Instrument
Overview
The HQR instrument is a conventional triple-axis spectrometer, which allows measurement with less background because of the T1 neutron guide tube in the beam hall that is dedicated for thermal-neutron range.
In addition to the service for the general use program conducted by ISSP of University of Tokyo, the HQR spectrometer is applied to the student exercise of the Institute of Quantum Beam Sciences, Graduate School of Science and Engineering, Ibaraki University.
The logbook of spectrometer setup before the JRR-3 restart, which was conducted by Prof. Taro Nakajima (ISSP), is here.
Monochromator: PG002 vertically focused. Ei = 13.5 meV (λ = 2.445 Å, 2θM = 43.5°) fixed.
Analyzer: PG002 vertically focused. –5 °< 2θA < 90° (–10 ≲ ΔE ≲ +10 meV)
Sample stage: beam size = 20 × 40 mm, –90 °< 2θS < 150°
Detector: 3He detector (2 inches in diameter and 100 mm in length)
Monitor: 3He detector
Collimation: 2nd (10', 20', 40', open), 3rd (20', 40', 60'), 4th (20', 40', 60')
PG filters
Options: 4K GM refrigerator, Polarized-beam super mirror (in commission)
Measurement examples
The inelastic scattering demonstration using a single crystalline sample of silcon is presented.
The diffractions from the antiferromagnetic ordered structure in Nd3Ir4Sn13 were observed as shown below. The sample size was approximately 1– 2 mm in diameter, and the 1-K helium-3 closed cycle refrigerator was used on the T1-1 HQR spectrometer.
IRT members
K. Ohoyama (Graduate School of Sci. and Eng., Ibaraki Univ.): Instrumental responsible K. Ohoyama's Lab. HP
K. Iwasa (Frontier Research Center for Applied Atomic Sciences, Ibaraki Univ.) K. Iwasa's Lab. HP
M. Yokoyama (Graduate School of Sci. and Eng., Ibaraki Univ.) M. Yokoyama's Lab. HP
T. Nakano (Graduate School of Sci. and Eng., Ibaraki Univ.) T. Nakano's Lab. HP
K. Kuwahara (Graduate School of Sci. and Eng., Ibaraki Univ.)
F. Iga (Graduate School of Sci. and Eng., Ibaraki Univ.)
T. Nakajima (Neutron Science Laboratory, Institute for Solid State Physics, The Univ. of Tokyo) T. Nakajima's Lab. HP