The design, fabrication, operation, and performance of a He-3/4 dilution refrigerator and superconducting magnet system for holding a frozen-spin polarized hydrogen deuteride target in the Jefferson Laboratory CLAS detector during photon beam running is reported. The device operates both vertically (for target loading) and horizontally (for target bombardment). The device proves capable of maintaining a base temperature of 50 mK and a holding field of 1 T for extended periods. These characteristics enabled multi-month polarization lifetimes for frozen spin HD targets having proton polarization of up to 50% and deuteron up to 27%. (C) 2016 Elsevier B.V. All rights reserved.
Lowry, M., Bass, C., D'Angelo, A., Deur, A., Dezern, G., Hanretty, C., et al. (2016). A cryostat to hold frozen-spin polarized HD targets in CLAS: HDice-II. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 815, 31-41 [10.1016/j.nima.2015.12.063].
A cryostat to hold frozen-spin polarized HD targets in CLAS: HDice-II
D'ANGELO, ANNALISA;
2016-04-11
Abstract
The design, fabrication, operation, and performance of a He-3/4 dilution refrigerator and superconducting magnet system for holding a frozen-spin polarized hydrogen deuteride target in the Jefferson Laboratory CLAS detector during photon beam running is reported. The device operates both vertically (for target loading) and horizontally (for target bombardment). The device proves capable of maintaining a base temperature of 50 mK and a holding field of 1 T for extended periods. These characteristics enabled multi-month polarization lifetimes for frozen spin HD targets having proton polarization of up to 50% and deuteron up to 27%. (C) 2016 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
