Hall B Polarized Target Test,  April 4-8 '05


Good News (Goal Accomplished)

  Assemble and test target cryostat (apparent superfluid leak)

  Test 1 K refrigerator (1.01 K w/o microwaves, 1.09 K w/ microwaves)

  Test target stick  Drive Mechanism (too slow, requires too much torque)

  Test new annealing "Oven" (uniform temperature @ 80K +/- 4K)

  Test microwaves (0.77 Watts into banjo)

  Map microwave distribution (looks ok)




Bad News (Goal Not Accomplished)

    Ramp magnet  (not enough LHe)

  Polarize NH3

   Test NMR

To Do List

  Fix vacuum leak

 Double-Check insert alignment and motion

  Check alignment of microwave horn

  Check target fiducials (Survey Group)

  Install helium gas purge at top of banjo to reduce ice build-up

 More cooling for mechanical pumps

 Modify annealing oven to avoid snagging insert

 Modifytarget cells with Al/Kapton window

 Speed up target motion and reduce friction in target motion

 Install and tune NMR coil for short target cell

 Laminate new NMR coils in FEP film (not kapton)

 Install short and long carbon targets

 Install target position potentiometer in target stick

 Cool down and polarize (late April/early May)

 Freeze and Irradiate fresh 15NH3