Welcome to the LHCb Alignment Web Page

Alignment Subtasks

• Conveners: Wouter Hulsbergen and Silvia Borghi
• Alignment software coordination: Johan Blouw
• VELO alignment: Silvia Borghi (convener), Marco Gersabeck, Chris Parkes
• TT alignment: Jeroen van Tilburg, Christophe Salzmann
• IT alignment: Matthew Needham, Adlene Hicheur, Louis Nicolas, Vincent Fave, Florin Maciuc
• OT alignment: Johan Blouw, Jan Amoraal, Marc Deissenroth
• Muon alignment: Stefania Vecchi, Silvia Pozzi
• RICH Alignment: Antonis Papenestis
• Global alignment: Steven Blusk
• AlignmentMonitoring
• AlignmentOpenIssues
• Alignment problems database

Tools for Alignment

• Introduction to running the Alignment

• Geometry Framework
• Protocol for uploading new calibration and alignment constants from CAF jobs ('Quasi-Online-Calibration')
• Manual for alignment framework ('Kalman')

How To:

• Various How To's with the Conditions Database
• HowToCreateCondDB: How to Create a local copy of the Conditions Database
• HowToBrowseCondDB: How to Browse the Conditions Database (LHCBCOND.db)
• How to create a misaligned Conditions DB
• How to access the energy deposit in the calorimeters (e.g. to get a momentum estimate for magnet-off runs)
• How to use the GUI for the Offline Alignment Monitoring

Data sets

• Alignment Samples
• Special Data Sets for Alignment
• Bookkeeping Database
• Alignment databases

LHCb Tracking & Alignment Workshops and Other Relevant Meetings

• April 7-11, 2008: Alignment working week 3 @ CERN
• Feb 27-29, 2008: Tracking & Alignment Workshop @ Ferarra
• Feb 11-15, 2008: Alignment Working Week 2 @ CERN
• Jan 7-11, 2008: Alignment Working Week 1 @ CERN
• Aug 29-31, 2007: Tracking & Alignment Workshop @ Amsterdam
• Aug 3, 2007: Alignment Meeting @ CERN
• Feb 22-23, 2007: Tracking & Alignment Workshop @ Heidelberg
• Nov 8-9, 2006: Tracking & Alignment Workshop @ Lausanne
• July 13-14, 2006: Tracking Workshop @ Zurich
• Jan 12-13, 2006: @ Alignment Workshop @ Cambridge
• Oct 31-Nov 1, 2005: Tracking & Alignment Workshop @ Glasgow

LHC Detector Alignment Workshops

• LHC Detector Alignment Workshop - 2, June 25-26, 2007
• LHC Detector Alignment Workshop - 1, Sept 4-6 2006

Presentations

• Survey Task Force Reports, May 2007 Software Week
• T-REC Meeting, Juan Palacios on local-to-global transformations, and Marco Clemencic, on implementation of Survey data into Geom DB or Cond DB
• Wouter Hulsbergen on alignment with Kalman filter tracks in the LHC alignment workshop

Publications, public notes

• J. Amoraal, "Alignment of the LHCb detector with Kalman filter fitted tracks." LHCb-CONF-2009-026; CERN-LHCb-CONF-2009-026

• M. Deissenroth, "Experience with LHCb alignment software on first data" LHCb-CONF-2009-009; CERN-LHCb-CONF-2009-009

• A. Hicheur, M. Needham, L. Nicolas, , J. Amoraal, W. Hulsbergen, G. Raven, , "First studies of T-station alignment with simulated data.", CERN-LHCB-2008-065, Mar 2009. 35pp.

• L. Nicolas, A. Hicheur, M. Needham, J. Amoraal, W. Hulsbergen, G. Raven, "Alignment of LHCb tracking stations with tracks fitted with a Kalman filter", CERN-LHCB-2008-066, LPHE-2008-14, Dec 2008. 6pp.

• W. Hulsbergen, "The Global covariance matrix of tracks fitted with a Kalman filter and an application in detector alignment.", Nucl.Instrum.Meth.A600:471-477,2009. [doi:10.1016/j.nima.2008.11.094 ], arXiv:0810.2241 [physics.ins-det]

• S. Viret, C. Parkes, M. Gersabeck, "Alignment procedure of the LHCb Vertex Detector", Nucl. Instr. and Meth. A596 (2008) 157-163, doi:10.1016/j.nima.2008.07.153 [arXiv:0807.5067]

• M. Gersabeck et al., "Performance of the LHCb Vertex Detector Alignment Algorithm determined with Beam Test Data", Nucl. Instr. and Meth. A596 (2008) 164-171, doi:10.1016/j.nima.2008.07.154 [arXiv:0807.5069]

Recent LHCb notes

• M. Needham, "First alignment of the Inner Tracker using data from the TI-8 sector test", LHCb-2009-030 ; CERN-LHCb-2009-030 ; LPHE-Note-2009-02
• L. Nicolas et al, "Alignment of LHCb tracking stations with tracks fitted with a Kalman filter", LHCb-2008-066 ; CERN-LHCb-2008-066
• L. Nicolas et al, "First studies of T-station alignment with simulated data", LHCb-2008-065 ; CERN-LHCb-2008-065

Subset of relevant non-lhcb references

• V. Blobel, "Software alignment for tracking detectors" (2006). Publication for millepede
• V. Blobel, "Alignment algorithms" (2007): Overview of different alignment algorithms for the LHC alignment workshop
• P. Bruckman, A. Hicheur and S.J. Haywood, "Global chi2 apprach to the alignment of the ATLAS silicon tracking detectors" : another formulation of the closed form alignment approach
• A. Bocci and W. Hulsbergen, "TRT Alignment For SR1 Cosmics and Beyond" (2007): alternative (short) formulation of the closed-form alignment approach.

Hardware Alignment Systems

• RASNIK system:
  • RASNIK System for Outer Tracker, June 2007 (LHCb password required)
  • CDS Notes
• RICH Laser Alignment System
  • Ph.D. Thesis by Andres Macgregor

Alignment Working Week Tests

* Data used: minimum bias on beam-gas events at 450GeV,

• reconstructed with tag DC06-repro0710: /castor/cern.ch/user/j/jblouw/FieldOff_450GeV.dst
• reconstructed with tag AW2_IT_OT_01 : castor/cern.ch/user/j/jblouw/FieldOff_450GeV_AW2_IT_OT_01.dst

* Tags in the conditions dbase (/castor/cern.ch/user/j/jblouw/LHCBCOND.db) with shifts/rotations of layers:

Det	dbase-tag	Tx	Ty	Tz	Rx	Ry	Rz
OT	AW2_IT_OT_01	1.0mm	1.0mm	fixed	fixed	0.4mrad	0.4mrad
IT	AW2_IT_OT_01	0.1mm	0.1mm	fixed	fixed	0.1mrad	0.1mrad
OT	AW2_OT_IT_03	1.0mm	fixed	fixed	fixed	0.4mrad	0.4mrad
IT	AW2_OT_IT_03	0.1mm	fixed	fixed	fixed	1.0mrad	1.0mrad
OT	AW2_OT_IT_04	1.0mm	fixed	1.0mm	0.4mrad	fixed	0.4mrad
IT	AW2_OT_IT_04	0.1mm	fixed	fixed	1.0mrad	fixed	1.0mrad

Note that for all cases, the first 2 and last 2 layers have not been shifted/rotated.

-- StevenBlusk - 13 Nov 2006