Disruption, beamstrahlung, and beamstrahlung pair creation
Abstract
The two major effects from the interaction of e/sup /minus//e/sup +/ beamsbeamstrahlung and disruptionare 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 beambeam effects, we also list the relevant beambeam 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):
 SLACPUB4822; CONF880624331
ON: DE89007542
 DOE Contract Number:
 AC0376SF00515
 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; BEAMBEAM INTERACTIONS; BEAM DYNAMICS; STANFORD LINEAR COLLIDER; BEAM LUMINOSITY; BREMSSTRAHLUNG; COMPUTERIZED SIMULATION; CROSS SECTIONS; ELECTRONPOSITRON INTERACTIONS; KINK INSTABILITY; SCALING LAWS; SPECTRAL FUNCTIONS; ACCELERATOR FACILITIES; ACCELERATORS; ELECTROMAGNETIC RADIATION; FUNCTIONS; INSTABILITY; INTERACTIONS; LEPTONLEPTON 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 +/ beamsbeamstrahlung and disruptionare 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 beambeam effects, we also list the relevant beambeam 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}
}

The final electron energy spectrum under multiphoton 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.

An introduction to beamstrahlung and disruption
In this lecture we review the current understanding of the beambeam interaction in e/sup +/e/sup / linear colliders. Strictly speaking, the two effects, disruption and beamstrahlung, during beambeam interaction are coupled. This is selfevident 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 » 
Electronpositron pair annihilation and creation in superstrong magnetic fields
The paper reviews the results obtained so far in recalculating the processes of onephoton and twophoton 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. 
Coherent pair creation as a positron source for linear colliders
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 pairproduced 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.