Start Counter In Calibration Challenge
Introduction
Currently, the plugins 1, 2, and 3 are in the sim-recon/src/plugins/Calibration. A summary of how to run each code and the expected outcomes of the macros will be shown in details.
- 1) Start Counter Time Walk Corrections Plugin (st_tw_corr_auto)
- 2) Start Counter Propagation Time Corrections Plugin (ST_Propagation_Time)
- 3) Start Counter Time Resolution Plugin (ST_Tresolution)
- 4) Start Counter Attenuation Corrections Plugin
1) st_tw_corr_auto
This plugin must run in two passes. In the first pass the parameter USE_TIMEWALK_CORRECTION = 0.Therefore this plugin will generate a ROOT file from an EVIO data file that contains histograms of the time difference (self timing) versus pedestal-subtracted pulse peak amplitude for all 30 start counter sectors. A separate ROOT macro (st_tw_fits.C) will analyze and fit these histograms and provide a table for the CCDB. After uploading the constants into the CCDB, the plugin must run the second pass where USE_TIMEWALK_CORRECTION = 1. The Walk corrected times will be calculated during this pass. The ST self timing resolution is calculated using the macro st_tw_resols.C. In this macro verification plots for each sector is also created.
Plugin Files:
JEventProcessor_st_tw_corr_auto.cc JEventProcessor_st_tw_corr_auto.h
Macros Files:
st_tw_fits.C st_tw_resols.C
To run the plugin, use the following command:
hd_root -PPLUGINS=st_tw_corr_auto /path/to/datafile
To run the first pass macro , use the command :
.x st_tw_fits.C("hd_root.root")
The file st_timewalks.txt will be created with the needed constants for the walk corrections. To upload these constants into the CCDB use the command:
Add timewalk_parms_v2 st_timewalks.txt
After running the plugin for the second time, run the macro st_tw_resols.C using the command
.x st_tw_resols.C("hd_root.root")