[ Identification | Description | Input parameters | Links ]

# The `ISIS_OSIRIS` Instrument

A simulation of the indirect TOF geometry part of the OSIRIS instrument.

## Identification

- Site: ISIS
- Author: Peter Christiansen with input from Mark Telling, updates by P Willendrup
- Origin: DTU Fysik, RISOE and ISIS
- Date: November 2015

## Description

    If LAMBDA = 0, the choppers are disabled, else the choppers are
    centered to chop around this wavelength and the source is studied in the
    interval LAMBDA +- DLAMBDA.

    IMPORTANT NOTES:

    1) Monchromator is not realistic in the sense that it does NOT
    smear the beam out according to the mosaicity, only does the N=1
    reflection, and the d-spread is handled in a simple way

    2) The instrument is not validated or certified by ISIS. Is only put in
    McStas for completeness.

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default
LAMBDA | AA | Mean wavelength at source | 6.66
DLAMBDA | AA | Wavelength spread at source | 0.1
GUIDEREFLECTIVITY | 1 | R0-reflectivity of guide | 1.0

## Links

- Source code for `ISIS_OSIRIS.instr`.

[ Identification | Description | Input parameters | Links ]