SIKA Project

Sika – Cold Neutron Triple-Axis Spectrometer
Instrument Scientists
Dr Shin-ichiro Yano
Dr Chun-Ming Wu
Dr Kirrily Rule

Instrument Cabin Phone 
+61 2 9717 3728

SIKA—Taiwan First Cold Neutron Triple-Axis Spectrometer Built at OPAL

The construction project of the cold neutron, triple-axis spectrometer named SIKA was completed at the end of 2012.  In 2013, National Central University who lead the construction project handed over the instrument to the National Synchrotron Radiation Research Center to lead the commissioning and user program.   In September 2014 we will have our first call for proposals, and officially open the instrument to domestic and international users.

SIKA is equipped with a large (230 x 252 mm2) double-focusing graphite monochromators to provide a large neutron flux on sample.  A 13 blade horizontal focusing graphite analyser combined with He-3 tube or a one-dimensional position sensitive detector (48 wires) provides for great flexibility on how the neutrons are detected.

The combination of high neutron flux, good energy and momentum resolution, low background and a large dynamic range will make SIKA ideally suited to study of spin and lattice dynamics, magnon and phonon dispersion relations in single crystal sample.  Relaxation phenomena, critical scattering, soft-modes, and relaxation-effects in complex fluids, magnetism, ionic conductors, catalysts, H storage and functional energy-related materials will also play an important role in the science output of SIKA.  

Specifications

Instrument location:
>Cold-Neutron Beam-Tube CG4 in reactor beam hall
Monochromator:
>Pyrolytic Graphite (002), double focusing, incident energy range 2.43 < Ei < 30 meV
Flux at sample position:
>Expected to be ~2.4 x108 n/cm2s at 2.1 Å 
(double focusing, virtual source width 5 cm)
Söller Collimators:
>Pre-monochromator, post-monochromator, pre-analyser collimators: open, 20’, 40’, 60’
>Pre-(single) detector collimators: open, 20’, 40’, 60’
>Pre-PSD collimator: radial collimator
Angular ranges:
>28.4o ≤ 2ΘM ≤ 120o
>-100o ≤ 2ΘS ≤ 100o
>-90o ≤ 2ΘA ≤ 90o
Analyser:
>Pyrolytic Graphite (002), 13 blades, each 20mm x 150mm (W x H), ±90˚ individually rotated
Available Filters:
>2 x PG filter
>Be filter works < 5 meV
Detectors:
>3He Single Detector
>1D Position Sensitive Detector (PSD)
Publication: 
1Emergence of the isotropic Kitaev honeycomb lattice α-RuCl3 and its magnetic properties
Sang-Youn Park, Seung-Hwan Do∗, Kwang-Yong Choi, D Jang, Tae-Hwan Jang, J Scheffer, Chun-Ming Wu, J S Gardner, J M S Park, Jae-Hoon Park∗ ,Sungdae Ji∗
J. Phys.: Condens. Matter 36, 215803 (2024). ANSTO (IF=2.700)
2High-order harmonics and the reverse of the squaring up process in the quasi-two-dimensional triangular-lattice magnet HoPdAl4Ge2
Fei Gao, Weijun Ren*, Chin-Wei Wang†, S. Yano, Calder Stuart, Qiang Zhang, Hengheng Wu, Meng An, Yanpei Jing, Bing Li‡, Zhidong Zhang
Phys. Rev. B 109, 134407 (2024). ANSTO,SNS (IF=3.700)
3Ultrahigh zT from strong electron–phonon interactions and a low-dimensional Fermi surface
V. K. Ranganayakulu, Te-Hsien Wang, Cheng-Lung Chen*, Angus Huang, Ma-Hsuan Ma, Chun-Min Wu, Wei-Han Tsai, Tsu-Lien Hung, Min-Nan Ou, Horng-Tay Jeng*, Chih-Hao Lee, Kuei-Hsien Chen, Wen-Hsien Li, Madison K. Brod, G. Jeffrey Snyder ,Yang-Yuan Chen*
Energy Environ. Sci., 17, 1904 (2024). ANSTO (IF=32.500)