Difference between revisions of "Bubble Chamber Meeting Wednesday June 3, 2015"
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# Showed bubbles distribution from N<sub>2</sub>O with mercury as buffer liquid using PuC neutron source. | # Showed bubbles distribution from N<sub>2</sub>O with mercury as buffer liquid using PuC neutron source. | ||
# Plan to measure temperature gradient across the glass cell. | # Plan to measure temperature gradient across the glass cell. | ||
− | |||
# Test chamber with C<sub>2</sub>F<sub>6</sub> as the super heated liquid. | # Test chamber with C<sub>2</sub>F<sub>6</sub> 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? | ||
− | * Schedule: | + | * Supper Heated Liquid: |
+ | # Regarding CO<sub>2</sub>: it is possible to suppress the <sup>12</sup>C(γ,α)2α signal but <sup>13</sup>C(γ,n)<sup>12</sup>C background is still significant - Not an option. | ||
+ | # For N<sub>2</sub>O: <sup>15</sup>N can be enriched from 0.366% to 98% to help suppress <sup>14</sup>N(γ,p)<sup>13</sup>C background. However, a factor of 50 suppression of <sup>14</sup>N is still tiny when compared to 10<sup>8</sup> 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. | # Reconfigure bubble chamber beamline in the first two weeks of July. | ||
− | # Chamber arrives JLab in middle of July | + | # Chamber arrives JLab in middle of July, move to Injector, install and align. |
− | # Mercury | + | # Mercury will be installed in chamber at Argonne. |
− | # Brad arrives on August 3. Cool and pressurize with C<sub>2</sub>F<sub>6</sub>. Complete safety reviews. | + | # Brad arrives on August 3, 2015. Cool and pressurize with C<sub>2</sub>F<sub>6</sub>. Complete safety reviews. |
− | # Beam on chamber in the second week of August | + | # Beam on chamber in the second week of August. Beam kinetic energy = 4.0 – 5.5 MeV. |
− | # Remove C<sub>2</sub>F<sub>6</sub> and fill with N<sub>2</sub>O during the last two | + | # Remove C<sub>2</sub>F<sub>6</sub> and fill with N<sub>2</sub>O during the last two weeks of August. |
− | # Beam on chamber in the first two weeks of September | + | # 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. |
Latest revision as of 18:17, 4 June 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
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.