1-Millimeter wave interferometer for the measurement of line integral electron density on TFTR

P. C. Efthimion; G. Taylor; W. Ernst; M. Goldman; M. McCarthy; H. Anderson; N. C. Luhmann

doi:10.1063/1.1138038

1-Millimeter wave interferometer for the measurement of line integral electron density on TFTR

P. C. Efthimion
, G. Taylor
, W. Ernst
, M. Goldman
, M. McCarthy
, H. Anderson
, N. C. Luhmann

Plasma Physics Lab

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

15 Scopus citations

Abstract

A two-pass interferometer at 285 GHz has been developed to measure the line-integrated electron density on the horizontal midplane of the toroidal fusion test reactor (TFTR). Presently, the interferometer employs a 2-mW solid-state source to supply the launch wave and a 2-mm klystron oscillator and, a harmonic mixer to provide a superheterodyne front end. The transmission system consists of 25 m of C-band rectangular waveguide, adjustable miter bends, and a spherical mirror in the vacuum vessel with a total round trip transmission loss of 21 dB. The interferometer signal to noise is ≳50 dB. Utilization of a feed forward tracking system provides long-term stable operation. The interferometer routinely provides real-time feedback control for the gas injection system and a permissive for neutral beam operation.

Original language	English (US)
Pages (from-to)	908-910
Number of pages	3
Journal	Review of Scientific Instruments
Volume	56
Issue number	5
DOIs	https://doi.org/10.1063/1.1138038
State	Published - 1985

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.1138038

Cite this

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title = "1-Millimeter wave interferometer for the measurement of line integral electron density on TFTR",

abstract = "A two-pass interferometer at 285 GHz has been developed to measure the line-integrated electron density on the horizontal midplane of the toroidal fusion test reactor (TFTR). Presently, the interferometer employs a 2-mW solid-state source to supply the launch wave and a 2-mm klystron oscillator and, a harmonic mixer to provide a superheterodyne front end. The transmission system consists of 25 m of C-band rectangular waveguide, adjustable miter bends, and a spherical mirror in the vacuum vessel with a total round trip transmission loss of 21 dB. The interferometer signal to noise is ≳50 dB. Utilization of a feed forward tracking system provides long-term stable operation. The interferometer routinely provides real-time feedback control for the gas injection system and a permissive for neutral beam operation.",

author = "Efthimion, \{P. C.\} and G. Taylor and W. Ernst and M. Goldman and M. McCarthy and H. Anderson and Luhmann, \{N. C.\}",

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doi = "10.1063/1.1138038",

language = "English (US)",

volume = "56",

pages = "908--910",

journal = "Review of Scientific Instruments",

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publisher = "American Institute of Physics",

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TY - JOUR

T1 - 1-Millimeter wave interferometer for the measurement of line integral electron density on TFTR

AU - Efthimion, P. C.

AU - Taylor, G.

AU - Ernst, W.

AU - Goldman, M.

AU - McCarthy, M.

AU - Anderson, H.

AU - Luhmann, N. C.

PY - 1985

Y1 - 1985

N2 - A two-pass interferometer at 285 GHz has been developed to measure the line-integrated electron density on the horizontal midplane of the toroidal fusion test reactor (TFTR). Presently, the interferometer employs a 2-mW solid-state source to supply the launch wave and a 2-mm klystron oscillator and, a harmonic mixer to provide a superheterodyne front end. The transmission system consists of 25 m of C-band rectangular waveguide, adjustable miter bends, and a spherical mirror in the vacuum vessel with a total round trip transmission loss of 21 dB. The interferometer signal to noise is ≳50 dB. Utilization of a feed forward tracking system provides long-term stable operation. The interferometer routinely provides real-time feedback control for the gas injection system and a permissive for neutral beam operation.

AB - A two-pass interferometer at 285 GHz has been developed to measure the line-integrated electron density on the horizontal midplane of the toroidal fusion test reactor (TFTR). Presently, the interferometer employs a 2-mW solid-state source to supply the launch wave and a 2-mm klystron oscillator and, a harmonic mixer to provide a superheterodyne front end. The transmission system consists of 25 m of C-band rectangular waveguide, adjustable miter bends, and a spherical mirror in the vacuum vessel with a total round trip transmission loss of 21 dB. The interferometer signal to noise is ≳50 dB. Utilization of a feed forward tracking system provides long-term stable operation. The interferometer routinely provides real-time feedback control for the gas injection system and a permissive for neutral beam operation.

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JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 5

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1-Millimeter wave interferometer for the measurement of line integral electron density on TFTR

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