ISR workflow Tests status

Transcription

1 ISR workflow Tests status CMS week September 05, DT session Jesús Puerta-Pelayo,

2 News & status Surface installation for YB+2, YB+1 finished (only feet MB4 chambers missing, to be installed after cabling) = 112 chambers (out of 170 still to be installed) HVB replacement well advanced (all chambers for next installation rounds before magnet test are already equipped with HVB5) Currently testing and preparing installation in YB0 and sectors & 11 negative wheels 2 shipments received since last CMS week (5 MB1 Aachen & 4 MB4 Turin) Shipments foreseen next weeks: 5 MB2 CIEMAT 5 MB3 Legnaro 4 MB4 Turin (October) Mauro Cordero (TO technician) spent a week at CERN helping at ISR activities María Chamizo Llatas (CIEMAT) has joined the ISR crew since 01/09

3 Chambers status HVB5 (HVBI) Under tests (HV/cosm) HV/Cosm OK RTI (MC) MB1 29 (40) MB2 29 (40) MB3 29 (40) MB4 1 (22) MB4/9-11 () 8 MB4/ 6 (6) 6 6 MB4/4 6 (6) 3 MB4/ (6) 2 2 Total 112 (170)

4 HVB delivery HVB ISR ~2000 HVB HVBs delivered from IHEP New shipment expected from IHEP end September (800 HVB)

5 HVB replacement Still 25 chambers at ISR with old HVBs Mostly spares & chambers for later (underground) installation rounds (6 MB1, 9 MB2, 5 MB3, 2 MB4/9-11, 3 MB4/4) Teams from all institutes have been present during the summer for replacement AACHEN: HV & scaler tests except last replacement round CIEMAT: All chambers tested under gas & scaler tests LNL: Only HV tested after closing! Next replacement rounds AA: Urgent: test chambers from last replacement (in progress) CIE & LNL?

6 HV long term test The achieve of a stable HV behavior is the most time consuming operation and the main source of delays in chamber certification. Many problems appeared only after weeks under gas & HV. Grass-like discharges are still present. In some cases even despite HV components substitution the problem didn't disappear. Careful isolation and handling of components is fundamental

7 Some additional problems Pay attention to discharges in HV connector (additional shrink tube is recommended for hot pins) Please add the mylar foil properly (covering the whole risky surface)

8 Gas tightness tests Minimum time constant required = 120 min Time (min) Time (min) L 4R L R Sector 2 3 4L 4R L R Sector MB1 MB2 MB3 MB4 MB1 MB2 MB3 MB4 YB0 YB+1

9 MC tests (F. Gonella) Intervention statistics from MC tests & reparations: Wheel 0 (1 MB1, 1 MB2, 2 MB3, 2 MB4/) 2 noise 1 bad connector slow control theta -> changed Wheel +1 MB1, MB2, MB3, 2 MB4/4, 2 MB4/, 6 MB4 14 noise 13 cabling (broken wires, bad/wrong connections, folded pins) 2 pin bad connection on feed thru 4 wire left inside chamber (mb2) 1 missed veto board on mc 1 dead channel -> FEB/HVC changed 1 FEB changed (fast masks) 2 slow control bus changed (fast mask) 1 BSR failed -> TRB changed 1 bad gas sensor

10 YB+2 chambers status Surface installation for this wheel is complete (apart from feet chambers, to be installed as soon as cabling is finished) Feet chambers are at the ISR, already fully certified (equipped with MC and tested), waiting for RPC coupling. All installed chambers have been commissioned. 1. One MB3 had HV problems during a few days (continuous wire discharges), intervention was planned but the problems disappeared by themselves (?) 2. One MB3 had to be substituted due to HV problems (continuous strip discharges) and FE problems in the Theta SL. It was substituted for MB3C34 (initially assigned to YB+1) and equipped with HVB5. 3. One MB4 had to be returned to the ISR from SX5 before installation due to HV problems. At the ISR the discharges were identified inside of a cell in phi1, which had to be disconnected. We succeeded testing it under cosmics in upsidedown position (RPC coupled).

