Zobrazeno 1 - 10
of 49
pro vyhledávání: '"B. R. F. Kendall"'
Autor:
B. R. F. Kendall, E. Drubetsky
Publikováno v:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 18:1724-1729
Cold-cathode ionization gauges offer many advantages for routine high-vacuum measurements. They are simple and robust. Thermal outgassing and electron-stimulated desorption, both significant problems in hot-cathode gauges, are negligible. There are n
Autor:
B. R. F. Kendall
Publikováno v:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 17:2041-2049
Factors affecting the accuracy of ionization gauge measurements at low pressures are reviewed. In hot-cathode gauges these include electron-stimulated desorption at the electron collector, forward and reverse x-ray effects, the potential of the gauge
Autor:
E. Drubetsky, B. R. F. Kendall
Publikováno v:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 16:1163-1168
X-ray induced emission of electrons from the ion collectors of Bayard–Alpert gauges has long been recognized as a cause of falsely high readings at low pressures. Less well known is the existence of a reverse x-ray effect leading to a superimposed,
Autor:
E. Drubetsky, B. R. F. Kendall
Publikováno v:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 15:740-746
Nine cold cathode gauges have been evaluated on ion-pumped ultrahigh vacuum systems operating at pressures down to the 10−11 Torr range. The test gauges included magnetrons, inverted magnetrons, and double inverted magnetrons from four different ma
Autor:
E. E. Allison, B. R. F. Kendall
Publikováno v:
Review of Scientific Instruments. 67:3806-3812
An unconventional electrodynamic suspension system with transparent planar electrodes is described which stably levitates charged solid particles or liquid droplets without the need for feedback control. The system has been used with particles rangin
Autor:
B. R. F. Kendall, E. Drubetsky
Publikováno v:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 14:1292-1296
A cold‐cathode gauge does not immediately start when power is applied. Starting is generally assumed to be triggered by a cosmic ray or other energetic particle. The starting behaviors of two magnetron, two inverted magnetron, and five double inver
Autor:
B. R. F. Kendall, L. D. Hinkle
Publikováno v:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 10:243-247
A glass microbubble (diameter ∼15 μm, wall 0.65 μm) was levitated in high vacuum by an actively controlled electric field. While held vertically, the particle moved freely in the horizontal plane under the influence of a central restoring force.
Publikováno v:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 9:1996-2000
Two turbopumped vacuum systems were each equipped with connections for up to three residual gas analyzers (RGAs) of different types. One system allowed comparisons of two commercial quadrupole RGAs with a time‐of‐flight (TOF) instrument of roughl
Autor:
L. D. Hinkle, B. R. F. Kendall
Publikováno v:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 8:2802-2805
A novel method of levitation, using an actively controlled electric field, launches, captures, and stably suspends a microscopic (∼15 μm) particle in high vacuum. While held to within one diameter in the vertical direction, the particle is allowed
Autor:
J. L. Dobson, B. R. F. Kendall
Publikováno v:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 8:2790-2794
Pulse‐modulated electromagnetic on–off valves can be used to deliver repeatable gas flows up to the full flow capability of the valves. The mean gas flow is directly proportional to the pulse repetition rate and to the effective pulse width (open