NDLI: Determination of vacuum pumping characteristics for an evacuated ECH circular waveguide system

Content Provider	IEEE Xplore Digital Library
Author	Langley, R.A. Bigelow, T.S. Santeler, D.J.
Copyright Year	1993
Description	Author affiliation: Oak Ridge Nat. Lab., TN, USA (Langley, R.A.; Bigelow, T.S.)
Abstract	The Electron Cyclotron Heating (ECH) waveguide transmission line, which is used to launch microwave power into the Advanced Toroidal Facility (ATF) plasma confinement experiment, was studied to determine the need for pumping along its length. Several constraints are imposed on the system; the two main constraints are: (1) gas released to the plasma device and (2) the maximum pressure allowed in the waveguide before gas breakdown occurs. The computer program Vacuum System Design-II was used to model the various vacuum components of the existing systems and to determine the gas flow vs. pressure. In addition, outgassing and a constant leak were used to realistically model the gas flow characteristics of the complete system. Pumping must be accomplished via small perforations in the waveguide wall to minimize microwave leakage and maintain the mode purity of the waves. Because the diameter of the perforations must be smaller than the screen thickness to prevent microwave power loss, each perforation was modeled as a long tube. The conductance, of this screen was found to reduce (about 30%) the effectiveness of the pump. In addition, the waveguide presents a significant reduction in the system conductance thereby increasing the pressure difference between the pump and the end of the waveguide. Several cases were run using various waveguide lengths and component configurations. Results of these cases are presented and conclusions made.
Starting Page	1111
Ending Page	1114
File Size	323731
Page Count	4
File Format	PDF
ISBN	0780314123
DOI	10.1109/FUSION.1993.518518
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-10-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electromagnetic heating Vacuum systems Fluid flow Power system modeling Electrons Cyclotrons Heat pumps Power transmission lines Microwave devices Plasma confinement
Content Type	Text
Resource Type	Article

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