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Using avalanche transistors, a trigger unit capable of producing several kilovolts in 25 nanoseconds—total risetime—has been constructed. We have used such a circuit to drive a nitrogen laser, resulting in a substantial decrement of the delay time between trigger signal input and the...
A system of three square coils was studied with computational methods. Design data are given which allow one to optimize the field uniformity for both the radial and the axial components, within a given volume of the coil system. By use of these data, it is possible to get a field of a given...
A picosecond streak camera that can be used in variable repetitive mode in conjunction with a mode‐locked synchronously‐pumped or a cavity‐dumped dye laser has been developed, as well as an acquisition system which allows digitization and accumulation of the streak records. Time resolution...
A more reliable 40 kV, 65 A power supply drain at 0.4 A/cm 2 , neutral‐beam accelerator was developed for the Tandem Mirror Experiment (TMX). Multiple slotted aperture grids of 60% transparency are fabricated from refractory metal wires mounted to form a spherical surface. This geometrically...
A capacitive detector is described which displays high sensitivity and accuracy in the measurement of transients. The device has been used in an LC circuit for studies of third sound in thin helium films. When operated in a phase‐lock mode at 21 MHz its observed sensitivity is 15 Hz per...
We report on the use of a recently developed, very compact, totally portable x‐ray imaging device, the Lixiscope, for the purpose of real‐time observation of transmission Laue diffraction patterns. Such a device is also potentially useful in real‐time dynamic studies of structural changes.
A system to calibrate a stratospheric mass spectrometer experiment for ozone has been developed and evaluated. The stability of ozone and the formation of impurities within the calibration volume were measured. The half‐life of ozone is about 12 hours, its purity ranges from 95% to 99% and is...
A new implant technique, in which a single magnet carries out mass separation and ion beam scanning, is described. Dose uniformity and energy conversion efficiency of a solar cell fabricated using this technique are investigated.
An x‐ray diffractometer has been constructed so as to allow the study of cyrogenic fluids, in particular liquid helium, at temperatures below 4.2 K. The design and operating characteristics of the diffractometer are presented. Data acquisition is automatic. The x‐ray beam is almost...
An automated system for dark conductivity and Hall measurements and photoconductivity and photo‐Hall characterization of high resistivity semiconductors is described. This system has been applied to commercially available semi‐insulating GaAs substrates.
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