Faraday rotation measurements on compact helical system by using a phase sensitive heterodyne polarimeter

K. Tanaka; K. Kawahata; A. Ejiri; J. Howard; S. Okajima

doi:10.1063/1.1149314

Faraday rotation measurements on compact helical system by using a phase sensitive heterodyne polarimeter

K. Tanaka^*, K. Kawahata, A. Ejiri, J. Howard, S. Okajima

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

A phase sensitive heterodyne polarimeter was installed on compact helical system (CHS). An HCN laser (337 μm) and Schottky barrier diodes are used for the radiation source and for detection, respectively. By using a phase sensitive heterodyne scheme, the Faraday rotation angle can be measured from the phase variations caused by the phase difference between the right- and left-handed waves in the magnetized plasma. The purpose of the polarimeter on CHS is for a stable density monitor which is free from fringe jump and for the measurements of the internal magnetic field induced by the plasma current. The present resolution of the Faraday rotation angle is 0.1° with 10 ms time resolution and 1° with 1 ms. These are mainly determined by the laser instability.

Original language	English
Pages (from-to)	730-733
Number of pages	4
Journal	Review of Scientific Instruments
Volume	70
Issue number	1 II
DOIs	https://doi.org/10.1063/1.1149314
Publication status	Published - Jan 1999

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title = "Faraday rotation measurements on compact helical system by using a phase sensitive heterodyne polarimeter",

abstract = "A phase sensitive heterodyne polarimeter was installed on compact helical system (CHS). An HCN laser (337 μm) and Schottky barrier diodes are used for the radiation source and for detection, respectively. By using a phase sensitive heterodyne scheme, the Faraday rotation angle can be measured from the phase variations caused by the phase difference between the right- and left-handed waves in the magnetized plasma. The purpose of the polarimeter on CHS is for a stable density monitor which is free from fringe jump and for the measurements of the internal magnetic field induced by the plasma current. The present resolution of the Faraday rotation angle is 0.1° with 10 ms time resolution and 1° with 1 ms. These are mainly determined by the laser instability.",

author = "K. Tanaka and K. Kawahata and A. Ejiri and J. Howard and S. Okajima",

year = "1999",

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doi = "10.1063/1.1149314",

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T1 - Faraday rotation measurements on compact helical system by using a phase sensitive heterodyne polarimeter

AU - Tanaka, K.

AU - Kawahata, K.

AU - Ejiri, A.

AU - Howard, J.

AU - Okajima, S.

PY - 1999/1

Y1 - 1999/1

N2 - A phase sensitive heterodyne polarimeter was installed on compact helical system (CHS). An HCN laser (337 μm) and Schottky barrier diodes are used for the radiation source and for detection, respectively. By using a phase sensitive heterodyne scheme, the Faraday rotation angle can be measured from the phase variations caused by the phase difference between the right- and left-handed waves in the magnetized plasma. The purpose of the polarimeter on CHS is for a stable density monitor which is free from fringe jump and for the measurements of the internal magnetic field induced by the plasma current. The present resolution of the Faraday rotation angle is 0.1° with 10 ms time resolution and 1° with 1 ms. These are mainly determined by the laser instability.

AB - A phase sensitive heterodyne polarimeter was installed on compact helical system (CHS). An HCN laser (337 μm) and Schottky barrier diodes are used for the radiation source and for detection, respectively. By using a phase sensitive heterodyne scheme, the Faraday rotation angle can be measured from the phase variations caused by the phase difference between the right- and left-handed waves in the magnetized plasma. The purpose of the polarimeter on CHS is for a stable density monitor which is free from fringe jump and for the measurements of the internal magnetic field induced by the plasma current. The present resolution of the Faraday rotation angle is 0.1° with 10 ms time resolution and 1° with 1 ms. These are mainly determined by the laser instability.

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JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 1 II

ER -

Faraday rotation measurements on compact helical system by using a phase sensitive heterodyne polarimeter

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