Overview

What do you need to know about the polarized target system?

The polarized target system consists of 5 major subsystems:
  1. The cryogenic Evaporation Fridge is designed to provide high cooling power at 1 K.
  2. The CPI EIO (Extended Interaction Oscillator) is a microwave generator used in DNP.
  3. The Oxford Superconducting Magnet is vertically pointing split pair magnet needed for DNP.
  4. The Target Material is a frozen solid material with the necessary characteristics for nucleon polarization.
  5. The NMR (Nuclear Magnetic Resonance) system is needed to measure the polarization of the sample.

What is special about the Drell-Yan Target

This system has the longest (along the beam-line) target cell to date for an evaporation fridge, this requires a unique microwave distributing horn and three NMR coils per target cell to further reduce systematics in the polarization measurement.  This system was configured with the intention of having the greatest instantaneous luminosity of any previous evaporation system by having a beam intensity of 3X1012 protons/sec for 5 seconds while using a large pump system (14,000 m3/hour).  We are also running an experiment with both polarized protons and neutrons which share different sensitivity to the overall figure of merit of the Drell-Yan asymmetry.

 

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h2. Target Details

h4. [Introduction to the Drell-Yan PT]

h4. [Polarized Target Expert]

h4. [Polarized Target Operator]

h4. [Target System Photos]

h4. [Target Logbook]

h2. Polarized Target Training

[Polarized Target Summary]
[Anneal Summary Table]
[Target Operators]
[Target Troubleshooting Procedures]

h2. Training Materials

Training for the Drell-Yan 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.

[Practical Primer on the UVa Target]
[Polarization Display Panel (PDP) Overview]
[Target Operator Duties]

h2. Operational Procedures

[PDP Restart Procedure]
[Cryo Screen Restart Procedure]
[Target Movement Procedure]
[New Baseline Procedure]
[Thermal Equilibrium Measurement Procedure]
[Prepare Frig for Polarization]
[Anneal Procedure] (Experts only)
[Running with No Helium for Optics] (Experts only)
[Target Replacement Procedure] (Experts only)
[Magnet Energization Procedure] (Experts only)

h2. General Target Documents

[https://hallaweb.jlab.org/wiki/images/f/f1/Logbook.pdf Target Logbook]
[http://www.jlab.org/~pzhu/report/Polarized_Proton_Target.pdf Introduction to the Target] by P. Zhu
[https://poltar.jlab.org/drupal/filebrowser/download/648 Design Criteria for Polarized Target Vacuum Dewar, Oxford Instruments, 1991]



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