Difference between revisions of "He3 / H3 e,e'p experiment E12-14-011"
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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. | 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. | ||
+ | |||
+ | == Publications and results == | ||
+ | * '''Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements''' | ||
+ | ** R. Cruz-Torres, S. Li, F. Hauenstein, A. Schmidt, D. Nguyen, et al., (Jefferson Lab Tritium Collaboration) | ||
+ | ** [https://www.sciencedirect.com/science/article/pii/S0370269319306045 Phys. Lett. B '''797''', 134890 (2019)] | ||
+ | ** [https://arxiv.org/abs/1902.06358 arXiv:1902.06358 (2019)] | ||
+ | |||
+ | [[Image:Screen Shot 2019-02-22 at 2.23.35 PM.png|300px|center]] | ||
+ | |||
+ | * '''Probing few-body nuclear dynamics via 3H and 3He (e,e'p)pn cross-section measurements''' | ||
+ | ** R. Cruz-Torres, D. Nguyen, S. Li, F. Hauenstein, A. Schmidt, et al., (Jefferson Lab Tritium Collaboration) | ||
+ | ** [https://arxiv.org/abs/2001.07230 arXiv:2001.07230 (2020)] | ||
+ | |||
+ | [[Image:Screen Shot 2020-01-31 at 10.20.18 PM.png|600px|center]] | ||
+ | |||
+ | == Important codes == | ||
+ | |||
+ | * replay script can be found here: | ||
+ | **https://github.com/reynier0611/HallA-Online-Tritium/tree/coincidence | ||
+ | **(Make sure to be in the "coincidence" branch) | ||
+ | |||
+ | * bash scripts to submit jobs to the farm can be found here: | ||
+ | **https://github.com/reynier0611/tritium_batch_scripts | ||
+ | |||
+ | * skimmer and combiner codes can be found here: | ||
+ | **https://github.com/reynier0611/tritium_eep_skimmer | ||
+ | |||
+ | * skimmer keeps events based on the database: elist_database. | ||
+ | **This event list was created with the following code by Shujie: | ||
+ | **https://github.com/reynier0611/TritiumAnalysis/tree/master/beam | ||
== During the experiment == | == During the experiment == | ||
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* [[Data-taking period]] | * [[Data-taking period]] | ||
− | == | + | == Beam Energy Calibration == |
+ | [https://www.jlab.org/indico/event/197/session/3/contribution/12/material/slides/0.pdf Done by D. Higinbotham] ([[This is a 'pass-dependent' statement]]) | ||
+ | |||
+ | For second pass beam, use the Tiefenbach energy multiplied by 1.0025(5) | ||
+ | |||
+ | (That is, replace the value Ebeam in db_run.dat by 1.0025xEbeam) | ||
+ | |||
+ | After this correction, the measured Ebeam (before Eloss corrections) is '''~ 4.3255 GeV''' | ||
+ | |||
+ | [http://hallaweb.jlab.org/equipment/beam/energy/arc_web.html check this too] | ||
+ | |||
+ | == Raster Calibration == | ||
+ | |||
+ | [[More details here]] | ||
+ | |||
+ | == Target Information == | ||
+ | * [https://logbooks.jlab.org/files/2018/01/3514205/TGT-RPT-17-007.pdf Tritium Target Tech. Note] | ||
+ | * [https://logbooks.jlab.org/files/2018/01/3510390/DT_A1845.pdf Target Ladder Alignment Survey January 2018] | ||
+ | * [https://hallaweb.jlab.org/wiki/images/0/06/H3_target_info_summary.pdf Information from Jesse] | ||
+ | * [https://logbooks.jlab.org/files/2017/12/3501699/TGT-CALC-17-020.pdf Target Densities (TGT-CALC-17-020)] | ||
+ | * [https://logbooks.jlab.org/files/2018/11/3619916/TGT-CALC-17-020.pdf Target Densities (TGT-CALC-17-020) <- NEW ONE] | ||
+ | * [https://hallaweb.jlab.org/wiki/images/7/7b/Tritium_decay.pdf Helium contamination in tritium target - by Tyler Kutz] | ||
+ | |||
+ | {| style="border: 1px solid black;" | ||
+ | |- | ||
+ | !Target | ||
+ | !density [mg/cm2] | ||
+ | |- | ||
+ | !Hydrogen | ||
+ | !70.8 +/- 0.4 | ||
+ | |- | ||
+ | !Deuterium | ||
+ | !142.15 +/- 0.8 | ||
+ | |- | ||
+ | !Tritium | ||
+ | !85.1 +/- 0.8 | ||
