Advances in polarized neutron scattering experiments on TAS-1 at JRR-3

研究用原子炉JRR-3のTAS-1中性子分光器における偏極中性子散乱実験の進展

武田 全康  ; 中村 充孝   ; 下条 豊; 加倉井 和久; Lelivre-Berna, E.*; Tasset, F.*; Regnault, L. P.*

Takeda, Masayasu; Nakamura, Mitsutaka; Shimojo, Yutaka; Kakurai, Kazuhisa; Lelivre-Berna, E.*; Tasset, F.*; Regnault, L. P.*

JRR-3のTAS-1中性子分光器における偏極中性子利用に関して現状を報告する。TAS-1は改3号炉に設置された熱中性子三軸分光器で、1991年に改3号炉の稼動とともに運転を開始した。今から5年前に最近の偏極中性子技術の進展を考慮すべく、この分光器の偏極中性子高度化が開始された。ダブル集光型偏極中性子モノクロメーター及びアナライザーが導入され、CRYOPADと呼ばれる3次元偏極中性子解析装置が開発,設置された。上記の新しい偏極素子により、約1桁程度の偏極中性子強度の増加が達成され、1次元及び3次元偏極中性子解析がTAS-1分光器を使用して行われるようになった。

The status of the polarized neutron options on TAS-1 is reported. TAS-1 is a thermal neutron triple-axis spectrometer installed at JRR-3 of JAEA and has been operational since 1991. Following the recent advances in the polarization analysis technique an upgrading program of polarized neutron options for TAS-1 was started five years ago. In this program new doubly-focusing-polarizing Heusler monochromator and analyzer were introduced to TAS-1. In addition, one of three third-generation CRYOPAD(CRYOgenic Polarization Analysis Device)s which were assembled for ILL(D3), CEA-Grenoble(IN22) and JAEA was installed on TAS-1 to enable the spherical polarization analysis. Using the increased polarized neutron flux elastic and inelastic polarized neutron scattering experiments with the conventional setup for the one-dimensional polarization analysis and with CRYOPAD for the three-dimensional polarization analysis are now routinely performed on TAS-1.