The VEBA Relativistic Electron Accelerator.

摘要

The VEBA high-current, relativistic electron accelerator has been designed and constructed at NRL for application in the study of high power microwave sources. To meet the requirements of this study, the accelerator was designed for operation in either a short (60 nsec) or long (2.2 microsec) pulse mode. The pulse-forming network in the short-pulse mode is an unbalanced water Blumlein with an output impedance of 9.1 ohms. The Blumlein is pulse-charged by a 1.9 MV Marx generator which has a series capacitance of 26 nF. By transmission along a tapered coaxial line, the output pulse is transformed to 20 ohms and the voltage developed across the diode increased to 2 MV. The Blumlein and transformer sections are removed to convert to the long pulse mode, and the diode is attached directly to the oversized Marx tank. The direct coupling between the Marx and the Blumlein is then replaced by two, nested, water capacitors which are shunted by spiral inductors. This unit with the Marx forms a three-section, voltage-fed, Guillemin (type A), pulse-forming network with a characteristic impedance of 40 ohms and an output voltage of 1 MV.