Release Notes for Calibration and Alignment for 310 (changes wrt 21X/22X)

General Infrastructure

Alignment Framework

A detailed trace back of new tags can be found at SWGuideTrackAlignmentVersions. The main new features are:
  • a
  • b

AlCaReco production

A common change is that the HLT paths used to select AlCaReco events are not taken from the python configuration anymore, but by the AlCaRecoTriggerBitsRcd stored in the databse account CMS_COND_31X_HLT, see SWGuideAlCaRecoTriggerBits.

Tracker Alignment

Actual Selection
  • Read HLT paths from ContDB
  • Select logical NOT from all HLT paths used in other selectors in TkAlMinBias
  • adjust to new HLT tables
  • add DQMOffline/Alignment
  • Hitmaps (x-y and r-phi)
  • Hits per moduleID
  • track selection efficiency
  • p_T by charge
  • sum of charges
  • inv. mass
  • track-track and track-jet isolation
  • curvature

Muon Alignment

Actual Selection
  • ALCARECOMuAlGlobalCosmics and ALCARECOMuAlStandAloneCosmics: minimum pT is now 10 GeV (instead of 0), and now only keep silicon tracker clusters associated with the tracks (none in the case of StandAloneCosmics)
  • ALCARECOMuAlZMuMu: actually select Z to mu mu events, instead of all muons


Tracker Calibration

Ecal Calibration

  • new Eta->gamma gamma stream
  • AlCaReco DQM in DQMOffline/CalibCalo

Hcal Calibration

DT Calibration

No prominent changes

RPC Calibration

New RPC AlCaRaw stream

Alignment and Calibration Algorithms

Tracker Alignment

Muon Alignment

HIP-based approach: new module, MuonAlignmentFromReference, which expands upon HIP by
  • using 4-D segment residuals instead of 2-D position residuals as observables
  • including alignment corrections and all known detector effects (different kinds of scattering) in a single fit per chamber
  • adjusting for potential magnetic field errors by averaging results from positive and negative muon residuals
(The 3_1_0 version of MuonAlignmentFromReference is the one that was used to make CRAFT_ALL_V13 and CRAFT0831X_V1 constants.)

MillePede-based approach: the algorithm is ported into the alignment framework

Pixel Calibration

SiStrip Calibration

Ecal Calibration

Hcal Calibration

DT Calibration

CSC Calibration

Conditions Formats


No changes - nevertheless, due to changes in the database infrastructure, it is not possible to read from database accounts of previous releases. Database experts can migrate old payloads into the account CMS_COND_31X_FROM21X, but it is not possible to append IOVs there.

Muon alignment records have a larger CSC record (more rows, not new columns) to include the new ME4/2 chambers


  • Cabling Map (SiPixelFedCablingMapRcd): Format changed. No longer contains nested vectors.
  • Lorentz Angle (SiPixelLorentzAngleRcd): no change.
  • Gain Calibration: (SiPixelGainCalibrationOfflineRcd/SiPixelGainCalibrationForHLTRcd/SiPixelGainCalibrationOfflineSimRcd/SiPixelGainCalibrationForHLTSimRcd): Object changed. Now includes a noisy flag parameter.
  • New object for 31X: Quality. (SiPixelQualityRcd): contains DetIDs and ROCs associated with those DetIDs that are considered dead.
  • New object for 31X: Template. (SiPixelTemplateDBObjectRcd): used for local pixel reconstruction.
  • New object for 31X: CPE Parm Errors. (SiPixelCPEParmErrorRcd): used for local pixel reconstruction.
  • New object for 31X: DCS Object. (PixelCaenChannelIsOnRcd/!PixelCainChannelIMonRcd/!PixelCaenChannelRcd): contains DCS information.


  • Thresholds: changed data format. Included a third threshold to hold also the cluster threshold. not compatible with previous 30X versions
  • SiStripDetVOff: introduced to hold the DCS HV/LV off list. Substitutes the SiStripModuleHV. not back-portable
  • Noise (both dec and peak mode): new fake conditions corresponding to the new electronPerAPV value (262, the old one was 274) in the simulation






-- DavidFutyan - 08 Jul 2009

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Topic revision: r10 - 2009-08-04 - StefanoArgiro
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