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Submillimeter Polarization Spectroscopy in Pulsed Magnetic Fields

#2459


Study of Opportunities for the Submillimeter Polarizational Spectroscopy in Pulsed Magnetic Fields up to 50 T

Tech Area / Field

  • PHY-OPL/Optics and Lasers/Physics
  • PHY-RAW/Radiofrequency Waves/Physics
  • PHY-SSP/Solid State Physics/Physics

Status
8 Project completed

Registration date
22.03.2002

Completion date
17.01.2008

Senior Project Manager
Tyurin I A

Leading Institute
Institute of General Physics named after A.M. Prokhorov RAS, Russia, Moscow

Supporting institutes

  • Kurchatov Research Center, Russia, Moscow

Collaborators

  • Universitat Stuttgart/Physikalisches Institut, Germany, Stuttgart\nNational Pulsed Magnetic Field Laboratory, France, Toulouse

Project summary

The Project goal is to study and develop the polarization sub millimeter spectroscopy in the high pulsed magnetic fields with the strength of up to 50 T.

The opportunities of this technique have recently been expanded due to the development of a technique for measuring the polarization and elliptical plane rotation spectra which has been used for studying magneto optical effects in the range of an antiferromagnetic resonance. The very fact that this technique is used, as a rule, in the absence of a magnetic field or in the comparatively - low fields, (up to 7 T) is an essential limitation to it. The usage of the quasi-optical polarization BWO -spectroscopy technique in combination with the pulsed magnetic fields up to 50 T opens new opportunities for studying magnetic resonance properties of substances. Pulsed magnetic field up to 50 T having a pulse duration of 200 s will be in use.

The expected main results of Project are:

· production of a polarization sub millimeter spectrometers with the pulsed magnetic field up to 50 T having a pulse duration of 200 s;

· development of a technique to detect the signals from the polarization sub millimeter spectrometer combined with the pulsed magnetic field having of the 0.1 - 1 ms durations;

· measurements by the technique of quasioptical polarization spectroscopy in the pulsed magnetic fields up to 50 T.

In contrast to a traditional magnetic resonance technique of the millimeter and sub millimeter wavelengths, using waveguides (or light guides) with the non-controlled radiation polarization, the quasioptical technique implementation allows one to realize precise polarization measurements. The emergence of such instruments in the research laboratories will stimulate an expansion of spectroscopic studies in solids with a sub millimeter range and result in a progress in understanding of the physical processes within the condensed matter.

The work includes the following main tasks:

· production of the polarization sub millimeter spectrometer compatible with the generator of high pulsed magnetics field;

· development and production of the pulsed magnetic field generator for the sub millimeter spectrometer;

· development, production and test of system for registering and processing the experimental data and the software;

· assembly, adjustment and tests of the spectrometer with the pulsed magnetic field on the basis of the polarization sub millimeter spectrometer and of the pulsed magnetic field generator;

· polarization sub millimeter spectroscopy in the pulsed magnetic fields, demonstration of the instrument operation; realization of tests.

A progress in the technique of registering electrical and optical signals for the recent two-three decades allows one to hope on the successful realization of the sub millimeter spectroscopy in the pulsed fields with the duration at the level of 100 s. In this case, the pulsed magnetic field generator will have small dimensions, its mass will be of about 100 kg, capacitive storage energy will be equal to a few tens kJ.

The works on Project will be carried out in a collaboration with the scientists from Europe (Germany), USA and Japan. Collaboration with a group of the pulsed magnets at the National Laboratory of high magnetic fields, USA will be concentrated on the problem of designing solenoids, their service lives, measurement of the magnetic field distributions in the solenoid and on the numerical simulation


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