Design and initial tests of a low voltage stacked stripline fast wave launcher in the Phaedrus-T tokamak

P. H. Probert; S. P. Oliva; G. R. Winz; D. J. Hoffman; J. B.O. Caughman; W. L. Gardner

doi:10.1088/0029-5515/36/4/I02

Design and initial tests of a low voltage stacked stripline fast wave launcher in the Phaedrus-T tokamak

P. H. Probert, S. P. Oliva, G. R. Winz, D. J. Hoffman, J. B.O. Caughman, W. L. Gardner

Fusion Technology

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Abstract

A new type of antenna for launching waves in the ion cyclotron frequency range in toroidal plasma devices has been developed and tested in the Phaedrus-T tokamak. This antenna, a stacked stripline (SSL), generates a radiofrequency (RF) magnetic field similar to that of a conventional strap antenna but develops voltages 2 orders of magnitude less, and can operate without a Faraday shield. In comparison tests with a conventional strap antenna at a power level of 60 kW, the RF induced density rise and the impurity production (as indicated by soft X ray and loop voltage increases) were reduced by a factor of 3. In addition, it was demonstrated that capacitive loading effects were reduced or eliminated in comparison with those observed on a conventional strap antenna operated without a Faraday shield, and in the operation of a pair of SSL antennas at 90° phase small current drive effects were observed.

Original language	English
Pages (from-to)	421-433
Number of pages	13
Journal	Nuclear Fusion
Volume	36
Issue number	4
DOIs	https://doi.org/10.1088/0029-5515/36/4/I02
State	Published - Apr 1996

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title = "Design and initial tests of a low voltage stacked stripline fast wave launcher in the Phaedrus-T tokamak",

abstract = "A new type of antenna for launching waves in the ion cyclotron frequency range in toroidal plasma devices has been developed and tested in the Phaedrus-T tokamak. This antenna, a stacked stripline (SSL), generates a radiofrequency (RF) magnetic field similar to that of a conventional strap antenna but develops voltages 2 orders of magnitude less, and can operate without a Faraday shield. In comparison tests with a conventional strap antenna at a power level of 60 kW, the RF induced density rise and the impurity production (as indicated by soft X ray and loop voltage increases) were reduced by a factor of 3. In addition, it was demonstrated that capacitive loading effects were reduced or eliminated in comparison with those observed on a conventional strap antenna operated without a Faraday shield, and in the operation of a pair of SSL antennas at 90° phase small current drive effects were observed.",

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AU - Probert, P. H.

AU - Oliva, S. P.

AU - Winz, G. R.

AU - Hoffman, D. J.

AU - Caughman, J. B.O.

AU - Gardner, W. L.

PY - 1996/4

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AB - A new type of antenna for launching waves in the ion cyclotron frequency range in toroidal plasma devices has been developed and tested in the Phaedrus-T tokamak. This antenna, a stacked stripline (SSL), generates a radiofrequency (RF) magnetic field similar to that of a conventional strap antenna but develops voltages 2 orders of magnitude less, and can operate without a Faraday shield. In comparison tests with a conventional strap antenna at a power level of 60 kW, the RF induced density rise and the impurity production (as indicated by soft X ray and loop voltage increases) were reduced by a factor of 3. In addition, it was demonstrated that capacitive loading effects were reduced or eliminated in comparison with those observed on a conventional strap antenna operated without a Faraday shield, and in the operation of a pair of SSL antennas at 90° phase small current drive effects were observed.

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Design and initial tests of a low voltage stacked stripline fast wave launcher in the Phaedrus-T tokamak

Abstract

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