Thermal scaling laws of the optical Bragg acceleration structure

Karagodsky, Vadim; Mizrahi, Amit; Schächter, Levi

doi:10.1103/physrevstab.9.051301

Cited by 8 publications

(8 citation statements)

References 52 publications

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“…Optical fields may have a significant effect on the acceleration structure via thermal processes if the optical energy is absorbed by the dielectric and causes expansion (Karagodsky et al, 2006). For a planar optical Bragg acceleration structure, the temperature distribution is determined by the 1-D steady state diffusion.…”

Section: Thermal Considerationsmentioning

confidence: 99%

Dielectric laser accelerators

England¹,

Noble²,

Bane³

et al. 2014

Rev. Mod. Phys.

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341

184

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The use of infrared lasers to power optical-scale lithographically fabricated particle accelerators is a developing area of research that has garnered increasing interest in recent years. We review the physics and technology of this approach, which we refer to as dielectric laser acceleration (DLA). In the DLA scheme operating at typical laser pulse lengths of 0.1 to 1 ps, the laser damage fluences for robust dielectric materials correspond to peak surface electric fields in the GV/m regime. The corresponding accelerating field enhancement represents a potential reduction in active length of the accelerator between 1 and 2 orders of magnitude. Power sources for DLA-based accelerators (lasers) are less costly than microwave sources (klystrons) for equivalent average power levels due to wider availability and private sector investment. Due to the high laser-to-particle coupling efficiency, required pulse energies are consistent with tabletop microJoule class lasers. Combined with the very high (MHz) repetition rates these lasers can provide, the DLA approach appears promising for a variety of applications, including future high energy physics colliders, compact light sources, and portable medical scanners and radiative therapy machines.

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Section: Thermal Considerationsmentioning

confidence: 99%

Dielectric laser accelerators

England¹,

Noble²,

Bane³

et al. 2014

Rev. Mod. Phys.

Self Cite

341

184

View full text Add to dashboard Cite

show abstract

“…Similar ultralow losses are achievable in communication fibers with attenuation 0:15 dB=km [17]. Such losses were also assumed in [18] in the study of thermal effects for the optical Bragg accelerator.…”

Section: Nonideal Dielectrics and Radiation Absorptionmentioning

confidence: 77%

Particle acceleration by wave scattering off dielectric spheres at whispering-gallery-mode resonance

Żakowicz

2007

Phys. Rev. ST Accel. Beams

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The large electromagnetic fields, created in wave scattering near a perfect dielectric sphere at the condition of whispering-gallery-mode resonances, are investigated as driving units for high energy charged particle accelerators. For optimal trajectories passing near the scattering sphere, particle coupling with the field reduces to very short intervals, of the order of the wave period. Interacting fields can be almost 1000 times stronger than that in the incident wave. An example considered indicates that the instantaneous energy yield during this strong coupling interval is equivalent to 30 GeV=m, assuming the incident electric field E 0 100 MV=m. It was shown that the particle transverse deflection is negligible if the phase of the particle is optimal for acceleration. Hence, the acceleration process can be repeated many times. A rough estimate of the energy gain in a periodic chain of such elementary accelerating unit cells gives Energy=m 5 GeV=m, which is several hundred times more than in contemporary operating and projected accelerators. Preliminary estimates of absorption losses in the scheme are given.

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“…Lithography, which would result in planar structures, and optical fiber drawing are manufacturing techniques that seem well suited for such laser driven structures that have typical dimensions of a few microns. Recently, it was demonstrated that optical Bragg acceleration structures [30,71,72], either planar or cylindrical, designed specifically for the speed-of-light transverse magnetic (TM) mode and having typical dimensions of a few microns exhibit high performance as acceleration structures, and accordingly, seem to be promising candidates for future optical accelerators.…”

Section: Optical Bragg Acceleratorsmentioning

confidence: 99%

“…For compensating the low current mentioned, it is possible to "stack" several units one on top of the other. Since for good confinement it is usually sufficient to have about 20 layers [30] on Heat dissipation may become a serious impediment since typically it is limited to less than 2 kW/cm 2 -for a more detailed discussion see [72]. Injecting electrons in an acceleration structure in the presence of an accelerating mode (phase-velocity c) does not ensure acceleration.…”

Section: Implication On Medical Acceleratorsmentioning

confidence: 99%

PASER – particle acceleration by stimulated emission of radiation: theory, experiment, and future applications

Banna¹,

Mizrahi

Schächter

2009

Laser & Photonics Reviews

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We review the theory and the experimental demonstration of one of the novel advanced particle acceleration techniques dubbed PASER -for particle acceleration by stimulated emission of radiation. In such an acceleration paradigm, bundles of electrons are accelerated using the same principle as in laser. A proof-of-principle experiment, conducted at the Brookhaven National Laboratory, demonstrated this novel acceleration scheme. A 45 MeV electron macrobunch was modulated by a high-power CO2 laser in a wiggler, and then injected into an excited CO2 gas mixture. The emerging microbunches reveal a 0.15% relative change in the kinetic energy in less than 40 cm long interaction region. This is the first experimental demonstration of coherent collisions of the second kind. The fundamental physics underlying the PASER paradigm is discussed via the analysis of a two-dimensional analytic model used to evaluate the energy exchange occurring as a train of electron microbunches traverses an active medium. Furthermore, advanced PASER concepts such as non-linear interaction of electrons and waves in an active medium, the occurrence of resonant absorption instability, and PASER-based optical Bragg accelerators, are considered as well. The possible impact of PASER-based accelerators on future compact medical accelerators, and on high-energy physics applications is discussed.Light-electron-atom interaction. (a) The Franck-Hertz experiment -collision of the first kind. (b) The Latyscheff-Leipunsky experiment -collision of the second kind. (c) LASER -light amplification by stimulated emission of radiation. Photons coherent multiple collisions. (d) PASER -particle acceleration by stimulated emission of radiation. Coherent collisions of the second kind. Reprinted with permission from [49].

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Thermal scaling laws of the optical Bragg acceleration structure

Cited by 8 publications

References 52 publications

Dielectric laser accelerators

Dielectric laser accelerators

Particle acceleration by wave scattering off dielectric spheres at whispering-gallery-mode resonance

PASER – particle acceleration by stimulated emission of radiation: theory, experiment, and future applications

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