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

The `Test_MCViNE_ConstantvQE` Instrument

Test of the MCViNE ConstantvQE kernel (fixed Q vector, Gaussian weight in E), as a Union process and as a standalone sample

Identification

Site: Tests_samples
Author: Fahima Islam
Origin: MCViNE (https://github.com/mcvine/mcvine) kernels ported to McStas
Date: 2026-09-29

Description

Monochromatic beam on a small sample described by the MCViNE ConstantvQE kernel.
comp_select=1 uses the Union process MCViNE_ConstantvQE_process (geometry, absorption
and multiple scattering by Union_master); comp_select=2 uses the standalone
component MCViNE_ConstantvQE with the same geometry, absorption and up to 20 orders of
scattering. The two should give the same scattered intensity (see the two
example lines below).

Examples

(Test cases in bold)

Test: comp_select=1 Detector: detector_I=3.17226e-07
Test: comp_select=2 Detector: detector_I=3.15729e-07

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
comp_select	1	1: Union process MCViNE_ConstantvQE_process in Union_master, 2: standalone MCViNE_ConstantvQE	1
Ei	meV	Incident energy	60
sample_rotation	deg	Rotation of the sample frame about the vertical axis	0

The Test_MCViNE_ConstantvQE Instrument

Identification

Description

Examples

Input parameters

Links

The `Test_MCViNE_ConstantvQE` Instrument