DTI successfully tested the first of three klystron modulators for the CLARA at Daresbury Laboratories, UK, on February 20, 2018. This high power modulator is designed to pulse 70 MW-class klystrons at an average beam power of 250 kW. Each system provides 450 kV, 545 A cathode pulses, with a 3.0 µs flattop better than ±0.02%. Installation of the first modulator in with its klystron is...
For laboratory-scale experiments on the treatment of biological material by pulsed electric fields an eight-stage Marx-type pulse generator has been developed and set up. Its stages comprise IGBT switches in full-bridge configuration for generating bipolar pulses. The generator is grounded at its center allowing for a ground-symmetric operation of a flow chamber for material treatment. The...
Nanocrystalline material has become one of the most efficient and prolific materials for use in high-frequency pulse transformers. Nanocrystalline cores successfully bridge the gap between laminated steel and ferrite with high saturation and low loss, however, the cost and quality of the material is variable. The manufacturing and quality control procedures of the material has a direct impact...
Numerical methods are frequently employed for high voltage designs. The results usually determine the size of parts with safety factors. Charge transport based numerical codes are sometimes implemented to better understand the high voltage design related to the breakdown performance, however such approaches require computationally expensive compared to straight forward electric field...
According to the preliminary study, the Laser Triggered Vacuum Switch (LTVS) might be an advanced high-voltage, high-intensity pulse switch. It will have the advantages of short trigger delay time and good isolation from the main circuit. The study of the trigger mechanism of LTVS is conducive to both the optimization and the miniaturization of it, and beneficial to promote its practical...
Rectangular high-voltage narrow pulses are preferred in most Dielectric barrier discharge (DBD) loads and corona discharges in water. Usually at least two groups of switches are required to generate rectangular pulses over capacitive loads. One group discharges the energy-storage capacitors to the load and the other group discharges the energy stored in the stray capacitor of the capacitive...
The AT-HVCM, achieved by series-stacking the dual-function resonant filter capacitors following each rectification stage, is the baseline design for the PPU project at the SNS. The project requires three AT-HVCM modulators to power 28 additional 700kW klystrons and associated high beta cavities in order to accelerate 38mA of beam current to 1.3GeV. Each modulator produces an 82 kV, 120A...
