Abstract
The paper describes the production of metal-ceramic high-current emitters containing lanthanum hexaboride LaB6 by self-propagating high-temperature synthesis. Tests of emitters as explosive-emission cathodes in an OMEGA-350 microsecond accelerator are presented. Experiments show that when a metal-ceramic cathode is used, the emitted energy was 12-17% higher than that produced by tungsten and graphite cathodes and the beam “signature” is a circle with a small (∼ 15%) variation in radius.
Highlights
Accelerators of particle occupy a very important place in the industry
The cathodes are produced by self-propagating high-temperature synthesis [4]
After the combustion front has passed over the surface, a secondary heat explosion reaction begins inside the sample
Summary
Accelerators of particle occupy a very important place in the industry. The most important element of devices generating flows of charged particles is cathode [1]. Cathodes made from lanthanum hexaboride (LaB6) are widely used in accelerators to generate high-current electron beams in stationary and quasi-stationary modes. We present results of the synthesis of high-current emitters for explosion-emission cathodes containing LaB6. The cathodes are produced by self-propagating high-temperature synthesis [4]. The explosive reaction is initiated at the edges of the pellet by heating them in a quartz tube furnace in air. Temperature diagrams generated by thermocouples placed on the sides and upper edges show that the process begins as surface combustion. After the combustion front has passed over the surface, a secondary heat explosion reaction begins inside the sample. The surface combustion acts as a “chemical furnace” that heats the center of the pellet.
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