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As we know, before flashover across an insulator surface under high electric field in vacuum, there are charging phenomena occurring on the insulator surface, which significantly affect the developing process of flashover. Based on the secondary electron emission avalanche (SEEA) model, and by using the Monte Carlo method, a two-dimensional analysis of surface charge density on cylindrical and conical...
It is known that the hold-off voltages of vacuum gaps can be improved by the spark conditioning with repetitive electrical breakdowns. At the early stage of spark conditioning process, small pulse currents (not breakdowns) are sometimes observed, and in turn hold-off voltages were improved. To clarify the mechanism of the pulse current occurrence two experiments were carried out.
On the basis of successful development of Gyrotron FU CW II, a similar gyrotron FU CW IIA is being developed for both 600 MHz and 300 MHz DNP-NMR experiments at the University of Warwick in UK. The frequencies of the gyrotron are 394.6 GHz at the second harmonic and 200 GHz at fundamental that correspond to frequencies 600 MHz and 200 GHz DNP-NMR spectroscopy. The output powers are around 30 W and...
Energy spectra of X-rays emitted from the surface of the FRP insulator were measured for 3 different positions and compared with those of the vacuum gap between electrodes. Near the anode, the X-ray spectrum was dominated by the monoenergetic electrons. Near the cathode, the spectrum peak shifted to low energy compared with that near the anode. This result showed that a large amount of low energy...
Very tightly-focused ion beam was obtained by “Plasma Focus Diode” (PFD), yielding focusing diameter of ∼ 360 µm, and power density of ∼ 0.1 TW/cm2 at the beam energy of ∼ 1.5 MeV. Enhanced energy deposition was observed in the interaction with aluminium target with the enhancement ratio of ∼ 1.5. In comparison of the experimental data with 1-D hydrocode simulation, good agreement is obtained between...
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