Bubble Chamber Beam Test May 2018
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Contents
Beam Setup and Measurement - May 2018
Bubble Chamber Turn On
- Fill with natural C_{3}F_{8} – test bubble chamber systems operation
- With beam on bubble chamber radiator:
- How does CCD camera perform under beam-on conditions?
- Count rates on bubble chamber. Do we get single or multiple bubbles from Bremsstrahlung beam exposure?
- Measure gamma ray beam spatial profile as reflected by bubble distribution. Is collimator effective in defining the gamma-ray beam?
- Test the bubble chamber laser shutter (gumby shutter)
- Background measurements:
- Measure beam off environmental background in chamber-injector area
- Measure beam on background by looking outside fiducial volume
- Measure background with beam to Faraday Cup in CEBAF beamline (about two meters from chamber)
- 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:
- Neutron source test at 0.7, 1, 2, 5m
- Establish background rate with no beam
- Check if Bubble Chamber is working properly:
- Establish high rate checkout beam: 5.74 MeV/c, 1uA (1 event per 5s)
- Determine the initial operational pressure and temperature
- Establish fiducial region for beam
- Measure activity with beam in high pressure
- Move beam +/-3 mm and search for 10% lower rate
- Change spot size to 2, 3mm; observe 30% lower rate at 3mm
- Current scan: 0.5 uA for 1 hour, 0.25 uA for 2 hours
- 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