Showing papers on "Microchannel published in 1981"
TL;DR: In this article, a curved-channel MCP was proposed to achieve high gain in the pulse-counting mode at applied potentials of the order of 2000 V with maximum count-rate capabilities exceeding 105 counts mm−2s−1 and lifetime exceeding 2.5×1011 counts mm −2.
Abstract: Microchannel array plates (MCPs) in which the channels are curved to inhibit ion‐feedback, in an identical manner to that employed in a conventional channel electron multiplier, have been fabricated and their performance characteristics have been evaluated. These devices represent a major advance in MCP technology since a single curved‐channel MCP can be operated stably at high gain in the pulse‐counting mode. Gains of greater than 106 electrons pulse−1 have been obtained at applied potentials of the order of 2000 V with maximum count‐rate capabilities exceeding 105 counts mm−2s−1 and lifetimes exceeding 2.5×1011 counts mm−2.
99 citations
86 citations
TL;DR: In this paper, the behavior of optical detectors using microchannel plates (MCPs) as electron multipliers is described in terms of the physical parameters of the MCP (channel resistance, channel capacitance, channel wall secondary emission ratio, etc.).
Abstract: The behavior of optical detectors using microchannel plates (MCPs) as electron multipliers is described in terms of the physical parameters of the MCP (channel resistance, channel capacitance, channel wall secondary emission ratio, etc.). Three operating modes are included: (1) DC operation at low light levels, (2) pulse detection operation at high peak currents, and (3) single electron counting with cascaded V-plate and Z-plate MCPs.
74 citations
TL;DR: The characteristics of a high gain type ITT F4129 photomultiplier having three micro-channel plates in cascade for electron multiplications have been investigated in this paper.
Abstract: The characteristics of a high gain type ITT F4129 photomultiplier having three microchannel plates in cascade for electron multiplications have been investigated. These plates are in the Z-configuration. Measurements are given of the gain, dark current, cathode quantum efficiency, anode pulse linearity, electron transit time, single and multiphoton time spreads, fatigue, and pulse height resolution. The gain as a function of transverse magnetic field has been measured and is discussed. Photomultiplier characteristics as a function of the input pulse repetition frequency have also been investigated and discussed.
35 citations
TL;DR: Several forms of microchannel plate photomultiplier tubes (MCP PMT) for both high speed and multiple anode output applications are discussed in this article, where performance data on photocathode types, gain, background, for each tube type is given.
Abstract: Several forms of microchannel plate photomultiplier tubes (MCP PMT) for both high speed and multiple anode output applications are discussed. These tubes are from one MCP, with moderate gain, to three MCPs for photon counting gain levels. Proximity focus maintains distortion-free imaging through the tube structure. Performance data on photocathode types, gain, background, for each tube type is given.
16 citations
TL;DR: A microchannel plate has about half a million channels per square centimeter, each of which functions as an independent electron multiplier as discussed by the authors, which can be constructed in a sealed envelope.
Abstract: A microchannel plate has about half a million channels per square centimeter, each of which functions as an independent electron multiplier An MCP photomultiplier containing a photocathode, MCP and an anode can be constructed in a sealed envelope The advantages of the MCP photomultiplier over a conventional photomultiplier are better time resolutions, ability to run in magnetic fields, and imaging possibilities In principle, the three advantages can be incorporated in a single unit With the current state of the technology, it is best to realize any two advantages in a tube
14 citations
Patent•
07 Jul 1981
TL;DR: In this article, getters are placed on the probable path followed by the ions under the action of potentials applied to the electrodes, and electrodes to which the getters adhere are designed in two parts or constituent elements in order to permit the supply of getters if necessary.
Abstract: In order to limit the increased quantity of ions produced within the tube as a result of the presence of a microchannel element within the tube, getters are placed on the probable path followed by the ions under the action of potentials applied to the electrodes The electrodes to which the getters adhere are designed in two parts or constituent elements in order to permit the supply of getters if necessary The electrode elements are bent-back in order to serve as shields in the case of vaporizable getters
4 citations
TL;DR: In this paper, the properties of a microchannel plate exposed to a high energy hadron beam have been studied and the beam was passed through the plate transverse to the microchannel axes, about 2 microchannels per millimeter were excited and an rms error of less than 10μm.
3 citations