Difference between revisions of "He3 / H3 e,e'p experiment E12-14-011"
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==Contact Info== | ==Contact Info== |
Revision as of 14:46, 30 May 2018
The SRC Tritium Experiment (E12-14-011) is an (e,e'p) experiment in Hall A, comparing the momentum distribution of protons in tritium and helium-3. These nuclei have a large proton-neutron asymmetry, but are also isospin-mirror nuclei, meaning that the proton distribution in tritium can tell us about the neutron distribution in helium-3.
Contents
- 1 During the experiment
- 2 Contact Info
- 3 Important Links
- 4 Other information
- 5 Shift Instructions
- 6 JLab Training
- 7 Documentation
- 8 Target Information
- 9 HRS Surveys and Mispointings
- 10 Reference Reading
- 11 Weekly SRC Meetings (Wednesdays 9:30 ET)
- 12 Bi-weekly SRC Analysis Meetings (Every Other Tuesdays 10:00 ET)
During the experiment
The information that was more relevant for activities during the data-taking period will be moved from this page to the following new page:
Contact Info
Expert | Phone |
---|---|
Run Coordinator (RC) | 757-876-1787 |
Machine Control Center (MCC) | 7046 |
Name | Work | Cell | |
---|---|---|---|
J.P.Chen | 7413 | (757) 218-0722 | jpchen@jlab.org |
Greg Smith | 5405 | (757) 871-4371 | smithg@jlab.org |
Silviu Covrig | 6410 | (843) 697-1753 | covrig@jlab.org |
Dave Meekins | 5434 | (757) 968-9076 | meekins@jlab.org |
Chris Keith | 5878 | (757) 746-9277 | ckeith@jlab.org |
Important Links
- Hall-A website
- Hall-A Elog
- Shift Sign-Up
- Shift Schedule (Read only)
- Run Coordinator Page
- CEBAF Status
- HRS info
Other information
- Kinematics MORE DETAILS HERE
- Ebeam (nominal) = 4300 MeV
- Ebeam (epics) = 4318.49 MeV
Kinematics | LHRS momentum [GeV] | LHRS angle [deg] | RHRS momentum [GeV] | RHRS angle [deg] |
---|---|---|---|---|
Fast | 3.543 | 20.88 | 1.4805 | 48.80 |
Slow | 3.543 | 20.88 | 1.246 | 58.50 |
Parallel (Hydrogen) | 3.543 | 17.80 | 1.4805 | 48.80 |
- BCM calibration
- run number: 100172
- target: carbon foil
- currents and attenuator values:
- 3uA ---> 140
- 7uA ---> 163
- 12uA ---> 184
- 18uA ---> 204
- 22.2uA ---> 214
- These are nominal values for the beam current. Gotta get the actual values from epics info.
- See example in the halog, entry number: 3505501
- Unser calibration
- run number: 100451
- target: dummy
- current values: 0,2,0,3,0,5,0,10,0,25,0,40,0,60,0,80,0,90,0,100,0,2,0,3,0,5,0,10,0 uA
- Ideally we would have completed two full cycles from 0 to 100 uA, but the beam came back and we decided to go back to production.
- See example in the halog, entry number: 3499263
Shift Instructions
- Overview
- More detailed instructions
Instructions for important tasks
- Running with the carbon-Hole target
- Running with the optics target
- Running with the dummy target
- Running with the tritium target
- Running with the helium-3 target
JLab Training
- You need to have a JLab account and be an active user.
- All trainings are available HERE.
- You can check the current status of your trainings HERE.
Regular Trainings:
The trainings that we need are:
- SAF110T - Tritium Training
- SAF116kd - Physics Division Work Governance
- SAF103 - ODH Training (Short quiz at the end)
- SAF100 - EH&S Orientation
- SAF801 - Radiation Worker Training
- If you do it for the first time you need to do a quiz at a JLab computer and a practical test. Afterwards you get your personal dosimeter
- If you renew your Radiation Worker training you only need to do the quiz.
- SAF110 - After you did all of the above you need the Hall A walkthrough.
- Read and sign the COO/ESAD/RSAD/ERG in the counting room. Electronic copies are HERE.
Tritium Target Operator Training
- Most detailed description of what to do can be found HERE.
- cryotarget training (lets you operate the standard Hall-A/C targets)
- Contact Greg, JP, and Silviu (see table above) to schedule time to receive a lecture. Lecture slides HERE.
- Lecture training followed by a practical training with one of them.
- Take half a shift with a trained Target Operator.
- Once the steps above are completed, send an email to Meekins, Greg, JP, and Silviu letting them know
- Tritium Target Operator Training
- Note that this is different from the SAF110T - Tritium Training mentioned above
- Training consists of going through the slides HERE.
- Send an email to Meekins letting him know that you completed the training
Documentation
- Run List
- For collimator cut
- Experiment seminar slides
- Run and online analysis slides
- Raster
- HRS DAQ Resources
- Simulation
- Tel Aviv University SRC group
- [back to Hall A wiki]
Target Information
HRS Surveys and Mispointings
- Spectrometer Surveys
LVDT retults
Kinematics | Run number | L mispointing [mm] | R mispointing [mm] | LHRS angle [deg] | RHRS angle [deg] |
---|---|---|---|---|---|
Fast | 100085 | 1.18245 | -0.70915 | 20.8837 | 48.8207 |
Hydrogen | 100100 | 0.9882 | -0.7113 | 17.8017 | 48.8207 |
Slow | 100532 | 0.48765 | -0.65395 | 20.8812 | 58.5031 |
Fast2 | 100658 | 0.49145 | -2.9875 | 20.8812 | 48.8187 |
Hydrogen2 | 100685 | 0.8831 | -3.00255 | 17.8053 | 48.8188 |
Reference Reading
- Proposal for E12-14-011, approved by PAC-42
- Hall-A NIM paper (2004)
- Tech notes on HRS optics calibration
- Hall A Coordinate systems (Ye Zhihong PhD thesis)