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Title: Disruption, beamstrahlung, and beamstrahlung pair creation

Abstract

The two major effects from the interaction of e/sup /minus//e/sup +/ beams---beamstrahlung and disruption---are reviewed, with emphasis on flat beam collisions. For the disruption effects we discuss the luminosity enhancement factor, the maximum and rms disruption angles, and the ''kink instability''. All the results are obtained from computer simulations, and scaling laws based on these are deduced whenever possible. For the beamstrahlung effects, we concentrate only on the final electron energy spectrum and the deflection angle associated with low energy particles. In addition to the generic studies on the beam-beam effects, we also list the relevant beam-beam parameters obtained from simulations on two sample designs: the TLC and the ILC. As an addendum, the newly discovered phenomenon of coherent beamstrahlung pair creation, together with the incoherent process, are discussed. 18 refs., 15 figs., 1 tab.

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, Menlo Park, CA (USA)
OSTI Identifier:
6402428
Report Number(s):
SLAC-PUB-4822; CONF-8806243-31
ON: DE89007542
DOE Contract Number:
AC03-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: DPF summer study: Snowmass '88 on high energy physics in the 1990s, Snowmass, CO, USA, 27 Jun 1988; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM-BEAM INTERACTIONS; BEAM DYNAMICS; STANFORD LINEAR COLLIDER; BEAM LUMINOSITY; BREMSSTRAHLUNG; COMPUTERIZED SIMULATION; CROSS SECTIONS; ELECTRON-POSITRON INTERACTIONS; KINK INSTABILITY; SCALING LAWS; SPECTRAL FUNCTIONS; ACCELERATOR FACILITIES; ACCELERATORS; ELECTROMAGNETIC RADIATION; FUNCTIONS; INSTABILITY; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; LINEAR ACCELERATORS; PARTICLE INTERACTIONS; PLASMA INSTABILITY; PLASMA MACROINSTABILITIES; RADIATIONS; SIMULATION; 430200* - Particle Accelerators- Beam Dynamics, Field Calculations, & Ion Optics

Citation Formats

Chen, P. Disruption, beamstrahlung, and beamstrahlung pair creation. United States: N. p., 1988. Web.
Chen, P. Disruption, beamstrahlung, and beamstrahlung pair creation. United States.
Chen, P. Thu . "Disruption, beamstrahlung, and beamstrahlung pair creation". United States. doi:. https://www.osti.gov/servlets/purl/6402428.
@article{osti_6402428,
title = {Disruption, beamstrahlung, and beamstrahlung pair creation},
author = {Chen, P.},
abstractNote = {The two major effects from the interaction of e/sup /minus//e/sup +/ beams---beamstrahlung and disruption---are reviewed, with emphasis on flat beam collisions. For the disruption effects we discuss the luminosity enhancement factor, the maximum and rms disruption angles, and the ''kink instability''. All the results are obtained from computer simulations, and scaling laws based on these are deduced whenever possible. For the beamstrahlung effects, we concentrate only on the final electron energy spectrum and the deflection angle associated with low energy particles. In addition to the generic studies on the beam-beam effects, we also list the relevant beam-beam parameters obtained from simulations on two sample designs: the TLC and the ILC. As an addendum, the newly discovered phenomenon of coherent beamstrahlung pair creation, together with the incoherent process, are discussed. 18 refs., 15 figs., 1 tab.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 1988},
month = {Thu Dec 01 00:00:00 EST 1988}
}

Conference:
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  • The final electron energy spectrum under multi-photon beamstrahlung process is derived analytically in the classical and the intermediate regimes. The maximum disruption angle from the low energy tail of the spectrum is also estimated. The results are then applied to the TLC and the CLIC parameters. 6 refs., 1 fig., 1 tab.
  • In this lecture we review the current understanding of the beam-beam interaction in e/sup +/e/sup -/ linear colliders. Strictly speaking, the two effects, disruption and beamstrahlung, during beam-beam interaction are coupled. This is self-evident because without deflection there would be no radiation, and with radiation during bending the remaining trajectory of particles would not be the same. Fortunately, in a large range of beam parameters the average disruption angles are rather small, and the emission of hard photons are relatively rare. For these reasons the two effects can be isolated from each other to the first degree of accuracy, andmore » our study of the issue can be greatly simplified. This happens also to be the development historically. We discuss the effects associated with disruption with negligible beamstrahlung. Here, an important parameter, the disruption parameter D, is introduced. We then discuss the maximum and rms disruption angles. The analytic scaling laws for D >> 1 and D << 1 are then compared with simulation results. Next we investigate the enhancement of luminosity due to disruption. Together with the aspect ratio R identical to sigma/sub x//sigma/sub y/, the two parameters define a scaling law for luminosity enhancement, H/sub D1/, due to the mutual pinching of the e/sup +/e/sup -/ bunches where the effective beam size sigma/sub x/sigma/sub y/ is reduced. Next we discuss beamstrahlung with negligible disruption. First we review the nature of beamstrahlung by describing the novel features of the problem. These specific features are then compared with the known radiation phenomena with emphasis on their similarities and differences. 36 refs.« less
  • The paper reviews the results obtained so far in recalculating the processes of one-photon and two-photon pair annihilation and creation in strong magnetic fields (B approx. 10/sup 11/ -10/sup 13/ G, as are characteristic of neutron stars), with special emphasis being laid on annihilation. 5 references, 4 figures.
  • We propose a positron source for future linear colliders which uses the mechanism of coherent pair creation process from the collision of a high energy electron beam and a monochromatic photon beam. We show that there is a sharp spike in the pair-produced positron energy spectrum at an energy much lower than the primary beam energy. The transverse emittance is damped'', yielding final positrons with lower normalized emittance than the initial electrons. Numerical examples invoking conventional lasers and Free Electron Lasers (FEL) for the photon beams are considered.