By Levi Schächter
The major subject of this publication is the interplay of electrons with electromagnetic waves within the presence of periodic and quasi-periodic buildings 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 basic electromagnetic phenomena and electron dynamics. the second one a part of the ebook describes the present types for beam-wave interactions with periodic and quasi-periodic buildings. this can be the root for introducing, within the final a part of the booklet, a couple of particle and radiation assets that leisure on those rules, particularly the free-electron laser, wake-field acceleration schemes and several complex particle accelerator concepts.
This moment version brings this primary textual content up to date in view of the large advances which were remodeled the decade because the first version 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 reinforce this book’s usefulness for instructing really good graduate courses.
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Extra info for Beam-Wave Interaction in Periodic and Quasi-Periodic Structures
1 Constitutive Relations Matter reacts to the presence of an electromagnetic field. The constitutive relations characterize this reaction in terms of the dynamics of charges at the microscopic level. In general these relations are non-linear and they couple together all the components of the electromagnetic field. In many cases the constitutive relations are linear and even then the relations are not necessarily simple since they can form a tensor. to = 411" X 10- 7 henry1m are the vacuum permittivity and permeability respectively.
2. In many of the devices of interest the waves are guided by waveguides, therefore a short discussion on TEM, TM and TE modes in various configurations is presented in Sect. 3. When source terms are present (current and charge density) it is particularly useful to use Green's function method for solution of the electromagnetic field. This method is discussed in Sect. 4 and is accompanied by two examples which illustrate the Cerenkov radiation in free space and in a waveguide. In Sect. 5 several finite length effects are considered, in particular, reflection effects and transients in a cavity.
76 GHz can be achieved before the system oscillates. Although no rf breakdown was observed, the fact that the input is no longer isolated from the output, allows waves to be reflected backwards and this feedback causes the system to oscillate. In order to isolate the input from the output the TWT was split in two sections separated by a sever (waveguide made of lossy material which operates below cutoff). The second set of experiments on a two-stage high power TWT indicated that power levels in excess of 400 MW are achievable with no indication of rf breakdown [Shiffler (1991)].