Broad bandpass spin polarizers for the ISIS second target station
✍ Scribed by R.M. Dalgliesh; A.A. van Well; S. Boag; T.R. Charlton; C.D. Frost; V.O. de Haan; S. Parnell; J. Plomp
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 341 KB
- Volume
- 397
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
The broad bandwidth of the ISIS second target station source (planned to be operational in 2008) provides a significant challenge for the production of highly polarized neutron beams. Four of the seven initial instruments are expected to have, or will develop, polarization capability. This is a significant step forward for ISIS where the only instrument currently equipped for routine polarized neutron-scattering measurements is the CRISP reflectometer. Of the initial instruments at the second target station the PolRef reflectometer is possibly the most demanding with an accessible wavelength range of 0.5-16 A ˚. Here, the development of designs and some initial test measurements for, relatively compact, compound polarizer designs will be discussed. These designs, based on both 3 He and polarizing supermirror technology, will allow as much of the PolRef wavelength range as possible, $2-16 A ˚, to be polarized to greater than 95% without unacceptable beam loss.