Abstract
A divergent gas-puff Z pinch has been devised for the realization of an efficient soft x-ray point source. In this device, a divergent hollow annular gas puff is ejected outward from the surface of the inner electrode, and the plasma is compressed three-dimensionally to generate a soft x-ray point source. In the SHOTGUN III-U device at Nihon University, the power supply was enhanced, and experiments were conducted over a larger current range. The peak current at the charging voltage of −25 kV was −190 kA. Ar was used as the discharge gas. The self-contraction process of the plasma was investigated in detail using a gated camera. Near the peak current, local contraction occurred in front of the inner electrode. The contraction velocity of the plasma was 5.5 × 104 m/s. As the plasma contracted, the discharge current decreased. The energy input was analyzed by induction acceleration. The net input energy was found to be 750 J, which corresponded to 13.3% of the stored energy of the capacitor, 5630 J. The soft x-ray source was observed using a soft x-ray CCD camera. A point source was observed 7 mm in front of the inner electrode. The size of the source was 35 µm in the axial direction and 14 µm in the radial direction.
Highlights
The plasma focus was invented by Fillipov and Mather.1,2 The notable feature of this device is that the discharge is performed in a gasfilled state, and the plasma contracts as the gas collects and converges to a single point in front of the center electrode
Since the discharge starts with surface discharge of an insulator, the input energy is limited by deterioration of the insulator
To realize an efficient soft x-ray point source, a divergent gaspuff Z pinch has been devised that both exhibits convergence of the plasma focus and has the efficiency of a gas-puff Z pinch
Summary
The plasma focus was invented by Fillipov and Mather. The notable feature of this device is that the discharge is performed in a gasfilled state, and the plasma contracts as the gas collects and converges to a single point in front of the center electrode. Soft x-ray sources using a plasma focus have been investigated.. To realize an efficient soft x-ray point source, a divergent gaspuff Z pinch has been devised that both exhibits convergence of the plasma focus and has the efficiency of a gas-puff Z pinch. In initial experiments on the device, high-energy x-rays of about 200 keV were observed, and it became clear that electron acceleration had occurred.. The problem with the X pinch as a soft x-ray point source is that the spectra of the multiply charged ions in a high-temperature plasma and the hard x-rays due to the electron beam are mixed. The divergent gas-puff Z pinch can act as a soft x-ray point source with a limited spectrum. Scitation.org/journal/mre contraction process of the pinch plasma, and the net input energy to the pinch plasma was determined by analyzing the current waveform
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