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Title: High-speed multiframe dynamic transmission electron microscope image acquisition system with arbitrary timing

Abstract

An electron microscope is disclosed which has a laser-driven photocathode and an arbitrary waveform generator (AWG) laser system ("laser"). The laser produces a train of temporally-shaped laser pulses of a predefined pulse duration and waveform, and directs the laser pulses to the laser-driven photocathode to produce a train of electron pulses. An image sensor is used along with a deflector subsystem. The deflector subsystem is arranged downstream of the target but upstream of the image sensor, and has two pairs of plates arranged perpendicular to one another. A control system controls the laser and a plurality of switching components synchronized with the laser, to independently control excitation of each one of the deflector plates. This allows each electron pulse to be directed to a different portion of the image sensor, as well as to be provided with an independently set duration and independently set inter-pulse spacings.

Inventors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1258006
Patent Number(s):
9,373,479
Application Number:
14/851,692
Assignee:
Lawrence Livermore National Security, LLC (Livermore, CA) LLNL
DOE Contract Number:
AC52-07NA27344
Resource Type:
Patent
Resource Relation:
Patent File Date: 2015 Sep 11
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 36 MATERIALS SCIENCE

Citation Formats

Reed, Bryan W., Dehope, William J, Huete, Glenn, LaGrange, Thomas B., and Shuttlesworth, Richard M. High-speed multiframe dynamic transmission electron microscope image acquisition system with arbitrary timing. United States: N. p., 2016. Web.
Reed, Bryan W., Dehope, William J, Huete, Glenn, LaGrange, Thomas B., & Shuttlesworth, Richard M. High-speed multiframe dynamic transmission electron microscope image acquisition system with arbitrary timing. United States.
Reed, Bryan W., Dehope, William J, Huete, Glenn, LaGrange, Thomas B., and Shuttlesworth, Richard M. Tue . "High-speed multiframe dynamic transmission electron microscope image acquisition system with arbitrary timing". United States. doi:. https://www.osti.gov/servlets/purl/1258006.
@article{osti_1258006,
title = {High-speed multiframe dynamic transmission electron microscope image acquisition system with arbitrary timing},
author = {Reed, Bryan W. and Dehope, William J and Huete, Glenn and LaGrange, Thomas B. and Shuttlesworth, Richard M},
abstractNote = {An electron microscope is disclosed which has a laser-driven photocathode and an arbitrary waveform generator (AWG) laser system ("laser"). The laser produces a train of temporally-shaped laser pulses of a predefined pulse duration and waveform, and directs the laser pulses to the laser-driven photocathode to produce a train of electron pulses. An image sensor is used along with a deflector subsystem. The deflector subsystem is arranged downstream of the target but upstream of the image sensor, and has two pairs of plates arranged perpendicular to one another. A control system controls the laser and a plurality of switching components synchronized with the laser, to independently control excitation of each one of the deflector plates. This allows each electron pulse to be directed to a different portion of the image sensor, as well as to be provided with an independently set duration and independently set inter-pulse spacings.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 21 00:00:00 EDT 2016},
month = {Tue Jun 21 00:00:00 EDT 2016}
}

Patent:

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  • An electron microscope is disclosed which has a laser-driven photocathode and an arbitrary waveform generator (AWG) laser system ("laser"). The laser produces a train of temporally-shaped laser pulses of a predefined pulse duration and waveform, and directs the laser pulses to the laser-driven photocathode to produce a train of electron pulses. An image sensor is used along with a deflector subsystem. The deflector subsystem is arranged downstream of the target but upstream of the image sensor, and has two pairs of plates arranged perpendicular to one another. A control system controls the laser and a plurality of switching components synchronizedmore » with the laser, to independently control excitation of each one of the deflector plates. This allows each electron pulse to be directed to a different portion of the image sensor, as well as to be provided with an independently set duration and independently set inter-pulse spacings.« less
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  • A confocal scanning transmission electron microscope which includes an electron illumination device providing an incident electron beam propagating in a direction defining a propagation axis, and a precision specimen scanning stage positioned along the propagation axis and movable in at least one direction transverse to the propagation axis. The precision specimen scanning stage is configured for positioning a specimen relative to the incident electron beam. A projector lens receives a transmitted electron beam transmitted through at least part of the specimen and focuses this transmitted beam onto an image plane, where the transmitted beam results from the specimen being illuminatedmore » by the incident electron beam. A detection system is placed approximately in the image plane.« less
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  • This patent describes a hydraulic fluid pressure control system for an automatic transmission comprising: a source of hydraulic fluid pressure; a line fluid pressure regulation valve, which is supplied with the fluid pressure from the source of hydraulic fluid pressure and a booster pressure to produce a controlled line fluid pressure which increases as the booster pressure increases; a manually operated selector valve, which is selectable between a plurality of positions denoting speed ranges including a D range and at least one other forward speed range in which the highest gear speed stage available is lower than the highest gearmore » speed stage available in the D range, which receives a supply of the line fluid pressure, which produces as output a lower range fluid pressure substantially equal in pressure value to the line fluid pressure when the other forward speed range is selected thereon, and which does not produce as output the lower range fluid pressure when the D range is selected thereon; and a throttle fluid pressure control valve, which receives a supply of the line fluid pressure, and which produces therefrom a throttle fluid pressure whose value varies according to a quantity representative of engine load.« less