[ Identification | Description | Input parameters | Links ]

# The `ILL_H53_D16` Instrument

The D16 diffractometer/reflectometer on the H53 curved cold guide at the ILL

## Identification

- Site: ILL
- Author: FARHI Emmanuel (farhi@ill.fr)
- Origin: ILL
- Date: Oct 7, 2008

## Description

    The H53 (120 x 60 mm2) curved cold guide feeds D16 (after IN14, and IN16).
    D16 is a two-circle diffractometer. The primary white beam is reflected by a
    focussing pyrolytic graphite monochromator (122 x 60 mm2 with mosaicity 0.7
    deg) providing an important flux at the sample. The monochromator housing has
    two beam holes at take-off angles of 90 deg and 115 deg, corresponding to 4.7
    Angs and 5.6 Angs beams and incorporates the slit systems.

    Example: m=1.2 Detector: Det_psd_I=6.4729E+03

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default
lambda | Angs | Wavelength at monochromator, computed from DM and THETA_M if left as 0. | 4.7
DM | Angs | d-spacing of monochromator, computed from lambda and THETA_M if left as 0. | 3.355
dlambda | AA | wavelength half width. | 0.05
Powder | str | File name for powder description. | "Na2Ca3Al2F14.laz"
RV | m | Monochromator vertical curvature, 0 for flat, -1 for automatic setting | -1
L1 | m | Guide-Monochromator distance | 0.1
L2 | m | Monochromator-Sample distance | 2.8
L3 | m | Sample-Detector distance | 1.0
THETA_M | deg | Monochromator take-off angle, computed from lambda and DM if left as 0. | 44.46
TwoTheta | deg | Detector rotation (in plane) | 0
RadiusDet | m | Detector entrance window radius | 0.36
DetEthick | m | Detector entrance window thickness | .01
DetEgap | m | Detector entrance window gap to flat detector inner window | 0.08
DetVthick | m | Detector active volume thickness | 5e-3
verbose | 1 | Print DIF configuration. 0 to be quiet | 1
TILT | deg | Monochromator additional tilt, for rocking curves | 0

## Links

- Source code for `ILL_H53_D16.instr`.
- The D16 diffractometer at the ILL

[ Identification | Description | Input parameters | Links ]