Abstract: A process for producing an epitaxial and/or highly texturized grown film, free of foreign phases, of a high-T.sub.c -oxide superconductor on a substrate, in which an ablation process is triggered and maintained on a spender target by means of pulsed particles or a laser beams, and the thus developing small droplets are deposited on a heated substrate. The substrate is held at a temperature at which the droplets on impact wet the substrate and coagulate into a uniform smooth film.An apparatus for this process comprises an electron source which produces a pulsed electron beam with an electron energy of about 10 to 20 keV and a current density in the range of 10.sup.3 to 10.sup.4 A/cm.sup.2.
Type:
Grant
Filed:
September 15, 1989
Date of Patent:
July 2, 1991
Assignee:
Kernforschungszentrum Karlsrube GmbH
Inventors:
Christoph Schultheiss, Jochen Geerk, Hans Karow
Abstract: A bow includes a centrally arranged handle and a bow limb emanating from each end of the handle, with a cord being tensioned between the outer ends of the bow limbs. The inner ends of the bow limbs are shaped into forks whose tines (which act as springs) are fastened separately, each to a frontal face of the handle. The special configuration increases the energy stored in the bow and reduces the force required for tensioning the cord.