The correlation between the dynamic behaviour of a focused plasma and the bursts of neutrons, X-rays and charged particle beams have been investigated experimentally using a 65 kV plasma focus device. The dynamic bahaviour has been observed with a Mach-Zehnder interferometric system operating in the framing mode. The ion- and the electron beams are detected by a Thomson parabola analyzer and a Čerenkov detector, respectively. Neutrons, X-rays and charged particle beams are produced when a voltage spike appears. The generation of the electron- and the ion beam occur in an interval of 20 ns around the peak of the voltage spike. The m=0 type instabilities are observed even if the voltage spike does not appear. The plasma inductance increases monotonically but rather slowly during the process of the m=0 type instability growth. The neutron yield is ascribed to a generation of the anomalous resistivity in the plasma.
By using a suitable Bogolubov transformation between Fock bases in a Kerr manifold it is shown that a redefinition of the 'Unruh vacuum' is needed in order to obtain the thermal flux in the superradiant range.A new definition of a vacuum is proposed to obtain both the thermal flux and the non-thermal emission from a Kerr black hole.
We have proposed and demonstrated a novel non-contact electromagnetic deformable mirror actuator for spherical aberration compensation with simple configurations. The magnetic ring with low stiffness placed on a mirror deformed the mirror into an ideal parabolic shape by applying a magnetic force generated from an electromagnet underneath. We were able to control the deformation of the mirror by adjusting the applied voltage. The maximum deviation from ideal shape was less than 30 nm. In addition, a continuous change of the defocus aberration proportional to the 1.5-RMS /m deformation of the mirror was achieved. #
A compact Bragg spectrometer for monochromatic imaging in the soft x-ray region was designed and examined. With this spectrometer, a pinhole image is simultaneously recorded with a monochromatic image. This makes it possible to easily identify the wavelength when the location of the soft x-ray source fluctuates from shot to shot, such as in the plasma focus and Z-pinch plasma. An rubidium acid phtalate (RAP) flat crystal was examined and monochromatic images of the argon K lines around 4 Å were successfully obtained and displayed. The resolution power and dispersion obtained in situ were compared with the calculated values.
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