# The `Samples_Phonon` Instrument

*McStas: Simple test instrument for the Phonon_simple component*

## Identification

- **Site:** Tests_samples
- **Author:** <a href="mailto:kim.lefmann@risoe.dk">Kim Lefmann</a>
- **Origin:** <a href="http://www.risoe.dk/">RISOE</a>
- **Date:** Feb 2004

## Description

```text
Simple test instrument for the Phonon_simple component.
Refer to the component documentation for further instructions.
```

## Input parameters

Parameters in **boldface** are required; the others are optional.

| Name | Unit | Description | Default |
|------|------|-------------|---------|
| E | meV | Mean energy at source | 10 |
| DE | meV | Energy spread at source | 0 |
| HDIV | deg | Horizontal divergence produced from source | 1e-4 |
| VDIV | deg | Vertical divergence produced from source | 1e-4 |
| TT | deg | Two-theta detetector-angle | 72.69 |
| OM | deg | Sample rotation angle | -43.3 |
| C | meV/AA^(-1) | Sample velocity of sound | 8 |
| focus_r |  |  | 0 |
| focus_a |  |  | 0 |

## Links

- [Source code](Samples_Phonon.instr) for `Samples_Phonon.instr`.

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