Author/Authors :
Bass، نويسنده , , C.D. and Bade، نويسنده , , C. and Blecher، نويسنده , , M. and Caracappa، نويسنده , , A. and DʹAngelo، نويسنده , , A. and Deur، نويسنده , , A. and Dezern، نويسنده , , G. and Glueckler، نويسنده , , H. and Hanretty، نويسنده , , C. and Ho، نويسنده , , D. and Honig، نويسنده , , A. and Kageya، نويسنده , , T. and Khandaker، نويسنده , , Kristiina M. and Laine، نويسنده , , V. and Lincoln، نويسنده , , F. and Lowry، نويسنده , , M.M. and Mahon، نويسنده , , J.C. and OʹConnell، نويسنده , , T. and Pap، نويسنده , , M. and Peng، نويسنده , , P. and Preedom، نويسنده , , B. and Sandorfi، نويسنده , , A.M. and Seyfarth، نويسنده , , H. and Stroeher، نويسنده , , Mogens H. and Thorn، نويسنده , , C.E. and Wei، نويسنده , , X. and Whisnant، نويسنده , , C.S.، نويسنده ,
Abstract :
A device has been developed with moveable liquid nitrogen and liquid helium volumes that is capable of reaching over 2 m 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 very little polarization loss for either H (−1±2%, relative) or D (0±3%, relative) 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.
