[ Identification | Description | Input parameters | Links ]

# The `TAS1_Diff_Vana` Instrument

The conventional cold-source triple-axis spectrometer TAS1 at Risoe National Laboratory used as a diffractometer for an alignment study with a vanadium sample.

## Identification

- Site: Risoe
- Author: A. Abrahamsen, N. B. Christensen, and E. Lauridsen
- Origin: Risoe
- Date: 1998

## Description

    This instrument is the conventional cold-source triple-axis spectrometer TAS1
    at Risoe National Laboratory. It does not exist anymore, but was used as the
    first detailed work performed with the McStas package.
    Here it is used as a diffractometer for an alignment study. The
    sample is a vanadium cylinder and there is no analyzer.

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default
PHM | deg | Monochromator arm angle, aka A1 | -37.077
TTM | deg | Monochromator take-off angle, aka A2 | -74
TT | deg | Take-off angle at the sample position, aka A4 | 33.52
TTA | deg | Take-off angle at the analyzer position, aka A6 | 0
C1 | min | Collimator 1 aperture (mono-sample arm) | 30
OMC1 | deg | Tilt angle of the Collimator 1 | 5.5
C2 | min | Collimator 2 aperture (sample-ana arm) | 28
C3 | min | Collimator 3 aperture (ana-detector arm) | 67

## Links

- Source code for `linup-4.instr`.
- The McStas User manual
- A. Abrahamsen, N. B. Christensen, and E. Lauridsen. McStas simulations of the TAS1 spectrometer. Student's report, Niels Bohr Institute, University of Copenhagen, 1998.

[ Identification | Description | Input parameters | Links ]