Institution
Varian Associates
About: Varian Associates is a based out in . It is known for research contribution in the topics: Beam (structure) & Amplifier. The organization has 2160 authors who have published 2591 publications receiving 46002 citations.
Topics: Beam (structure), Amplifier, Wafer, Cathode, Resonance
Papers published on a yearly basis
Papers
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14 Aug 1981TL;DR: In this paper, an electron bombardment ion source of the Freeman type incorporates an electrode having multiple segments which are electrically connected in parallel to provide increased surface area for constant cross-section.
Abstract: An electron bombardment ion source of the Freeman type incorporates an electrode having multiple segments which are electrically connected in parallel to provide increased surface area for constant cross section.
13 citations
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13 Apr 1990TL;DR: In this article, the slow-wave structure is mounted in a support for the grid, while in a second embodiment, the grid is configured as plural, parallel meander lines forming the slowwave structure.
Abstract: A vacuum tube for amplifying an r.f. signal includes an assembly containing a cathode and grid for current modulating an electron beam derived from the cathode. One of the electrodes of the assembly includes a slow wave structure approximately resonant to the frequency of the signal. A cavity resonant to the frequency of the signal, positioned between the grid and a collector for the beam, is coupled to the beam. In one embodiment, the slow-wave structure is mounted in a support for the grid, while in a second embodiment, the grid is configured as plural, parallel meander lines forming the slow-wave structure. In the latter embodiment, the beam is preferably annular and the meander line geometry, in certain modifications, is adjusted so that there is a relatively small electric-field variation with radius over the portion of the grid through which the annular beam passes. In a further embodiment, the grid is configured as two interlaced spirals, driven by complementary replicas of the r.f. signal so the beam is formed at twice the frequency of the r.f. signal. Focusing electrodes configured as a perforated sheet, contacting the cathode, or as electrodes just downstream of the control grid, or both, collimate ,the beam, whether hollow or not.
13 citations
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28 Mar 196613 citations
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01 Aug 1957TL;DR: In this paper, a plausible physical picture of possible ion motions is obtained, and the question of whether or not this energy is sufficient to sustain oscillations is examined in a preliminary way.
Abstract: This paper refers briefly to some of the deleterious effects that often arise when positive ions are trapped in electron beams. Calculations aimed at establishing a useful picture of ion oscillations in gridded drift tubes are presented, and a plausible physical picture of some possible ion motions is obtained. In consequence of these motions, the electric field inside the drift tube undergoes one or more space reversals. When a beam of fast electrons traverses such a region, beam loading may be negative; this is calculated in some detail, both for ions and for a simple LC circuit. Thus a mechanism for energy transfer from the electron beam to the oscillating ions has now been found. The question of whether or not this energy is sufficient to sustain oscillations is examined in a preliminary way. The importance of secondary electrons in some cases is discussed. Comparison between experiment and theory shows that a good qualitative understanding now exists of such observed phenomena as continuous oscillations. The occurrence, however, of fluctuating ion oscillations is not predicted by the present theory.
13 citations
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23 Dec 1977TL;DR: A light concentrator for use with photovoltaic cells has a novel aspherical shape to provide the desired distribution of energy over the surface of the cell, which is obtained by making the ray-deflecting surface of a concentrator as a figure of revolution whose generating line focuses incident rays arriving parallel to the axis of revolution onto a point removed from the axis as discussed by the authors.
Abstract: A light concentrator for use with photovoltaic cells has a novel aspherical shape to provide the desired distribution of energy over the surface of the cell. The cell is usually circular with a current-collecting bus electrode around the circumference of the active surface. To provide for minimum resistive losses due to the current generated in the cell and flowing to the bus, the light may be concentrated in a band just inside the bus with reduced or even zero energy density inside the band. This distribution is obtained by making the ray-deflecting surface of the concentrator as a figure of revolution whose generating line focuses incident rays arriving parallel to the axis of revolution onto a point removed from the axis. Thus, a point source at infinity is "focused" into a circle around the axis instead of the point focus of conventional optics. Solar light is "focused" into an annular ring. Since the concentrated light pattern is larger than the true image formed by conventional optics with the same focal length, for a given size of cell the focal length can be made shorter and hence the accuracy tolerance of the concentrator surface is greatly relaxed, providing a reduction of cost.
13 citations
Authors
Showing all 2160 results
Name | H-index | Papers | Citations |
---|---|---|---|
Richard R. Ernst | 96 | 352 | 53100 |
Fred E. Regnier | 88 | 412 | 25169 |
Norbert Schuff | 88 | 280 | 25442 |
James S. Hyde | 79 | 412 | 35755 |
Carl Djerassi | 77 | 1523 | 37630 |
Ray Freeman | 73 | 269 | 22872 |
Robert Kaptein | 72 | 436 | 24275 |
Minghwei Hong | 58 | 515 | 14309 |
Jesse L. Beauchamp | 55 | 275 | 10971 |
Herbert Kroemer | 52 | 237 | 9936 |
Hans J. Jakobsen | 49 | 274 | 8401 |
James N. Eckstein | 42 | 168 | 6634 |
Ivan Bozovic | 31 | 128 | 5060 |
John Glushka | 31 | 76 | 3004 |
Gary Virshup | 24 | 113 | 2374 |