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Diffraction Transition Radiation from Periodic Electron Bunches

1987
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Release : 1987
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Book Synopsis Diffraction Transition Radiation from Periodic Electron Bunches by : Young Moon Lee

Download or read book Diffraction Transition Radiation from Periodic Electron Bunches written by Young Moon Lee. This book was released on 1987. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the first lobe of diffraction transition radiation from a hole in a thin aluminum foil for electron-beam energies of 32.9 MeV and 63.3 MeV has been made. The effect of the hole size was investigated using radii of 3 cm, 5 cm, and 7 cm. Although the measured peak angle and intensity are not well matched to the theoretical values, these experiments attempt to isolate the diffraction transition radiation from Cerenkov radiation and transition radiation. The normalization of the detected signal to the beam current was tried for compensation of the beam fluctuation. Conclusive results have not yet been obtained, but this investigation provides directions for future experiments. Keywords: Diffraction transition radiation; Transition radiation; Cerenkov radiation; Normalization.

Diffraction Effects in Coherent Transition Radiation Diagnostics for Sub-mm Bunch Length Measurement

2008
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Release : 2008
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Book Synopsis Diffraction Effects in Coherent Transition Radiation Diagnostics for Sub-mm Bunch Length Measurement by :

Download or read book Diffraction Effects in Coherent Transition Radiation Diagnostics for Sub-mm Bunch Length Measurement written by . This book was released on 2008. Available in PDF, EPUB and Kindle. Book excerpt: Electrons crossing the boundary between different media generate bursts of transition radiation. In the case of bunches of N electrons, the radiation is coherent and has an N-squared enhancement at wavelengths related to the longitudinal bunch distribution. This coherent transition radiation has therefore attracted attention as an interceptive charged particle beam diagnostic technique. Many analytical descriptions have been devised describing the spectral distribution generated by electron bunches colliding with thin metallic foils making different simplifying assumptions. For typical bunches having lengths in the sub-millimeter range, measurable spectra are generated up into the millimeter range. Analysis of this THz radiation is performed using optical equipment tens of millimeters in size. This gives rise to concern that optical diffraction effects may spread the wavefront of interest into regions larger than the optical elements and partially escape detection, generating a wavelength-dependent instrument response. In this paper we present a model implementing vector diffraction theory to analyze these effects in bunch length diagnostics based on coherent transition radiation.

Diffraction Radiation from Relativistic Particles

2010-10-05 Science
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Release : 2010-10-05
Genre : Science
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Book Rating : 131/5 ( reviews)

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Book Synopsis Diffraction Radiation from Relativistic Particles by : Alexander Potylitsyn

Download or read book Diffraction Radiation from Relativistic Particles written by Alexander Potylitsyn. This book was released on 2010-10-05. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with diffraction radiation, which implies the boundary problems of electromagnetic radiation theory. Diffraction radiation is generated when a charged particle moves near a target edge at a distance ( – Lorentz factor, – wave length). Diffraction radiation of non-relativistic particles is widely used to design intense emitters in the cm wavelength range. Diffraction radiation from relativistic charged particles is important for noninvasive beam diagnostics and design of free electron lasers based on Smith-Purcell radiation which is diffraction radiation from periodic structures. Different analytical models of diffraction radiation and results of recent experimental studies are presented in this book. The book may also serve as guide to classical electrodynamics applications in beam physics and electrodynamics. It can be of great use for young researchers to develop skills and for experienced scientists to obtain new results.

Diffraction Radiation from Relativistic Electron Bunches

1986
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Release : 1986
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Book Synopsis Diffraction Radiation from Relativistic Electron Bunches by : Michael J. Gallet

Download or read book Diffraction Radiation from Relativistic Electron Bunches written by Michael J. Gallet. This book was released on 1986. Available in PDF, EPUB and Kindle. Book excerpt: Diffraction radiation is that electromagnetic energy which is caused by a relativistic charged particle passing through an aperture in an opaque material. Ter-Mikaelian solved for the diffraction radiation from a point charge. This paper discusses the phenomena resulting from finite, relativistic charge bunches. Using the Huygens Fresnel principle, diffraction patterns from spherical and cylindrical charge distributions are found and plotted. For charge bunch sizes less than the radiation wavelength, the results are almost identical to those for point charges. The radiation pattern is composed of two regions. The transition region is characterized by a strong peak at theta = 1/gamma, the Lorentz factor. The diffraction region consists of a series of peaks and nulls in field strength typical of the standard plane wave diffraction pattern. (Theses).

Vector Diffraction Theory and Coherent Transition Radiation Interferometry in Electron Linacs

2007
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Release : 2007
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Book Synopsis Vector Diffraction Theory and Coherent Transition Radiation Interferometry in Electron Linacs by :

Download or read book Vector Diffraction Theory and Coherent Transition Radiation Interferometry in Electron Linacs written by . This book was released on 2007. Available in PDF, EPUB and Kindle. Book excerpt: Electrons impinging on a thin metallic foil produce small bursts of transition radiation (TR) as they cross the boundary from one medium to the next. A popular diagnostic application is found for compact electron bunches. In this case they will emit radiation more or less coherently with an enhancement of the intensity on wavelengths comparable to or larger than the bunch size, generating coherent transition radiation (CTR). Several detailed analytical descriptions have been proposed for describing the resulting spectral distribution, often making different simplifying assumptions. Given that bunches tenths of millimeters long can generate measurable spectra into the millimeter range, concern may arise as to weak diffraction effects produced by optical interference devices containing elements with dimensions in the centimeter range.

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