GAS M&O meeting 24 September 2021
Present: Beatrice, Roberto, Michal, Patrick, Mattia, Fabio, Mara, Gianluca
Indico: https://indico.cern.ch/event/1079992/
ALICE #3557
TPC
- decrease of CO2 pressure for purifier to have less flow during cool down phase
- discussion on start of the pump in PrepRunPh1, probably due to bars vs bara comparison —> Michal/Gianluca to check
To remember
- 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
- lost of 500 litre in the system due to problem in he re-starting with 2 pumps by Chilo —> to check with him what happened to avoid in the future
- purifier Xe recuperation humidity at -10 C —> Gianluca to check if is ok
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
- 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
HMP
- request to start system on Wednesday
From previous meeting (03/08):
- Distribution rack in alarm —> LPh to check
MTR
- humidity went at 8800 ppm: purifier saturated
- when purifier was in heating, it stopped (Value=1 Column A is offline.) —> Gianluca to check why
- XMFC of exhaust and humidifier in error (also others exhaust MFCs sometimes are in error) —> Michal/Kacper to connect to the MFC to try to understand why
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
To remember
MCH
To remember
- still some work in PID tuning
PGS
To remember
- SF6 PGS is scheduled in 2022 —> LPh to check with David if it can be done this year
ATLAS #3562
MDT
- calibration bottle arrived for H2O sensors
To remember:
- 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
- problem in one VAISALA reading but it is not the sensor —> to investigate
RPC
- rack 61, 62, 63, 64, 66, 67 ON with 98%N2, 2%R134a
- problem in new flowcells calibration: need to dismount and recalibrated asap —> Michal
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
- exhaust pipes finished, missing support and heating cable and electrical connection —> Kacper/Patrick
- gas system on
TRT
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 team confirmed ok 2800 ppm of H2O
- rack 61: to check electrically to connect to MM gas system —> Patrick/Kacper
- to check for DSS signal —> Beatrice/Kacper/Patrick
- to do safety visit for flammable gas —> Beatrice/Kacper
- Gianluca to check with Paolo Iengo if iC4H10 is needed for pilot run
CMS #3553
RPC
- flowcells of rack 77 have a deviation of 75%: with new calibration very strange values, probably due to bug in calibration stand. Michal is working on
- Andrea removed lateral doors for UX racks to have access to flexible pipes with B-field. Andrea will put protection for bubblers
- leak in bubbler of rack 63 —> Andrea to replace
- 2 pumps in the loop but problem with valve —> Mara/Andrea to check for a solution
- high flow test
- barrel not possible to reach the desired values —> to change valve in rotameter —> Mara/Andrea
- endcap, flow reached but in some racks too high pressure in input —> Mara to prepare a summary
- endcap group 1 and 5, Von Rohr valve reached 100% —> to change the seat for a bigger one —> Mara to check with company asap
To remember:
- low flow MFC (1200 l/h) received —> to plan installation
- 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)
- Group regulation valves that are at 85% for group 1 and 5 —> Andrea/Mara to check
CSC
- canbus cable to be replaced between rack 65 and service cavern: Andrea asked to CMS
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
- O2 sensors calibrated
- H2O sensors have a different values wrt chilled mirror and it looks also different wrt to VAISALA of humidifier —> Mara to check values and prepare a report
- week 40 in open mode
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
To remember:
TRACKER
- MFM to install, waiting green light form users
LHCb #3558
RICH2
- request to go back in CO2 in week 41
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
- CF4 started on Monday, mixer at 150 l/h to have correct gas mixture on Monday
- CO2 in mixer put at 2 bar otherwise not possible to increase the flow in the CO2 MFC
From previous meeting
- 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
Reminder
- found leak, probably on distribution: new test and no leak found
ANALYSIS CHAIN 3
Reminder
- leaks in electro-valves —> to change all
SciFi
- several test done to check the logic —> Mara/Patrick to prepare a summary + description of gas system to present to the team for next meeting
- pressure sensors at 100 mbar, safety valves at 200 mbar: is it ok? —> Beatrice to check
- the 2 vaisala have a discrepancy of 4 C —> Mara/Patrick to do a calibration
- Mara to check with Sune for the flow vs pressure test
- 2 DSS cables to pull: one for compressor on/off (for gas team) and one for detector team
PGS CF4
- two panels for the CF4: flow in one and pressure in the other —> Michal/Patrick to fix
- panel not used: to change the label in “Spare”
- new system of switch between the two side —> Mara to check at which pressure there is the switch
- 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
- to check CF4 consumption wrt MWPC mixer in the next week —> Mara
NON-LHC
- 904 RPC mixer stopped: to check why
Reminder:
- Some valves in force mode in LINAC —> Fabio/Roberto to put comment
- LINAC4: to buy a spare PLC Siemens —> Michal next year
- NA62: to check if we need to buy only the new PLC or also the I/O cards —> Michal
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
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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