Status of HyCal reconstruction in PrimEx
(Comparison with Collaboration meeting, July 2005).

Planning: Snake Calibration
 
Preparation for final calibration:

• Finish tagger reconstruction – include beam energy  (Eric?)
• Probably finished - September 21
• checking of the swapped channels is not finished - nobody can guarantee that swapped channels correction is good. (it is not important for calibration - I skipped all swapped channels).
  
• Software (Leakage of the cluster)
• Investigate leakage procedure (see recommendations from software technical meeting).  - nobody is working
• Add shower leakage inside calorimeter (Vasiliy) - will not use
  
• Add shower leakage to holes (Vasiliy)  -
  
• introduced for Calibration program, need to adjust for transition region
  
• after adjustment, should be also added to hycal library.
• Find bad/noisy channels and describe them as holes (who?)
• Found two "holes" during snake 2
• Nobody is checking now for Production Data (Mike Wood volunteered to do checks for production data)
  
• Finish sparcification cuts (Dustin?) - nobody is working
  

Status  of calibration:

• Repeat calibration with following correction:
  
• Take into account actual photon energy:
• New tagger calibration constants
• electron beam energy (Hall C)
• Take into account leakage
• Ashot proposed to check another leakage method (Kelly is working)
  
• Status:
• All software is prepared for two different methods (iteration and matrix inversion)
• ROOT Tree software is prepared
• ROOT Tree files are prepared
• Snake 2 - 100%
• Snake 1 - 70%
• (Time to do Calibration when Trees are ready about 1 day for each method for defined cuts)
  
• Cuts for Calibration are defined
  
• Use all energy range for calibration
• Energy range is selected (between 4. and 4.75 GeV)
• Central cells for snake 2 are calibrated
• Iteration method Snake 2 calibration is starting today
  
• Repeat energy dependence - after calibration
• Final study of energy resolution using calibration data, including dependence on beam energy, individual for channels ... (prepare all required for publication).

Long term stability

• Comparison of the first and second snake calibrations (electron and LMS) – Dustin
• Have to be repeated for new Calibration constants
  
• LMS correction  - not finished
  
• Compton calibration data (Elena) - in process
  
• Single arm Compton for production runs - under preparation (Kelly and Elena)
  
• Pair production - nobody is working
  
• pi-0 data - nobody is working, but is crucial (see Dustin study).

Cluster code to do.

• Cross-check of new cluster code (Dustin) -
  
• Check shower leakage outside (recommendations from soft. techn.)
• Introduce shower leakage inside - not necessary
  
• Study energy and coordinate reconstruction in transition region
• energy reconstruction is good
• coordinate reconstruction is not satisfactory:
  
• Kelly is working on it
• I will start required study immediately after calibration
  
• Correction on beam angle and position - nobody is working on real beam position and real Survey.
  
• Introduce leakage inside “holes”
• introduced for Calibration
• will be added to main code after transition region check
  
• Introduce “electron depth (and energy?) correction” - not so important now
  
• Overlapping showers algorithm - not so important now
• New hot item: linearity of the energy reconstruction
• Fast study for sparcification was done, but insufficient
  
• Better study is required for sparcification
• The influence of light loss is important (probably data for glass will be simulated in Protvino).
  

Timing links to do

• Cross-check code
• Study and define all required cuts
• Study efficiency of the timing  reconstruction (and time offsets??) using snake calibration data
• New possible timing (total HyCal sum is under investigation) - Dustin
  

Compton calibration (Elena)

Preparations for final Compton calibration procedure:

• Beam position and angle required !!! - now it simply stopping of the procedure.
• Real Detector Survey is crucial - stopping the procedure!!!
  
• Final tagger energy reconstruction
• Software: add matrix inversion method.
• Comparison with snake calibration - it is clearly seen the calibration is important.
  
• Comparison of the LMS and Compton calibration - not finished, final calibration is required
  
• Compare different coordinate reconstruction methods
• Single arm Compton Calibration on Compton (and production!?) runs (Kelly and Elena are working on the method)
  
• Pair production calibration is required (who ?!!! ) - nobody

Detector stability and required checks

• DAQ errors and it's recovery
• Sparcification cut investigation (Nick's talk)
• Bad/noisy channels (ADC's)
• Trigger group stability
• Trigger threshold and the stability

       Mike Wood volunteered to supervise it

Efficiency of the reconstruction
    Mike Wood is working on MC simulation

• Trigger efficiency for whole detector and each strip/quadrant on energy
• Influence of the different cuts on reconstruction efficiency:
• Timing cuts;
• Cluster energy cuts;
• Elasticity cuts;
• ...