+ | |- | ||
+ | !Helium-3 | ||
+ | !53.4 +/- 0.6 | ||
+ | |- | ||
+ | |} | ||
+ | |||
+ | == Kinematics == | ||
− | + | [https://hallaweb.jlab.org/wiki/images/8/87/Main_kinematics.pdf MORE DETAILS HERE] | |
These are the nominal values we got by optimizing in simc (these are not the actual values from the experiment) | These are the nominal values we got by optimizing in simc (these are not the actual values from the experiment) | ||
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|} | |} | ||
− | + | == HRS Angles, Surveys, and Mispointings == | |
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* Spectrometer Surveys | * Spectrometer Surveys | ||
** [https://hallaweb.jlab.org/wiki/images/3/34/L-HRS_Tritium%284-17-2018%29.pdf LHRS Survey, April 17 (during slow and fast2 kinematics)] | ** [https://hallaweb.jlab.org/wiki/images/3/34/L-HRS_Tritium%284-17-2018%29.pdf LHRS Survey, April 17 (during slow and fast2 kinematics)] | ||
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|} | |} | ||
+ | |||
+ | == Optics == | ||
+ | [http://web.mit.edu/reynier/www/Tritium_optics_matrices/LHRS_current_optics.html current LHRS matrix] | ||
+ | |||
+ | [http://web.mit.edu/reynier/www/Tritium_optics_matrices/RHRS_current_optics.html current RHRS matrix] | ||
+ | |||
+ | [[More information can be found here]] | ||
+ | |||
+ | == Other information == | ||
+ | |||
+ | * '''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 | ||
== Root files on Tape == | == Root files on Tape == | ||
− | July 10th, 2018 [[/mss/halla/triton/prod/coinc_eep/pass2.1/all/]] | + | Actual raw data: /mss/halla/triton/raw/ |
+ | |||
+ | July 10th, 2018: [[/mss/halla/triton/prod/coinc_eep/pass2.1/all/]] | ||
+ | |||
+ | July 27th, 2018: [[/mss/halla/triton/prod/coinc_eep/pass2.2/all/]] | ||
+ | |||
+ | August 10th, 2018: [[/mss/halla/triton/prod/coinc_eep/pass2.3/all/]] | ||
== Documentation == | == Documentation == | ||
* [https://docs.google.com/spreadsheets/d/1Kt_5uLLEZvaStKJK1RfV_C5BNUpuJaaEfpH8UXgCA3k/edit#gid=0 Run List] | * [https://docs.google.com/spreadsheets/d/1Kt_5uLLEZvaStKJK1RfV_C5BNUpuJaaEfpH8UXgCA3k/edit#gid=0 Run List] | ||
− | * [http://hallaweb.jlab.org/12GeV/experiment/E12-07-108/Publications/Technical/Spectrometer/Fall16/Right&Left_HRS_GMP_Fa16.pdf For collimator cut] | + | * [http://hallaweb.jlab.org/12GeV/experiment/E12-07-108/Publications/Technical/Spectrometer/Fall16/Right&Left_HRS_GMP_Fa16.pdf For collimator cut] (this cut ended up not being used) |
* [https://hallaweb.jlab.org/wiki/images/d/df/18_04_04_Tritium_%28e%2Ce%27p%29_v3.pdf Experiment seminar slides] | * [https://hallaweb.jlab.org/wiki/images/d/df/18_04_04_Tritium_%28e%2Ce%27p%29_v3.pdf Experiment seminar slides] | ||
* [https://hallaweb.jlab.org/wiki/images/b/bb/18_04_06_Run_Plan.pdf Run and online analysis slides] | * [https://hallaweb.jlab.org/wiki/images/b/bb/18_04_06_Run_Plan.pdf Run and online analysis slides] | ||
+ | * [https://arxiv.org/pdf/1811.12167.pdf Boiling paper] | ||
* [[Raster]] | * [[Raster]] | ||
* [[HRS DAQ Resources]] | * [[HRS DAQ Resources]] | ||
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* [https://hallaweb.jlab.org/experiment/Tritium/E12-11-112/tritium_page/runlist.php?exp=EPrunlist&runtype=All&hrs=all&target=All&keyword=&submit=search MySQL Database] | * [https://hallaweb.jlab.org/experiment/Tritium/E12-11-112/tritium_page/runlist.php?exp=EPrunlist&runtype=All&hrs=all&target=All&keyword=&submit=search MySQL Database] | ||
− | == Reference Reading == | + | === Reference Reading === |
* [https://hallaweb.jlab.org/wiki/images/2/26/PR12-13-012.pdf Proposal ] for E12-14-011, approved by PAC-42 | * [https://hallaweb.jlab.org/wiki/images/2/26/PR12-13-012.pdf Proposal ] for E12-14-011, approved by PAC-42 | ||
