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McStas: ILL_Lagrange Instrument at ILL

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

The ILL_Lagrange Instrument

IN1-Lagrange hot neutrons spectrometer for liquids at the ILL.

Identification

  • Site: ILL
  • Author: E. Farhi
  • Origin: LLB/ILL
  • Date: 13 Apr 2006
  • Version:(Unknown)

Description

IN1-Lagrange hot neutrons spectrometer for liquids at the ILL.

The dedicated liquid and amorphous instrument Lagrange is a spectrometer with 
constant final neutron energy, and variable incoming neutron energy.
The analyser is a focusing barrel covered with PG analyser, all focusing to
the detector. The flux is thus very high, and the resolution is that given
buy the PG crystal mocaicity.

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
PG       002 DM=3.355 AA
--------------------------

Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
lambda Angs Wavelength at monochromator 0.897
DM Angs d-spacing of monochromator 1.807
RV m Monochromator vertical curvature, 0=flat, -1=automatic -1
coh str File name for sample coherent scattering contribution "Rb_liq_coh.sqw"
inc str File name for sample incoherent scattering contribution "Rb_liq_inc.sqw"
L1 m Source-Monochromator distance 6.35
L2 m Monochromator-Sample distance 2.55
L3 m Sample-Detector distance 0.901
verbose 1 Print spectrometer configuration. 0 to be quiet 1

Links


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

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Mon Jun 26 12:27:17 2017


Last Modified: Monday, 26-Jun-2017 14:27:17 CEST
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