Bubble Chamber Beam Test May 2018

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Beam Setup and Measurement - May 2018

Bubble Chamber Turn On

  • Fill with natural C3F8 – test bubble chamber systems operation


  • With beam on bubble chamber radiator:
  1. How does CCD camera perform under beam-on conditions?
  2. Count rates on bubble chamber. Do we get single or multiple bubbles from Bremsstrahlung beam exposure?
  3. Measure gamma ray beam spatial profile as reflected by bubble distribution. Is collimator effective in defining the gamma-ray beam?
  4. Test the bubble chamber laser shutter (gumby shutter)


  • Background measurements:
  1. Measure beam off environmental background in chamber-injector area
  2. Measure beam on background by looking outside fiducial volume
  3. Measure background with beam to Faraday Cup in CEBAF beamline (about two meters from chamber)
  4. Measure neutron events in chamber. Neutron radiation detectors in injector region will indicate if any neutrons are generated



Bubble Chamber Beam Test

  • Bubble Chamber Run Plan
Draft Run Plan: media:bubble_runplan.pdf
Systematics:media:bubble_systematics_May2018.pdf
(Joe) Dispersive and Non-Dispersive Optics for last week's beam study data


Run Plan:

  • Prebeam Checkout:
  1. Neutron source test at 0.7, 1, 2, 5m
  2. Establish background rate with no beam


  • Check if Bubble Chamber is working properly:
  1. Establish high rate checkout beam: 5.74 MeV/c, 1uA (1 event per 5s)
  2. Determine the initial operational pressure and temperature
  3. Establish fiducial region for beam
  4. Measure activity with beam in high pressure
  5. Move beam +/-3 mm and search for 10% lower rate
  6. Change spot size to 2, 3mm; observe 30% lower rate at 3mm
  7. Current scan: 0.5 uA for 1 hour, 0.25 uA for 2 hours
    1. Normalized yields should be identical


  • Run high energy to low energy:
Beam Momentum (MeV/c) Beam Kinetic Energy (MeV) Beam Current (µA) Time (hour)
5.24 4.75 50 31
5.34 4.85 50 40
5.44 4.95 20 13
5.54 5.05 10 6
5.64 5.15 4 3
5.74 5.25 1 3

Nominal Daily Plan

Thurday, May 10
Swing p = 5.74 MeV/c, T = 5.25 MeV
Establish beam in the injector
Friday, May 11
Owl p = 5.74 MeV/c, T = 5.25 MeV
Start commissioning plan
Day No beam
Swing p = 5.74 MeV/c, T = 5.25 MeV
Continue commissioning plan
Data for T = 5.25 MeV point
Saturday, May 12
p = 5.74 MeV/c, T = 5.25 MeV
p = 5.64 MeV/c, T = 5.15 MeV
3+ hours for this point
Swing
Set up for p = 5.24 MeV/c, T = 4.75 MeV when previous point done
5.24 will be used to test if rates can be determined
Sunday, May 13
Owl: p = 5.24 MeV/c, T = 4.75 MeV
Day: p = 5.54 MeV/c, T = 5.05 MeV
Call Mom
6 hours data
Swing: p = 5.44 MeV/c, T = 4.95 MeV
16 hours data
Monday, May 14
Owl: p = 5.44 MeV/c, T = 4.95 MeV
Day: p = 5.44 MeV/c, T = 4.95 MeV
Swing: p = 5.34 MeV/c, T = 4.85 MeV
48+ hours
Tuesday, May 15
Owl: p = 5.34 MeV/c, T = 4.85 MeV
Day: p = 5.34 MeV/c, T = 4.85 MeV
Swing: p = 5.34 MeV/c, T = 4.85 MeV
Wednesday, May 16
Owl: p = 5.34 MeV/c, T = 4.85 MeV
Day: p = 5.24 MeV/c, T = 4.75 MeV
24+ hours
Swing: p = 5.24 MeV/c, T = 4.75 MeV
Thursday, May 17
Owl: p = 5.24 MeV/c, T = 4.75 MeV
Day: p = 5.24 MeV/c, T = 4.75 MeV
Swing: p = 5.24 MeV/c, T = 4.75 MeV
Friday, May 18
Owl: p = 5.24 MeV/c, T = 4.75 MeV
Day: ~fin~

Presentations

  • MCC 8 am presentation