GAS M&O meeting 19 November 2021
Present: Beatrice, Roberto, Patrick, Fred, Kacper, Patrick, LPh, Mattia, Mara, Fabio
Indico: https://indico.cern.ch/event/1098517/
ALICE #3704
- Nothing done and to report by LPh
TPC
To remember/to do
- still to do: to change pressure sensors from bara to barg —> LPh asap
- Understand purifier column sequence issue with Michal and if we can decrease pulses to avoid spikes in loop pressure
- new MFC to install
- pump regulation valve noisy since the restart (~10%) —> to check old PID
From previous meeting (05/10)
- Krohne: only present one readying for the full system (distribution is just one channel) —> Leonardo gave to Michal the formula (15/10) —> Michal to implement
TRD
- still spikes present in regulation valve of the pump (reported by piquet): Beatrice checked with Chilo who suspects are due to change of temperature of gas when electrics goes on/off
To remember:
- distribution module: one big difference between PT and pressure gauge: to check which one is wrong
- T sensor in pump: Patrick said he can do but it takes time —> postponed
- difficult to restart: need to work on PID of pump and distribution when correct gas present
- problem of noise in the read-out of Krohne to investigate
- Brown bottle to fill: tested in another bottle and from the test we know now that it has to be done all manual --> LPh to check with Chilo when to do
- disk de rupture: they work —> LPh has to contact the safety (dated of 2019)
- purifier Xe recuperation humidity at -10 C —> Gianluca to check if is ok
HMP
- system in purge
- O2 sensor to calibrate
MTR
- alarm of computed ratio in mixer blocked —> LPh to unblock asap
- fluctuations in Exhaust MFC —> to check
- exhaust Patm in error LL —> LPh to check with Michal
- XMFC of exhaust was in error (also others exhaust MFCs sometimes are in error), now error disappeared —> Michal/Kacper to connect to the MFC to try to understand why and/or replace to see if it is related to profibus
- next week: visit to check for cable for pressure sensor of chamber
- GC set-up: Chilo doesn’t want to have He in common
From previous meeting (22/01)
- at start of the mixer, SF6 concentration is not correct —> Michal/Gianluca to investigate
- back-up to check —> LPh
- pressure sensor on the chamber doesn’t work —> LPh
- Tescom of the Zimmerli of the exhaust broken —> LPh to change
- Zimmerli of exhaust and mixer don’t have the remote control —> LPh to implement
- MFCs of humidifier and exhaust in error (but it seems they work) —> Michal/Patrick to investigate
- pump regulation to check as it doesn’t work well at the start of the system
- to connect dummy chamber electrically —> LPh
To remember
- leak test and maintenance in the distribution —> LPh/Mattia
TOF
- pump 2 membrane to change
- rack 61, ch 9 —> to check
To remember
MCH
To remember
- still some work in PID tuning
PGS
- N2 flow alarm blocked —> LPh to check if it can be deblocked
To remember
- N2 flow alarm blocked: HH consumption: why?
- SF6 PGS is scheduled in 2022 —> LPh to check with David if it can be done this year
ATLAS #3703
MDT
- when system stops —> start to receive ELMB alarms —> to investigate
- spikes in flow read-out since beginning of 2020 —> Michal to investigate
- flow of rack 63 ch1-8 both input and output low with respect to Run2 (but nothing changed), maybe it is like LHCb MWPC? —> Michal to investigate
- pressure sensors to check/change: 64/5, 64/7, 65/16, 66/16, 74/5
To remember:
- calibration bottle arrived for H2O sensors
- found 60 ppm of offset in Vaisala (but within the specification): new calibration to do (bottle ordered)
- list of pressure sensors replaced in the last years —> Kacper
- some spikes in flowcells after the upgrade, spikes also up to 3000 l/h so it is not a real flow spike —> Gianluca to prepare few examples
- Rack 73: change of ELMB and now ok. Michal to check the ELMB in the lab
RPC
- sniffing in all racks to check for leaks on-going
- waiting for Bronkhost for MFC LF line re-calibration
- now 1050 l/h because we lowered flow of rack 69 (in open mode)
- next week start to work in new racks for adding impedance, calibration flowcells, regulation valves and back-up
- for back-up: Michal to check if we can modify drawings in WinCCOA
- some instabilities reported by RPC team in racks 68-69 —> under investigation
To remember:
- purifier 3: missing MFC for conditioning
- changed motherboard/ELMB in rack 63 because of channel 2 in error (it was already changed in 2020)—> Michal to check motherboard/ELMB removed
TGC
- when system stops —> start to receive ELMB alarms
- rack 63: working on flow and readout of flowcell.
- rack 67: stop and start several time (asked by TGC people)
- flowcell to check for new rack, we have to have everything calibration in 100% CO2: missing rack 67
TRT
- stop due to cooling water failure, now fixed and Kostya restarted system
From previous meeting (23/10)
- Krohne new formula prepared by Leonardo —> Michal to implement
- Krone exhaust not working properly: to check if it is the krohne or our electrical part. Patrick to try to check the electrical part
- Kacper to check for regeneration of purifier material
MMG
- MMG 1200 ppm of H2O: ok
- IR installed, finishing cabling.
