Large, mobile frozen-spin polarized solid HD

A completed system for producing large quantities of highly spin-polarized H and D in solid HD is described. It is of the relaxation-switched frozen-s pin type, in which relaxation is turned off after polarization at high B (1 7 T) and low T(15 mK), and the polarization is retained at high T (4 K) and low B (fractional Tesla). The first application is as targets for polarize d gammas at BNL, presently, three targets of 1.3 mol each are produced in a single run at Syracuse, cold transferred to a mobile storage cryostat with high field, transported to BNL, and cold-transferred there into an in-beam cryostat. (C) 2000 Elsevier Science B.V. All rights reserved.