TITLE

Fiberoptic heterodyne magnetic field sensor for long-pulsed fusion devices

AUTHOR(S)
Tsuji-lio, S.; Akiyama, T.; Sato, E.; Nozawa, T.; Tsutsui, H.; Shimada, R.; Takahashi, M.; Terai, K.
PUB. DATE
January 2001
SOURCE
Review of Scientific Instruments;Jan2001, Vol. 72 Issue 1, p413
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A heterodyne polarimeter which measures the Faraday effect has been under development as a magnetic field sensor for long-pulsed fusion devices. The wavelength of laser beam was chosen to be 850 nm since the radiation-induced loss in optical fibers is significant below 800 nm while the Faraday rotation angle decreases with increasing wavelength. By the use of a distributed Bragg reflector laser diode and a Faraday isolator, excellent stability of phase measurement was attained. The phase resolution was raised to up to 0.02° by the digital complex demodulation and digital bandpass filtering of beat signals. Although the Verdet constant of heavily Tb[sup 3+]-doped paramagnetic glass is larger than that of ZnSe by about a factor of 1.4, ZnSe is superior to the former in terms of negligible temperature dependence. With a 40-mm-long ZnSe sensing rod, resolutions of the magnetic field strength of about 5 and 2 G were found to be possible with time responses of 1 and 10 ms, respectively. © 2001 American Institute of Physics.
ACCESSION #
4716881

 

Related Articles

  • Poloidal polarimeter system for current density measurements in ITER. Donne, A.J.H.; Edlington, T.; Joffrin, E.; Koslowski, H.R.; Nieswand, C.; Segre, S.E.; Stott, P.E.; Walker, C. // Review of Scientific Instruments;Jan1999, Vol. 70 Issue 1, p726 

    Describes the poloidal polarimeter system for current density profile measurements in the International Thermonuclear Experimental Reactor. Technical setup of the system; Viewing chords of the system; Optimum wavelength for the polarimeter; Detection scheme.

  • Application of interferometry and Faraday rotation techniques for density measurements on the next generation of tokamaks. Snider, R. T.; Carlstrom, T. N.; Hodapp, T. D.; Jobes, F. C.; Peebles, W. A. // Review of Scientific Instruments;Jan1997, Vol. 68 Issue 1, p728 

    Presents a design for a line average density diagnostic for the International Thermonuclear Experimental Reactor using collinear interferometry and Faraday rotation measurements. Diagnostic layout; Density measurement techniques; Probing beam wavelength considerations.

  • Investigation into the magnetic properties of Zn1-xMnxTe thin films by the Faraday effect. Masterson, H.J.; Lunney, J.G. // Journal of Applied Physics;1/15/1997, Vol. 81 Issue 2, p799 

    Investigates the concentration and temperature dependent Faraday rotation in a series of zinc 1-x manganese x tellurium (Zn1-xMnxTe) thin films produced by pulsed laser deposition. Direct relationship of peak rotation near the band edge to the sample magnetization in the high field limit of...

  • Analysis of the Dy contribution to the Faraday rotation of Bi-DylG film. Guillot, M.; le Gall, H. // Journal of Applied Physics;4/17/1997, Vol. 81 Issue 8, p5432 

    Reports that accurate measurements of the Faraday rotation (FR) on epitaxial garnet films of the composition {R3-xBix}[Fe2](Fe3)O12 with R=Dy, Y, and high Bi content are achieved. Temperature dependence of the spontaneous FR.

  • Dual CO[sub 2] laser polarimeter for Faraday rotation measurement in tokamak plasmas. Kawano, Yasunori; Chiba, Shin-ichi; Shirai, Hiroshi; Inoue, Akira; Nagashima, Akira // Review of Scientific Instruments;Jan1999, Vol. 70 Issue 1, p714 

    Describes the first operational results of the dual carbon dioxide laser polarimeter to measure Faraday rotation in large tokamaks. Components of the polarimeter; Photoelastic modulators utilized by each polarimeter; Successful measurement of the Faraday rotation by the JT-60U plasma even at a...

  • Faraday rotation measurements on compact helical system by using a phase sensitive heterodyne... Tanaka, K.; Kawahata, K.; Ejiri, A.; Howard, J.; Okajima, S. // Review of Scientific Instruments;Jan1999, Vol. 70 Issue 1, p730 

    Describes the installation of a phase sensitive heterodyne polarimeter on the compact helical system to measure the Faraday rotation angle from the phase variations in the magnetized plasma. Design and principle of operation of the polarimeter; Purpose of achieving stable density monitor;...

  • Multiple view fan beam polarimetry on Tokamak devices Geck, W. R.; Domier, C. W.; Luhmann, Jr., N. C. // Review of Scientific Instruments;Jan1997, Vol. 68 Issue 1, p416 

    Describes a polarimeter diagnostic which utilizes several fan beams to accumulate line integrated Faraday rotation data in a Tokamak plasma. Magnetic expansion technique; Multiple view reconstruction method.

  • Probing dynamics and pinning of single vortices in superconductors at nanometer scales. Embon, L.; Anahory, Y.; Suhov, A.; Halbertal, D.; Cuppens, J.; Yakovenko, A.; Uri, A.; Myasoedov, Y.; Rappaport, M. L.; Huber, M. E.; Gurevich, A.; Zeldov, E. // Scientific Reports;1/9/2015, p7598 

    The dynamics of quantized magnetic vortices and their pinning by materials defects determine electromagnetic properties of superconductors, particularly their ability to carry non-dissipative currents. Despite recent advances in the understanding of the complex physics of vortex matter, the...

  • A feasibility study of an infrared tangential viewing polarimeter for measurement of the electron density profile in ITER (abstract) Ma, C. H.; Hutchinson, D. P.; Richards, R. K.; Irby, J. // Review of Scientific Instruments;Jan1997, Vol. 68 Issue 1, p698 

    Presents the abstract of a paper reporting on preliminary results of a feasibility study of a carbon dioxide laser tangential viewing polarimeter for measuring electron density profiles in the International Thermonuclear Experimental Reactor (ITER). Electro-optic polarization modulation technique.

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics