Suppression of parasitic space-charge oscillations in a gyrotron

We study the influence of nonuniform electric and magnetic fields in the helical-beam compression region on the low-frequency parasitic space-charge oscillations for a moderate-power ( 100 kW) 4-mm gyrotron. Suppression of the oscillations is achieved by optimization of both the cathode-unit geometr...

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Bibliographic Details
Published in:Radiophysics and quantum electronics 2006-10, Vol.49 (10), p.793-798
Main Authors: Louksha, O I, Piosczyk, B, Sominski, G G, Thumm, M, Samsonov, D B
Format: Article
Language:English
Subjects:
Compressing
Cyclotron resonance devices
Emission
Emitters
Gyrotrons
Holes
Magnetic fields
Optimization
Oscillations
Quantum electronics
Variability
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Summary:We study the influence of nonuniform electric and magnetic fields in the helical-beam compression region on the low-frequency parasitic space-charge oscillations for a moderate-power ( 100 kW) 4-mm gyrotron. Suppression of the oscillations is achieved by optimization of both the cathode-unit geometry in the magnetron-injector gun and the magnetic-field distribution in the region near the cavity input. The obtained data are evidence of possible effective operation of the gyrotron at elevated pitch-factor values α > 1.5 even for emitters with no highest emission uniformity ([delta]j^sub e^ [asymptotically =] 30%).[PUBLICATION ABSTRACT]
ISSN:0033-8443
1573-9120
DOI:10.1007/s11141-006-0114-1