# The `Test_Magnetic_Rotation` Instrument

*McStas: This instrument demonstrates how to use the Pol_constBfield
component.*

## Identification

- **Site:** Tests_polarization
- **Author:** Peter Christiansen and Peter Willendrup
- **Origin:** RISOE
- **Date:** August 2006

## Description

```text
This instrument demonstrates how to use the component
Pol_constBfield to make a Mezei Spin flipper.

See:
Seeger et al. NIM A: Volume 457, Issues 1-2 , 11 January 2001, Pages 338-346
```

## Input parameters

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

| Name | Unit | Description | Default |
|------|------|-------------|---------|
| RESTORENEUT |  | RESTORE_NEUTRON flag for last monitor within field region. | 1 |

## Links

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

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