Particle dynamics and its consequences in wakefield acceleration in a high energy collider Page: 4 of 13
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Particle Dynamics and its Consequences
in Wakefield Acceleration in a High
S. Cheshkov, T. Tajima, W. Horton and K. Yokoya*
Department of Physics and Institute for Fusion Studies
The University of Texas at Austin
Austin, Texas 78712 USA
* KEK National Laboratory for High Energy Physics, Japan
Abstract. The performance of a wakefield accelerator in a high energy collider appli-
cation is analyzed by use of a nonlinear dynamics map built on a simple theoretical
model of the wakefield generated by the laser pulse (or whatever other method) and a
code based on this map .The crucial figures of merit for such a system other than the
final energy include the emittance (that determines the luminosity). The more complex
the system is, the more "opportunities" the system has to degrade the emittance (or
entropy of the beam). Thus our map guides us to identify where the crucial elements
lie that affect the emittance. If the focusing force of the wakefield is strong when there
is a jitter in the position (or laser aiming) of each stage coupled with the spread in
the individual particle betatron frequencies, particles experience a phase space mixing.
This effect sensitively controls the emittance degradation. We investigate these effects
both in a uniform plasma and in a plasma channel. We also study the effect of beam
loading. Further, we briefly consider collision point physics issues for a collider ex-
pected or characteristic of such a construction based on a scenario for the multi-staged
The use of plasma waves excited by laser beams for electron acceleration was
proposed by Tajima and Dawson . There are many possible applications of
plasma based accelerators and one of them, perhaps the most challenging, is for
construction of a linear collider. It is believed that conventional linear colliders
can go up to 1 TeV center of mass energy of colliding particles . However,
beyond that probably some new technology needs to enter. A feature of plasma
based accelerators is their ability to sustain extremely large acceleration gradients
(~ 100 GV/m ). Correspondingly we can hope to achieve high energy gains on
short distance. Such a machine, no doubt, consists of a large number of elements
to reach for a desired energy and forms a complex system. In order to identify the
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Cheshkov, S.; Tajima, T.; Horton, W. & Yokoya, K. Particle dynamics and its consequences in wakefield acceleration in a high energy collider, report, September 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc707514/m1/4/: accessed January 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.