Title: The NCNR Spin-Polarized Triple-Axis Spectrometer (SPINS)
1The NCNR Spin-Polarized Triple-Axis Spectrometer
(SPINS)
The SPINS instrument is located at the heart of
the cold neutron guide hall of the NIST Center
for Neutron Research.
SPINS
2The NCNR Spin-Polarized Triple-Axis Spectrometer
(SPINS)
- Incident Energy
- 14 2 meV ( 2.4 6.1 Å )
- Energy Resolution
- 0.02 1 meV
- Special Equipments
- Supermirror Transmission Polarizer
- A stack of single crystal Si plates with Fe/Si
supermirror coatings - Multi-crystal Analyzer
- 11 Horizontally Focusing PG Blades
- Position Sensitive Detector
- 3He, 20 25 cm2
- Filters
- PG or Be filters before sample
- Be or BeO filters after sample
The SPINS instrument with a super-conducting
magnet.
3The SPINS Operation Modes IConventional
Triple-Axis Spectroscopy (TAS)
A single point at a time
TAS is ideally suited for probing small regions
of phase space
Shortcoming Low data collection rate
4The SPINS Operation Modes II Horizontally
Focusing (HF) Analyzer Mode
Relaxed Q-resolution
Useful for studying systems with short-range
correlations
5The SPINS Operation Modes III Multiplexing
Detection System for TAS
1meV
qai qa D2qi qa - atan(x sinqa/(Lxcosqa)) kf
i ta/2sinqai Qi ki - kfi
Probes scattering events at different energy and
momentum transfers simultaneously
Survey (hw-Q) space by changing the incident
energy and scattering angle
6The SPINS Operation Modes IV Position-Sensitive
Detector in Two-Axis Mode
The filter passes only those neutrons with 0 lt Ef
lt Ecutoff
Large angular acceptance w / L 11o for SPINS