TY - JOUR
T1 - A Long Cavity with Reduced Diffraction Q for Subterahertz and Terahertz Gyrotrons
AU - Moshe, Roey Ben
AU - Bratman, V. L.
AU - Einat, Moshe
N1 - Publisher Copyright:
© 1973-2012 IEEE.
PY - 2015/8/1
Y1 - 2015/8/1
N2 - A promising modification of the gyrotron cavity with a little bit wider and fairly long insertion (drift section) into the regular cylindrical part has been studied, both analytically and numerically, by means of both solution of the well-known nonuniform string equation and direct solution of Maxwell equations based on the CST Microwave Studio code. It has been shown that relatively low ohmic losses and an axial field structure that is favorable for the achievement of a high gyrotron efficiency can, in principle, be provided in such a sectioned cavity in the cases of transparent and strongly reflecting drift sections. The decrease in ohmic losses is stronger for the second case because of the smaller amplitude of the wave with a high group velocity in the drift section, but the separation between the operating mode and the closest spurious axial mode is larger for the first case.
AB - A promising modification of the gyrotron cavity with a little bit wider and fairly long insertion (drift section) into the regular cylindrical part has been studied, both analytically and numerically, by means of both solution of the well-known nonuniform string equation and direct solution of Maxwell equations based on the CST Microwave Studio code. It has been shown that relatively low ohmic losses and an axial field structure that is favorable for the achievement of a high gyrotron efficiency can, in principle, be provided in such a sectioned cavity in the cases of transparent and strongly reflecting drift sections. The decrease in ohmic losses is stronger for the second case because of the smaller amplitude of the wave with a high group velocity in the drift section, but the separation between the operating mode and the closest spurious axial mode is larger for the first case.
UR - http://www.scopus.com/inward/record.url?scp=84939422367&partnerID=8YFLogxK
U2 - 10.1109/TPS.2015.2441833
DO - 10.1109/TPS.2015.2441833
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AN - SCOPUS:84939422367
SN - 0093-3813
VL - 43
SP - 2598
EP - 2606
JO - IEEE Transactions on Plasma Science
JF - IEEE Transactions on Plasma Science
IS - 8
M1 - 7182444
ER -