- Logic: if iC4H10 high —> stop of mixer
- rack 61 on MMG electrically (before in CSC). Some issue found and fixed
- rack 61: on CO2 flushing local
- web mass moved from CSC to MMG —> Michal to move software readout
- to do safety visit for flammable gas —> Beatrice/Kacper
PGS
- problem of emptying the bottles due to high flow consumption
CMS #3700
RPC
- 22/11: zone declassified for few days to allow zen to do welding
- demonstrator chamber connected to purge (from mixer) somewhere in endcap
- IR finishing pipes
- IR: temporary modification to have all alarms in one infrared and run with iC4H10 —> Patrick
- received glasses for rotameters —> to install at next stop
- manual valve of pump is half open —> to open completely when we increase the flow
- working on PID for regulation valves: presentation by Mattia: https://indico.cern.ch/event/1098517/contributions/4622366/attachments/2349394/4007115/PID%20tuning.pdf
- group 1 and 5: new regulation valves installed: to start racks and see if new seat is ok
To remember:
- iC4H10 problem: still 0.1% difference—> Mara to check with the company:
- according to company calibration should be performed once/month. coherent with discrepancy we see, develops after ~ 4-6 weeks. Calibration has to be done manually, 5% isobutane bottle is flammable, cannot stay permanently connected in rack (checked with R. Perruzza)
CSC
- Arcal 10 installed for few days (instead of 15) in the meanwhile that zone is declassified
To remember to do
- zimmerli in parallel to MFC of exhaust didn’t open when recovery stop —> to do some tests —> Mara/Andrea
- Difference in PT5005-PT5010: is it in the purifier? --> Mara to check
- To put scale sticker on all bubblers —> Andrea-
- new Von Rohr regulation valve to test
DT
- in open mode, test on mixer to check Ar/CO2/Air concentration
- to plan installation of new regulation valve for the exhaust
To remember
- test on the exhaust module since when there is a start after a stop we loose ~0.1-0.2 bar: it looks like regulation valves in distribution open too fast. PID changed, to do other tests
GEM
- filter installed at the input of distribution
TRACKER
- MFM to install: postponed to next year by Tracker team
LHCb #3701
RICH1
- new connectors on detector side, maybe RICH1 team will need help
RICH2
- found problem with pump 2: broken pipe
- after fix, to try pump 2
- Patrick opened exhaust of zimmerli —> to close to check how much gas we loose
- To understand if it makes sense to change the limit values of pressure in the loop
To remember
- IR analysis: to add pump for recycling the gas —> Patrick/Mara
- to investigate stop of RICH2: maybe related to profibus? module WAGO changed
- Leak test of purifier on-going: done but not report
- New leak appeared: probably at detector level. Patrick is checking with Christoph
- Detector people changed some connectors of cables at the detector level
- PT5005 changed but still spikes visible: to think about
- problem of high injection of CO2 from the mixer
- probably due to purifier (leak in column A + not saturated in CO2)
- leak already present in 2018 (elog #2886)
MWPC
- fluctuations in Exhaust MFC, buffer pressure and total flow —> to investigate
- strange behaviour of flowcell during the pilot run —> to check if same behaviour in other systems
Reminder
- SG-UX pipe to test
- check of flowcells reading and check with Oleg if he does some leak test —> Mara/Patrick
- impossible to do leak test at detector level unless we know exactly what distribution section to test no leak search was ever performed on their side as it is very difficult side A can be accessed in autumn but they cannot test all chambers
- found leak, probably on distribution: new test and no leak found
ANALYSIS CHAIN 3
Reminder
- leaks in electro-valves —> to change all
SciFi
- UPS to install
- 2 DSS cables to pull: one for compressor on/off (for gas team) and one for detector team
- 6 safety valve calibrated, others under calibration
PGS CF4
From previous meeting
- two panels for the CF4: flow in one and pressure in the other —> Michal/Patrick to fix
- not anymore buttons for “put back on” the sides —> Michal to remove the two squares from visualisation and to check if something in software logic has to be changed
- new system of switch between the two side —> Mara to check at which pressure there is the switch
NON-LHC #531
Reminder:
- Some valves in force mode in LINAC —> Fabio/Roberto to put comment
- LINAC4: to buy a spare PLC Siemens —> Michal next year
SOFTWARE
From previous meeting
- new monitoring page “Exhaust++” done for ATLAS MDT explained by Gianluca. Everybody to look and give comments
- next step: to do a similar page for one gas system for each experiment
- To check for having warning in difference between PT5011 and PT5005
- New feature for alarm when system is OFF: to provide to Michal the list of alarms we want to have when system are OFF —> Mara/Gianluca with experiment technical responsible by week 5
- Profibus/canbus monitoring: Michal shows where we have and where it could be useful to have (based on history of problems in the past). To discuss if regeneration of code is worst for these system
- We need to define how to proceed for the classification of warnings and alarms
- Slide on the modifications asked by Schniedr with pictures and time needed to do modification
- To fix the StepWS problem asap otherwise difficult to have history in case of problems —> Michal/Gianluca
- Patrick will prepare a box with all spare material for PLC. Box will be in electrical workshop
- For system with old PLCs: Michal to add in the rack an old spare PLC
- For TFC: Michal to ask to Majec for a spare IO card (special one for TFC)
PIQUET
- Discussion of alarms week 45-46
- Piquet went in CMS for simulation of big problem (event foreseen)
- LHCb RICH2: regulation valve at 0%, high pressure in buffer: system emptied through purifier
- ALICE TRD: regulation valve at 0%. It happens often —> to check with Chilo
- ALICE TRD: mixer alarm: Xenon bottle closed
- ALICE TRD: purifier injection too long —> LPh/Gianluca to check
- CMS RPC: H2O in the piege: piquet went on site to empty
- CMS RPC: alarms on endcap, but endcap off: Mara blocked the alarms
GENERAL
From previous meeting
- Found problem of PROFIBUS MDT: termination of PROFIBUS PA on the connector was wrong —> to change in ALL gas systems
- Aging test priority
- To do: Airliquide pressure reducer, IR iC4H10 BINOS (they do aging —> LPh to check for modification)
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