Hybrid transmission line for ECRH in the helically symmetric experiment

J. W. Radder; K. M. Likin; F. S.B. Anderson; D. T. Anderson

doi:10.1007/s10762-008-9333-1

Hybrid transmission line for ECRH in the helically symmetric experiment

J. W. Radder, K. M. Likin, F. S.B. Anderson, D. T. Anderson

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1 Scopus citations

Abstract

The HSX oversized, mode-converting ECRH transmission line has been upgraded to a hybrid system to increase launched microwave power and reduce electrical arcing. Filtering of high-order, spurious modes ensures efficient coupling to a Gaussian beam for optimal electron heating. A Vlasov mode converter and two phase-correcting ellipsoidal mirrors convert the TE₀₂ gyrotron output mode to a symmetric, linearly polarized, microwave beam. A swappable twist reflector plate rotates beam polarization for 2nd-harmonic X-mode or fundamental O-mode ECRH. Long distances are traversed by coupling the beam to a dual-mode (TE₁₁∈+∈TM₁₁), smooth, circular cross-section waveguide. This system has been successfully tested without arcing for 50 ms pulses and over 100 kW of launched power. Analysis of the microwave beam for 50 kW, 2 ms microwave pulses reveals agreement with predicted beam shapes at two beam locations. The new system has also demonstrated increased plasma stored energy for ECRH plasmas with equal launched power.

Original language	English (US)
Pages (from-to)	360-372
Number of pages	13
Journal	International Journal of Infrared and Millimeter Waves
Volume	29
Issue number	4
DOIs	https://doi.org/10.1007/s10762-008-9333-1
State	Published - Apr 2008
Externally published	Yes

Keywords

Electron cyclotron heating
Microwave transmission lines
Quasioptics
Stellarators

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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title = "Hybrid transmission line for ECRH in the helically symmetric experiment",

abstract = "The HSX oversized, mode-converting ECRH transmission line has been upgraded to a hybrid system to increase launched microwave power and reduce electrical arcing. Filtering of high-order, spurious modes ensures efficient coupling to a Gaussian beam for optimal electron heating. A Vlasov mode converter and two phase-correcting ellipsoidal mirrors convert the TE02 gyrotron output mode to a symmetric, linearly polarized, microwave beam. A swappable twist reflector plate rotates beam polarization for 2nd-harmonic X-mode or fundamental O-mode ECRH. Long distances are traversed by coupling the beam to a dual-mode (TE11∈+∈TM11), smooth, circular cross-section waveguide. This system has been successfully tested without arcing for 50 ms pulses and over 100 kW of launched power. Analysis of the microwave beam for 50 kW, 2 ms microwave pulses reveals agreement with predicted beam shapes at two beam locations. The new system has also demonstrated increased plasma stored energy for ECRH plasmas with equal launched power.",

keywords = "Electron cyclotron heating, Microwave transmission lines, Quasioptics, Stellarators",

author = "Radder, {J. W.} and Likin, {K. M.} and Anderson, {F. S.B.} and Anderson, {D. T.}",

year = "2008",

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AU - Radder, J. W.

AU - Likin, K. M.

AU - Anderson, F. S.B.

AU - Anderson, D. T.

PY - 2008/4

Y1 - 2008/4

N2 - The HSX oversized, mode-converting ECRH transmission line has been upgraded to a hybrid system to increase launched microwave power and reduce electrical arcing. Filtering of high-order, spurious modes ensures efficient coupling to a Gaussian beam for optimal electron heating. A Vlasov mode converter and two phase-correcting ellipsoidal mirrors convert the TE02 gyrotron output mode to a symmetric, linearly polarized, microwave beam. A swappable twist reflector plate rotates beam polarization for 2nd-harmonic X-mode or fundamental O-mode ECRH. Long distances are traversed by coupling the beam to a dual-mode (TE11∈+∈TM11), smooth, circular cross-section waveguide. This system has been successfully tested without arcing for 50 ms pulses and over 100 kW of launched power. Analysis of the microwave beam for 50 kW, 2 ms microwave pulses reveals agreement with predicted beam shapes at two beam locations. The new system has also demonstrated increased plasma stored energy for ECRH plasmas with equal launched power.

AB - The HSX oversized, mode-converting ECRH transmission line has been upgraded to a hybrid system to increase launched microwave power and reduce electrical arcing. Filtering of high-order, spurious modes ensures efficient coupling to a Gaussian beam for optimal electron heating. A Vlasov mode converter and two phase-correcting ellipsoidal mirrors convert the TE02 gyrotron output mode to a symmetric, linearly polarized, microwave beam. A swappable twist reflector plate rotates beam polarization for 2nd-harmonic X-mode or fundamental O-mode ECRH. Long distances are traversed by coupling the beam to a dual-mode (TE11∈+∈TM11), smooth, circular cross-section waveguide. This system has been successfully tested without arcing for 50 ms pulses and over 100 kW of launched power. Analysis of the microwave beam for 50 kW, 2 ms microwave pulses reveals agreement with predicted beam shapes at two beam locations. The new system has also demonstrated increased plasma stored energy for ECRH plasmas with equal launched power.

KW - Electron cyclotron heating

KW - Microwave transmission lines

KW - Quasioptics

KW - Stellarators

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ER -

Hybrid transmission line for ECRH in the helically symmetric experiment

Abstract

Keywords

UN SDGs

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