Download PDF by Peter W. Hawkes: Advances in Imaging and Electron Physics, Volume 193

By Peter W. Hawkes

ISBN-10: 0128048158

ISBN-13: 9780128048153

The 2 chapters that fill this quantity describe instruments for learning the brightness of electron beams and for analysing the houses of mass spectrometers.

First, L.D. Duffy and A.J. Dragt introduce the concept that of eigen-emittance. 3 kinematic invariants are linked to charged-particle beams, in linear delivery mode. those invariants are often called eigen-emittances and a learn in their homes makes it attainable to tailor the beam to slot the applying in query. the idea is predicated at the proposal of sym-plectic beam shipping, a topic on which A.J. Dragt has already contributed to those Advances (Advances in Electronics & Electron Physics, sixty seven, 1986, 65—120, with E. Forest). The authors first recapitulate the fundamental conception sooner than explaining how the emittance might be tailored as required. the rest of the bankruptcy, which shape a brief treatise at the topic, offers a number of applications.

In the second one bankruptcy, I. Spivak-Lavrov describes at size methods of analysing the houses of either static and time-of-flight mass spectrometers and of devising new designs. The optics of those tools is decided out intimately, in an try and make the item self-contained. a lot Russian paintings is stated, usually from journals that aren't to be had in English translation and every so often, should not largely on hand open air their nations of foundation.

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Extra info for Advances in Imaging and Electron Physics, Volume 193

Example text

D2 r rΦ 1 dr ¼ + pffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi 2 dl 2 ðΦ + εΦ 0 Þ 2 ðΦ + εΦ 0 Þ ð1 + γ Þ dl ! ! ! dr dr rΦ , Á Âr ΩÀ dl dl 2Φ + εΦ0 (6) ! where r is the radius-vector of a particle. If for a basis we take the relativistic equation of movement that is given by Landau and Lifshits (1973) in dimensionless variables, it will be written in the form ! qffiffiffiffiffiffiffiffiffiffiffiffi h ! ! ! i dβ ð1 + γ Þ (7) ¼ 1 À β2 r Φ + β Â r ΩÀ β β Á r Φ : dτ Using the relativistic law of conservation of energy, 1 Φ + εΦ0 pffiffiffiffiffiffiffiffiffiffiffiffiffi ¼ 1 + , 2 1+γ 1Àβ (8) and passing in Eq.

CO deals with problems caused by the formation of charged particle beams and the control of these beams. First of all, it is possible to highlight the tasks connected with the distribution of charged particle beams according to their mass and energy, which are solved via mass- and power-analysis, as well as problems of transportation and focusing of beams that arise in electronic and ionic microscopy and lithography. To solve these tasks, the theoretical methods borrowed from light optics are usually used in CO; namely, at first, the solution of a linear task or paraxial approximation is found, and then the theory of aberrations is formulated.

The method of consecutive approximations used for finding aberrational coefficients leads to very bulky expressions for highorder coefficients. At that, it is impossible to define within the aberrational theory itself, for what values of small parameters characterizing a beam, the chosen approximation still works rather well. At present, it is possible to observe the departure from the classical tradition when attempts are made to solve problems of charged particle optics in a straightforward manner (directly, using the known equations of electrodynamics and mechanics) by using the power of modern computers.

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Advances in Imaging and Electron Physics, Volume 193 by Peter W. Hawkes


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