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Cold neutron backscattering spectrometer IN16

The backscattering spectrometer IN16 uses neutron optical focusing in the primary spectrometer. As a consequence IN16 has a higher flux than IN10 and maintains perfect backscattering condition in the primary spectrometer at the expense of Q-resolution.

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Instrument Description

guide hall n°2, cold neutron guide H53

beam size at specimen

3.0 x 4.0 cm2

sample environment

cryofurnace

1.5 - 540 K, 47 mm Ø

furnace

300 - 1300 K

detectors

standard setup: multidetector array (20 3He counters) + 2 3He counters; or up to 8 3He single counters; 1 monitor
For diffraction: 160 3He-counters (320 grouped by two)

Instrument configurations

 

high resolution

low resolution

unavailable now

planned

monochromator

Si (111)

Si (111)

Si (311)

Si1-x Gex (111)

analyser

Si (111)

Si (111)

Si (311)

Si (111)

flux at sample /
n cm-2 s-1

~ 2 x 104

~ 5±4 x 104

5 x 103

5 x 104

incident energy
Ei / meV

2.08

2.08

7.63

2.07

incident wavelengths
/ Å

6.271

6.271

3.275

6.30

energy resolution
ΔE / µeV (FWHM)

Lorentzian like
0.3 - 0.4

Gaussian like
0.9

~ 2.5

1

energy range
ΔE / µeV

-15 ... 15

-15 ... 15

-28 ... +28

-2 ... +28

elastic Q-range
/ Å-1

0.02 ... 1.9

0.02 ... 1.9

1.7 ... 3.7

0.07 ... 2.0

 

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