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Articles you may be interested inA 70 kV solid-state high voltage pulse generator based on saturable pulse transformer Rev. Sci. Instrum. 85, 024708 (2014); 10.1063/1.4864194 Completely explosive ultracompact high-voltage nanosecond pulse-generating system Rev. Sci. Instrum. 77, 043904 (2006); 10.1063/1.2168674 High-voltage pulse switching hardware for electro-optic studies of conducting aqueous solutions Rev. Sci. Instrum. 73, 3080 (2002);
The Dragon-I injector based on the induction voltage adder technique is introduced. Twelve ferrite loaded induction cells are connected in a series through central conducting stalks to achieve a pulsed voltage higher than 3.5 MV across the diode. Electrons are extracted from the velvet emitter and guided through the anode pipe by the magnets placed inside the cathode and anode shrouds. Measurements at the exit of injector show that, with an electric field of 200 kV=cm near the velvet surface and suitable magnetic field distribution, an electron beam up to 2.8 kA can be obtained with a normalized emittance of 1040 mm mrad, and energy spread of 2.1% (3) around the central energy of 3.5 MeV.
Vacuum surface flashover of the high gradient insulator (HGI), which consists of many alternative layers of conductors and insulators, was found to generally start from one or several dielectric layers adjacent to the anode under nanosecond pulse by using the fast photography. A simple model is proposed to explain the experimental observations. The secondary electron emission avalanche (SEEA) along the dielectric surface adjacent to the anode will be greatly enhanced due to the upstream SEEA starting from the traditional and the intermediate cathode triple junctions. The 15-mm-thick HGI samples with different numbers of dielectric layers were tested and the samples with six and eight dielectric layers showed the best performance. The experimental result proves that as the number of dielectric layers reaches a certain level, the performance of the HGI will decrease as the number of dielectric layers increases.Index Terms-Fast photography, high gradient insulator (HGI), insulator, nanosecond pulse, surface flashover, vacuum.
Pulsed power research for military and civil applications has been conducted at the China Academy of Engineering Physics (CAEP) for more than 50 years. The pulsed power research activities include development of pulsed power components, such as different kinds of high-voltage switches, series of pulsed power sources and pulsed X-ray machines, highcurrent accelerators for Z-pinch and flash X-ray radiography, as well as medical application and electromagnetic launch. The most recent progress of pulsed power research at CAEP will be presented.
We recently set up a time-resolved optical beam diagnostic system. Using this system, we measured the high current electron beam energy in the accelerator under construction. This paper introduces the principle of the diagnostic system, describes the setup, and shows the results. A bending beam line was designed using an existing magnetic analyzer with a 300 mm-bending radius and a 60° bending angle at hard-edge approximation. Calculations show that the magnitude of the beam energy is about 18 MeV, and the energy spread is within 2%. Our results agree well with the initial estimates deduced from the diode voltage approach.
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