In-flight performance of a 200mm x 200mm microchannel plate detector

In-flight performance of the SUMER microchannel plate detectors

10.1117/12.330312 ◽

1998 ◽

Cited By ~ 3

Author(s):

Neil W. Griffiths ◽

Sabine Airieau ◽

Oswald H. W. Siegmund

Keyword(s):

Microchannel Plate ◽

Flight Performance

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The Berkeley Spectrometer for ORFEUS: Laboratory and In-Flight Performance

International Astronomical Union Colloquium ◽

10.1017/s0252921100036629 ◽

1996 ◽

Vol 152 ◽

pp. 601-609

Author(s):

Mark Hurwitz ◽

Stuart Bowyer

Keyword(s):

Oral Presentation ◽

Delay Line ◽

Microchannel Plate ◽

Flight Performance ◽

Line Spacing

The Berkeley spectrometer aboard the ORFEUS payload achieved a variety of “firsts” during its inaugural mission in September 1993. The instrument utilizes spherical gratings with mechanically ruled varied line-spacing, and curved microchannel plate detectors with delay-line anode readout systems, to cover the 390 – 1200 Å band at a resolution of λ/5000. The instrument will be discussed, and its performance illustrated with calibration and in-flight spectra. Science highlights from the ORFEUS-I mission will be presented (oral presentation only). The payload will be available for use by guest investigators during the ORFEUS-II mission currently scheduled for late 1996.

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Effect of energy filtering on micro-diffraction in the SEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010017075x ◽

1994 ◽

Vol 52 ◽

pp. 604-605

Author(s):

James F. Mancuso ◽

Leo A. Fama ◽

William B. Maxwell ◽

Jerry L. Lehman ◽

Hasso Weiland ◽

...

Keyword(s):

Detection Efficiency ◽

Ccd Camera ◽

High Gain ◽

Microchannel Plate ◽

Electrostatic Energy ◽

Energy Filtering ◽

Electron Channelling ◽

Low Energy Electrons ◽

Low Sensitivity ◽

Angular Field Of View

Micro-diffraction based crystallography is essential to the design and development of many classes of ‘crafted materials’. Although the scanning electron microscope can provide crystallographic information with high spatial resolution, its current utility is severely limited by the low sensitivity of existing diffraction techniques (ref: Dingley). Previously, Joy showed that energy filtering increased contrast and pattern visibility in electron channelling. This present paper discribes the effect of energy filtering on EBSP sensitivity and backscattered SEM imaging.The EBSP detector consisted of an electron energy filter, a microchannel plate detector, a phosphor screen, optical coupler, and a slow scan CCD camera. The electrostatic energy filter used in this experiment was constructed as a cone with 5 coaxial electrodes. The angular field-of-view of the filter was approximately 38°. The microchannel plate, which was the initial sensing component, had high gain and had 50% to 80% detection efficiency for the low energy electrons that passed through the retarding field filter.

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Low - Voltage Scanning Electron Microscopy Imaging, Secondary and Backscatter, With Microchannel Plate Detector

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100180963 ◽

1990 ◽

Vol 48 (1) ◽

pp. 442-442

Author(s):

Galen Powers ◽

Ray Cochran

Keyword(s):

Low Voltage ◽

Beam Current ◽

Microchannel Plate ◽

Normal Operation ◽

Microscopy Imaging ◽

Backscatter Signal ◽

Vacuum Interface ◽

Width Measurements ◽

Working Distance ◽

Beam Currents

The capability to obtain symmetrical images at voltages as low as 200 eV and beam currents less than 9 pico amps is believed to be advantageous for metrology and study of dielectric or biological samples. Symmetrical images should allow more precise and accurate line width measurements than currently achievable by traditional secondary electron detectors. The low voltage and current capability should allow imaging of samples which traditionally have been difficult because of charging or electron beam damage.The detector system consists of a lens mounted dual anode MicroChannel Plate (MCP) detector, vacuum interface, power supplies, and signal conditioning to interface directly to the video card of the SEM. The detector has been miniaturized so that it does not interfere with normal operation of the SEM sample handling and alternate detector operation. Biasing of the detector collection face will either add secondaries to the backscatter signal or reject secondaries yielding only a backscatter image. The dual anode design allows A−B signal processing to provide topological information as well as symmetrical A+B images.Photomicrographs will show some of the system capabilities. Resolution will be documented with gold on carbon. Variation of voltage, beam current, and working distance on dielectric samples such as glass and photoresist will demonstrate effects of common parameter changes.

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