Difference between revisions of "Solid Polarized Target"

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==Overview==
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This page has been moved to [https://solid.jlab.org/wiki/index.php/Polarized_Target https://solid.jlab.org/wiki/index.php/Polarized_Target] in the new [https://solid.jlab.org/wiki SoLID Wiki].  Please do not edit this page.
  
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Our Dynamically Nuclear Polarized Target can provide greater than 90% proton polarization in a irradiated ammonia target sample in a 5T magnetic field and at around 1K.  The basic operating principle involves leveraging the spin-spin coupling of a free electron in our material to the proton we wish to polarize.  In a magnetic field, the spin-spin coupling results in a hyper-fine splitting as see in the diagram to the right. 
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==Quick Links==
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[[Image:DNP-diag1.png|200px|thumb]]
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Using microwaves of wavelengths corresponding to the energy gaps, transitions can be induced to flip to the spin of the proton along with the spin of the electron.  As in the example of the dagram, the (down,down) state can be flipped to the (up,up) state, but by changing the microwave frequency it is also possible to flip the (down,up) state to the (up,down) state, thereby anti-aligning the proton without changing the magnetic field.  Since the relaxation time of the electron at 1K is on the order of milliseconds, whereas that of the proton is tens of minutes, the same electron can be used to polarize many protons. 
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*[[G2p Target Summary]]
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*[[Anneal Summary Table]]
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*[http://hallaweb.jlab.org/experiment/g2p/target/ Target eLog] - Operators, check this twice a shift to ensure screenshots are current!
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*[[Target Troubleshooting Procedures]]
  
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===DNP===
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==Training Materials==
  
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There are 5 basic ingredients which go into this target: a high magnetic field, a low temperature, a microwave system, an NMR system, and a suitable target material.  We will briefly walk through these 5 building blocks, and what systems are necessary to provide them in the experimental hall.
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Training for g2p target operators will consist of a brief online quiz on the topics covered here on the Wiki, followed by a practical course when the target is installed and running in the hall.  The primer is also available as a PDF: [[Image:G2p target primer.pdf]].
  
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[[Image:DNP-Overview.png|200px|thumb]]
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*[[Practical Primer on the UVa Target]]
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*[[Polarization Display Panel (PDP) Overview]]
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*[[Target Operator Duties]]
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*[https://userweb.jlab.org/~jmaxwell/g2p/g2p_target_training.pdf Target Training Slides]
  
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'''Take the quiz after you've read the above primer closely, and taken a look at the two others as well:'''
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*[[Online Target Operator Quiz]]
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**[[List of Certified Target Operators]]
  
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==Training Materials==
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==Operational Procedures==
  
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*[[PDP Restart Procedure]]
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*[[Cryo Screen Restart Procedure]]
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*[[Target Movement Procedure]]
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*[[New Baseline Procedure]]
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*[[Thermal Equilibrium Measurement Procedure]]
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*[[Prepare Frig for Polarization]]
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*[[Anneal Procedure]] (Experts only)
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*[[Running with No Helium for Optics]] (Experts only)
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*[[Target Replacement Procedure]] (Experts only)
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*[[Magnet Energization Procedure]] (Experts only)
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==g2p Target Documents==
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*[https://hallaweb.jlab.org/wiki/images/f/f1/Logbook.pdf Target Logbook]
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*[http://www.jlab.org/~pzhu/report/Polarized_Proton_Target.pdf Introduction to the Target] by P. Zhu
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*[https://hallaweb.jlab.org/dvcslog/g2p/10 Target cooled down]
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*[https://poltar.jlab.org/drupal/filebrowser/download/648 Design Criteria for Polarized Target Vacuum Dewar, Oxford Instruments, 1991]
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*[https://poltar.jlab.org/drupal/filebrowser/download/648 Relief Analysis of Hall C Polarized Target]
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*[https://poltar.jlab.org/drupal/filebrowser/download/650 Relief Analysis of Hall B Polarized Target]
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*[http://www.example.com Hall B Magnet Refit Calculations (under review)]
  
 
==Links==
 
==Links==
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* [http://twist.phys.virginia.edu/ UVa Target Group Homepage]
 
* [http://twist.phys.virginia.edu/ UVa Target Group Homepage]
 
* [https://hallcweb.jlab.org/experiments/sane/wiki/index.php/UVa_Polarized_Target Target Page on SANE Wiki]
 
* [https://hallcweb.jlab.org/experiments/sane/wiki/index.php/UVa_Polarized_Target Target Page on SANE Wiki]
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* [http://galileo.phys.virginia.edu/~dbd/PolarizedTargetPhotos.html Target Photos and Procedures from Donal's Webpage]
  
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===Pertinent Papers:===
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'''Pertinent Papers:'''
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* [http://www.sciencedirect.com/science/article/pii/S0168900298014314 A solid polarized target for high-luminosity experiments], ''T.O. Averrett et al.''
 
* [http://www.annualreviews.org/doi/abs/10.1146/annurev.nucl.47.1.67 SOLID POLARIZED TARGETS FOR NUCLEAR AND PARTICLE PHYSICS EXPERIMENTS], ''DG Crabb, W Meyer''
 
* [http://www.annualreviews.org/doi/abs/10.1146/annurev.nucl.47.1.67 SOLID POLARIZED TARGETS FOR NUCLEAR AND PARTICLE PHYSICS EXPERIMENTS], ''DG Crabb, W Meyer''
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* [https://hallaweb.jlab.org/dvcslog/g2p/110412_205212/PhysRevLett.64.2627.pdf Proton Polarization in Irradiated Ammonia] ''DG Crabb et al.''
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* [http://www.sciencedirect.com/science/article/pii/S0168900204005583 Observations of radiation damage and recovery in ammonia targets], ''P. McKee''
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* [http://eproceedings.worldscinet.com/9789814324922/9789814324922_0018.html RADIATION DAMAGE AND RECOVERY IN POLARIZED 14NH3 AMMONIA TARGETS AT JEFFERSON LAB], ''J. Maxwell''

Latest revision as of 15:39, 7 December 2020

This page has been moved to https://solid.jlab.org/wiki/index.php/Polarized_Target in the new SoLID Wiki. Please do not edit this page.

Quick Links

Training Materials

Training for g2p target operators will consist of a brief online quiz on the topics covered here on the Wiki, followed by a practical course when the target is installed and running in the hall. The primer is also available as a PDF: File:G2p target primer.pdf.

Take the quiz after you've read the above primer closely, and taken a look at the two others as well:

Operational Procedures

g2p Target Documents

Links

University of Virginia Target Group Links:

Pertinent Papers:

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