Difference between revisions of "Start Counter Background Studies"

Revision as of 09:40, 14 June 2012

$ genphoton -M 100000 -Pmax 0.00001 -Pmin 0.000005 -Thetamin 0. -Thetamax 0.001 -o file_out.ascii

Convert the ascii events into HDDM format and smear the z-vertex across the entire 30cm long target

NB: This step is not necessary as HDGEANT automatically smears the vertex across all three dimensions

$ genr8_2_hddm -V"0 0 50 80" file_out.ascii

Use the following control.in file to process the events through HDGEANT (from latest sim-recon version) [3]
- The minimum energy for the photon beam was lowered to 1.2 MeV to look at hits contribution in SC from 50 MeV photons: BEAM 12. 9. 0.0012
- The background rate or flux for this minimum energy is 2.2e9 photons/s: BGRATE 2.2
- The photon pileup window is set to 100ns: BGGATE 0. 100.
- The following EM processes are turned on:
  - Compton Scattering: COMP 1
  - Pair Production: PAIR 1
  - Energy Loss: LOSS 1
Additional cuts in HDGEANT:
- The energy threshold in for hits in SC is 150 MeV
- The time window for two hit resolution is 25 ns
The hits are then smeared using mcsmear
Plots
- Rates [4]
- Hit Multiplicity [5]
- R vs Z hit [6]
- Y vs X hit [7]

@@ Line 2: / Line 2: @@
 * Sasha's Howto [https://halldweb1.jlab.org/wiki/index.php/HOWTO_to_generate_electromagnetic_background]
-===EM Background===
+=== Pure EM Background ===
-* Generated
+* Generated 100K dummy events using
+ '''$ genphoton -M 100000 -Pmax 0.00001 -Pmin 0.000005 -Thetamin 0. -Thetamax 0.001 -o file_out.ascii'''
+* Convert the ascii events into HDDM format and smear the z-vertex across the entire 30cm long target
+''NB: This step is not necessary as HDGEANT automatically smears the vertex across all three dimensions''
+ '''$ genr8_2_hddm -V"0 0 50 80" file_out.ascii'''
+* Use the following control.in file to process the events through HDGEANT (from latest sim-recon version) [https://halldweb1.jlab.org/talks/2012-2Q/background/em_control.in]
+** The minimum energy for the photon beam was lowered to 1.2 MeV to look at hits contribution in SC from 50 MeV photons: '''BEAM 12. 9. 0.0012'''
+** The background rate or flux for this minimum energy is 2.2e9 photons/s: '''BGRATE 2.2'''
+** The photon pileup window is set to 100ns: '''BGGATE 0. 100.'''
+** The following EM processes are turned on:
+*** Compton Scattering: '''COMP 1'''
+*** Pair Production: '''PAIR 1'''
+*** Energy Loss: '''LOSS 1'''
+* Additional cuts in HDGEANT:
+** The energy threshold in for hits in SC is 150 MeV
+** The time window for two hit resolution is 25 ns
+* The hits are then smeared using mcsmear
 * Plots
 ** Rates [https://halldweb1.jlab.org/talks/2012-2Q/background/em_paddle_1.png]