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Details of Grant 

EPSRC Reference: GR/R11957/01
Title: Polarised Helium-3 Facility For Neutron Polarisation and Polarisation Analysis At Isis
Principal Investigator: Eccleston, Professor RS
Other Investigators:
Frost, Dr CD Morris, Professor PG Langridge, Professor S
Andersen, Dr K
Researcher Co-Investigators:
Project Partners:
Indiana University - Bloomington Institut Laue-Langevin National Institute of Standards and Tech
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
EPSRC Research Topic Classifications:
Quantum Fluids & Solids
EPSRC Industrial Sector Classifications:
No relevance to Underpinning Sectors
Related Grants:
Panel History:  
Summary on Grant Application Form
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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