Gas systems project

→ Europe/Zurich
155/R-047 (CERN)

155/R-047

CERN

10
Show room on map
Beatrice Mandelli (CERN)
Hide

GAS M&O meeting 30 April 2020

Present: Beatrice, Roberto, Andrea, Patrick, Kacper, LPh, Fred, Michal, Mara, Gianluca, Sabino, Fabio, Federico, Leonardo

Indico: https://indico.cern.ch/event/912569/

 

 

CHECK Gas Systems

 

ALICE #2423

TOF

  • GC analysis: SF6 at 6.72% —> change MFC SF6 to 7% (it was 8%)
  • Probably a leak is present: to check when we are back. We can use the new R134a sniffer —> LPh+Fabio/Federico

Other

  • Change He GC bottle

 

ATLAS #2427

MDT

  • New pressure sensors with problem: need to change or reset when we are back. To prepare a list of sensors that stop to work or drift in order to have a clear overview —> Kacper
  • Presentation by Gianluca and Kacper on overshoot pressure problem:
    • ~ 30 mbar of overshoot and 15 hours to stabilise
    • overshoot is mitigated with higher Kc: doubling the Kc reduce of half the overshot
    • overshoot vs duration power-cut in the past —> Kacper
    • Gianluca checked and the PID are the same of last year
    • Roberto proposes also to lower the Ti to ~1
    • Roberto suggests that maybe the PID box changed —> Michal to investigate
    • Beatrice asked if there could be any correlation in the change of pneumatic pipes and FESTO Cabinet. To check speed of opening of regulation valve —> Michal
    • Tests to do next week: discussion offline to discuss the procedure —> Kacper, Gianluca, Beatrice, Roberto

TGC

  • To send an email to Leatitia for the safety form for preparing the intervention for when we are back —> Kacper/Gianluca

 

 

CMS #2426

RPC

  • Andrea increased flow in racks 84 and 86, probably problem in flowcell reading in UX. To verify when we are back —> Michal/Mara
  • Rack 80 ch 7 problem in reading: to check cables in flowcell when there is an access —> Andrea

From previous meeting:

  • with the power-cut some racks went underpressure -2 mbar, this is probably due to leaks in the detectors —> Andrea to prepare list of racks with this problem

 

LHCb #2430

RICH2

  • change pump membrane (pre-alarm of membrane pressure received, very good!)
  • New compressor module: Patrick to check with LHCb if it is possible to install in flammable room.

MWPC

  • change pump membrane

RICH1

  • to restart the system this week or beginning of next in order to try to understand if we take Air —> Patrick
  • Patrick proposed two tests:
    • Check Air intake with system running continuously
    • Check Air intake with stop and start of the system

General

  • To remember that there could be the possibility of having a RPC-like mixer to install in LHCb (CODEX-b project)

 

GENERAL

  • Presentation of 3D drawings by Leonardo:
    • 3 modules ready: mixer, exhaust and pump
    • now Leonardo is doing the purifier
    • to check mixer module and to send comment to Leonardo before next meeting —> everybody
    • missing list of material for mixer and exhaust —> Leonardo to understand if to do now or when we are back with help of technicians
    • LPh will send to Leonardo list of material for Exhaust module
  • Presentation of PROFIBUS by Patrick:
    • Two possible types of check:
      • with profibus trace: we check the voltages. They have to be ~ 5V
      • with multimeter: we check the resistances. They have to be < 20 Ohm.
      • the second test looks more easy for looking at possible problems
      • for both tests the gas system has to be OFF
      • good example of ALICE TRD in slides #6 and #7
      • for doing these type of test we need 2 people and 1 day per system
    • The profibus signal of ALICE TRD was very bad with old profibus module
    • With new profibus module the signal improved a lot but still some reflections visible
    • After the change of 9 connectors the signal is now good
    • A profibus connector costs ~30-40 chf (the one that are old and that could have problem)
    • We have 29 connectors for each system
    • To do a proposal for WinCC-OA errors from profibus —> Michal
    • For Profibus signal we can have maximum 32 stations without repeater: enough for LHC but not for CLOUD —> to investigate
    • Profibus check has to be done before and after the change of PLC but it is not enough
    • Need to test all resistance in profibus connectors. Not done for all system where we changed the PLC —> to plan to do
    • Test on Profibus status in OT in order to have a procedure of all tests needed
  • PGS list of sensors not working: missing ALICE
  • Two lists of warnings: one for the piquet (very important for operation and to anticipate interventi to avoid a stop of the system) and one for standard operation: Michal said it is possible —> to define what we want
    •  

From previous meeting:

  • Level of PGS sometimes is > 100% —> Michal to check

 

ACTIONS:

  • To check mixer module and to send comment to Leonardo before next meeting —> everybody
  • Kacper to prepare a table of ATLAS MDT pressure sensors with problem and keep it updated
  • To prepare a list of sensors not working or missing in PGS —> LPh
  • To send an email to Leatitia for the safety form for preparing the intervention for when we are back —> Kacper/Gianluca

From previous meeting:

  • To prepare a list of sensors not working or missing in PGS —> LPh
  • With the power-cut some racks went underpressure -2 mbar, this is probably due to leaks in the detectors —> Andrea to prepare list of racks with this problem
  • Excel file for alarms prepared weekly by Mara —> Experiment technical responsible to fill
There are minutes attached to this event. Show them.