Data Analysis - General Parameters
General Parameters
Common global parameters used for the hall C beamline and debug mode are stored in the PARAM/GEN/ directory. There used to be energy loss parameters included in this directory for the old Fortran analyzer. Hcana no longer calculates energy loss, so those variables have been removed. The main parameters of this section are the BCM scalers and the BPM positions from HARP scans and the raster conversions. These aspects have their own devoted analysis section.
General Files
- PARAM/GEN/genflags.param - Only includes the gen_run_starting_event parameter.
- PARAM/GEN/gdebug.param - No used parameters
- PARAM/GEN/gtarget.param - No used parameters, Eloss not included in hcana. Eloss handeled in rc-externals
- PARAM/GEN/gbeam.param - Calibration of beam position on target and raster settings.
- PARAM/GEN/gscalers.param - Calibration of scaler BCM branches. Must be set before running the BCM calibration procedure.
gscalers
gscalers.param gNumBCMs = 6 gBCM_Names = " BCM1 BCM2 Unser BCM4A BCM4B BCM4C" gBCM_Gain = 4795.0, 4092.0, 4000.0, 13020.0, 2042.0, 6238.0 gBCM_Offset = 250300.0, 250200.0, 393000.0, 432.4, 204.9, 127.8 gBCM_Current_threshold = 5.0
- index = 0 to gNumBCMs-1
gBCM_Current_threshold_index = 3
gbeam
gbeam_sp18.param
- BPM calibration constants
- =========================
- average beam positions
- Use the Hall C EPICS BPM values in units of cm
- gbeam_x = +0.00
- gbeam_xp = +0.00
- gbeam_y = +0.00
- gbeam_yp = +0.00
- Add new variables for Hall C BPM A, B, and C, based on HARP calibration
- Updated by Dave Gaskell
gbpmxa_slope = -0.98 gbpmxa_off = -0.05 gbpmxb_slope = -1.12 gbpmxb_off = +0.08 gbpmxc_slope = -0.96 gbpmxc_off = -0.89 gbpmya_slope = 0.97 gbpmya_off = -0.20 gbpmyb_slope = 1.17 gbpmyb_off = 0.38 gbpmyc_slope = 0.87 gbpmyc_off = 0.47
- positions of BPMs relative to target (from DIMAD)
- gbpma_zpos = 370.82 ; cm
- gbpmb_zpos = 224.96 ; cm
- gbpmc_zpos = 129.30 ; cm
- positions of BPMs relative to target (from Fall 2017 survey)
gbpma_zpos = 320.42 ; cm gbpmb_zpos = 224.86 ; cm gbpmc_zpos = 129.44 ; cm
- positions of BPMs relative to target (from Fall 2018 survey)
- gbpma_zpos = 320.17 ; cm
- gbpmb_zpos = 224.81 ; cm
- gbpmc_zpos = 129.38 ; cm
- Fast Raster calibration constants
- =================================
gusefr = 1
- flag if 1 fast raster data used with average beam pos and angles in
- calculating beam position
- if 0 then only use average beam pos and angles in calculating beam position
- Various fast raster quantities
- gUse* are flags
- Raster constants determined from coin run 4556 on Aug 20, 2018
- gfr_cal_mom = 8.518
- gfrxa_adc_zero_offset = 64150
- gfrxb_adc_zero_offset = 66250
- gfrya_adc_zero_offset = 67700
- gfryb_adc_zero_offset = 64100
- gfrxa_adcpercm = 158000
- gfrxb_adcpercm = 147000
- gfrya_adcpercm = 155500
- gfryb_adcpercm = 157500
gfr_cal_mom = 6.4 ; = beam momentum during jan 2018 3 pass
gfrya_adcpercm = (77755.-57411.)/.2;
gfryb_adcpercm = (71093.-52056.)/.2;
gfrxa_adcpercm = (75733.-51938.)/.2;
gfrxb_adcpercm = (79778.-57293.)/.2;
gfrya_adc_zero_offset = (77755.+57411.)/2.; gfryb_adc_zero_offset = (71093.+52056.)/2.; gfrxa_adc_zero_offset = (75733.+51938.)/2.; gfrxb_adc_zero_offset = (79778.+57293.)/2. ;
- positions of FR magnets relative to target
gfrx_dist = 1375 ; cm gfry_dist = 1337 ; cm
The general parameters are largely unused, but those that are used are quite significant. Parameters generally not associated with either spectrometer are stored here. The ones of interest are the debug parameters, beam parameters, raster parameters, and BCM scaler parameters.
A list of unused parameters is included here as well. To set the beam, raster, and BCM parameters, a devoted data analysis section is going to be made.
