ICRF antenna designs and relative performances on TFTR

Hosea, J. C.; Bonanos, P.; Colestock, P. L.; Greene, G. J.; Medley, S. S.; Phillips, C. K.; Stevens, J.; Wilson, J.; Hoffman, D. J.; Sain, D. W.

doi:10.1063/1.38502

Cited by 4 publications

(1 citation statement)

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“…The design is an evolution of the Bay M ICRF antenna that has operated at 5 MW into the plasma. 2, 3 The antenna utilizes a center mounted spline drive mechanism for positioning the device with respect to the plasma edge and for resisting the forces generated during disruptions. The antenna consists of an RF cavity with slots at the front end (facing the plasma).…”

Section: Introductionmentioning

confidence: 99%

Design of ICRF antennas for TFTR

Raftopoulos

Scillia

Bonanos

et al.

[Proceedings] the 14th IEEE/NPSS Symposium Fusion Engineering

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Two 4 MW ICRF antennas have been designed for the Tokamak Fusion Test Reactor (TFTR). The antennas will be installed adjacent to the two existing antennas, bringing the maximum ICRF heating capacity to 12.5 MW. The design goals were as follows:Increase the loading to the plasma; reduce the tendency for arcing; and simplify the fabrication and assembly of the device. The design is an evolution of the Bay M ICRF antenna that has operated at 5 MW into the plasma. 2, 3

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Section: Introductionmentioning

confidence: 99%

Design of ICRF antennas for TFTR

Raftopoulos

Scillia

Bonanos

et al.

[Proceedings] the 14th IEEE/NPSS Symposium Fusion Engineering

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Electrical design and test of ICRF antenna for JT-60U

Saigusa

Fujii

Kimura

et al. 1994

Fusion Engineering and Design

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High harmonic fast wave heating efficiency enhancement and current drive at longer wavelength on the National Spherical Torus Experiment

Hosea¹,

Bell²,

LeBlanc³

et al. 2008

Physics of Plasmas

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108

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High harmonic fast wave heating and current drive (CD) are being developed on the National Spherical Torus Experiment [M. Ono et al., Nucl. Fusion 41, 1435 (2001)] for supporting startup and sustainment of the spherical torus plasma. Considerable enhancement of the core heating efficiency (η) from 44% to 65% has been obtained for CD phasing of the antenna (strap-to-strap ϕ=−90°, kϕ=−8m−1) by increasing the magnetic field from 4.5to5.5kG. This increase in efficiency is strongly correlated to moving the location of the onset density for perpendicular fast wave propagation (nonset∝B×k∥2∕ω) away from the antenna face and wall, and hence reducing the propagating surface wave fields. Radio frequency (RF) waves propagating close to the wall at lower B and k∥ can enhance power losses from both the parametric decay instability (PDI) and wave dissipation in sheaths and structures around the machine. The improved efficiency found here is attributed to a reduction in the latter, as PDI losses are little changed at the higher magnetic field. Under these conditions of higher coupling efficiency, initial measurements of localized CD effects have been made and compared with advanced RF code simulations.

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ICRF antenna designs and relative performances on TFTR

Cited by 4 publications

References 0 publications

Design of ICRF antennas for TFTR

Design of ICRF antennas for TFTR

Electrical design and test of ICRF antenna for JT-60U

High harmonic fast wave heating efficiency enhancement and current drive at longer wavelength on the National Spherical Torus Experiment

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