SeaQuest Polarized Target

Overview

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

The polarized target system consists of 6 major subsystems:

1. The cryogenic Evaporation Fridge is designed to provide high cooling power (1 W) at 1 K.
2. The Pump Stack is two 7000 m³/hour in parallel backed by a 7000 m³/hour backed by a 755 m³/hour rotary vane.
3. The NMR (Nuclear Magnetic Resonance) system is needed to measure the polarization of the sample.
   
4. The CPI EIO (Extended Interaction Oscillator) is a microwave generator used in DNP.
5. The Target Material is a frozen solid material with the necessary characteristics for nucleon polarization.
6. The Oxford Superconducting Magnet is vertically pointing split pair magnet needed for DNP.
   
   
   

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.