HRS Analysis

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

Useful Notes

HRS Analyses

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.