Minutes of the HEC/FCAL Testbeam Analysis Meeting from 26.4.00.
-----------------------------------------------------------------------

1. HEC: News from Testbeam MC
   (A. Kiryunin)
   

   Andrej presented the status of the HEC Testbeam Simulation program 
   HEC-BEAM version 3.1. The pion and electron response has been
   simulated at 5 different impact points, the muon response at one impact
   point. The dependence of the energy leakage on the impact position
   is clearly visible, for pions it varies between 3 % and 4 %.
   The new version  3.2 keeps track of all energy losses: LAr excluder,
   cryostat wall and all in-active volumina (cracks, tie-rods etc.).
   The longitudinal segmentation is extremely fine (all individual layers),
   but the lateral segmentation is rather coarse so far.
   First results show that the typical energy losses in the tie rods
   are at the level of 2 %. The response in the 4 subgaps shows a typical
   variation of 1 % - 4 %, depending on the particle energy. This
   variation is presumably due to the fact that low momentum particles 
   starting in the Cu plate range out in the various subgaps.
   

2. A First Comparison of GEANT 4 and GEANT 3 Simulations for Electrons
   in the FCAL Module 0 Testbeam.
   (R. Mazini, P. Loch)
   
   
   Peter presented the results from Rachid. The geometrical description
   is identical in both versions including all details like upstream
   and downstream detectors, cryostat wall, and calorimeter segmentation.
   Electrons of 60 and 120 GeV have been simulated. The mean energy
   response as well as the RMS compare rather well: the mean differs
   at most by 0.5 %, the sigma by up to 10 %. 
   

3. HEC: Summary of the Technical Run in February 2000.
   (L. Kurchaninov, P. Stavina, P. Strizenec)
   
   
   Andrej presented the results of the last technical run. In total more 
   than 1800 files have been taken, tracing the calibration signals thru 
   the full electronic chain: calibration board, feed thru, calibration 
   cable, patch panel, calibration distribution board, signal strip line,
   signal cables, PSB, signal patch panel, feed thru, FEB and ADC cables.
   The calibration chain model used in 99 took the various components into
   account, but the parameters used relied on lab measurements.
   The new findings are: the calibration generator pulse
   depends on the termination condition and the calibration cables show
   a different behaviour. All 14 parameters of the calibration chain
   differ somewhat from the Model-99. 
   On the signal chain the main difference is the ADC cable, which has
   been not taken into account previously. Except for the pre-shaper
   time constant, the parameters (in total 14) do not differ very much
   from the Model-99.
   The goal of the Model-2000 is to produce reference signals for the
   module acceptance tests and to improve the calibration in order to
   reach a precision of typically 0.5 %.
   For the conversion of MeV to nA a value of 7.77 nA/MeV is obtained,
   in good agreement with the expected value of 7.70 nA/MeV.