The installation of the US-Japan
triple axis spectrometer at HFIR's cold guide 4 (CG4) is a continuation of the long
standing US-Japan Collaboration on Neutron Scattering between ISSP and BNL, now with the
cooperation of ORNL and JAERI. With the construction of HFIR's cold source and guide hall
comes the opportunity to create the second cold source triple axis in the US at modest
expense using in part some existing resources.
Fig 1. Schematic of the US-Japan triple axis
spectrometer at its future home at HFIR.
The first (and currently the only) such spectrometer in the US, SPINS, is
in high demand, so our instrument will be busy once commissioning is complete. Moreover,
we expect that our larger monochromator angle range and the use of adjustable arm lengths
will give our instrument added versatility. In addition to outside users, we expect to
support current active experimental programs of BNL, ORNL, and ISSP and seed collaboration
and cooperation between researchers from these institutions.
Fig 2. Countrate at detector, assuming a PG sample and
elastic scattering, for a variety of focal lengths. Each plot shows countrate for open,
80', 40' and 10' collimation. |
