Multiple view fan beam polarimetry on Tokamak devices

Geck, W. R.; Domier, C. W.; Luhmann, Jr., N. C.
January 1997
Review of Scientific Instruments;Jan1997, Vol. 68 Issue 1, p416
Academic Journal
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.


Related Articles

  • Faraday rotation densitometry for Large Helical Device. Akiyama, T.; Sato, E.; Nozawa, T.; Tsuji-Iio, S.; Shimada, R.; Murayama, H.; Nakayama, K.; Okajima, S.; Tanaka, K.; Watanabe, K.; Tokuzawa, T.; Kawahata, K. // Review of Scientific Instruments;Jan2001, Vol. 72 Issue 1, p1073 

    A CO[sub 2] laser polarimeter to measure the Faraday rotation in the large helical device (LHD) was developed and installed on a LHD. A CO[sub 2] laser whose wavelength is 10.6 μm was selected to avoid effects of the refraction. The Faraday rotation angle along toroidally tangential chords is...

  • Short wavelength far infrared laser polarimeter with silicon photoelastic modulators. Akiyama, T.; Kawahata, K.; Tanaka, K.; Okajima, S.; Nakayama, K. // Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10E720 

    A short wavelength far infrared laser whose wavelength λ is about 50 μm is preferable for a polarimeter and an interferometer for high density operations in the Large Helical Device (LHD) and on future large fusion devices such as ITER. This is because the beam bending effect (∝λ2)...

  • 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...

  • High resolution polarimeter-interferometer system for fast equilibrium dynamics and MHD instability studies on Joint-TEXT tokamak (invited). Chen, J.; Zhuang, G.; Li, Q.; Liu, Y.; Gao, L.; Zhou, Y. N.; Jian, X.; Xiong, C. Y.; Wang, Z. J.; Brower, D. L.; Ding, W. X. // Review of Scientific Instruments;2014, Vol. 85 Issue 11, p1 

    A high-performance Faraday-effect polarimeter-interferometer system has been developed for the J-TEXT tokamak. This system has time response up to 1 µs, phase resolution < 0.1° and minimum spatial resolution > 15 mm. High resolution permits investigation of fast equilibrium dynamics as...

  • Recent developments of the JET far-infrared interferometer-polarimeter diagnostic. Boboc, A.; Gelfusa, M.; Murari, A.; Gaudio, P.; JET-EFDA Contributors // Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D538 

    The far-infrared diagnostic provides essential internal measurements of the plasma density and magnetic field topology (q-profile via Faraday rotation angle) in real-time. The diagnostic capabilities have recently been extended in a number of key areas. Fast interferometer data, with 10 μs...

  • 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.

  • Midplane Faraday rotation: A tokamak densitometer. Jobes, F.C. // Review of Scientific Instruments;Jan1995, Vol. 66 Issue 1, p386 

    Determines the density in a tokamak by measuring the Faraday rotation effect of a laser directed tangent to the toroidal field. Parts comprising an elegant measurement system from a single laser beam diffracted off a moving grating to form a fan of ten probe beams.

  • 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...

  • 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...


Read the Article


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

Try another library?
Sign out of this library

Other Topics