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Title: A portable cryostat for the cold transfer of polarized solid HD targets: HDice-I

A device has been developed with moveable liquid nitrogen and liquid helium volumes that is capable of reaching over two meters into the coldest regions of a cryostat or dilution refrigerator and reliably extracting or installing a target of solid, polarized hydrogen deuteride (HD). This Transfer Cryostat incorporates a cylindrical neodymium rare-earth magnet that is configured as a Halbach dipole, which is maintained at 77 K and produces a 0.1 T field around the HD target. Multiple layers provide a hermetic 77 K-shield as the device is used to maintain a target at 2 K during a transfer between cryostats. Tests with frozen-spin HD show negligible polarization loss for either H or D over typical transfer periods. Multiple target transfers with this apparatus have shown an overall reliability of about 95% per transfer, which is a significant improvement over earlier versions of the device.
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  1. JLAB, Newport News, VA (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-PHY--13-1788; DOE/OR--23177-2732
Journal ID: ISSN 0168-9002; TRN: US1400131
DOE Contract Number:
AC02-98-CH10886 ; AC05-06OR23177
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; Journal Volume: 737
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE SC Office of Nuclear Physics (SC-26) (United States)
Country of Publication:
United States
43 PARTICLE ACCELERATORS Solid hydrogen deuteride; Frozen-spin target; Spin relaxation; Halbach rare-earth magnet