HDice, Highly-Polarized Low-Background Frozen-Spin HD Targets for CLAS experiments at Jefferson Lab

Conference · Sat Dec 01 00:00:00 EST 2012 · J. Phys.: Conf. Ser.

DOI:https://doi.org/10.1088/1742-6596/400/5/052042· OSTI ID:1088372

Wei, Xiangdong ^[1]; Bass, Christopher ^[1]; D'Angelo, Annalisa ^[2]; Deur, Alexandre P. ^[1]; Dezern, Gary L. ^[1]; Ho, Dao Hoang ^[3]; Kageya, Tsuneo ^[1]; Khandaker, Mahbubul A, ^[4]; Kashy, David H. ^[1]; Laine, Vivien Eric ^[5]; Lowry, Michael M. ^[1]; O'Connell, Thomas Robert ^[6]; Sandorfi, Andrew M. ^[1]; Teachey, II, Robert W. ^[1]; Whisnant, Charles Steven ^[7]; Zarecky, Michael R. ^[1]

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1. Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
2. INFN-Roma Tor Vegata, Rome (Italy)
3. Carnegie Mellon University, Pittsburgh, PA (United States)
4. Idaho State University, ID (United States)
5. Blaise Pascal University, Clermont-Ferrand (France)
6. University of Connecticut, Storrs, CT (United States)
7. James Madison University, Harrisonburg PA (United States)

Large, portable frozen-spin HD (Deuterium-Hydride) targets have been developed for studying nucleon spin properties with low backgrounds. Protons and Deuterons in HD are polarized at low temperatures (~10mK) inside a vertical dilution refrigerator (Oxford Kelvinox-1000) containing a high magnetic field (up to 17T). The targets reach a frozen-spin state within a few months, after which they can be cold transferred to an In-Beam Cryostat (IBC). The IBC, a thin-walled dilution refrigerator operating either horizontally or vertically, is use with quasi-4{pi} detector systems in open geometries with minimal energy loss for exiting reaction products in nucleon structure experiments. The first application of this advanced target system has been used for Spin Sum Rule experiments at the LEGS facility in Brookhaven National Laboratory. An improved target production and handling system has been developed at Jefferson Lab for experiments with the CEBAF Large Acceptance Spectrometer, CLAS.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1088372
• Report Number(s): JLAB-PHY-11-1459; DOE/OR/23177-2620; TRN: US1300329
• Journal Information: J. Phys.: Conf. Ser., Vol. 400; Conference: 26th International Conference on Low Temperature Physics (LT26), Beijing (China), 10-17 Aug 2011
• Country of Publication: United States
• Language: English

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43 PARTICLE ACCELERATORS