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The research of particle beam fusion and its related problems at The Institute of Atomic Energy in Beijing is evolving along the following five directions: 1. Pulsed power technology. An 80 GW intense electron beam accelerator has been built. Switch research is ongoing. 2. Diode research. The experimental research and theoretical simulation of electron pinch in the diode have been carried out. The pinch process has been investigated by measuring the area collapsing velocity of the pinching electron ring on the anode surface. Expanding velocities of the cathode and anode plasmas have been observed. The diode with large area cathode of 38 × 5 cm2 can produce a 46 kA electron beam current with a beam cross-section of 36 × 4 cm2 and good uniformity for pumping of a KrF laser. 3. Energy deposition of the electron beam on the targets has been studied by means of measurements of the intensity of soft X-rays, the energy spectrum of blow-off ions, the visible light spectra and the rear surface velocity of the target. These experiments show that the results are in agreement with the classical interaction mechanism for high Z targets, but it is several times higher than the classical result for low Z targets. 4. Electron beam propagation in neutral gases with various pressures space-and current-neutralization processes have been investigated. 5. The production of a KrF laser pumped by an electron beam. A laser beam with an energy of 13 J and pulse duration of 70 ns has been obtained.
A ∼500 kV/400 kA/100 ns pulsed power generator (PPG-I) for
x-pinch experiments was designed and constructed at Tsinghua University.
It is composed of a Marx generator, a combined pulse forming line (PFL), a
gas-filled V/N field distortion switch, a transfer line, and a
copper-sulphate resistive load for testing. The PPG-I implements a novel
design in lines that four pieces of waterline with impedance 5Ω in
parallel constitute a combined PFL with 1.25Ω, and incorporate each
other by a common self-break V/N switch on a matched 1.25Ω
transfer line. At the peak charging voltage of the PFL, the V/N switch
breaks down in multi-channel discharge mode, and electric energy is fed
into the testing load through the 1.25Ω transfer line. This article
presents the design and test of the PPG-I generator.
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