Measurements

Beam-Wave Interaction in Periodic and Quasi-Periodic by Levi Schächter PDF

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By Levi Schächter

ISBN-10: 3642198473

ISBN-13: 9783642198472

The major subject of this ebook is the interplay of electrons with electromagnetic waves within the presence of periodic and quasi-periodic constructions in vacuum, in view of purposes within the layout and operation of particle accelerators.

The first a part of the booklet is worried with the textbook-like presentation of the fundamental fabric, specifically reviewing user-friendly electromagnetic phenomena and electron dynamics. the second one a part of the booklet describes the present versions for beam-wave interactions with periodic and quasi-periodic constructions. this is often the root for introducing, within the final a part of the booklet, a few particle and radiation assets that leisure on those rules, specifically the free-electron laser, wake-field acceleration schemes and several other complex particle accelerator concepts.

This moment version brings this basic textual content updated in view of the large advances which were remodeled the decade because the first variation used to be released. All chapters, in addition to the bibliography, were considerably revised and prolonged, and the variety of end-of-chapter routines has been extra elevated to augment this book’s usefulness for educating really expert graduate classes.

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Additional resources for Beam-Wave Interaction in Periodic and Quasi-Periodic Structures

Sample text

The dynamics of the particles in this region is not in our scope in the framework of this monograph. 3 Advanced Acceleration Concepts Charged particles are accelerated in either a cavity or slow-wave structure by an electromagnetic wave. The latter’s frequency varies between 500 MHz to 30 GHz and the power levels scale, as a rough estimate for a given gradient, as P / f À2 therefore it is just natural to aim for higher frequencies since the necessary power is reduced accordingly. Moreover, the threshold for breakdown at higher frequencies is elevated facilitating higher gradients thus shorter structures.

Secondly, as it moves upwards its (dc) potential energy varies. Again, this is converted into electromagnetic energy. Two major differences between the magnetron and other radiation sources mentioned above, are evident: (1) in the magnetron, the beam generation, acceleration and collection occur all in the same region where the interaction takes place. (2) The potential energy associated with the presence of the charge in the gap plays an important role in the interaction; the other device where this is important is the vircator briefly discussed in the next sub-section.

We start our discussion with the trivial observation that any radiation source consists of at least two components: electron beam and electromagnetic wave. From the wave perspective the first question we should ask is whether it is guided or confined by metallic walls as is the case in most sources, or if it can propagate in free space as is the case in a few of the free electron laser schemes. If it is guided, then the next question is whether its phase velocity is smaller or greater than c. The first category is that of slow-wave devices and its main members are the traveling wave tube and the backward wave oscillator (BWO).

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Beam-Wave Interaction in Periodic and Quasi-Periodic Structures by Levi Schächter


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