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

The ILL_D4 Instrument

D4 Diffractometer for liquids at the ILL.

Identification

• Site: ILL
• Author: E. Farhi
• Origin: LLB/ILL
• Date: 13 Apr 2006

Description

D4 Diffractometer for liquids at the ILL, installed on the hot source.

The dedicated liquid and amorphous instrument D4 is a two-axis diffractometer
equipped with nine 1D position sensitive microstrip detectors. In this model,
a PSD banana detector is also present.

The monochromator take-off angle is 2Theta_M ~ 20-25 deg, variable. The available
monochromators are all vertically focusing, Cu (200) for 0.7 Angs, Cu (220)
for 0.5 Angs.

Cu       002 DM=1.807 AA
Cu       220 DM=1.278 AA

Examples

(Test cases in bold)

• Test: lambda=0.7 Detector: BananaTheta_I=1.44351e+06

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
lambda	AA	Wavelength at monochromator	0.7
DM	AA	d-spacing of monochromator	1.807
sample	str	File name for powder/liquid description LAU/LAZ/qSq/Sqw	"SiO2_liq.qSq"
RV	m	Monochromator vertical curvature, 0 for flat, -1 for automatic setting	-1
L1	m	Source-Monochromator distance	6.4
L2	m	Monochromator-Sample distance	2.61
L3	m	Sample-Detector distance	1.148
verbose	1	Print DIF configuration. 0 to be quiet	1

Links

• Source code for ILL_D4.instr.
• The D4 diffractometer at the ILL

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

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Last Modified: Sunday, 11-Oct-2026 15:14:09 CEST