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 [1] audio conference system.

Phone number: 1-888-240-2560
Meeting ID: 3528502673#
Meeting URL: http://bluejeans.com/3528502673

Agenda:

1- Bubble Chamber progress at Argonne

2- Detection features of new bubble chamber: media:Detection_features_new_bubble_chamber.pdf

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Notes from this meeting:

• Bubble Chamber:

1. Showed bubbles distribution from N₂O with mercury as buffer liquid using PuC neutron source.
2. Plan to measure temperature gradient across the glass cell.
3. Regarding CO₂: it is possible to suppress the ¹²C(γ,α)2α signal but ¹³C(γ,n)¹²C background will be significant - Not an option.
4. For N₂O: ¹⁵N can be enriched from 0.3% to 98% to help suppress ¹⁴N(γ,p)¹³C background.
5. Test chamber with C₂F₆ as the super heated liquid.

• Schedule:

1. Reconfigure bubble chamber beamline in the first two weeks of July.
2. Chamber arrives JLab in middle of July. Move to Injector. Install and align.
3. Mercury we be installed in chamber at Argonne.
4. Brad arrives on August 3, 2015. Cool and pressurize with C₂F₆. Complete safety reviews.
5. Beam on chamber in the second week of August filled with C₂F₆. Beam kinetic energy = 4.0 – 5.5 MeV.
6. Remove C₂F₆ and fill with N₂O during the last two week on August.
7. Beam on chamber in the first two weeks of September. Beam kinetic energy = 4.0 – 9.5 MeV.