Difference between revisions of "Start Counter In Calibration Challenge"

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(2) ST_Tresolution)
(st_tw_corr_auto)
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* 4) Start Counter Attenuation Corrections Plugin
 
* 4) Start Counter Attenuation Corrections Plugin
  
== st_tw_corr_auto ==
+
== ST Time Walk Plugin "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.
 
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.
  

Revision as of 11:44, 23 January 2016

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

ST Time Walk Plugin "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")

ST_Propagation_Time

This plugin must run after we have the walk corrected times from the ST and TOF. The first pass of this plugin will generate a ROOT file from an EVIO data file that contains histograms of the ST propagation time versus Z coordinate of the ST hit location for all 30 start counter sectors. A separate ROOT macro (st_prop_time_v1.C) will analyze and fit these histograms and provide a table for the CCDB through an output text file named (st_prop_time_constants.txt). In order to add these constants to the CCDB use the Command :

Add  propagation_time_corr st_prop_time_constants.txt

To check that these constants work fine run the plugin in the second pass using the command:

hd_root -PPLUGINS=st_tw_corr_auto /path/to/datafile 

Then run the macro st_prop_time_corr_v1.C using the command:

.x st_prop_time_corr_v1.C("hd_root.root")

When the corrected times are calculated use the ST_Tresolution plugin to calculate the ST time resolution.

ST_Tresolution

This plugin must run after the ST propagation time constants are uploaded in the CCDB. This plugin will generate a ROOT file from an EVIO data file that contains histograms of the ST corrected time for each paddle versus Z coordinate of the ST hit location. To run the plugin use the hd_root command mentioned in section 1 of this page. To run the macro use the command :

.x st_time_resolution.C("hd_root.root")

The output of this macro will be 30 canvas of the two dimensional histograms mentioned above in addition to Y projection of these histograms. The time resolution will be ploted in another canvas.