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Many emerging applications for high power RF sources place a premium on electrical efficiency. For pulsed systems, much of the energy is lost in the rising and falling edges of the beam current. This paper presents the concept of a pulsed depressed collector and the resulting improvements in system efficiency.
Diversified Technologies Inc. (DTI) is developing a long-pulse modulator which meets the requirements of the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory and the European Spallation Source (ESS). The modulators will deliver pulses at up to 100 kV and 50 A with a pulse width of 3.5 ms and a droop much less than 1%. The modulator will be delivered to SNS for conditioning klystron...
Under a U.S. Department of Energy grant, Diversified Technologies, Inc. (DTI) is developing a short pulse, solid-state Marx modulator (Figure 1). The modulator is designed for high efficiency in the 100 kV to 500 kV range, for currents up to 500 A, pulse lengths of 0.2 to 5.0 μs, and risetimes <300 ns. Key objectives of the development effort are modularity and scalablity, combined with low cost...
Diversified Technologies, Inc. (DTI) has bench-tested a table-top scale “Buck Matrix” modulator with an efficiency of ∼96% which uses a single set of IGBT switches for voltage regulation, arc protection, and pulse modulation.
The realization of millimeter wave klystrons is limited by cavity dimensions. High order mode cavities permit larger dimensions for a same frequency, but their low Q and R/Q are not adequate for klystron realization. A new topology of klystron is proposed to effectively support high order mode cavities at millimeter waves.
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