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Polarized 3 He Target Lab Update

Polarized 3 He Target Lab Update. Presented by Xiaohui Zhan MIT. Hall A Collaboration Meeting, Dec. 14, 2007. Outline:. Oven/Support Structure NMR & EPR New Oven & Other Designs Optics Design & Orders Vertical Coils Test BigBite Frindge Field Investigation

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Polarized 3 He Target Lab Update

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  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 (W&M), 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 Coil Measured Volume 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 < 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 Signal+DAQ • 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 W&M and 8 from UVa) • Most cell polarization > 40%, a few>50%, max~60% (W&M)

  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…

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