SCAL

SCAL Function Manager

Machines used by the SCAL Function manager can be found at: WbmMachines. In short, we have 2 machines involved in fetching, publishing and recording information: one for LHC information (cms-lhcgmt) and another one for Trigger / DAQ one (cms-scalers). Both are controled by a dedicated RCMS machine (cmsrc-scal).

Details and documentation are at the following restricted pages:

• https://svnweb.cern.ch/trac/cmswbm/wiki/ScalersSoftware
• https://svnweb.cern.ch/trac/cmswbm/wiki/ScalFunctionManager
• https://svnweb.cern.ch/trac/cmswbm/wiki/ScalDatabase
• https://svnweb.cern.ch/trac/cmswbm/wiki/TrigLumi

Main tasks done by SCAL are related to:

• LHC real-time information:
  • Retrieve (via the GMT interface)
  • Publish (in DIP)
  • Record (in DB)
  • Detect if beam status changes to/from Stable Beams and create runtime periods in DB
  • Used by DQM, Fill Summary, RTL, Lhc Monitor, Bunch Fill, Current Bunches
• GT Trigger information (including, but not limited to, Trigger rates)
  • Retrieve (via xmas::las XDAQ Trigger GT interface)
  • Publish (in SCAL XDAQ flashlists)
  • Record (DB)
  • Detect if we stop/start getting data and create downtime entries in DB
  • Add to data stream sent to Tier 0
  • Used by DQM, RTL and WBM Trigger Rates
• DCS
  • Retrieve status from CMS sub-systems (via DIP)
  • Record such status (in DB)
  • Used by
    • WBM: Last Value, Page Zero, Condition Browser, iPlot, CMS Page 1
    • DQM GUI and RunRegistry
    • Trigger monitoring scripts
• Luminosity
  • Retrieve luminosity information (via Lumi PC)
  • Record it (in DB)
  • Used by RTL, Fill Report, iPlot

This can be summarized in the following table:

Data Recorded by SCAL and Who Uses It

• BeamSpotOnline (x,y,z) position of beam, with widths and errors - used by HLT tracking triggers
• DcsStatus HV status bits of all CMS subdetectors - used by several detector DQM jobs online and offline
• L1AccceptBunchCrossing vector of the last n bunch and orbit numbers - synchronization checks by tracker
• Level1TriggerScalers list of run and current level 1 trigger counters - used by L1 online DQM for rate monitoring
• LumiScalers current values of the integrated and instantaneous luminosity - used by Lumi online DQM and HLT

In the CMSSW framework, the classes are defined in the DataFormats/Scalers package. Also note the Level1TriggerRates class, a utillity that converts triggers counts into rates. See the link http://cmssdt.cern.ch/SDT/lxr/source/DataFormats/Scalers/interface/ for class definitions.

SCAL Discussion during LS1 and related information

• 31st July 2013 SCAL discussion: agenda page
  • 20130731_CMS_SCAL_Discussion.pdf: Slides for the SCAL discussion by Bill, July 31, 2013
• 20130801-Schwick-chat-with-Venturi.eml: e-mail from Christoph, information regarding BX and Orbit numbers after talking to Andrea Venturi
• 20130801_LHC_GMT_and_PCIe.eml: LHC GMT and PCIe information from Bill after checking with LHC
• 27th August 2013 Run Coordination Meeting, with SCAL discussion: agenda page
  • SCALDiscussion-2013-08-26.pdf: "Intermediate Summary of SCAL discussion" by Christoph, Aug. 27, 2013
• 26th September 2013 Run Coordination Meeting, with SCAL and WBM status report: agenda page
  • CMS_RunCo_WBM_RTL_SCAL_2013_09_24.pdf: "WBM/SCAL status report" by Bill Badgett, Sept. 26, 2013

-- KaoriMaeshima - 2018-05-29