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Title: Coherent synchrotron radiation by electrons moving on circular orbits

Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1369392
Grant/Contract Number:
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 20; Journal Issue: 6; Journal ID: ISSN 2469-9888
Country of Publication:
United States

Citation Formats

Cai, Yunhai. Coherent synchrotron radiation by electrons moving on circular orbits. United States: N. p., 2017. Web. doi:10.1103/PhysRevAccelBeams.20.064402.
Cai, Yunhai. Coherent synchrotron radiation by electrons moving on circular orbits. United States. doi:10.1103/PhysRevAccelBeams.20.064402.
Cai, Yunhai. Thu . "Coherent synchrotron radiation by electrons moving on circular orbits". United States. doi:10.1103/PhysRevAccelBeams.20.064402.
title = {Coherent synchrotron radiation by electrons moving on circular orbits},
author = {Cai, Yunhai},
abstractNote = {},
doi = {10.1103/PhysRevAccelBeams.20.064402},
journal = {Physical Review Accelerators and Beams},
number = 6,
volume = 20,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevAccelBeams.20.064402

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  • Using the framework of quantum field theory in curved spacetime, I analyze the synchrotron scalar radiation emitted by a source orbiting a Schwarzschild black hole in both stable and unstable circular orbits. The comparison between the emitted power in Schwarzschild spacetime and the one obtained in Minkowski spacetime assuming Newtonian gravitation is performed. The amount of the emitted radiation which is absorbed by the black hole is also computed.
  • The space-charge forces for short electron bunches in circular motion can be very different from the space-charge forces for short electron bunches undergoing straight-line motion. The two major effects introduced by the circular motion are an off-axis, so-called {open_quote}{open_quote}noninertial space-charge{close_quote}{close_quote} effect, in which there is essentially no net energy loss of the bunch, and a coherent synchrotron radiation effect, in which the bunch radiates coherent energy. The consequence of these effects is a potentially large growth in the electron bunch{close_quote}s transverse emittance. We derive an expression for these forces from a Green{close_quote}s function approach, starting with the definitions of themore » retarded scalar and vector potentials. In particular, we find an expression for the total electric field along the direction of motion from a short line of charge in circular motion. These expressions in turn can be used in numerical particle simulations to estimate the amount of emittance growth, including the effects of suppressing the coherent synchrotron radiation by reducing the beam pipe dimensions. {copyright} {ital 1996 The American Physical Society.}« less
  • The results of the classical theory relating to the radiation of the electrons which move along a circular path at velocities near to that of light are evaluated from the point of view of using this principle for the generation of the oscillations at wavelengths of the order of 1 mm. A description of miniature experimental synchrotrons having a maximum electron energy of 2.5 Mev is given. The theory was testd by means of this device. The results of the measuremert of the radiated power at several harmonic frequencies in the waveband of 1-3 cm are shown, The limitation ofmore » this method is discussed and the possibility of increasing the radiated power at millimeter wavelengths is indicated. (auth)« less