Difference between revisions of "Bubble Chamber Beam Test May 2018"
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| Line 39: | Line 39: | ||
<span style="font-size:150%"> '''Run Plan:''' </span> | <span style="font-size:150%"> '''Run Plan:''' </span> | ||
| + | |||
| + | * ''Prebeam Checkout:'' | ||
| + | # Neutron source test at 0.7, 1, 2, 5m | ||
| + | # Establish background rate with no beam | ||
* ''Check if Bubble Chamber is working properly:'' | * ''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 | # Determine the initial operational pressure and temperature | ||
| − | # Measure | + | # 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 | ||
| Line 77: | Line 84: | ||
| 6 | | 6 | ||
|- | |- | ||
| + | | 5.64 | ||
| 5.15 | | 5.15 | ||
| 4 | | 4 | ||
| 3 | | 3 | ||
|- | |- | ||
| − | | 5. | + | | 5.74 |
| 5.25 | | 5.25 | ||
| 1 | | 1 | ||
Revision as of 10:36, 10 May 2018
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:
- 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
| 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 |
- Presentations
- MCC 8 am presentation