Difference between revisions of "He3 / H3 e,e'p experiment E12-14-011"

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* Running with the helium-3 target
 
* Running with the helium-3 target
  
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== JLab Training ==
 
  
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* You need to have a JLab account and be an active user.
 
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* All trainings are available [https://www.jlab.org/div_dept/train/webbasedtraining.html HERE].
 
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* You can check the current status of your trainings [https://misportal.jlab.org/training/home.seam HERE].
 
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=== Regular Trainings: ===
 
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The trainings that we need are:
 
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* SAF110T - Tritium Training
 
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* SAF116kd - Physics Division Work Governance
 
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* SAF103 - ODH Training (Short quiz at the end)
 
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* SAF100 - EH&S Orientation
 
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* SAF801 - Radiation Worker Training
 
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** 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
 
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** If you renew your Radiation Worker training you only need to do the quiz.
 
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* SAF110 - After you did all of the above you need the Hall A walkthrough.
 
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* Read and sign the COO/ESAD/RSAD/ERG in the counting room. Electronic copies are [http://hallaweb.jlab.org/index/safety-docs/current/ HERE].
 
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=== Tritium Target Operator Training ===
 
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* Most detailed description of what to do can be found [https://wiki.jlab.org/jlab_tritium_target_wiki/index.php/Training HERE].
 
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* cryotarget training (lets you operate the standard Hall-A/C targets)
 
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** Contact Greg, JP, and Silviu (see table above) to schedule time to receive a lecture. Lecture slides [http://hallaweb.jlab.org/equipment/targets/cryotargets/TOtraining.pdf HERE].
 
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** Lecture training followed by a practical training with one of them.
 
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** Take half a shift with a trained Target Operator.
 
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** Once the steps above are completed, send an email to Meekins, Greg, JP, and Silviu letting them know
 
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* Tritium Target Operator Training
 
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** Note that this is different from the SAF110T - Tritium Training mentioned above
 
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** Training consists of going through the slides [https://wiki.jlab.org/jlab_tritium_target_wiki/images/e/e1/Hall_A_Tritium_Target_Operator_Training.pdf HERE].
 
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** Send an email to Meekins letting him know that you completed the training
 
  
 
== Documentation ==  
 
== Documentation ==  

Revision as of 14:50, 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.

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:

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


Documentation

Target Information

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)

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