Difference between revisions of "DV RunGroupC Moller"

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==Simulation Setup==
 
==Simulation Setup==
Use GEANT4 via GEMC to estimate the Moller background for electron scattering experiments in JLab's Hall B.
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Use GEANT4 via GEMC to estimate the Moller background for electron scattering experiments in JLab's Hall B. The first step towards this goal is to use GEANT4 without the GEMC infrastructure to create event (LUND) files that will be used as input events for GEMC. 
  
 
   [[LH2 target]]
 
   [[LH2 target]]

Revision as of 17:05, 14 April 2016

need to insert moller shielding into card after moller LUND file is created. (see clas12/beamline)

Simulating the Moller scattering background for EG12

GEANT4 Simulation of Moller Events

Simulation Setup

Use GEANT4 via GEMC to estimate the Moller background for electron scattering experiments in JLab's Hall B. The first step towards this goal is to use GEANT4 without the GEMC infrastructure to create event (LUND) files that will be used as input events for GEMC.

  LH2 target

Distributions For LH2

LH2 Momentum Distribution in the Lab Frame

LH2 Angular Distribution in the Lab Frame

LH2 Momentum Distribution in the Center of Mass Frame

LH2 Angular Distribution in the Center of Mass Frame

Comparing experimental vs. theoretical for Møller differential cross section 11GeV

Converting the number of scattered electrons per scattering angle theta to a differential cross-section in barns.

Experimental and Theoretical Moller Differential Cross-Section in Center of Mass Frame Frame
Figure 5c: The experimental and theoretical Moller electron differential cross-section for an incident 11 GeV(Lab) electron in the Center of Mass frame of reference.

Change to a NH3 Target

Replacing the LH2 target with an NH3 target

Distributions for NH3

NH3 Momentum Distribution in the Lab Frame

NH3 Angular Distribution in the Lab Frame

NH3 Momentum Distribution in the Center of Mass Frame

NH3 Angular Distribution in the Center of Mass Frame

LH2 Vs. NH3

Comparing Momentum Distribution in the Lab Frame

Comparing Angular Distribution in the Lab Frame

Comparing Momentum Distribution in the Center of Mass Frame

Comparing Angular Distribution in the Center of Mass Frame

Effects Due to Target Material

Target Density

Atomic Mass and Electron Number Effects

Differential Cross-Section Offset

Reconstruction of Moller Events

Creating LUND Files

Preparing LUND for Moller Distribution

Running GEMC

Analyzing Reconstruction Data

Reconstruction of Random Moller Events Within Certain Energy-Theta Range

Modified gcards

Effects of Solenoid on Moller Electrons

Moller Events in Solenoid Fields

Results for Random Spread of Energy and angle theta in the Lab frame

Cover Full Solid Angle of Detector

Calculations of 4-momentum components

Alter Phi Angles

Check Differential Cross-Section

PBS install

Running Expanded LUND files in GEMC


Back to Recon

Papers used

[1]Farrukh Azfar's Derivation of Moller Scattering

File:FarrukAzfarMollerScatter.pdf

A polarized target for the CLAS detector

File:PHY02-33.pdf

An investigation of the spin structure of the proton in deep inelastic scattering of polarized muons on polarized protons

File:1819.pdf

QED Radiative Corrections to Low-Energy Moller and Bhabha Scattering

http://arxiv.org/abs/1602.07609



EG12