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

# The `ILL_D9` Instrument

The D9 hot diffractometer at the ILL.

## Identification

- Site: ILL
- Author: Chris Ling. DIF Group.
- Origin: ILL (France)
- Date: 6th Jan 2004.
- Version: 1.4

## Description

    The hot neutron four-circle diffractometer D9 at the ILL.
    For structural analysis beyond the determination of average atomic positions,
    high resolution nuclear density maps are required. D9 is ideally suited for
    this purpose. Because of the short wavelength very small atomic displacements
    can be identified, accurate to typically 0.001 � A two-dimensional
    multidetector is employed.
    This simulation uses a quartz single crystal sample.

    NOTE: as no transmission monochromator component is presently available,
    this simulation uses a monochromator in reflection, the width of which is
    automatically adjusted so that the outcoming beam has the same width as
    that of a 6.5 cm wide transmission monochromator at the same take-off angle

    example (single image on detector):
      mcrun D9_instr -n 1e8 Lambda=0.65 TwoTheta=60 Nu=15 delta_Omega=0

    example (peak scan):
      mcrun D9_instr -n 1e7 Lambda=0.65 TwoTheta=60 Nu=0
        delta_Omega=-1.8,1.8 -N 31 -d Scan_0.65_60_0

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default
--- | --- | --- | ---
Lambda | Angstrom | wavelength | 0.65
TwoTheta | degree | 2-Theta of sample reflection | 60
Nu | degree | lifting-arm angle | 15
delta_Omega | degree | start,end of omega scan | 0

## Links

- Source code for `ILL_D9.instr`.
- D9@ILL (YellowBook)

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