Let technical information
12 Aug 2009
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Technical specifications relating to LET

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Primary Spectrometer
​Moderator​Coupled cold (18K H2)
​Choppers​2 double disc choppers (6,000-20,000rpm)
1 frame overlap chopper
1 Background suppression chopper
​Incident Energies​0.5 – 30meV (12 – 1.65 Å)
​Incident flight path​25m (m=3 converging guide)


Sample
​Maximum energy resolution​5µeV at Ei = 1meV
260µeV at Ei = 20meV
​Maximum energy loss​80% of incident energy
​Minimum momentum transfer​Qmin = 0.032x√Ei
​Maximum momentum transfer​Qmax = 1.32x√Ei
​Beam size​40 x 50mm
​Flux at 5meV and 2% resolution​5 x 104n cm-1s-1


Secondary Spectrometer
Detector typePosition sensitive 3He counters
Sample to detector​3.5m
Horizontal angular range--40o to +140o
Vertical angular range
± 30o

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