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Saturday, August 1, 2020 | History

2 edition of Combined magnetic and electrostatic quadruple electron lenses. found in the catalog.

Combined magnetic and electrostatic quadruple electron lenses.

D.F Hardy

Combined magnetic and electrostatic quadruple electron lenses.

by D.F Hardy

  • 319 Want to read
  • 23 Currently reading

Published by University Microfilms in Ann Arbor .
Written in English


Edition Notes

Thesis (Ph.D) - University of Cambridge (Mass.), 1967.

The Physical Object
Pagination1 microfilm
ID Numbers
Open LibraryOL13876442M

In order to simulate realistic electron optical systems, we have enhanced our DA software to handle practical lens geometries, by combining it with Hermite fitting of the numerically computed lens fields. Computed results are presented for an electron lens with superimposed magnetic and electrostatic . The focusing system is an essential part of any ion microbeam system and focusing of MeV ion beams is generally accomplished using quadrupole lenses. There are two types of quadrupole lenses requiring the application of either voltage or current to provide the excitation, but there is also the possibility of utilizing lenses constructed from permanent magnets.

@article{osti_, title = {ELECTROSTATIC QUADRUPOLE LENSES}, author = {Septier, A and Van Acker, J}, abstractNote = {The expression for the potential theta (x,y,z) within the useful zone of a quadrupole lens was established not only for the excitation potentials symmetrical with respect to the earth, but also when these potentials are asymmetrical. Other articles where Electromagnetic lens is discussed: electron microscope: Operating principles: lenses, but modern instruments use electromagnetic lenses. These consist of a solenoid of wire together with a magnetic pole piece that creates and concentrates a magnetic field. The lenses used for the condenser and projector system of the microscope differ from the objective lens only in.

This timely handbook contains chapters on the essential elements of high resolution charged particle optics and is written by many of the world's leading research scientists. It is a complete guide to understanding, designing, and using high resolution instrumentation such as transmission electron microscopes (TEMs), scanning electron microscopes (SEMs), scanning transmission electron. AN article by K. Spangenberg and L. M. Field (Elec. Comm., 21, No. 3; ) describes and discusses the measured characteristics of a number of electrostatic lenses, giving the characteristic.


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Combined magnetic and electrostatic quadruple electron lenses by D.F Hardy Download PDF EPUB FB2

Combined magnetic and electrostatic quadrupole electron lenses Author: Hardy, D. Awarding Body: University of Cambridge Current Institution: University of Cambridge Date of Award: Availability of Full Text. Magnetic Electron Lenses (Topics in Current Physics (18)) Softcover reprint of the original 1st ed.

Edition by P.W. Hawkes (Editor, Contributor) ISBN ISBN Why is ISBN important. ISBN. This bar-code number lets you verify that you're getting exactly the right version or edition of a book. Electron Optics, Second English Edition, Part I: Optics is a chapter book that begins by elucidating the fundamental features and basic techniques of electron optics, as well as the distribution of potential and field in electrostatic lenses.

This book then explains the field distribution in magnetic lenses; the optical properties of Book Edition: 2. PDF | Key words The optimization calculations are made to find the optimum properties of combined quadrupole lens consist of electrostatic and magnetic | Find, read and cite all the research.

Combining one or multiple quadrupole lenses with electrostatic and magnetic sector fields became the most successful way of designing high‐performance magnetic mass spectrometers with corrected second‐order or even third‐order aberrations (Matsuda,Matsuda,Matsuda,Matsuda,Matsuda,Matsuo et al., Author: Mikhail Yavor.

We report on three compound magnetic and electrostatic lenses for low‐voltage applications: an immersion condenser lens, a compound spectrometer objective lens for electron beam testing, and an objective lens for a low‐voltage scanning electron microscope (SEM).

A common characteristic of all lenses is the electrostatic retarding field in front of an intermediate, or the final crossover image. The magnetic field at the centre is zero and for the x-direction exerts force proportional to the x coordinate that moves the charged particle towards the centre of the lens.

