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IN15
IN15 High Resolution Spin-echo spectrometer
Characteristics
| Guide hall n°2, cold polarising guide H511 |
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| Neutron beam characteristics | |
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| diameter at sample position | 40 mm |
| incident wavelength | 6 ... 25 Å |
| monochromatisation Δλ/λ (FWHM) | 15% (velocity selector) |
| incident beam divergence | <17 mrad |
| polariser | V cavity, 1 m long (provided by HZB Berlin) |
| FeCo-Si supermirrors on Si substrate | |
| analyser | FeCo supermirrors (provided by HZB Berlin) |
| Precession coils | |
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| max. field of solenoid | 750 mT |
| max. field integral | 1.05 Tm |
| Detector | |
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| 32 x 32 pixels, each 1 cm2at a distance of 4.6 m from the sample1 bar3He and 0.3 bar CF4 | |
| area | 32 x 32 cm2 |
| pixel size | 1 cm2 |
| angular range θ | 2° ... 70° (Cryostat) |
| 2° ... 30° (Oven, Sample Changer) | |
| angular resolution | 2 x 10-3rad |
Instrument Description
The spin-echo spectrometer IN15 is a conventional spin echo spectrometer using a velocity selector and a neutron guide between selector and precession magnet.
A wide wavelength band is used covering a large area in q-time space even for one single detector position).
Normal mode of operation
Due to the use of neutrons of long wavelength (6 Å < λ < 25 Å) IN15 offers a better energy resolution (proportional to λ-3 ) than its predecessor IN11 and it reaches considerably lower q-values (proportional to λ-1 ).
Summary of the performance at λ = 17.3 Å
- The intensity is sufficiently high for typical small-angle scattering experiments.
- Maximum Fourier Time of 1000 ns
- Q-range from 0.01 Å-1 up to 0.42 Å-1