Location of reconstruction libs, where the calibration is used:

halld_recon/src/libraries/TAGGER

DTAGMHit_factory_Calib.cc


// ADC time
hit->time_fadc = T * fadc_t_scale - fadc_time_offsets[row][column] + t_base;

// TDC time
double T = locTTabUtilities->Convert_DigiTimeToNs_F1TDC(digihit) - tdc_time_offsets[row][column] + t_tdc_base;

// TDC time-walk correction
T -= c1*pow(1/(P+c3),c2) - (t0 - c0);
hit->t = T;

TDC time-walk corrected time is used in the analyses


List of required calibration constants:
---------------------------------------

fadc_time_offsets[row][column]     //   CCDB table  'fadc_time_offsets'
tdc_time_offsets[row][column]      //   CCDB table  'tdc_time_offsets'

t_base, t_tdc_base                 //   CCDB table  'base_time_offset'

Time-walk corrections:
c0, c1, c2, threshold, reference   //   CCDB table  'tdc_timewalk_corrections' 





----------------------------------------

Some usefull commands to check CCDB (DO NOT WRITE TO THE CCDB)


make sure that you set (should be set automatically when source env_file )

setenv JANA_CALIB_URL mysql://ccdb_user@hallddb.jlab.org/ccdb
setenv CCDB_CONNECTION ${JANA_CALIB_URL}




> ccdb ls /PHOTON_BEAM/microscope

scaled_energy_range
fadc_gains
fadc_time_offsets
tdc_time_offsets
fiber_quality
fadc_pedestals
base_time_offset
tdc_timewalk_corrections
integral_cuts


ccdb cat /PHOTON_BEAM/microscope/base_time_offset

+---------------------------------------------------+
| TAGM_BASE_TIME_OFFSET | TAGM_TDC_BASE_TIME_OFFSET |
| double                | double                    |
+---------------------------------------------------+
| -168.136              | -152.009                  |
+---------------------------------------------------+



Location of scripts for calibration:
-------------------------------------


halld_recon/src/plugins/Calibration/TAGH_timewalk
halld_recon/src/plugins/Calibration/TAGM_TW

halld_recon/src/plugins/Calibration/PS_timing
compton_mc/halld_recon/src/plugins/Calibration/PSC_TW



Location of root histograms, which are used for calibration (an example):
-------------------------------------------------------------------------


/cache/halld/RunPeriod-2019-11/calib/ver56/hists/Run072852


root -L hd_calib_verify_Run072852_003.root