A cryostat to hold frozen-spin polarized HD targets in CLAS: HDice-II

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• 作者：M.M. Lowry^a ; ^{mlowry@jlab.org" class="auth_mail" title="E-mail the corresponding author} ; C.D. Bass^a ; ¹ ; A. D׳Angelo^a ; ^b ; A. Deur^a ; G. Dezern^a ; C. Hanretty^c ; D. Ho^d ; T. Kageya^a ; D. Kashy^a ; M. Khandaker^e ; V. Laine^a ; ^f ; T. O׳Connell^g ; O. Pastor^a ; P. Peng^c ; A.M. Sandorfi^a ; D. Sokhan^h ; ² ; X. Wei^a ; M. Zarecky^a
• 关键词：Dilution refrigerator ; Polarized target ; Hydrogen deuteride ; Frozen-spin target
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：11 April 2016
• 年：2016
• 卷：815
• 期：Complete
• 页码：31-41
• 全文大小：2751 K

文摘

The design, fabrication, operation, and performance of a ^3/4He 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%.