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IN12

The CRG instrument IN12 - a cold neutron 3-axis spectrometer - is a multi-purpose instrument for all kind of quasi-elastic signals or low-energy excitations. It will be moved from its current beam position and will be substantially upgraded to improve its neutron flux and energy range so as to open new experiment fields.

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Description

The IN12 instrument is operated by FZ Jülich in cooperation with the CEA Grenoble as a CRG-B instrument at the Institut Laue-Langevin. As a three axis spectrometer for cold neutrons IN12 is dedicated to high resolution-studies of low energy excitations. In the past years the instrument has demonstrated its excellent performance as one of the best spectrometers available for neutron scattering research.
In the framework of the Millenium Program of the ILL, IN12 will move to an end position on a new guide. This allows further improvements which will guarantee a powerful and unique instrument.

As a further option, the installation of a multi-analyzer option UFO (Universal Focusing Option) started in May 2010.

General view of the instrument

The Project Team

Phone number on the instrument  +33 (0)4 76 20 7088

SCHMALZL Karin

Scientific project leader

schmalzl(at)ill.eu

+33 (0)4 76 20 7348


RAYMOND Stephane

Scientist

raymond(at)ill.eu

+33 (0)4 76 20 7406


SCHMIDT Wolfgang F.

Scientist

schmidt(at)ill.eu

+33 (0)4.76.20.7427

PERROTT Leigh

guide technical project leader

perrott(at)ill.eu

+33 (0)4.76.20.7250


MOUNIER Christophe

Engineer

mounierc(at)ill.f

+33 (0)4.76.20.7810/7104



The project in short

Key components are:

  • H143, a new m=2 guide with an optimized ballistic shape and the virtual source concept together with a new double focusing PG monochromator
  • an extended wavelength range of 1.5 - 6.3 Å (now 2.4 - 6 Å)

The new design promises an increase of the overall count rate of an order of magnitude.
Additional components are planned to further improve the performance and efficiency of the spectrometer:

  • a new monochromator shielding adapted to the requirements of the end position, the higher flux and the larger angular range of the extended wavelength band
  • a velocity selector will eliminate higher order contributions and guarantee a low background
  • a guide changer with cavities and a transmission polarizer for an efficient and easy-to-use polarization of the incident beam
  • a guide changer in front of the monochromator to permit also a collimated beam option (high and tunable Q-resolution) instead of the focusing (high divergence) option - a rare option on many spectrometers but indispensable for many experiments like high pressure studies or UFO (see below)
  • optionally a perfectly bent silicon monochromator to focus the beam on small sample volumes

IN12 will be equiped with a multi-analyzer option UFO (Universal Focusing Option) but this will not be the only improvement.

References

  1. "IN12: The cold neutron three-axis spectrometer at the ILL" K. Schmalzl, W. Schmidt, S. Raymond, R. Hermann, H. Feilbach, K. Bussmann, T. Brückel, Scientific Report 2008', Forschungszentrum Juelich, page 210.
  2. "IN12-UFO: new frontiers for cold triple-axis spectroscopy", Wolfgang Schmidt, Michael Ohl, Physica B 385–386 (2006) 1073–1076.
  3. "UFO—a multi-analyser option for IN12", Wolfgang Schmidt, Maikel C. Rheinstädter, Stephane Raymond and Michael Ohl, Physica B: Condensed Matter, 350, Issue 1-3, 2004, E849-E851.

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