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ucph>Tommy: Created page with "The second axis in a triple axis spectrometer is the sample, from where the neutrons are scattered in an angle, we here denote TT. Use first a radius 10 mm / inner radius 6 mm..."

2019-07-14T21:43:34Z

Created page with "The second axis in a triple axis spectrometer is the sample, from where the neutrons are scattered in an angle, we here denote TT. Use first a radius 10 mm / inner radius 6 mm..."

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The second axis in a triple axis spectrometer is the sample, from where the neutrons are scattered in an angle, we here denote TT. Use first a radius 10 mm / inner radius 6 mm hollow vanadium sample (<tt>V_sample</tt>) and focus the outgoing scattering (in the simulations) on the analyzer below.

To form the third axis in the RITA-2 spectrometer, a PG analyzer crystal is placed 1.26 m from the sample. The size of the analyzer crystal is 0.150 m high and 0.025 m wide. Use the <tt>monochromator_flat</tt> component with the same parameters as for the monochromator.

The neutrons are scattered from the analyzer into the detector, which is a PSD detector, 0.30 m wide and 0.50 m high, \(128 \times 128\) pixels, placed 0.350 m from the analyzer. Usually, only the middle 19 mm of the detector is used.

Position the analyzer-detector to perform Bragg scattering for 5.0 meV neutrons. The scattering angle at the analyzer is denoted TTA. Confirm that neutrons reach the detector and that it is reasonable to use only 19 mm detector width. Estimate the effective detector height and use this value from here on.

{{hidden begin|toggle=right|title=McStas hint|titlestyle=background:#ccccff}}
You may like to test the set-up by inserting a \(4\pi\) monitor, centered at the vanadium sample.
{{hidden end}}

=====Experimental note: =====
At the RITA-2 instrument, several analyzer blades are used. We will, however, not go into details with that here.

Simulation Project tripleaxis: Analyzer and detector - Revision history

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ucph>Tommy: Created page with "The second axis in a triple axis spectrometer is the sample, from where the neutrons are scattered in an angle, we here denote TT. Use first a radius 10 mm / inner radius 6 mm..."