Difference between revisions of "February 26, 2014 Calibration"

Revision as of 18:07, 26 February 2014

Meeting Time and Place

Wednesday January 15, 2013 at 11:00 AM. At Jefferson Lab, the meeting will be held in F326

Connections

To connect from the outside, please use ESNET

1. ) ESNET: 8542553
   
2. )To connect by telephone, dial:

• You can look up toll-free number at http://www.readytalk.com/intl
• US and Canada: (866)740-1260 (toll free)
  
• International: (303)248-0285 (toll call)
• enter access code followed by the # sign: 3421244#
  

Agenda

1. Announcements
2. Status Update
3. Tracking
4. Calorimetry
5. Other systems
   • Photon Beam
6. Simulations and Calibrations

Minutes

Attending: Sean, Amiran (NU); Curtis (CMU); Simon, Beni, Mike, Eugene, Lubomir, Mark I. (JLab); Zisis (Regina); Richard (UConn); Justin (MIT)

1. Status Update
   • Not much new since the Collaboration Meeting last week.
   • Sean proposed to have a few dedicated meetings for the purpose of integrating the constants into the reconstruction and simulation codes after the upcoming data challenge.
2. Tracking
   • Naomi reported (in absentia) that she is generating the Garfield tables needed for the CDC time-to-distance relations.
3. Other systems
   • Richard described the current ideas of what constants will be needed for the photon beamline detectors. There is a wiki page on this subject that he will provide a link to.
   • Discussion started with the tagger microscope
     • Each fiber is associated with a TDC and fADC250 channel. The TDC will need a time offset, and the fADC will need a gain factor and time offset.
     • The ADC pulse shape will be used to match fADC and TDC hits, and the ADC pulse height will be used to determine timewalk corrections for the TDC hits.
     • There are 120 channels in the microscope.
     • There should be 5 parameters per channel for the timewalk correction. The exact form of the correction is to be determined.
     • The high and low energy bounds for each channel in terms of the fraction of the endpoint energy should be stored.
     • The endpoint energy as determined in conjunction with the pair spectrometer should be stored.
     • The fixed array will need similar constants, it has 220 channels (?)
   • The active collimator is not needed for offline reconstruction
   • Pair spectrometer (PS):
     • The fine-segmented PS is purely hit-based, it checks for hits in coincidence gated with the coarse-grained PS.
     • The coarse-grained PS has 8+8 channels, each with an fADC250 channel and TDC channel, with the respective constants needed for each of them.
     • The gating threshold may also be needed for reconstruction.
   • Total absorption counter
     • 8 phototubes viewing a large block, each tube needs t0, gain factor, timewalk correction
   • Polarimetry will be discussed in the future.