| EPSRC Reference: |
GR/R11957/01 |
| Title: |
Polarised Helium-3 Facility For Neutron Polarisation and Polarisation Analysis At Isis |
| Principal Investigator: |
Eccleston, Professor RS |
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| Department: |
ISIS Pulsed Neutron & Muon Source |
| Organisation: |
STFC Laboratories (Grouped) |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 November 2000 |
Ends: |
31 December 2002 |
Value (£): |
689,016
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| No relevance to Underpinning Sectors |
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Summary on Grant Application Form |
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The efficient broad band range and compact nature of Helium-3 based neutron polarisers have the potential to provide ISIS instruments with the option of full polarisation analysis and thereby dramatically enhance the information yield from many experiments. We propose to build and develop two Helium-3 neutron polarisers based on complementary techniques of metastable optical pumping of Helium-3 and indirect optical pumping of Rubidium vapour. Ongoing developments in fibre lasers and non-magnetic compressor technology combined with the expertise of our collaborators in cell production should enable a He-3 polarisation of greater than 70% (after compression) to be achieved. For efficient polarisatiuon of shorter wavelength neutrons the He-3 pressure must be increased considerably (P > 4 bar). We propose to develop an indirect optically pumped He-3 polarises for this purpose as optical pumping occurs directly at high pressure of the order of 4 - 8 bar. It is envisaged that exploratory experiments on incident neutron beam polarisation and wide angle analysis using the above two techniques will be conducted within the 4 year programme. The use of polarising filters on ISIS instruments will require the development of magnetic shielding equipment, this will be an important aspect of our programme.
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Key Findings |
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Potential use in non-academic contexts |
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Impacts |
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| Description |
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| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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