Bubble Chamber Meeting Wednesday June 3, 2015
We will meet in TL 2221 on Wednesday June 3 at 3:30 pm EST.
For those calling in we'll use the Blue Jeans  audio conference system.
Phone number: 1-888-240-2560 Meeting ID: 3528502673# Meeting URL: http://bluejeans.com/3528502673
1- Bubble Chamber progress at Argonne
2- Detection features of new bubble chamber: media:Detection_features_new_bubble_chamber.pdf
Notes from this meeting:
- Bubble Chamber:
- Showed bubbles distribution from N2O with mercury as buffer liquid using PuC neutron source.
- Plan to measure temperature gradient across the glass cell.
- Test chamber with C2F6 as the super heated liquid.
- Chamber stand (support structure) for JLab injector beamline.
- What type of window on chamber high pressure vessel that is used for the camera?
- Supper Heated Liquid:
- Regarding CO2: it is possible to suppress the 12C(γ,α)2α signal but 13C(γ,n)12C background is still significant - Not an option.
- For N2O: 15N can be enriched from 0.366% to 98% to help suppress 14N(γ,p)13C background. However, a factor of 50 suppression of 14N is still tiny when compared to 108 needed; have to rely on chamber efficiency vs temperature.
- Schedule: media:150604_INJ_SAD15.pdf
- Reconfigure bubble chamber beamline in the first two weeks of July.
- Chamber arrives JLab in middle of July, move to Injector, install and align.
- Mercury will be installed in chamber at Argonne.
- Brad arrives on August 3, 2015. Cool and pressurize with C2F6. Complete safety reviews.
- Beam on chamber in the second week of August. Beam kinetic energy = 4.0 – 5.5 MeV.
- Remove C2F6 and fill with N2O during the last two weeks of August.
- Beam on chamber in the first two weeks of September. Beam kinetic energy = 4.0 – 9.5 MeV.
- In June - August: find the highest gradients for the 1/4 cryounit. Do we need to ask for helium processing of the unit? it is not planned.