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The following topics are dealt with:high power microwave devices; travelling wave tubes;field emission devices; gyro devices; submillimeter wave devices; microwave system for space applications; sheet beam devices; inductive output tube; klystrons; free electron lasers, magnetrons and novel devices; and electron guns, cathodes and materials.
Gyrotron oscillators (gyromonotrons) are mainly used as high power millimeter wave sources for electron cyclotron resonance heating (ECRH), current drive (ECCD), stability control and diagnostics of magnetically confined fusion plasmas. The maximum pulse length of commercially available 140 GHz, megawatt-class gyrotrons employing synthetic diamond output windows is 30 min (CPI and European FZK-CRPP-CEA-TED...
A new class of helical THz vacuum electron devices is under development using unconventional applications of microfabrication technology, modern computer modeling, and novel materials. The resulting slow wave circuits consist of a coil of gold wire, smaller in outside diameter than a human hair, supported by a thin diamond sheet and suspended within a diamond box. This configuration will extend the...
CERN operates a large number of vacuum electronics based RF power amplifiers covering a wide frequency range - over 300 sockets with 24 different grid tubes and klystrons are in use and require constant care to insure reliable operation of the accelerators. This is in particular true for the LHC and its injector chain, for which a program of improvement and stepwise upgrade has started. These include...
Many types of Multi-Beam Klystrons (MBKs) with frequency range from L to Ku band, power level of several hundred watts to several hundred kilo-watts, have been developed in China during last 17 years. The research work on both special technology and tubes will be described in this paper. The technical problems of the MBKs are also discussed.
This paper presents space applications of the TWT from the point of view of the German Space Agency. Technical aspects like high reliability, high efficiency, low mass and long lifetime play an important role as well as space typical factors like small number of pieces qualified designs and short delivery. Typical applications of the different Satellite Services (BSS, FSS, MSS, Data Relay and Navigation)...
A new innovative application of vacuum microwave electronics is suggested. Vacuum Microwave Integrated Circuits (VMIC) is suggested for design of radar front-end with high resistance against radioactivity and high power electromagnetic signals. We describe general approach to design of the VMIC suggested and give preliminary results of its possible implementation and future applications.
The authors talk about the last achievements with designing the cyclotron protective device (CPD) having a recovery time not more then 20 to 30 ns. The combination of CPD with low noise amplifier (LNA) is named as cyclotron protected complex amplifier (CPCA). It is concluded that increasing the frequency band of 3 cm wavelength CPD in twice is very important stage of development for present-day radar...
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