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Web Based Monitoring DT online shifter tutorial Jesús Puerta-Pelayo CIEMAT Muon_Barrel_Workshop_07/July/10. CMS Web Based Monitoring. What is CMS WBM? WHAT : set of java based web tools

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Web Based Monitoring

DT online shifter tutorial




cms web based monitoring
CMS Web Based Monitoring
  • What is CMS WBM?
    • WHAT: set of java based web tools
    • WHAT FOR: remote (read-only) access, retrieving and monitoring of DCS variables (or any other info stored in OMDS)

OMDS: Oracle database containing mostly detector related quantities (Voltages, temperatures, HW errors...)

    • WHO:
      • Core support team (technical support, common tools, maintenance)
      • Subdetector experts (development of detector-specific tools)
  • Accesible from outside CERN network (CERN certificate)


Why is WBM useful for a DT shifter?

  • It’s the official tool for the monitoring of CMS status from outside CMS.
  • First glimpse of detector status (from outside, no tunnel required)
    • LastValue, TriggerRates, Page Zero...
  • Historical values
    • RunSummary, Trend of variables, Downtime Logger
  • Most of the tools are expert-oriented, but still it’s recommendable to know where to look at, in case we want to trace back problems.

CMSWBM home & tools

Sub-detector tools

Central tools


Central tools (I): Run Summary

For a given run, RunSummary retrieves historical information

(configurations, subdetectors status, Bfield...)

Selection can be done on time, type of run, subdetectors included, etc.

The ongoing run can be checked

To be used :

Check the conditions of a run (general conditions and subdetectorconfig)


Central tools (I): Run Summary

Snapshot of information shown by RunSummary for a particular run

Basic variables

Subdetector specific run summaries

Trigger & LHC info



Central tools (II): Trigger Rates

Check the instant trigger status, including rate plot, configuration

Can be used for historical values (old runs)

Pick a run (by default last or ongoing run)

Basic variables

Select different contributions to trigger plot from this table

To be used :

Check the current or past trigger configurations (for the current run or any old one)


Central tools (III): Runtime Summary

For a specific LHC fill, it provides details and statistics about Runtime quality

To be used :

Check in detail the reasons of downtime for a particular LHC period


Central tools (IV): CMS Page Zero

Overview of CMS status

To be used :

Overview of current CMS conditions

And many other tools can be used to retrieve information


How to track DT status?

  • From central services:
  • Some DT variables monitorized via LastValue tool
  • (last stored value by DCS on the omds DB). It provides the current status of the detector.
  • Very useful to check current (and historic) status of detector from outside P5

HV, LV, gas, PADCs

To be used :

Check current HV / I or gas conditions

Retrieve old status of these variables


How to track DT status?

2) With specific tools developed for DTs:

HV diagnosis & monitor

DT run summary

DT plot tool


DT Run Summary

Extension of the central RunSummary for DT specific information

It can be accessed independently from the DT subdetector side, and it’s also linked inside the general RunSummary

Select a particular run

A group of runs with certain features

Or a list with the last runs with DTs

To be used :

DT part of Global RunSummary: used to check DT configuration and conditions of a run.


DT Run Summary

Downtime statistics for the Lumi section associated to this run

Configuration keys for the selected run (DAQ, Trigger, MC...)

ROS & DDU status saved by DAQ (every 2 minutes) are registered

List of errors at the beginning and end of the run


DT Run Summary

List of CCB errors during the run

Links to DCS LastValue for the start and stop of run times (“Snapshots” of detector statuses at those times)

List 10 previous and 10 latter runs


DT Plot tool

  • Tool DT-related variables. For the time being:
    • High Voltage
    • Low Voltage
    • Trigger SC variables
      • (... more in the future)

To be used :

Retrieve historical values of these variables


DT PageZero

Overview of full DT detector as registered in the DB

Still a *very* preliminary version...

Autorefresh period

Last 10 runs with DT

HV/LV status

Links to LastValue tool

ROS/DDU errors in last run

Links to ROS/DDU monitor pages

MC status and CCB errors

Link to Dashboard

Trigger Sector Collector status

Link to Trigger Supervisor DT cell

To be used :

First glimpse of DT status

Gateway to the rest of control / monitor tools


DT HV monitoring

Tool to debug HV behaviour (mostly for experts)

Dedicated analysis table in DB continuously running: currents in all channels are processed, and a flag is assigned to each HV channel, depending on on/off status, number of spikes (OvC), trips, etc.

To be used :

Track long term HV behaviour of DT chambers

Snapshot of HV status corresponding to last 48 hours

(historical snapshots can be obtained)


DT HV monitoring

For any selected chamber, a table with all channels status is shown

Direct link to DT Plot Tool

Table with historic values of HV diagnosis

(all OvCs, all trips, all OFF periods for a given channel on a single table)



  • WBM is a very useful tool for the monitoring of our detector (it is indeed *THE* official tool maintained by the CMS community).
  • Tools under development, changes are frequent. Stay tuned and check twiki for changes
  • General twiki
  • DT twiki
  • Shifters are key users of WBM, any improvement, suggestion, bug, etc you notice, let me/us know.
  • Feel free to play with these and any other tools, and provide feedback.