Bubble Chamber Beam Test 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
- Check if Bubble Chamber is working properly:
- Start with K.E. of 5.25 MeV
- Determine the initial operational pressure and temperature
- Measure bubble rate. The expected rate is 1 bubble per sec at 10 µA
- Measure rate vs beam current (0.01, 0.1 and 1.0 µA)
- Measure the number of bubbles for 30 minutes per beam current
|Beam Momentum (MeV/c)||Beam Kinetic Energy (MeV)||Beam Current (µA)||Time (hour)|
- MCC 8 am presentation