Hybrid transmission lines for ECRH in the HSX stellarator

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A new transmission line has been designed for the planned upgrades for the 28GHz ECRH system on the HSX stellarator. In order to create a reliable and cost effective system, the new line utilizes quasioptical design techniques and oversized straight waveguide sections similar to those used in the existing transmission line. The first stage of the line converts the native TE 02 gyrotron output mode to a free space Gaussian beam. The two methods considered are a Vlasov mode converter and a TE02-to-TE 01-to-TE11-to-HE11 conversion sequence using waveguide mode converters retained from a previous ECRH system. A matching optics unit couples the beam to a smooth, circular 11 + TM 11 dual-mode waveguide sections for traversing the experimental hall, and a grooved polarizer rotates the beam polarization for O-mode or X-mode ECRH. Transmission line bends are implemented with ellipsoidal mirrors, with the final bend acting as a rotatable switch to select between HSX and a dummy load. A steerable mirror in boxport B allows independent selection of the heating surface in the plane of the boxport.

Original languageEnglish (US)
Title of host publicationProceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages471-476
Number of pages6
ISBN (Print)9812814639, 9789812814630
StatePublished - Jan 1 2009
Externally publishedYes
Event15th Joint Workshop on Electron Cyclotron Emission, ECE 2008 and Electron Cyclotron Heating, ECH 2008 - Yosemite Village, CA, United States
Duration: Mar 10 2008Mar 13 2008

Publication series

NameProceedings of the 15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC-15

Other

Other15th Joint Workshop on Electron Cyclotron Emission, ECE 2008 and Electron Cyclotron Heating, ECH 2008
Country/TerritoryUnited States
CityYosemite Village, CA
Period3/10/083/13/08

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