Bubble Chamber Meeting Wednesday March 9, 2016

We will meet in TL 2221 on Wednesday March 9 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- New Test Run II Schedule:

1. Bubble Installation: May 5 – May 12, 2016
2. Bubble Run: June 13 – June 27, 2016

2- Test Run III: Aug 15 – Aug 29, 2016

3- Beam Analysis: energy and position – energy spread and beam size

• Beam Energy:

media:160309_MottEnergy_Grames.pdf media:160309_MottEnergy_Grames.pptx

media:JLab-TN-16-xx_v5.pdf media:JLab-TN-16-xx_v5.docx

4- Bubble Chamber work at ANL: media:Progress_March_2016_Bubble_Chamber.pdf

5- Measuring ¹⁹F(γ,α)¹⁵N in June 2016: media:Fluorine_June2016_Test_part2.pdf media:Fluorine_June2016_Test_part2.pptx

6- New beamline design with sweep magnet

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Notes from this meeting:

• Superheated fluid will be C₂F₆

• Beam Energy Tasks:

1. Analyse beam energies used during September 2015 Bubble Chamber Run I, similar to what Grames did for Mott run.
2. Measure stray field in 5D line (Bubble Chamber) since new steel was added between 5D00 and 5D01 BPMs and to extend measurement to radiator.
3. Use Hall Probe installed inside dipole to study systematic errors (especially magnet power supply) in beam energy measurement (0.01% accuracy, resolution to 2 ppm, and a temperature stability of 10 ppm/°C).

• Measure ¹⁹F(γ,α)¹⁵N around 5.4 MeV electron kinetic energy to map huge change in rate in this region. Develop a procedure to enable running below 1 nA beam currents.

• Temporary Operational Safety Procedure (TOSP) expired on December 8, 2015. Needs new approval with updates on modifications: no mercury, new collimator, new lead camera shielding.