Mar 20 – 23, 2023
Campus Garching
Europe/Berlin timezone

A 3T compatible in-situ 3He analyser for KWS1

Mar 20, 2023, 4:00 PM
Yards 4 - 6 (Fakultät für Maschinenwesen)

Yards 4 - 6

Fakultät für Maschinenwesen

Board: MO-277
Poster Neutron Instrumentation, Optics, Sample Environment, Detectors, and Software Poster Session MONDAY


zahir salhi (JCNS)


We present a compact 3He polariser to be used as polarisation analyser for KWS1.The 38 cm long magic box magnetic cavity with angled plates on the entrance side provides a 3He magnetic lifetime of 300 hours with the cell centred in the device, up to 7 cm diameter cell is used and polarization is performed with one laser, a relatively large angular coverage providing up to ±0.07 ̊A−1 at 4.5 ̊A is possible due to its close proximity to the sample and sample magnet .When used with the HTS-110, New Zealand sample magnet and a 3T horizontal (towards the 3He cell) field this magnetic lifetime was reduced to 163 hours , This level of performance is more than adequate, especially for an in-situ polarized system where spin- exchange rates on the order of 10 hours or less can be obtained . The system was recently used in tests at TU Delft and ISIS and 3He polarisation of 65 % was obtained.

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