The mathematical treatment of focusing with a quadrupole lens system is intricate and the. Electric and Magnetic Field Lenses by continuous confining forces which balance the outward forces or through a periodic array of lenses which deflect the particles toward the axis.

In the latter case, the beam outer radius (or envelope) oscillates about a constant value. electrostatic lens, magnetic lens, and space charge effect [Miyamoto and Hatayama ]. The task of decreasing spherical and chromatic aberrations is currently important in the development of electron and ion optics of axis symmetric electron-optical system (EOS S).

There. distance from the axis, r, is the key property. Electrostatic Lens would like to have (e.g.) E a E r = r () a but the lens can’t have charged solids in its middle because the beams must pass through so (initially) ρ = 0 ⇒.E = 0.

Consequently pure E r is impossible (0.E = 1∂(rE r)/∂r = r Electrostatic and magnetic quadrupoles are comparatively open structures and it is intuitively obvious that the field function characterizing a quadrupole lens, p 2 (z) or Q 2 (z), will have a roughly bell-shaped distribution if the poles or electrodes are short; if, on the other hand, they extend far along the axis relative to the bore radius, we may expect the distribution to exhibit a.

This work aims to find the optimum design of electrostatic quadrupole lens and make the comparison between two different electrodes shapes which are computed with the aid of transfer matrices.

the variety of magnetic and electrostatic lenses and techniques combined in a modern scientific instrument. Conventional electron microscopy, which places great demands on the design and construction of electron lenses, has made steady progress over the years.

An electrostatic lens is a device that assists in the transport of charged particles. For instance, it can guide electrons emitted from a sample to an electron analyzer, analogous to the way an optical lens assists in the transport of light in an optical instrument.

Systems of electrostatic lenses can be designed in the same way as optical lenses, so electrostatic lenses easily magnify or. Motion in Combined Electric and Magnetic Fields It has long been known that charged particles move in circular orbits in the magnetic field. The Van Allen radiation belts in space around the earth consist of these energetic charges trapped in the magnetic field of the earth.

Electron Beams, Lenses, and Optics, Volume 2 deals with the aberrations relating to electronic optics. This book discusses the geometrical aberrations of lenses; spherical aberration of electric and magnetic lenses; and measurement of the spherical aberration of various electric and magnetic lenses.

Design. A magnetic lens typically consists of several electromagnets arranged in a quadrupole (see quadrupole magnet), sextupole, or higher format; the electromagnetic coils are placed at the vertices of a square or another regular this configuration a customized magnetic field can be formed to manipulate the particle beam.

The passing particle is subjected to two vector forces. The methods are illustrated by several examples, including a wide‐angle focusing and deflection system with fifth‐order aberrations, a combined magnetic and electrostatic lens, a ‘supertip’ ion source, an electron mirror with negative spherical and chromatic aberration, and a chromatically corrected quadrupole lens.

Electrostatic lenses are used for the extraction, preparation and rst acceleration of electron and ion beams. V ery often ion optics with electrostatic lenses is called electron optics.

Electrostatic lenses are of great importance in the design of low ener gy electrostatic accelerators like Cockcroft W alton and V an de Graaf f accelerators. After four decades of attempts to correct the primary spherical and chromatic aberrations of electron lenses that led to no improvement in resolution, success was at last achieved in the s with.

Basic ideas underlying the design of a precision magnetic quadrupole lens for a nuclear scanning microprobe with a maximal accelerating voltage of 14 MV are set forth.

Four magnetic quadrupoles are combined into doublets.Electric-magnetic quadrupole- octupole. Cs / Cc. Various configurations for TEM and SEM: Electrostatic Einzel-lens- quadrupole-octupole.

Cs / Cc. High requirement to stability of voltage sources, low energy. Frontiers of Characterization and Metrology for Nanoelectronics Page Corrected electron optics implementation in Transmission.Pulsed magnetic quadrupole lenses p.

Improvement of sensitivity and depth resolution in conventional RBS and ERDA techniques using energy/momentum filters p. Curvature of the effective field boundary of realistic sector magnets p. Split shielding plates in electrostatic sector analyzers and Wien filters p.

Fringe-field-induced.