Abstract
The high-resolution powder diffractometer (HRPD) has been upgraded with the installation of a 100 m supermirror guide. The guide is a unique ballistic design that is elliptic in both horizontal and vertical cross-section and utilizes a graded supermirror coating of between m=1.5 in the center to m=3 at the beam entry and exit points. Flux gains are considerable when compared to the performance of the original m=1 guide. The shallower radius of curvature (36 km) of the new guide also permits transmission of short wavelength neutrons previously cut off. The flux gains have been achieved whilst retaining the high resolution at backscattering, Δd/d∼5×10-4. Results following initial commissioning studies are described highlighting the new capabilities of the instrument and new scientific opportunities resulting from the upgrade are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 47-49 |
| Number of pages | 3 |
| Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
| Volume | 600 |
| Issue number | 1 |
| DOIs | |
| State | Published - Feb 21 2009 |
| Externally published | Yes |
Funding
Design, manufacture and installation of the supermirror guide took place between September 2005 and November 2007 and was funded through the CCLRC Facility Development Project Grant Scheme. It is a pleasure to acknowledge the contributions of colleagues K.S. Knight, L.C. Chapon and P.G. Radaelli from the ISIS Crystallography Group, B.H. Holsman as Project Manager, S.P. Waller as Project Designer, and all members of the technical support teams at ISIS. The guide was supplied by Swiss Neutronics, Klingnau, Switzerland and the assistance of Ch. Schanzer and P. Weber is gratefully acknowledged.
| Funders | Funder number |
|---|---|
| CCLRC |
Keywords
- Benzene
- High-resolution neutron powder diffraction
- Neutron optics