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Dynamic nuclear polarization system for the SANS-J-II spectrometer at JAEA

机译:JAEA SANS-J-II光谱仪的动态核极化系统

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We have developed a dynamic nuclear polarization (DNP) system for the SANS-J-II spectrometer at the JRR-3 atomic research reactor of Japan Atomic Energy Agency (JAEA). The DNP system is composed of a split-type horizontal superconducting magnet (3.3 T), a Gunn oscillator as a microwave source (94 GHz), and a cryostat (1.2 K). In particular, a sample cell with empty set 40 in inner diameter and the magnet with a field homogeneity of 5 x 10(-5) in a volume of empty set 25 mm x 8 mm were employed to polarize samples with a diameter of empty set 20mm for the ultra small-angle scattering experiment using the magnetic lens installed at the SANS-J-II spectrometer [S. Koizumi, H. Iwase, J. Suzuki, T. Oku, R. Motokawa, H. Sasao, H. Tanaka, D. Yamaguchi, H.M. Shimizu, T. Hashimoto, J. Appl. Crystallogr. 40 (2007) s474]. We obtained the proton polarization |P| = 32% in the polyethylene doped with 2,2,6,6-tetra-methyl-piperidine-1-oxyl (TEMPO).
机译:我们已经在日本原子能机构(JAEA)的JRR-3原子研究堆上为SANS-J-II光谱仪开发了动态核极化(DNP)系统。 DNP系统由分体式水平超导磁体(3.3 T),作为微波源的Gunn振荡器(94 GHz)和低温恒温器(1.2 K)组成。特别是,使用内径为空集40的样品池以及在空集为25 mm x 8 mm的体积中磁场均匀度为5 x 10(-5)的磁体来极化具有空集的直径的样品使用安装在SANS-J-II光谱仪上的磁透镜进行20mm的超小角度散射实验[S.小泉,岩濑H.铃木J.奥库T.本川R. Sa骚H.田中H.山口D.山口D.H.M. Shimizu,T. Hashimoto,J. Appl。 Crystallogr。 40(2007)s474]。我们获得了质子极化| P |在掺杂有2,2,6,6-四甲基-哌啶-1-氧基(TEMPO)的聚乙烯中= 32%。

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