LET technical information
12 Aug 2009
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Primary Spectrometer
​Moderator​Coupled cold (18K H2)
​Choppers​2 double disc choppers (6,000-20,000rpm)
2 frame overlap choppers
1 Background suppression chopper
​Incident Energies​0.5 – 30meV (12 – 1.65 Å)
​Incident flight path​25m (m=3 converging guide, with m=4 focusing snout)


Sample 
Maximum energy resolution20µeV at Ei = 1meV
500µeV at Ei = 20meV
Maximum energy loss80% of incident energy
Minimum momentum transfer
Qmin = 0.032x√Ei
Maximum momentum transferQmax = 1.32x√Ei
Beam size
 ​20mm (horizontal) x 40mm (vertical)
Flux at 5meV and 2% resolution5 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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