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PC-2015-07-10

Present:
Celeste Pidcott
Tanaz Mohayai
Dimitrije Maletic
John Nugent
Paul Soler

Celeste Pidcott:
  • Analysis algorithm - Tim Carlisle's thesis; take a beam going through the absorber and propagate its upstream tracker reference plane p vector through the fields to the absorber; propagate it backwards through the downstream field; use propagated vectors
  • Sources of error
    • PID
    • Tracker resolution:- beam momentum dependence?
    • Misalignment of the tracker
    • Knowledge of magnetic fields
    • Windows and Helium in the tracker
    • Knowledge of the absorber density/thickness profile of the absorber
      • lH2 temperature + window geometry
      • Lithium Hydride density profile
  • Beam characteristics
    • "high statistics for an empty channel"
    • "high statistics for a full channel"
John Nugent:
  • Analysis - fit straight tracks upstream and downstream; propagate them forwards and backwards, take dot product between the two vectors, consider other materials as a systematic; angle between the two vectors is a measure of the scattering
  • Sources of error
    • Tracker to tracker misalignment
      • Liaise with Chris Hunt; straight tracks is crucial step
      • Paul Soler consider doing a "global fit" alignment i.e. invert the matrix
      • ACTION: Rogers to make a "catch-up" meeting with Chris Hunt
    • Remnant fields
      • ACTION: Rogers to send references to Nugent regarding the expansion of fields off-axis
    • Windows and Helium in the tracker
    • Knowledge of the absorber density/thickness profile of the absorber
      • lH2 temperature + window geometry
      • Lithium Hydride density profile
    • Momentum measurement with the TOF
      • Victoria Blackmore is resurrecting Mark Rayner's TOF track finding routine
    • Tracker angle exposed 60 mrad on the tracker vs 70 mrad RMS distribution width
  • Beam characteristics
    • Trigger should be TOF2
      • Clip the high-angle scatters
    • 3 pi setting, 140, 200, 240
Tanaz Mohayai:
  • Analysis - material physics measurements
    • Longitudinal emittance
    • dE/dx measurements; use the energy loss as a function of position to measure the energy loss
    • Looking at MAUS, running the simulation

Date of next meeting
Friday 17th July 15:00 BST