A high-voltage surface effect on dielectrics in vacuum

Abstract

Bright centres were observed on dielectric layers (100 mu m) in vacuum as a pre-breakdown phenomenon at high-voltage pulses. They are origins of Lichtenberg figures on the insulator surface. The properties of this phenomenon are described and explained by a qualitative model which accentuates the importance of the insulator surface charge.

Fusion-fission in the35Cl +12C reaction at Elab=180 MeV

“…1 The angle-integrated cross sections are shown in Fig. This behavior, also observed in heavier systems [1, 9,10], has been successfully reproduced either by the transition-state model for fission [9] or by Extended Hauser-Feshbach calculations [10]. The elemental distribution shows a typical asymmetrical shape as for a fusionfission process at low angular momenta below the Businaro-Gallone point [8], where the 47V compound system is not expected to evolve toward symmetric configurations.…”

A space-charge-neutralizing plasma for beam drift compression

“…It has been demonstrated that when a 300 keV, 25 mA K' beam passed through vacuum, the beam radius at the nominal 1 m focal distance was 14.7 mm at lo radius. The same beam, when passed through a plasma plug, a conjunction of two plasma jets, using two filtered cathodic arc sources (FCAPS) [15][16], exhibited a beam lo radius that decreased to -1.3 mm.…”