Difference between revisions of "Wednesday October 2, 2013"
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Some of the systematic errors are clearly relative like radiator thickness or chamber thickness errors. For others, we have to | Some of the systematic errors are clearly relative like radiator thickness or chamber thickness errors. For others, we have to | ||
make sure that they are relative. For example, when we do the energy scan, we need to change the beam energy by exactly 0.1 MeV | make sure that they are relative. For example, when we do the energy scan, we need to change the beam energy by exactly 0.1 MeV | ||
| − | without changing or introducing any new factor that would affect the beam energy systematic error. | + | without changing or introducing any new factor that would affect the beam energy systematic error. Also we do not want to change |
| + | the beam position or size on the radiator when changing beam energy. | ||
* Next meeting will be on October 23, 2013. | * Next meeting will be on October 23, 2013. | ||
Revision as of 11:23, 4 October 2013
We will meet in TED 2561B on Wednesday October 2 at 3:00 pm EST.
For those calling in we'll use the ReadyTalk audio conference system.
1. Dial Toll-Free Number: 866-740-1260 (U.S. & Canada) 2. Enter 7-digit access code 4402297, followed by “#”
Agenda:
1- Bubble Chamber progress at Argonne
2- Computer Center support: mailing list, group disk, wiki page, ...
3- Cost:
- Indirect General and Administrative (G&A) cost: 55.65% for both labor and procurement (Material and Shop) - Indirect Statutory and Fringe for labor: 57.15% - Final Bubble Chamber cost media:Bubble_FinalCost.pdf media:Bubble_FinalCost.pptx
4- Error Analysis:
- Analytical: Statistical, Absolute and Relative Systematic Errors media:Bubble_ErrAna.pdf media:Bubble_ErrAna.pptx - Monte Carlo Technique: Statistical, Absolute and Relative Systematic Errors media:Bubble_ErrAnaMC.pdf media:Bubble_ErrAnaMC.pptx
Notes from this meeting:
- Bubble Chamber:
- Buffer liquid mercury volume is now about 150 ml. - The State of Virginia reporting limit for mercury brought from out-of-state is 5.0 lbs. This is about 2268 grams or 168 ml. - Distance from the Bremsstrahlung radiator to the center of the bubble chamber must be about 50 cm. The Bremsstrahlung photon beam has a large opening angle at this low electron beam energy and thus the photon flux drops very quickly with distance. - JLab will high pressure test a fixture that will be used to hold mercury to 100 atms.
- Will submit a request to JLab Computer Center for a new email list and group. Our name will be "bubble".
- Cost:
- The grand overloaded total cost is about $350k. - Is it possible for our procurement cost to be considered "Capital Equipment"?
- Error Analysis:
- It is very important to have the systematic errors being relative, i.e., these errors do not change from one energy to another. Some of the systematic errors are clearly relative like radiator thickness or chamber thickness errors. For others, we have to make sure that they are relative. For example, when we do the energy scan, we need to change the beam energy by exactly 0.1 MeV without changing or introducing any new factor that would affect the beam energy systematic error. Also we do not want to change the beam position or size on the radiator when changing beam energy.
- Next meeting will be on October 23, 2013.