Studies in Fusion Reactor Technology. Progress Report,September 1, 1974--May 30, 1975.

摘要

An H exp +ion accelerator for use in materials damage studies and radiolysis experiments has been placed into operation and tested from 5to 40kV. A target assembly for the accelerator has been designed and partially fabricated; a gas permeation apparatus which will be integrated with the target,is ready for assembly. A reaction vessel for radiolysis studies of hydrogen gas production from water vapor has also been assembled and tested. A new type of thin (less than 2000 A of aluminum) window,which will permit passage of H exp +ions from the accelerator to the reaction vessel,has been fabricated and tested at differential pressures as high as 100torr. Thermal gas permeation studies indicate that at driving pressures between 10exp -4and 10exp -2torr and temperatures between 600-700exp 0 C,the permeation rate of hydrogen gas through stainless steel is proportional to the driving pressure. Previous studies (by others) at driving pressures greater than 0.1torr display a dependence on the square root of the pressure. Molybdenum and tungsten coatings were found on samples cut from the ST Tokamak's inner vacuum wall by means of scanning electron microscopy and energy-dispersive x-ray analysis.