Difference between revisions of "Fall 2014 Commissioning Simulations"
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===General Info=== | ===General Info=== | ||
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===Overall hadronic rate=== | ===Overall hadronic rate=== | ||
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Assume 50 nA CW electron beam | Assume 50 nA CW electron beam | ||
Revision as of 20:53, 31 March 2015
Contents
Overview
This page is for the organization and sharing of information about simulations for the Fall 2014 Commissioning data.
General Info
Conditions
- Software - static conditions page
- branches/sim-recon-commissioning
- branches/hdds-commissioning
- JANA 0.7.2
- CCDB 1.03
- JANA_CALIB_CONTEXT="variation=mc calibtime=2014-09-30"
- 200M bggen events with Solenoid @ 0 A and 1200 A
- Assume unpolarized photon beam 1-10 MHz/GeV at the endpoint
- BG parameters: min E(g) = 1.2 MeV, BGRATE 1.10, BGGATE -800. 800.,
How to Access Simulated Data
The files can be found at the following location:
How to Run Over Simulated Data
To set up the environment on the JLab CUE, using the following script
source /group/halld/Software/conditions/detcom/01/conditions/setup_jlab.csh
Since each run is generated with a different non-standard magnetic field, your analysis program (e.g. hd_root) must be passed the following parameters:
- Run 9101 (1200A): -PBFIELD_MAP=Magnets/Solenoid/solenoid_1200A_poisson_20140520
- Run 9102 (No field): -PBFIELD_TYPE=NoField
- Run 9103 (300A): -PBFIELD_MAP=Magnets/Solenoid/solenoid_300A_poisson_20140819
If running over EVIO files, the environment variable JANA_CALIB_CONTEXT MUST contain a reference to "variation=mc", e.g.,
JANA_CALIB_CONTEXT="variation=mc calibtime=2014-09-15"
Beam Simulations
EM Background Simulations
The goal of these simulations is to determine the lowest field at which the solenoid magnet can be run while not having the detector overwhelmed with signals from background beam photons. The FDC and FCAL are the limiting factors.
- The zero magnetic field simulations described above.
- 1M each with Solenoid @ 50 A, 100 A, 200 A, 300 A
Other questions
- What is the background rate with no target?
- What is the background rate with various targets?
Hadronic Event Simulations
Overall hadronic rate
Reference: Fall 2014 Commissioning Plan
Assume 50 nA CW electron beam
| 1.5 µm Al | 10 µm Al | 30 µm Al | |
| 10mm CH2 | |||
| 2mm CH2 | |||
| 2/7mm CH2 | |||
| 3.4mm graphite |
Final States
These reactions can be used either as benchmarks due to their large cross section or are interesting to various subdetectors
- γp→π+π-p
- γp→π+π-π0(p), π0→γγ
- γp→π+π-π+π-(p)
- γp→ηπ+π-(p), η→γγ
- γp→K+K-π+π-(p)
- γp→K+Λ, Λ→pπ-
