NDLI: Double-ended hydrogen thyratrons for crowbar protection of high-power TWT systems

Content Provider	IEEE Xplore Digital Library
Author	Nicholls, N.S. Menown, H. Wheldon, R.J.
Copyright Year	1963
Abstract	The doubt-ended multigap ceramic thyratron is a versatile switch for crowbar applications. It will provide protection over a very wide range of HT voltages and will operate within a submicrosecond time delay. Since the tube operates in a normal nondestructive "thyratron mode" it will fire reliably for many millions of shots. Practical crowbar conditions can be complex, in particular with floating-deck modulators where stray capacitance and inductance can cause the HT voltage to ring and sometimes completely reverse. In the event of voltage reversal, the double-ended thyratron conducts smoothly in the reverse direction as the circuit requires. The paper describes a new range of compact double-ended thyratrons specifically designed for crowbar use up to 100 kV with an auxiliary power consumption of only 75 W. A dynamic test arrangement is described which demonstrates the tube's capability of discharging 0.75µF charged to 60 kV, the current rising to 5000 A at a rate of 50 kA/µs, with an anode delay time of 200 ns. The test equipment simulates either grounded cathode or floating-deck operation under conditions where a flash arc fault occurs. The efficiency of the protection is evaluated by monitoring the "let-through current" (i), charge (it), and energy (i_{2}t). Coincidence counters register faulty operations. A compact auxiliary supply module makes these tubes especially attractive to aerospace systems engineers.
Sponsorship	IEEE Electron Devices Society
Starting Page	1456
Ending Page	1461
Page Count	6
File Size	972026
File Format	PDF
ISSN	00189383
Volume Number	26
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1979-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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