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1 April 1990 Crystal accelerator
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Proceedings Volume 1226, Intense Microwave and Particle Beams; (1990)
Event: OE/LASE '90, 1990, Los Angeles, CA, United States
An ultimate linac structure is realized by an appropriate crystal lattice (superlattice) that serves as a "soft" irised wave guide for x-rays.2 As the energy of accelerated particles increases, the radius of the beam has to decrease inversely proportional to the energy squared if we try to keep the number of events per time constant. This condition becomes very severe beyond the energy in excess of 100 GeV for a single-pass collider. It is in fact, so severe that smallest possible structures, i.e. crystal, have to be utilized for accelerator components. In this sense such an accelerator is the ultimate accelerator. High-energy (40keY) x-rays are injected into the crystal at the Bragg angle to cause Borrmann anomalous transmission, yielding slow-wave accelerating fields. Particles (such as muons) are channeled along the crystal axis. An alternative to injecting x-rays is exciting plasma waves as a wake of particle beams (such as proton or electron beams) injected in the crystal axis. The crystal is cryogenically cooled to avoid the lattice interference and damping. Accelerating fields of x-rays are most likely provided by (i) radiating electrons propagating along the crystal channels (with much lower energies than that of particles to be accelerated), or (ii) preactivated semiconductor or other active solid state medium that is triggered by an incoming pulse of x-ray laser. It is much desired to accomplish self-induced transparency similar to the triple soliton structure.3
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Toshi Tajima, Barry S. Newberger, and M. Cavenago "Crystal accelerator", Proc. SPIE 1226, Intense Microwave and Particle Beams, (1 April 1990);

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