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* [http://hallaweb.jlab.org/experiment/E07-006/ Hall-A E07-006 4He(e,e'p) experiment] | * [http://hallaweb.jlab.org/experiment/E07-006/ Hall-A E07-006 4He(e,e'p) experiment] | ||
− | == | + | == Meetings == |
− | + | === Bi-weekly Tritium SRC Analysis Meetings (Every Other Tuesdays 10:00 ET)=== | |
− | + | ||
− | == Bi-weekly SRC Analysis Meetings (Every Other Tuesdays 10:00 ET) == | + | |
* [[SRC Analysis Meetings]] | * [[SRC Analysis Meetings]] | ||
+ | |||
+ | === Weekly SRC Meetings (Wednesdays 9:30 ET) === | ||
+ | |||
+ | * [[Files (SRC Meetings)]] |
Latest revision as of 23:20, 31 January 2020
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
Publications and results
- Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements
- R. Cruz-Torres, S. Li, F. Hauenstein, A. Schmidt, D. Nguyen, et al., (Jefferson Lab Tritium Collaboration)
- Phys. Lett. B 797, 134890 (2019)
- arXiv:1902.06358 (2019)
- Probing few-body nuclear dynamics via 3H and 3He (e,e'p)pn cross-section measurements
- R. Cruz-Torres, D. Nguyen, S. Li, F. Hauenstein, A. Schmidt, et al., (Jefferson Lab Tritium Collaboration)
- arXiv:2001.07230 (2020)
Important codes
- replay script can be found here:
- https://github.com/reynier0611/HallA-Online-Tritium/tree/coincidence
- (Make sure to be in the "coincidence" branch)
- bash scripts to submit jobs to the farm can be found here:
- skimmer and combiner codes can be found here:
- skimmer keeps events based on the database: elist_database.
- This event list was created with the following code by Shujie:
- https://github.com/reynier0611/TritiumAnalysis/tree/master/beam
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:
Beam Energy Calibration
Done by D. Higinbotham (This is a 'pass-dependent' statement)
For second pass beam, use the Tiefenbach energy multiplied by 1.0025(5)
(That is, replace the value Ebeam in db_run.dat by 1.0025xEbeam)
After this correction, the measured Ebeam (before Eloss corrections) is ~ 4.3255 GeV
Raster Calibration
Target Information
- Tritium Target Tech. Note
- Target Ladder Alignment Survey January 2018
- Information from Jesse
- Target Densities (TGT-CALC-17-020)
- Target Densities (TGT-CALC-17-020) <- NEW ONE
- Helium contamination in tritium target - by Tyler Kutz
Target | density [mg/cm2] |
---|---|
Hydrogen | 70.8 +/- 0.4 |
Deuterium | 142.15 +/- 0.8 |
Tritium | 85.1 +/- 0.8 |
Helium-3 | 53.4 +/- 0.6 |
Kinematics
These are the nominal values we got by optimizing in simc (these are not the actual values from the experiment)
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 |
HRS Angles, 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 |
HRS Momenta
Values taken from db_run.dat file.
Kinematics | Run number | LHRS p_cent [GeV] | RHRS p_cent [GeV] |
---|---|---|---|
Fast | 100085 | 3.54334 | 1.48051 |
Hydrogen | 100102 | 3.54334 | 1.4805 |
Slow | 100532 | 3.54331 | 1.246 |
Fast2 | 100658 | 3.5433 | 1.48051 |
Hydrogen2 | 100685 | 3.5433 | 1.4805 |
Optics
More information can be found here
Other information
- 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
Root files on Tape
Actual raw data: /mss/halla/triton/raw/
July 10th, 2018: /mss/halla/triton/prod/coinc_eep/pass2.1/all/
July 27th, 2018: /mss/halla/triton/prod/coinc_eep/pass2.2/all/
August 10th, 2018: /mss/halla/triton/prod/coinc_eep/pass2.3/all/
Documentation
- Run List
- For collimator cut (this cut ended up not being used)
- Experiment seminar slides
- Run and online analysis slides
- Boiling paper
- Raster
- HRS DAQ Resources
- Simulation
- Tel Aviv University SRC group
- MySQL Database
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)
- HRS info