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Effects of high plasma density on the electromagnetic properties of slow wave circuits

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6 Author(s)
Kobayashi, S. ; Inst. for Plasma Res., Maryland Univ., College Park, MD, USA ; Shkvarunets, A. ; Carmel, Y. ; Rodgers, J.
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Summary form only given, as follows. The presence of background plasma in a slow wave circuit can change its electromagnetic properties and affect the interaction of an electron beam with the circuit. In particular, loading of a slow wave structure with a radially nonuniform background plasma of high density (/spl omega//sub plasma//spl ges//spl omega//sub radiation/) can dramatically change the nature of the waves in the structure, leading to the formation of hybrid modes. These modes are hybrids of the plasma and the empty structure modes, with no analog in an evacuated system. Two C-band coupled cavity TWT (CCTWT) circuits and an X-band corrugated wall cavity were studied over a wide plasma density range. The radial profile and the absolute density of the background plasma were measured using a combination of a newly developed Langmuir-like probe and a small resonant cavity that measured the frequency shifts due to the plasma. For the corrugated cavity, resonant frequencies of both the TM/sub 01/ and TM/sub 02/ modes were measured over the density range 10/sup 10/

Published in:

Plasma Science, 1999. ICOPS '99. IEEE Conference Record - Abstracts. 1999 IEEE International Conference on

Date of Conference:

24-24 June 1999

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