Lead Glass

From APEXwiki

Contents 1 Overview 2 Amplitudes alignment 3 Coordinates calibration 3.1 HRS-L 3.2 HRS-R 4 Files 5 References

Overview

• Persons in charge: Ran and Ishay
• Past experts: Bo, Ramesh
• Detector location
• wire map:
  • HV
  • scalers
  • ADC
  • TDC
• Readme
• Reported problems

Amplitudes alignment

The idea is to align the ADC signals by calibrating the gain & peds DB coefficients. This is done using a script by Yi which fits the signal and peds peaks for each ADC, and then calculate the coefficients for conversion of the amplitude to energy by minimization of chi^2 of the width of (E-p)^2

To run it:

• Step 1 - Produce a pedestal run and a signal run for each spectrometer.
• Step 2 - Run the calibration tool. The script will ask for a pedestal run and a signal run.

It will then fit the pedestal and signal peaks for each ADC and ask for your confirmation for example:

• Step 3 - Calibration check:

plot E = PR1+PR2 vs p (from vdc):
.
. Identify the Pion and Electron blobs.

• Step 4 - Install the new DB and estimate resolution by plotting E/p.

Coordinates calibration

HRS-L

HRS-R

Files

• Coda data base
• Data base for pedestals

References

• Tool by Ran (under development)
• Tools by Yi of E04-012
• Bo's calibration tools directory: /w/work5602/transversity/zhaobo/aytest/onlana/test/
• description of RHRS calibration of E97-110