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Relative changes of inductance Δ L / L of a single layer coil surrounding a thin electrically conducting disk which can rotate about an axis perpendicular to the coil axis are studied experimentally as a means of measuring angular displacements. Δ L / L is found to be a strong function of disk...
The guiding of a 300 eV divergent hydrogen ion beam by a surface magnetic field generated by samarium cobalt magnets has been investigated. It was found that magnets arranged in a multi‐ring‐cusp configuration produced the best beam transport efficiency.
A Kaufman‐type broad beam ion source, used for sputtering and etching purposes, has been operated with Ar, Kr, O 2 and N 2 gas inputs over a wide range of beam energies (200–1200 eV) and gas flow rates (1–10 sccm). The maximum ion beam current density for each gas saturates at about 2.5...
The design and performance of a compact, high precision, capacitive, vapor‐pressure gauge is described. The gauge was constructed using a thin electrodeposited copper diaphragm.
A fast valve which can inject gas pulses with durations from 25 to 400 μs into a vacuum system is described. Quantities up to 5 Torr l can be injected. A pressure rise time of ∼0.5 Torr/μs has been determined at the valve opening. A fast opening time is achieved by having a magnetically...
A thyratron Pockels cell driver capable of optically switching Pockels cells of up to 2.5 cm aperture in 6 ns at repetition rates of up to 1000 Hz is described. The circuit is based on a modified HY‐2 thyratron.
With a hot plate and a spherical mirror, a highly efficient crucible heating furnace was theoretically calculated and constructed. The upper part of the crucible provides free access to the melt, as is needed in the Czochralski crystal growth technique. For the design, the heat radiation flow...
We describe a method for measuring heat capacity of small specimens in the 1.5–10 K range by means of thermal relaxation over that range. Our methods of calibration and analysis make use of the simple properties of the thermal link between specimen and its surroundings, and offer several...
The design, construction, operation, and performance of a spin polarized electron source utilizing photoemission from negative electron affinity (NEA) GaAs are presented in detail. A polarization of 43±2% is produced using NEA GaAs (100). The polarization can be easily modulated without...
A high pressure apparatus for determining PVT data of liquids and plastic crystals and volume changes which might accompany phase transitions is described. In the present investigation the PVT data of acetonitrile have been determined from +40° to −50 °C and up to 3000 bar, including the...
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