HRS Analysis

PREX Main

Portal for HRS, Counting Mode, Optics, data and simulation notes and meetings

Useful Notes

• Weekly Meetings - Monday 2:30 PM
• Hall A monte carlo portal
• G4HRS Simulation - Documentation, Github
• HAMC Simulation - Notes, tech-note, formulae, Github
• Carbon contamination study: Note, Kiad's thesis

HRS Analyses

• Bob's October 2019 analysis plan, Kent's October 2019 plan, Ryan's October 2019 Update (most useful starting point), Ryan's FOM calculation for CREX notes
• Notes from Tyler: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Analyses Projects

• Optics Database Tuning - Ryan, Siyu, etc.
• Acceptance Function + APV Extraction - Ryan, Chandan, Bob, etc.
  • PREX I notes from Bob
  • Average Q^2 from Analyzer and Simulation - Devi, Ryan, Dustin
  • Inelastic backgrounds and contamination - Ryan, Devi, etc.
  • Radiative corrections for APV extraction - ?
  • Carbon contamination - Hanjie
• AT extraction, verification in Analyzer and Simulation - Ryan, Devi, etc.
• Rescattering, Pole Tip backgrounds, and more - Devi, Bob, etc.
• Reproduce phi distribution from HRS data with simulation

Outstanding Issues

• Super-elastic tail in G4HRS simulation but not in the Analyzer data
• Related, questionable quad magnetic field implementation in G4HRS (see some of Tyler's notes above for reference)
• Raster / BPM corrections for Analyzer Database
• Consider two ways of tuning HRS database w/ & w/o septum co-tune
• Are radiative corrections handled properly in G4HRS
• Target implementation is simplistic in G4HRS (and needs to be update to do diamond foil + Pb simultaneously)
• Inelastic states may need additional attention in G4HRS
• Difficult to recreate the hard collimator cut seen in the data with G4HRS

Carbon Contamination

Goal is to estimate relative cross-sections, acceptance with radiative effects, and then cross-check by comparing rates between the carbon target and lead targets

• Obtain counting mode data for lead and carbon targets to understand rates/thicknesses and provide a starting point
• Simulate the ideal carbon and lead targets and make sure we can predict accurately the rates and asymmetries that are measured
• Once those targets are ideally implemented in the simulation make a diamond+lead simulation for the front piece and the back piece (separately if needed, G4HRS generator will need code updates) to get radiation affects/contamination impacts on ideal lead
• Produce fractional rate and asymmetries per lead target

Target Density Fluctuations

Lead targets had density fluctuations and other changes over time that need to be understood in more time-resolved detail and studied carefully.