Speaker
Description
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.
