TY - JOUR
T1 - Cathode and anode optimization in a virtual cathode oscillator
AU - Chen, Y.
AU - Mankowski, J.
AU - Walter, J.
AU - Kristiansen, M.
AU - Gale, R.
N1 - Funding Information:
∗ This work was supported by FMV, Sweden.
PY - 2007/8
Y1 - 2007/8
N2 - We are fabricating and testing several different types of cathodes for the same vircator driven by a single shot Marx generator and pulse forming line (300 kV, 60 ns, 30 Ω). The cathodes types, each with an emitting area of ∼32 cm2, include the original velvet with a new geometry, carbon fiber, pin-array, and an array of all metal cathodes. The metal cathodes are made from aluminum and oxygen free copper fashioned to similar geometries with either a chemical etch or a CNC machining process. The vircator is tested with all of these cathodes using both polarity configurations and evaluated for beam voltage, current density, microwave output, and single shot lifetime. In addition to the cathode testing, several stainless steel and tungsten anode meshes with varying transparencies (50% - 80%) are evaluated. The construction and testing of an anode fashioned from Tantalum (70% transparency) is also discussed. Electron beam uniformity of the metal cathodes is investigated with the emitted electron beam current-density distribution evaluated in both time and space. Optimization of output power using resonant effects is also examined.
AB - We are fabricating and testing several different types of cathodes for the same vircator driven by a single shot Marx generator and pulse forming line (300 kV, 60 ns, 30 Ω). The cathodes types, each with an emitting area of ∼32 cm2, include the original velvet with a new geometry, carbon fiber, pin-array, and an array of all metal cathodes. The metal cathodes are made from aluminum and oxygen free copper fashioned to similar geometries with either a chemical etch or a CNC machining process. The vircator is tested with all of these cathodes using both polarity configurations and evaluated for beam voltage, current density, microwave output, and single shot lifetime. In addition to the cathode testing, several stainless steel and tungsten anode meshes with varying transparencies (50% - 80%) are evaluated. The construction and testing of an anode fashioned from Tantalum (70% transparency) is also discussed. Electron beam uniformity of the metal cathodes is investigated with the emitted electron beam current-density distribution evaluated in both time and space. Optimization of output power using resonant effects is also examined.
KW - All metal cathode
KW - Carbon fiber
KW - Electron beam uniformity
KW - HPM
KW - Marx generator
KW - Pin array
KW - Resonant effects
KW - Transparency
KW - Virtual cathode oscillator
UR - http://www.scopus.com/inward/record.url?scp=34547726665&partnerID=8YFLogxK
U2 - 10.1109/TDEI.2007.4286545
DO - 10.1109/TDEI.2007.4286545
M3 - Article
AN - SCOPUS:34547726665
VL - 14
SP - 1037
EP - 1044
JO - IEEE Transactions on Dielectrics and Electrical Insulation
JF - IEEE Transactions on Dielectrics and Electrical Insulation
SN - 1070-9878
IS - 4
ER -