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.
Support crew travel schedule
Spreadsheet
Run Coordinator Schedule
| From
|
To
|
RC
|
| April 12
|
April 19
|
Florian Hauenstein
|
| April 20
|
April 22
|
Eric Fuchey
|
| April 23
|
April 30
|
Barak Schmookler
|
| May 1
|
end of run
|
Axel Schmidt
|
Contact Info
| Expert
|
Phone
|
| Run Coordinator (RC)
|
757-876-1787
|
| Machine Control Center (MCC)
|
7046
|
Target Experts
| Name
|
Work
|
Cell
|
Email
|
| 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
Other information
| 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
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
HRS Surveys and Mispointings
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
Previous (e,e'p) studies
Weekly SRC Meetings (Wednesdays 9:30 ET)
Bi-weekly SRC Analysis Meetings (Every Other Tuesdays 10:00 ET)
