Abstract
1. A study was made of the possibility of employing cold lanthanum hexaboride cathodes in high-voltage GDD. It is shown that use of LaB6 instead of molybdenum cathodes reduces the pulse-induced voltage drop by a factor of 2–2.5. A particularly low and stable voltage drop is exhibited by devices with cathode units made entirely of LaB6. 2. The variation in structure and chemical composition occurring during operation in the cathode material was studied by the metallographic and electron microprobe methods. Ion bombardment was found to change the composition of the working surface of the cathode. 3. Use of lanthanum hexaboride in cold cathodes of GDD with crossed fields enables devices with substantially improved power characteristics to be obtained, approaching those of pulse hydrogen thyratrons with incandescent cathodes.
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