11 YB+2 status MB4L01 MB4L04 MB3C04 MB3C18 MB2C49 MB2C22 MB4L03 MB1C MB3C14 MB1C13 MB3C34 MB2C19 7 MB1C14 MB2C23 MB1C16 MB4L03 MB3C32 MB2C48 MB1C34 4 MB1C15 MB2C24 MB4R04 MB2C47 MB1C09 MB1C17 MB3C30 MB2C17 MB4R02 MB1C28 1 MB1C20 MB3C24 MB2C46 MB2C26 MB3C18 MB3C16 MB4R01 MB4R02 Services (Gas, cooling) Installed ISR with MC HVB5 HVBI MB4C29 MB3C12 MB4L34 MB4R30 MB4C30

12 YB+1 chambers status Surface installation just finished last week with the last MB4s (again, no feet chambers installed yet) MB3 removed from YB+2 (MB3C) was repaired (cell disconnected), HVB substituted and reinstalled in YB+1 after testing. One of the MB4/ (MB4/C31)chambers was installed with HV problems. It will be repaired as soon as the gas flow at SX5 comes back to normality. One of the big MB4 (MB4C) had some gluing defects along certain cathodes of the upper plate in phi2. They induced noise and some mechanical problems. It was compensated by gluing a thick plate on top of the problematic region.

13 YB+1 status MB404 MB406 MB3C28 MB3C40 MB2C38 MB2C25 MB4 MB1C36 MB4C32 MB3C06 MB1C38 MB3C26 MB2C36 7 MB1C19 MB1C22 MB2C20 MB4C91 MB3C02c MB2C54c MB1C51c MB1C23 MB2C40 MB3C MB4C92 MB2C35 MB1C37 MB3C42 MB4L33 MB4R31 4 MB1C25 MB2C18 MB407 MB1C11 1 MB1C35 MB3C20 MB2C39 MB4C33 MB2C21 MB3C22 MB3C46 All chambers with HVB5 MB4R05 MB403 Installed At ISR (to be tested) Installed with HV problems

14 YB0 chambers status Next installation will proceed with the positive sectors of wheel 0 and negative sectors on the bottom part of the wheel (total 8 sectors to prepare). All chambers for these sectors have been aligned and equipped with HVB5. They are at the ISR going through certification (only 2 MB4s not yet present) As soon as these chambers are ready, equipped with MCs, and coupled to RPCs they will be stored in vertical position in order to advance the installation tasks and free some space at the testing area (Up to 24 chambers, tool will be ready in the next days). Actually already 6 of them are sitting on the transport frames

15 MB4xx MB3C38 YB0, positive sectors RTI, RPC coupled RTI (MC) HV problems Under HV, to be tested Certified, waiting for MC MB4xx MB3C50 MB2C03 MB1C44 7 MB4L32 4 MB1C53 MB2C37 MB3C44 MB4R29 MB2C07 MB1C21 MB1C12 MB2C45 MB1C08 1 MB3C48 MB2C08 MB4C50 MB3C36 MB4R09

16 MB4C02 MB4C01 MB4R0x MB3C17 YB0,negative sectors MB1C24 MB2C42 MB3C25 MB4R05 MB3C23 MB2C41 MB1C64 7 MB1C55 MB2C44 MB2C16 MB1C MB1C39 MB2C43 MB3C35 MB4L06 MB4C46 MB3C37 Old HVB Under HV observation Under HV, to be tested Certified, waiting for MC

17 Chambers for magnet test Chambers for sectors & 11 of negative wheels are being prepared as well. Certification is still a few steps behind YB0 chambers. (Installation foreseen for December / January) All chambers with HVB5 MB4L55 MB1C43 MB2C15 MB3C33 11 MB4R57 Wheel -1 MB1C45 MB2C28 MB3C31 MB4C48 MB4L56 MB1C42 MB2C13 MB3C27 MB4R58 Wheel -2 HV problems Under HV, to be tested Certified, waiting for MC 11 MB1C41 MB2C27 MB3C29 MB4C49

18 Perspectives Two wheels completed, YB0 in progress. We expect to have the chambers ready on time, but Final certification is conditioned by settlement of HV problems. These delays are unpredictable. MC availability is not delaying recently chamber availability. HVB production and delivery is out of the critical path. HVB for all chambers needed for next installation rounds before the magnet test have been already substituted. Only a few chambers are left for HVB substitution. For this few chambers, it s important to minimize the time required to have them ready for MCS. We ask the replacement teams to test the chambers (HV & scalers) after substitution. A new data base with final versions of the traveller files is almost ready. It ll be released in the next days. Data from MC & MC tests will be included, and we are planning to create an electronic logbook for tests.