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In the presentation theoretical foundations of electromagnetic fields are reviewed. First, general terms and concepts of field theory are discussed (scalar fields, vector fields, normal and tangential fields, dot product, cross product etc.) and then Maxwell’s equations in the integral form and material equations are recapitulated. It is shown how Maxwell’s equations in the integral form...
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In the presentation, theoretical foundations of electromagnetic fields are reviewed. First, general terms and concepts of field theory are discussed (scalar fields, vector fields, normal and tangential fields, dot product, cross product etc.) and then Maxwell’s equations in the integral form and material equations are recapitulated. It is shown how Maxwell’s equations in the integral form...
In the presentation foundations of electromagnetic simulations are recapitulated. Initially, the need for numerical methods used in electromagnetic simulations is motivated. Then, spatial discretization is discussed in a general way. This will be followed by a detailed introduction to the finite-integration technique, which allows to transfer of Maxwell’s equations into their discrete...
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In the presentation foundations of electromagnetic simulations are recapitulated. Initially, the need for numerical methods used in electromagnetic simulations is motivated. Then, spatial discretization is discussed in a general way. This will be followed by a detailed introduction to the finite-integration technique, which allows to transfer Maxwell’s equations into their discrete...
The focus for this educational text is selected examples of high-frequency electronic circuits and their components employed for the accurate phasing and synchronisation of accelerator cavities. Examples have been chosen to describe the basics of RF electronics. The starting point is transmission lines, connectors, discontinuities and the handling of reflection. The application of simple...
We reviewed the techniques of transport of high-power radiofrequency power from a RF power source to the cavities of an accelerator.
Waveguide and coaxial lines are explained showing power limits.
Main power couplers are also explained, on the construction side of it.
The focus of this educational text is selected examples of high-frequency electronic circuits and their components employed for the accurate phasing and synchronisation of accelerator cavities. Examples have been chosen to describe the basics of RF electronics. The starting point is transmission lines, connectors, discontinuities and the handling of reflection. The application of simple...
The contribution is on issues being especially related to normal conducting cavities operating at non-relativistic beam energies. Various types of cavities are introduced w.r.t. their operation mode, application, pros, and cons. Special emphasis is put on their production and the challenges along the way from finalised RF design up to the operating cavity. This covers the choice of material,...
We discuss recent progress in Terahertz and optical radiation generation and its use in acceleration and beam manipulation. The advantage of using short wavelength radiation is overcoming breakdown phenomena, enabling high gradient accelerators with lower bunch charge. Early results on guns, beam manipulation devices and accelerator structures are discussed.
"RF cavities loaded with magnetic alloy (MA) or ferrite ring cores are used in synchrotrons and storage rings if the maximum RF frequency is in the order of a few MHz. A simple model for the description of cavities of this type is derived. The most important parameters are defined, and some properties of the material and of the cavity are summarised.
Different cavity configurations,...
The lecture reviews general concepts of beam-induced electromagnetic fields in accelerator devices. The concept of momentum kick is introduced and thus wake function and wake potential. The case of single-particle Green function as well as the bunch case are treated, giving the definition of the typically used quantities to describe such effects. Coupling impedance is introduced as Fourier...
The lecture reviews general concepts of diagnostics for beam intensity diagnostics, beam transverse position and bunch length as well as beam arrival. Such concepts are discussed with some examples. Concerning the beam intensity, current transformers and passive cavity are presented by showing the working principle and the main properties. Strip-lines and cavity beam position monitors have...
The lecture reviews general concepts of diagnostics for beam intensity diagnostics, beam transverse position and bunch length as well as beam arrival. Such concepts are discussed with some examples. Concerning the beam intensity, current transformers and passive cavity are presented by showing the working principle and the main properties. Strip-lines and cavity beam position monitors have...
