Jülich Centre for Neutron Science
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J-NSE
Jülich Neutron Spin Echo Spectrometer at FRM-II

Local contact:
Olaf Holderer,
Michaela Zamponi
 

Neutron spin-echo (NSE) spectroscopy is a time-of-flight technique where very small velocity changes of the neutron during the scattering process are detected.
Neutron spin-echo spectrometers, with its very high energy resolution, allow for the analysis of slow motions on large and on intermediate length scales. They measure the intermediate scattering function S(q,t), the Fourier transform of the scattering function S(q,omega). The relevant resolution parameter is the maximum achievable Fourier time.

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Here you can get more information about J-NSE instrument.
J-NSE parameters Detailed description
Beam tube NL2a-o
Monochromators Short wavelength: bent section with FeSi m=3 remanent supermirror coating.
Long wavelengths: FeSi polarizer at entrance of spectromeeter
Polarized neutron flux:
(Sample position) 		7 Å: 1 x 107 n/cm2/s
12 Å: 6.8 x 105 n/cm2/s
Momentum transfer range: 0.02 - 1.5 Å-1
Fourier time range: 2 ps (4.5 Å) < τ < 350 ns (16 Å)
Wavelength: 4.5 - 18 Å
Incoming beam:
Cross section of guide: sample size: 		6 cm x 6 cm
3 cm x 3 cm (max.)
Collimation: By source and sample size or wire collimators 0.5o x 0.5o
Max. field integral: 0.5 Tm
Analyzer: 30 cm x 30 cm CoTi supermirror Venetian blind
Detector: 32 x 32 1 cm2 cells 3He multidetector

 
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last change 09.01.2008 | | Print