NDLI: An S-band fluid-cooled helix TWT

Content Provider	IEEE Xplore Digital Library
Author	Arnett, H.D. Brown, H.E. Jensen Jr., J.T. Kyser, R.H. Peterson, P.I. Smith, S.T. Winslow, L.M.
Copyright Year	1972
Description	Author affiliation: Naval Research Laboratory, Washington, D. C. (Arnett, H.D.)
Abstract	The use of moving fluids in a hollow helix structure supported by hollow ceramics is shown to simultaneously provide helix cooling, selective losses for suppressing backward wave oscillations, and low dielectric loading. The same structure using a different fluid is a high-power attenuator. The 50 PSI input fluid passes through parallel hollow ceramic supports into and through a half-turn of the hollow helix and then out through other ceramic supports on the opposite side of the helix to the fluid output. The effect of the fluid in the helix is to provide excellent cooling (1500 watts/inch at 20°C rise in the fluid) with a large safety factor. The RF losses of the fluid in the ceramics are dependent upon the wall thickness of the ceramic and the electrical conductivity of the fluid. Using water as the coolant in a specific design provides a highly frequency-selective loss which prevents backward-wave oscillations. A slight modification of ceramic inner dimension and utilization of a higher conductivity fluid provides an attenuator capable of dissipating over 5 kilowatts.
Starting Page	184
Ending Page	184
File Size	85320
Page Count	1
File Format	PDF
DOI	10.1109/IEDM.1972.249212
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1972-12-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ceramics Laboratories Cooling Dielectric losses Attenuators Radio frequency Conductivity Circuits Electron tubes Safety
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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