New fieldmaps

125acm2_3kg_corrected_unfolded_scaled_0.7992_v2.tar.gz

Recon classes

Accessing full field-map

• TrackDataDriver: By in extrapolation from Layer6 to ECal
• TrackUtils > extrapolateTrackUsingFieldMap: By

Accessing at tracker centre

• TrackDataDriver: By for track intercepts with sensors
• SeedTracker: By
• BilliorVertexer: By
• MakeGblTracks: |B|
• TrackUtils >
  • extrapolateTrackPositionToSensor: By
  • getHelixPlaneIntercept: By
  • extrapolateTrack: By

Recon studies affected

• Track extrapolation to ECal / track-cluster matching
• Top-bottom asymmetry
• Beam slope MC

Analysis results affected

MC samples requiring re-generation

Field Map Plots

B_Y as a function of z along the z axis.

A few values from the old map:

z= 0           By = -0.19767       0.824   ~target
z= 90       By = -0.23610       0.984   ~L1
z= 400   By = -0.24000       1.000   ~L4
z= 900   By = -0.20907       0.871   ~L6  

 z=1339 ~ECal scoring plane

 z=1395 ~Ecal crystal front face plane

Plots from the (correct) txt files: Bfieldmap.pdf

Things to check

• Symmetries of the seven octants into which the field map is expanded
• First derivatives along octant boundaries
• Smoothness of point where calculation and explicit field map measurements are merged (around z=1m in above plot)
• Make sure fields are renamed to preserve provenance.
• Make sure new fields are copied to all public locations
• Make sure all compact.xml files are modified and lcdd files are regenerated.
• Check log files on new MC/recon/analysis production jobs to ensure new fields are being picked up and used.