Dual CO[sub 2] laser polarimeter for Faraday rotation measurement in tokamak plasmas

Kawano, Yasunori; Chiba, Shin-ichi; Shirai, Hiroshi; Inoue, Akira; Nagashima, Akira
January 1999
Review of Scientific Instruments;Jan1999, Vol. 70 Issue 1, p714
Academic Journal
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 fast disruption.


Related Articles

  • CO2 laser polarimeter for Faraday rotation measurements in the DIII-D tokamak. Van Zeeland, M. A.; Boivin, R. L.; Carlstrom, T. N.; Deterly, T. M. // Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10E719 

    A tangential viewing, 10.59 μm CO2 laser polarimeter for electron density measurements based on plasma induced Faraday rotation has been installed on DIII-D. The system uses colinear right- and left-hand circularly polarized beams with a difference frequency of 40 MHz to generate the...

  • First measurement of tangential Faraday rotation of CO[sub 2] laser wave in a tokamak plasma. Kawano, Yasunori; Chiba, Shin-ichi; Shirai, Hiroshi; Inoue, Akira; Nagashima, Akira // Review of Scientific Instruments;Feb1999, Vol. 70 Issue 2, p1430 

    Demonstrates the first measurement of the Faraday rotation of carbon dioxide laser wave propagating in toroidally tangential direction in the JT-60U tokamak plasma. Reliable detection of the polarization angle using photoelastic modulators; Accuracy of the measured polarization angle.

  • CO[sub 2] laser polarimeter for electron density profile measurement on the Large Helical Device. Akiyama, T.; Tsuji-Iio, S.; Shimada, R.; Nakayama, K.; Okajima, S.; Takahashi, M.; Terai, K.; Tanaka, K.; Tokuzawa, T.; Kawahata, K. // Review of Scientific Instruments;May2003, Vol. 74 Issue 5, p2695 

    We developed a three-channel tangential CO[sub 2] laser polarimeter to measure electron densities on the Large Helical Device. Our system aims to obtain not only the line averaged electron density but also the electron density profile. The achieved resolution of the Faraday rotation angle was...

  • 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.

  • Upgrade of far-infrared laser-based Faraday rotation measurement on MST. Ding, W. X.; Brower, D. L.; Bergerson, W. F.; Lin, L. // Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D508 

    Recently, the far-infrared (FIR) laser (λ0=432 μm) Faraday rotation measurement system on MST has been upgraded. The dc flowing-gas discharge CO2 pump laser is replaced by a rf-excited, sealed CO2 laser at 9.27 μm (GEM select 100, Coherent Inc., Santa Clara, CA), which is subdivided...

  • Fiberoptic heterodyne magnetic field sensor for long-pulsed fusion devices. Tsuji-lio, S.; Akiyama, T.; Sato, E.; Nozawa, T.; Tsutsui, H.; Shimada, R.; Takahashi, M.; Terai, K. // Review of Scientific Instruments;Jan2001, Vol. 72 Issue 1, p413 

    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...

  • 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.

  • Conceptual design of the tangentially viewing combined interferometer-polarimeter for ITER density measurements. Van Zeeland, M. A.; Boivin, R. L.; Brower, D. L.; Carlstrom, T. N.; Chavez, J. A.; Ding, W. X.; Feder, R.; Johnson, D.; Lin, L.; O'Neill, R. C.; Watts, C. // Review of Scientific Instruments;Apr2013, Vol. 84 Issue 4, p043501 

    One of the systems planned for the measurement of electron density in ITER is a multi-channel tangentially viewing combined interferometer-polarimeter (TIP). This work discusses the current status of the design, including a preliminary optical table layout, calibration options, error sources,...


Read the Article

Courtesy of

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

Try another library?
Sign out of this library

Other Topics