A mechanically tunable magnetron injection gun
作者:
Ch. Wang,
Y. S. Yeh,
T. T. Yang,
H. Y. Chen,
S. H. Chen,
Y. C. Tsai,
L. R. Barnett,
K. R. Chu,
期刊:
Review of Scientific Instruments
(AIP Available online 1997)
卷期:
Volume 68,
issue 8
页码: 3031-3035
ISSN:0034-6748
年代: 1997
DOI:10.1063/1.1148237
出版商: AIP
数据来源: AIP
摘要:
The magnetron injection gun (MIG) has been the predominant choice as the electron-beam generator in gyrodevices and it can be tuned by externally installed magnetic-field trim coils. The double-anode MIG, traditionally employed in most experiments, has the intermediate anode as an internal tuning mechanism. The single-anode design, on the other hand, is simpler to construct but lacks an internal beam tuning mechanism. The current paper describes a method to allow mechanical tuning of the MIG. Since the tip of the cathode is located in the region of the highest electric-field gradient, its extension and retraction relative to the rest of the cathode assembly provide an effective means for local electric-field profile modification and, therefore, a tuning mechanism for the electron-beam property and quality. It is demonstrated, in computer simulations and experimental tests, that the tuning mechanism adds a useful degree of freedom to the single-anode MIG for beam optimization. This method may also be applied to the double-anode design. ©1997 American Institute of Physics.
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