[ Identification | Description | Examples | Input parameters | Links ]

The TAS1_Powder Instrument

Example formerly known as linup-7.instr The conventional cold-source triple-axis spectrometer TAS1 at Risoe National Laboratory used with a powder 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.
The sample is a powder and the analyzer is a single plate.

Examples

(Test cases in bold)

• Test: PHM=-37.077 Detector: sng_I=2.26723e-07
• With TTA=0 the detector looks straight through the analyzer, so an OMA scan shows
• a transmission dip where the analyzer is at its Bragg angle:
• TestScan: mcrun TAS1_Powder.instr OMA=-19.45,-15.45 -N21 -n1e6 Detector: sng_I={21 values}

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
PHM	deg	Monochromator rotation 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	arcmin	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
OMA	deg	Analyzer rotation angle, aka A5	-17.45

Links

• Source code for TAS1_Powder.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.

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[ Identification | Description | Examples | Input parameters | Links ]

Generated for mcstas 3.10.0

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Last Modified: Friday, 23-Oct-2026 18:32:10 CEST