Plasma-Density-Gradient Injection of Low Absolute-Momentum-Spread Electron Bunches

Geddes, C. G. R.; Nakamura, Kei; Plateau, G. R.; Tóth, Csaba; Cormier‐Michel, E.; Esarey, E.; Schroeder, C. B.; Cary, John R.; Leemans, W.P.

doi:10.1103/physrevlett.100.215004

Cited by 359 publications

(253 citation statements)

References 26 publications

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“…Several techniques were also devised in order to control the acceleration processes [16], adjusting the bunch energy, charge [17][18][19][20], and transverse features [21]. Recently, the use of proton drivers was also proposed as a means to accelerate electron beams even further to * 0:5 TeV in & 1 km plasmas [22].…”

Section: Introductionmentioning

confidence: 99%

Polarized beam conditioning in plasma based acceleration

Vieira¹,

Huang

Mori

et al. 2011

Phys. Rev. ST Accel. Beams

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The acceleration of polarized electron beams in the blowout regime of plasma-based acceleration is explored. An analytical model for the spin precession of single beam electrons, and depolarization rates of zero emittance electron beams, is derived. The role of finite emittance is examined numerically by solving the equations for the spin precession with a spin tracking algorithm. The analytical model is in very good agreement with the results from 3D particle-in-cell simulations in the limits of validity of our theory. Our work shows that the beam depolarization is lower for high-energy accelerator stages, and that under the appropriate conditions, the depolarization associated with the acceleration of 100-500 GeV electrons can be kept below 0.1%-0.2%.

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Section: Introductionmentioning

confidence: 99%

Polarized beam conditioning in plasma based acceleration

Vieira¹,

Huang

Mori

et al. 2011

Phys. Rev. ST Accel. Beams

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“…Electrons from a conventional accelerator can be injected into the wakefield, but matching the beam properties to the wakefield size is difficult leading to low efficiency of particle trapping [32]. A number of advanced techniques have been proposed and demonstrated that use density modification [33][34][35], secondary laser beams [36][37][38] or ionization [39][40][41] to greatly simplify injection into the wakefield. But, perhaps the easiest way of injecting high charge beams into the wakefield is through the use of self-injection [24][25][26].…”

Section: Laser Wakefield Accelerationmentioning

confidence: 99%

Compact laser accelerators for X-ray phase-contrast imaging

Najmudin

Kneip

Bloom

et al. 2014

Phil. Trans. R. Soc. A.

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Advances in X-ray imaging techniques have been driven by advances in novel X-ray sources. The latest fourth-generation X-ray sources can boast large photon fluxes at unprecedented brightness. However, the large size of these facilities means that these sources are not available for everyday applications. With advances in laser plasma acceleration, electron beams can now be generated at energies comparable to those used in light sources, but in university-sized laboratories. By making use of the strong transverse focusing of plasma accelerators, bright sources of betatron radiation have been produced. Here, we demonstrate phase-contrast imaging of a biological sample for the first time by radiation generated by GeV electron beams produced by a laser accelerator. The work was performed using a greater than 300 TW laser, which allowed the energy of the synchrotron source to be extended to the 10–100 keV range.

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“…Recently, acceleration to 1 GeV in a few centimeters was demonstrated [20]. In addition, experiments have shown that the quality of the electron beam can be improved by tailoring the plasma density profile in the injection process separately from the accelerating structure [21,22] or by using colliding laser pulses [23].…”

Section: Introductionmentioning

confidence: 99%

Generalized algorithm for control of numerical dispersion in explicit time-domain electromagnetic simulations

Cowan

Bruhwiler

Cary

et al. 2013

Phys. Rev. ST Accel. Beams

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We describe a modification to the finite-difference time-domain algorithm for electromagnetics on a Cartesian grid which eliminates numerical dispersion error in vacuum for waves propagating along a grid axis. We provide details of the algorithm, which generalizes previous work by allowing 3D operation with a wide choice of aspect ratio, and give conditions to eliminate dispersive errors along one or more of the coordinate axes. We discuss the algorithm in the context of laser-plasma acceleration simulation, showing significant reduction-up to a factor of 280, at a plasma density of 10 23 m À3 -of the dispersion error of a linear laser pulse in a plasma channel. We then compare the new algorithm with the standard electromagnetic update for laser-plasma accelerator stage simulations, demonstrating that by controlling numerical dispersion, the new algorithm allows more accurate simulation than is otherwise obtained. We also show that the algorithm can be used to overcome the critical but difficult challenge of consistent initialization of a relativistic particle beam and its fields in an accelerator simulation.

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Plasma-Density-Gradient Injection of Low Absolute-Momentum-Spread Electron Bunches

Cited by 359 publications

References 26 publications

Polarized beam conditioning in plasma based acceleration

Polarized beam conditioning in plasma based acceleration

Compact laser accelerators for X-ray phase-contrast imaging

Generalized algorithm for control of numerical dispersion in explicit time-domain electromagnetic simulations

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