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Update on Polarized 3He Target Development at MIT: Advances and Future Plans

This presentation by Xiaohui Zhan at the MIT Hall Collaboration Meeting provides a comprehensive update on the polarized 3He target research. It covers key areas such as the new oven and support structures, NMR and EPR testing, optics design, vertical coils testing, and progress on cell production. The continued development includes advancements in target spin signals and software systems, with multiple new cells successfully produced. Future tasks are outlined, emphasizing readiness for installation by May 1, 2008.

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Update on Polarized 3He Target Development at MIT: Advances and Future Plans

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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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