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High Heat Flux Testing of Doped and Coated Graphite Using High-Intensity Pulsed Ion Beam

100%
Zhu X., Liu C., Lei M.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 6
1177-1179
EN
A high-intensity pulsed ion beam (HIPIB) technique is applied to heat flux testing of plasma facing materials for fusion experiment. The HIPIB is generated at a relatively stable power density up to 10^{8} W/cm^{2}, which covers a heat flux parameter of up to several hundreds MW m^{-2} s^{1/2}. Surface morphology and weight loss are examined for doped and coated graphite with HIPIB exposure of 280 MW m^{-2} s^{1/2}, being of the same order of thermal loads during off-normal events in future fusion reactors. The work demonstrates a first example utilizing the HIPIB technique to study thermal response of plasma facing materials under fusion relevant thermal loads.
2
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Study of Complex Cathode Emission Characters

100%
Zhang Y., Song F., Xiang F.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 6
1194-1196
EN
Based on the study of explosive emission, the dielectric enhanced electric-field emission model is brought forward, and the metal-dielectric complex cathode material is manufactured. Based on the investigation of surface-flashover explosive emission, the graphite-carbon fiber complex cathode is manufactured, too. Then the experiments are developed respectively, and the results show the electron emission density of these two complex cathode materials is also more than 17 kA/cm^{2}, and their lifetime is exceeding 10^{5} pulses.
3
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A Compact High Current Vacuum Diode Based on a Ceramic-Metal Welding Interface

100%
Xun T., Zhang J., Yang H., Wang Y., Liu Z.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
1013-1015
EN
For one kind of high current diodes composed of a ceramic-metal welding vacuum interface, the electrical design was presented. For compactness, a radial type insulator and a cone-column anode crust were adopted. The shielding methods around cathode and anode region were applied to mitigate the influence of welding solder to vacuum flashover. Finite Element Analysis (FEA) simulation results indicated that by adjusting the anode outline and shielding shape, the electric fields along the ceramic were well distributed. High voltage test was conducted on a long-pulse accelerator and experimental results confirm the theoretic design: the diode can stably hold on 400 kV and 200 ns voltage pulse.
4
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Advances in High Intensity e-Beam Diode Development for Flash X-Ray Radiography

88%
Oliver B., Hahn K., Johnston M., Portillo S.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 6
1044-1046
EN
Recent experiments at Sandia National Laboratories have demonstrated an electron beam diode X-ray source capable of producing >350 rad at one meter with 1.7 mm FWHM X-ray source distribution, with a 50 ns pulse-width and X-ray photon endpoint energy spectrum in the 6-7 MeV range. The diode operates at current densities of ≈1 MA/cm^{2}. The intense electron beam rapidly ( ≈ 5 ns) heats the X-ray conversion anode/target, liberating material in the form of low density ion emission early in the pulse and high density plasma later. This environment gives rise to beam/plasma collective effects which dominate the diode and beam characteristics, affecting the radiation properties (dose and spot-size). A review of the diode operation, the measured source characteristics and the simulation methods and diagnostics used to guide its optimization is given.
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