Fall 2014 Commissioning Simulations
This page is for the organization and sharing of information about simulations for the Fall 2014 Commissioning data.
- Software - static conditions page
- Note that the special sim-recon & HDDS branches sim-recon-commissioning and hdds-commissioning are required to analyze this data, as they have special configurations for the thin plastic target used instead of the nominal LH2 target.
- Default JANA_CALIB_CONTEXT="variation=mc calibtime=2014-11-06"
- 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.
- Generic bggen events were generated with different magnetic field settings - see conditions page for details on run and file numbers.
How to Access Simulated Data
The files can be found at the following location:
The subdirectories most people are probably interested are:
- smeared - Output of mcsmear
- rest - Fully reconstructed REST files
How to Run Over Simulated Data
To set up the environment on the JLab CUE, using the following script
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
The environment variable JANA_CALIB_CONTEXT MUST contain a reference to "variation=mc", the default being:
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
- 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|
These reactions can be used either as benchmarks due to their large cross section or are interesting to various subdetectors
- γp→π+π-π0(p), π0→γγ
- γp→ηπ+π-(p), η→γγ
- γp→K+Λ, Λ→pπ-