Polarized 3He Target Lab Update

1
Polarized 3He Target Lab Update

• Presented by
• Xiaohui Zhan
• MIT

Hall A Collaboration Meeting, Dec. 14, 2007
2
Outline

• Oven/Support Structure
• NMR EPR
• New Oven Other Designs
• Optics Design Orders
• Vertical Coils Test
• BigBite Frindge Field Investigation
• Software Target Spin Sign Signal
• Cell Production
• To Do List

Students Chiranjib Dutta (UKY), Joe Katich
(WM), Xiaohui Zhan (MIT) Postdoc Yi Qiang (DUKE)
3
Oven/Support Structure

• Support piece on the bottom was burned, install
  new support structure.
• Working well 250oC.
• Old cell Carlos was installed for test.

Oven
Cell
4
NMR EPR Tests

• Good NMR signal

• EPR underway

5
New Oven/Optics

• Ordered from Technical Products, Inc..
• New materical CS85 Structural Insulation.
• Weigh 29lbs with supports (current oven
  45lbs).
• Oven and support design was done, installation
  in February.

• Optics design is done!
• Most optics components ordered and in house.
• 6 single FAP and 2 duo FAP in lab, one new duo
  and single were ordered.
• Alignment for 2 lasers was done for the tests.

6
Vertical Coils
R 94.62 cm Z Beamline Y Vertically up X
Normal to YZ

• With 16A current, the average field generated by
  vertical coils is 31 Gaus in Y direction
  (vertical).
• Most field gradients inside lt 10mG/cm (absolute
  value).
• Large gradients (20mG/cm) only happen at the
  edge of the volume.

7
BigBite Fringe Field

• BigBite clamp reduces the gradients by half
  compared to previous measurements.
• But also introduce the mirror coils.
• Simulation was done (Yi Qiang).

8
Results of Simulation (Transversity)
9
Target Spin Sign SignalDAQ

• Flip target spin every 20min
• Hardware signal goes to CODA datastream
• Software signal LABVIEW to EPICS
• RF frequency monitoring quarter-wave plate
  rotation monitor

Cell Production

• 16 new cells were done! (8 from WM and 8 from
  UVa)

• Most cell polarization gt 40, a fewgt50, max60
  (WM)

10
To Do List

• New oven test with all new cells (NMR, EPR,
  Spin-Flip).
• Cell characterization.
• New pick-up coils inside the oven.
• Target spin sign signal/DAQ.
• Target IOC.
• Software collection analysis.

Will be ready before installation in May 1st,
2008!
Thanks to Jian-Ping, Todd, Walfgang, Al, Susan,
Jaideep, Ameya, Aidan