Difference between revisions of "Start Counter Background Studies"
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(Created page with "* Seema and Sasha's Old Background Study: [https://halldweb1.jlab.org/talks/2012-2Q/background/SC_simulations.pdf] * Sasha's Howto [https://halldweb1.jlab.org/wiki/index.php/HOWT...") |
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* Sasha's Howto [https://halldweb1.jlab.org/wiki/index.php/HOWTO_to_generate_electromagnetic_background] | * 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 | * Plots | ||
** Rates [https://halldweb1.jlab.org/talks/2012-2Q/background/em_paddle_1.png] | ** Rates [https://halldweb1.jlab.org/talks/2012-2Q/background/em_paddle_1.png] |
Revision as of 09:40, 14 June 2012
Pure EM Background
- 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) [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