IP2I CMS Wiki

Those are the instructions for test beams in May 2018 to operate iRPC chambers with Petiroc electronics.

M. Gouzevitch: 161454

K. Shchablo: +33769643416

E. Voevodina:

G. Grenier:

The DAQ operations are integrated in GIF++ WEBDCS. We use the http://webdcs904.cern.ch/

Here you can set-up HV scans (current, noise, efficiency). Each scan would have a scan number on WEBDCS and each HV point would have a run number associated to it. In Settings –> DCS Settings. Be sure you choose Lyon DAQ. Also depending on the needs you may use RPC Mode: Double gap or Single gap.

Then go to HVscan –> Start DAQ HV scan
Set up minimal measure time. It is the time for each HV point. It would be defined by the number of triggers expected with the current conditions. ASK EXPERTS how to get this time or get it from instructions in elog.
Keep waiting time at 5 mn.
Max Triggers have no impact on DAQ just have to be above 10.
Below an example:

Before you start the run you need to do some book keeping at the end of this page . Prepare the table in following format and some explanation.
The HV points shall be the ones you prepare during “Start DAQ HV scan” phase.
The attenuator you know from the source console.
The Web DCS Run number would be assigned as soon as you launch the scan. You can find it in “HVscan DAQ Run Registry”.
The HV point DAQ run you obtain from “Monitoring → PMON”. See section DAQ issus just below for more details. You would have to fill this value each time a new HV point starts. Or you can retrieve it in the log if you left for some time the room.

Below an example:

HV scan without changing the threshold done to test XXX

At the end of your shift please post a summary on elog: elog

Go to Monitoring → PMON. And survey on the right

The good situation is

Connection 0
Event XXXX –> A big number incrementing during spill.
Run: DAQ run number to write in dokuwiki table

Possible problems:

1. The event number is not incrementing during the spill: ACTION check if there is beam! If no beam wait for the beam
   If there is beam but during 2-3 spills there if still no triggers stop the scan and restart it. If there is an other problem showing up in PMON or run number still not incrementing CALL THE EXPERT.
2. The connection status is different from 0: ACTION stop the scan and restart. If the problem persist CALL THE EXPERT.

The instructions for experts.

At some point some basic DQM would be implemented in WEBDCS. Till then you can run the analysis code described here.