters, close and vacuum the loops • 14 – 18: ● quick leak test ● restart the plant and re-tuning of flow with new filters • 18 – onwards: restart the detector Wednesday 02/06/2010 9 – 17: Operation on the plant in case of problems, delays or fine tuning Technical issues, planning

  17. DAQ activities DAQ activities on Monday 31.05.2010: • 9hrs: DATE software upgrade (reboot of all machines, also ACR) Afterwards: ACR PCs are available but the DAQ will not, due to further maintenance issues: • During the day: EDM test with Technical Runs • 16 hrs: FiberChannel Switch exchange (GDC interruption) • 20 hrs: ACR PC Linux version change (transparent change to users, no interruption, no reboot) DAQ fully available again before midnight. Technical issues, planning

  18. DCS activities • DB maintenance • 1hr on Monday morning, no impact • 3hr on Tuesday morning, no configuration, archiving to disks • Updates and rebalancing on various PVSS and Operating systems, short interruptions due to project restarts or PC reboots • Update on central console and interface, 2hrs, console should be made available on other screens • Implementation and test of supersafe datapoint (will need test with all relevant detectors) • DSS upgrade and backup, no impact on DSS itself (DSS screen unavailable in ACR during few minutes) Technical issues, planning

  19. ALICE integration progress • TRD infrastructure (top modules)……………… Raw material delivered to P2 Welding started (done in 1 week) Assembly started (Didier) Completed end July Test (with module) in September • Miniframe suspension tool……………………… Design completed Fabrication drawings done Completed end July • Delphi frame (new support)………………...… Design completed Procurement and fabrication (Yannick) • Delphi frame (table)……………………………… Design May-June To be sent to Simonetti Technical issues, planning

  20. ALICE visits VIP (expo and UX-25) • May 31st 11:00 to 12:00: 5 people from Huazhong Normal University, Wuhan • May 31st PM: Dr. Rakesh Bhandari, Director, VECC (T.Nayak) Non VIP (expo and ACR) • May 28th and 29th a group of ~70 students in Physics from University of Torino (M. Masera) Technical issues, planning

  21. AOB • Maintenance cranes: June (W22 to W26) • ADI problem (requestor/Donneur d’ordre of the document has to be staff member) • Next release will be deployed the first weekend of June (5th – 6th of June) • Regular cleaning CR1-4 restored • Test sirens: 7:00 to 8:00 Tue 1st June • Maintenance UX-25 lift (AS703): 7:30 to 9:30 Tue 1st June (delegation to CCC?) • Replacement speed regulator UX-25 lift (AS703) • Wed 30 June 6:00 to 13:00 – lift unavailable • Next confined space course on Wed 2nd June 13:30 P2 • Next TC meeting: Friday 18th June at 9:00 Technical issues, planning

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