Difference between revisions of "TL-Polarimetry"
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== Moller Polarimeter == | == Moller Polarimeter == | ||
| + | |||
| + | [https://hallaweb.jlab.org/wiki/index.php/Moller Moller Polarimeter Wiki] | ||
| + | |||
| + | [https://hallaweb.jlab.org/dvcslog/moller/page1 Moller Polarimeter ELog] | ||
| + | |||
=== 1 GeV Optics (Gaskell, Sangwha) === | === 1 GeV Optics (Gaskell, Sangwha) === | ||
# Scan around current solution using G4 simulation | # Scan around current solution using G4 simulation | ||
=== Simulation for acceptance evaluation=== | === Simulation for acceptance evaluation=== | ||
| + | * Generator: [https://prex.jlab.org/wiki/index.php/File:Hallc_moller_eventgen.pdf slides] presented 180329 by Dave G | ||
| + | ** elastic ee | ||
| + | ** Multiple scattering / Brem (external) | ||
| + | ** internal Brem? | ||
| + | ** Levchuk | ||
| + | *Include Solenoid field | ||
| + | * Benchmark to 5 GeV results | ||
| + | * Benchmark to G3 simulation results | ||
| + | * Test new optics for 1.05 GeV, 2.1 GeV | ||
| + | ** cut at collimator, verify no other intersections for ee elastic | ||
| + | *** use larger beampipe, verify slightly larger collimator passes everywhere? | ||
| + | *** map collimator to COM angles, widen slightly and show they reach the collimator? | ||
| + | ** Look at A_{ZZ} (and rates?) sensitivity to: | ||
| + | *** magnet mis-tune | ||
| + | *** magnet mis-alignment | ||
| + | *** solenoid field | ||
| + | *** beam position | ||
| + | *** beam angle | ||
| + | *** Levchuk | ||
| + | ** Predict singles and coincidence (ee) rates | ||
| + | *** including detector segmentation | ||
| + | * Magnetic Field | ||
| + | ** determine realistic fields with realistic iron configuration (interacting magnets?) | ||
| + | |||
=== Target system installation === | === Target system installation === | ||
=== Plan to establish high-precision Moller polarimetry (ERR recommendation) === | === Plan to establish high-precision Moller polarimetry (ERR recommendation) === | ||
| Line 20: | Line 49: | ||
=== DAQ (Franklin, Michaels) === | === DAQ (Franklin, Michaels) === | ||
| + | '''Main Compton photon detector DAQ''' | ||
# Recover DAQ signals (check that all cables from DVCS run are still there - or recover) and add further needed DAQ signals | # Recover DAQ signals (check that all cables from DVCS run are still there - or recover) and add further needed DAQ signals | ||
#* Check helicity signal noise | #* Check helicity signal noise | ||
| Line 28: | Line 58: | ||
# Investigate what happened to the flash ADC rework (was it sent to STRUCK?!) | # Investigate what happened to the flash ADC rework (was it sent to STRUCK?!) | ||
# Support PMT linearity studies (if done @JLab) | # Support PMT linearity studies (if done @JLab) | ||
| + | |||
| + | ''Scalar DAQ'' | ||
=== Plan to establish high-precision Compton polarimetry (ERR recommendation)=== | === Plan to establish high-precision Compton polarimetry (ERR recommendation)=== | ||
=== e- detector === | === e- detector === | ||
Latest revision as of 10:55, 30 April 2018
Contact: Kent Paschke
Manpower: Kent Paschke, Dave Gaskell, Sanghwa Park, Don Jones
Moller Polarimeter
1 GeV Optics (Gaskell, Sangwha)
- Scan around current solution using G4 simulation
Simulation for acceptance evaluation
- Generator: slides presented 180329 by Dave G
- elastic ee
- Multiple scattering / Brem (external)
- internal Brem?
- Levchuk
- Include Solenoid field
- Benchmark to 5 GeV results
- Benchmark to G3 simulation results
- Test new optics for 1.05 GeV, 2.1 GeV
- cut at collimator, verify no other intersections for ee elastic
- use larger beampipe, verify slightly larger collimator passes everywhere?
- map collimator to COM angles, widen slightly and show they reach the collimator?
- Look at A_{ZZ} (and rates?) sensitivity to:
- magnet mis-tune
- magnet mis-alignment
- solenoid field
- beam position
- beam angle
- Levchuk
- Predict singles and coincidence (ee) rates
- including detector segmentation
- cut at collimator, verify no other intersections for ee elastic
- Magnetic Field
- determine realistic fields with realistic iron configuration (interacting magnets?)
Target system installation
Plan to establish high-precision Moller polarimetry (ERR recommendation)
Compton Polarimeter
Laser Maintenance and improvement (Dave, Cip, Amali) summer 2018
Photon Detector (Juan-Carlos)
DAQ (Franklin, Michaels)
Main Compton photon detector DAQ
- Recover DAQ signals (check that all cables from DVCS run are still there - or recover) and add further needed DAQ signals
- Check helicity signal noise
- Recover Analyzer and back up on github.
- Automate analysis
- Create online analyzer
- Automate analysis
- Learn Compton simulation and produce meaningful results
- Investigate what happened to the flash ADC rework (was it sent to STRUCK?!)
- Support PMT linearity studies (if done @JLab)
Scalar DAQ
