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electron gun și extrase din aceasta pentru a furniza contextul de întrebuințare al acestuia în literatura Engleză.
The electron gun Thermionic emission is used to produce a continuous supply of
electrons. An electron gun is then used to form a narrow beam of fast electrons or
a 'cathode ray' inside an evacuated tube. Such tubes, known as cathode-ray ...
2
Transmission
Electron Microscopy: A Textbook for Materials ...
Schematic diagram of a thermionic electron gun. A high voltage is placed
between the cathode and the anode, modified by a potential on the Wehnelt
which acts as the grid in a triode system. The electric field from the Wehnelt
focuses the ...
David B. Williams, C. Barry Carter, 2009
3
Intense
Electron and Ion Beams
Tetrode Type Electron Gun with Shadow Grid The schematic drawing of the gun
is shown in Fig. 5.24. On the grid GI, which is called shadow one, zero (cathode)
potential is applied and therefore electrons moving from the cathode can not ...
Sergey Ivanovich Molokovsky, A. D. Sushkov, 2005
4
Physical Principles of
Electron Microscopy: An Introduction ...
Another important component of the electron gun (Fig. 3-1) is the Wehnelt
cylinder, a metal electrode that can be easily removed (to allow changing the
filament or LaB6 source) but which normally surrounds the filament completely
except for a ...
5
Linear Accelerators for Radiation Therapy, Second Edition
Some linear accelerators require regular replacement of the electron gun
cathode on site. The total time required for a gun replacement is dependent
mainly on the time required to degas the new cathode, and this is a relatively
rapid process ...
David Greene, P.C Williams, 1997
6
Principles of Analytical
Electron Microscopy
(49) is relatively constant for a given type of electron gun (more precisely,
electron source brightness 0 is fixed for a given electron source). large values of i
, correspond to large values of dr. and small values of dp correspond to small
values of ...
David C. Joy, Alton D. Romig Jr., Joseph Goldstein, 1986
7
Reflection High-Energy
Electron Diffraction
3.3 Electron gun design An electron gun for RHEED experiments is suitable for
laboratory construction. The only parameters in the design of an electron gun are
the aperture sizes of the anode, the Wehnelt electrode and the electron lens, and
...
Ayahiko Ichimiya, Philip I. Cohen, 2004
8
Scanning
Electron Microscopy, X-Ray Microanalysis, and ...
Purpose. This laboratory demonstrates: (1) electron gun saturation and alignment
; (2) the measurement of beam current, beam size, and beam convergence; (3)
the concept of electron gun brightness; and (4) the effects of these parameters on
...
9
Trapping Highly Charged Ions: Fundamentals and Applications
3.2.2 Outgassing of hot surfaces There are two main regions that are hot in the
EBIS, and that generate considerable gas load: the electron gun and the Ti
sublimation pumps. Other hot elements - cathodes of vacuum gauges and
cathode of ...
10
Analysis of Excitation and Ionization of Atoms and Molecules ...
3.4.4 The Electron Gun The electron gun used in these investigations is a simple,
high-performance electrostatically focused electron gun which provides a useful
electron beam over an energy range from a few electron volts to $500 eV.
Afzal Chaudhry, Hans Kleinpoppen, 2010
ȘTIRI NOI CARE INCLUD TERMENUL «ELECTRON GUN»
Află ce ziare naționale și internaționale au scris despre și cum este întrebuințat termenul
electron gun în contextul următoarelor știri.
Rapid-fire electron gun may reveal dance of atoms
Humans are very much visual creatures. A picture speaks a thousand words, even in science. Think of some of the famous Hubble telescope ... «Ars Technica, Iul 15»
NASA Could Soon Launch A Giant Solar Sail Beyond Our Solar …
Electrons inevitably picked up along the way are expunged from the craft by an onboard electron gun, and the entire craft will rotate once per ... «Popular Science, Iul 15»
Who Needs GPS? The Forgotten Story of Etak's Amazing 1985 Car …
For a display, the engineers selected a vector-based CRT, a display tube capable of only drawing lines with a single electron gun, similar to ... «Fast Company, Iun 15»
Arcam's Q10 EBM Printer Answers the Need for Customized Metal …
Using electromagnetic coils, the Q10's electron gun can quickly and accurately trace a profile predetermined by CAD input. Given the power ... «ENGINEERING.com, Iun 15»
Synopsis: Chip-Size Beam Splitter for Electrons
Using an electron gun (like those from old TV sets), the researchers fired electrons with around electron volt of energy into one side of the guide ... «Physics, Iun 15»
Preventing Damage in NASCAR Engines Using Stereo Microscopy
After positioning the electron gun at the ROIs, HDBSE imaging helped in determining embedded foreign particles, thanks to sensitivity to ... «Azom.com, Iun 15»
Evolving Electron Microscopes Push Even Deeper
It also has a new field emission electron gun with a vacuum 100X greater than conventional field emission guns (3 x 10-10 Pa). The gun can ... «R & D Magazine, Iun 15»
Bright blue aurorae dance above the surface of Mars
Birkeland's "Terrella" consisted of shooting electrons from an electron gun towards a magnetised sphere that had been placed in a vacuum, ... «Sen, Mai 15»
Microscopy: Quantum control of free electrons
Feist and colleagues' experimental achievement lies largely in the development of an electron gun that generates electron pulses with high ... «Nature.com, Mai 15»
"Sailing" spaceship could make return trips to Mars easier
... very long thin conducting filaments and an on-board electron gun to create a field that the solar wind then "pushes" against to propel the craft. «Gizmag, Apr 15»
