Difference between revisions of "Fall 2014 Commissioning Simulations"
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** Default JANA_CALIB_CONTEXT="variation=mc calibtime=2014-11-06" | ** Default JANA_CALIB_CONTEXT="variation=mc calibtime=2014-11-06" | ||
* Assume unpolarized photon beam 1-10 MHz/GeV at the endpoint | * 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. | + | ** 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 [https://halldweb.jlab.org/detcom/01/conditions/commissioning.html conditions page] for details on run and file numbers. | ||
== How to Access Simulated Data == | == How to Access Simulated Data == |
Latest revision as of 17:10, 2 June 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
- 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:
/volatile/halld/detcom_01
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
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
The environment variable JANA_CALIB_CONTEXT MUST contain a reference to "variation=mc", the default being:
JANA_CALIB_CONTEXT="variation=mc calibtime=2014-11-06"
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-