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HODACA (HOrizontally Defocusing Analyzer Concurrent data Acquisition spectrometer) is a multiplex inelastic neutron spectrometer installed at the C1-1 cold-neutron beam port of JRR-3.
Equipped with 24 analyzer–detector channels, HODACA enables efficient measurements of low-energy excitations over a wide range of momentum and energy transfer.
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About HODACA
About HODACA
HODACA is designed for efficient measurements of low-energy magnetic excitations, phonons, and other collective excitations in condensed-matter systems.
The secondary spectrometer uses multiple pyrolytic graphite analyzers and detectors to measure scattered neutrons at many scattering angles simultaneously while operating at a fixed final neutron energy.
For detailed instrument geometry, specifications, and accessible Q-E ranges, see Instrument & Specifications.
C1-1 also hosts the conventional triple-axis spectrometer [HER@C11].
Key specifications
Key specifications
Beam port
C1-1, JRR-3
Analyzer–detector channels
24
Angular spacing between channels
2°
Final neutron energy
Ef = 3.635 meV
Incident neutron energy
Ei = 2.1–11 meV
Typical energy resolution
Approximately 0.1–0.2 meV
Reference
Reference
H. Kikuchi, S. Asai, T. J. Sato, T. Nakajima, L. Harriger, I. Zaliznyak, and T. Masuda,
“A New Inelastic Neutron Spectrometer HODACA,”
Journal of the Physical Society of Japan 93, 091004 (2024).
[Instrument paper] | [Preprint]
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