Presentation on theme: "Polarized 3 He Target Lab Update Presented by Xiaohui Zhan MIT Hall A Collaboration Meeting, Dec. 14, 2007."— Presentation transcript:
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 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)
Oven/Support Structure Support piece on the bottom was burned, install new support structure. Working well: ~250 o C. Old cell Carlos was installed for test. Oven Cell
NMR & EPR Tests Good NMR signal EPR underway…
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.
Vertical Coils R = cm Z: Beamline Y: Vertically up X: Normal to YZ Measured Volume Vertical Coil 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.
BigBite Fringe Field Transver sity g2/d2(e,ed) Angle of BigBite -7 o 8o8o 2.8 o dBx/dx (mG/cm) dBz/dz (mG/cm) dBz/dx (mG/cm) BigBite clamp reduces the gradients by half compared to previous measurements. But also introduce the mirror coils. Simulation was done (Yi Qiang).
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)
To Do List 1.New oven test with all new cells (NMR, EPR, Spin-Flip). 2.Cell characterization. 3.New pick-up coils inside the oven. 4.Target spin sign signal/DAQ. 5.Target IOC. 6.Software collection & analysis. Will be ready before installation in May 1st, 2008! Thanks to: Jian-Ping, Todd, Walfgang, Al, Susan, Jaideep, Ameya, Aidan…