Influence of CD2 fiber on the compression in the PF-1000 facility

Abstract

The paper presents the results of observations of the visible radiation, x-rays and neutrons produced during the implosion of the plasma sheath upon the deuterated fiber placed at thez-axis. The discharges were carried out in the PF-1000 facility with current amplitudes ranging 2 MA. The plasma was detected with a PIN silicon detector, two soft x-ray detectors using microchannel plates, four frame cameras operating in the visible spectral range, a visible streak camera, a time-resolved optical spectrometer, three scintillation probes for time-resolved measurements of the hard x-ray and neutron emission in the downstream, upstream and side-on directions. The neutron yield was measured with five silver-activation counters. Experiments were carried out with the implosion of the hydrogen- or deuterium-plasma current-sheath upon the CD2 fiber. Considerable decrees of the soft and hard x-rays was observed in comparison to shots without fiber. The neutron yield was zero during the implosion of the hydrogen-plasma current-sheath and it was considerably decreased (by one order) during the implosion of the deuterium-plasma current-sheath. The temperature of ≈5 eV and the electron density of ≈1025 m−3 were evaluated from intensities of the CIII- and CIV-lines. These results were different from those obtained during the experiments with implosion of deuterium-plasma current sheath on the C fiber or Al wire, which were performed earlier. At the similar conditions the decrease of the x-rays and neutrons was not observed.