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

  • Owl: p = 5.74 MeV/c, T = 5.25 MeV
  • Day: 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