منابع مشابه
Numerical Calculation of Small-angle Collimator Wakefields for Short Bunches
Collimators are used to eliminate halo particles from the beam. To relax the wakefield effects a gradual transition from a large to a small aperture is used. However, the existing computer codes face severe problems for long tapered transitions. Two main sources of the problems are the grid dispersion and the staircase geometry approximation. Using recently developed time domain numerical appro...
متن کاملWakefields of Very Short Bunches in an Accelerating Cavity *
The behavior of the longitudinal and transverse wakefields of short bunches in an -accelerating cavity has been examined. Computations of short time wakefields have been carried out using. T. Weiland’s computer program TBCI,l which integrates Maxwell’s Equations in the time domain. We present also our version of the diffraction model of the high frequency impedance of the cavity, a model origin...
متن کاملTESLA Report 2003-18 NUMERICAL CALCULATION OF SMALL-ANGLE COLLIMATOR WAKEFIELDS FOR SHORT BUNCHES
Collimators are used to eliminate halo particles from the beam. To relax the wakefield effects a gradual transition from a large to a small aperture is used. However, the existing computer codes face severe problems for long tapered transitions. Two main sources of the problems are the grid dispersion and the staircase geometry approximation. Using recently developed time domain numerical appro...
متن کاملOptimization of the Dechirper for Electron Bunches of Arbitrary Longitudial Shapes*
Dechirper is a passive device composed of a vacuum chamber of two corrugated, metallic plates with an adjustable gap. By introducing a small offset in the dechirper with respect to the reference axis, one might generate transverse wakefields and use the dechirper as a deflector. Understanding the interactions between electron beams of various longitudinal shapes with the wakefields generated by...
متن کاملIntroduction to Impedance For Short Relativistic Bunches ?
We will consider the cavity shown in Fig. (2.1) which has rotational symmetry about the z axis and is excited by the beam current, IB, passing through the gap. For the time being, we will consider only one mode of excitation for the cavity; namely, the mode where the magnetic field ~ B is azimuthal around the beam direction as shown. The current IL flows in the outer cavity wall in the directio...
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ژورنال
عنوان ژورنال: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
سال: 2016
ISSN: 0168-9002
DOI: 10.1016/j.nima.2016.02.055