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Laser-Wakefield Accelerators: Glass-Guiding Benefits, Donald P. Umstadter
Laser-Wakefield Accelerators: Glass-Guiding Benefits, Donald P. Umstadter
Donald Umstadter Publications
A main attraction of laser-driven electron accelerators is their absence of cavity walls, which can break down in the presence of intense electric fields. Now it seems that the inclusion of a hollow glass fibre cavity could lead to more efficient acceleration at lower laser intensities. ... Further research will reveal which of the above methods for guiding light will ultimately prove best for future accelerator designs. In any case, although it is perhaps ironic that the relatively old technology of glass waveguides may benefit next-generation accelerators, it is nonetheless satisfying to see such a classic photonic solution come to …
Background-Free, Quasi-Monoenergetic Electron Beams From A Self-Injected Laser Wakefield Accelerator, Sudeep Banerjee, Serguei Y. Kalmykov, Nathan D. Powers, Viswanathan Ramanathan, Nathan A. Chandler-Smith, Kevin J. Brown, Shuo Chen, A. Moorthi, I. Ghebregziabher, C. Maharjan, Bradley Allan Shadwick, Donald Umstadter, A. Beck, E. Lefebvre, A. Cowan, D. Bruhwiler
Background-Free, Quasi-Monoenergetic Electron Beams From A Self-Injected Laser Wakefield Accelerator, Sudeep Banerjee, Serguei Y. Kalmykov, Nathan D. Powers, Viswanathan Ramanathan, Nathan A. Chandler-Smith, Kevin J. Brown, Shuo Chen, A. Moorthi, I. Ghebregziabher, C. Maharjan, Bradley Allan Shadwick, Donald Umstadter, A. Beck, E. Lefebvre, A. Cowan, D. Bruhwiler
Donald Umstadter Publications
Stable 200–400-MeV quasi-monoenergetic electron bunches (ΔE/Eno dark-currentare produced when a self-injected laser plasma accelerator is optimized. PIC simulations demonstrate these beams are produced near the threshold for selfinjection.
Electron Self-Injection Into An Evolving Plasma Bubble: Quasi-Monoenergetic Laser-Plasma Acceleration In The Blowout Regime, Serguei Y. Kalmykov, A. Beck, S. A. Yi, V. N. Khudik, Michael C. Downer, E. Lefebvre, Bradley Allan Shadwick, Donald Umstadter
Electron Self-Injection Into An Evolving Plasma Bubble: Quasi-Monoenergetic Laser-Plasma Acceleration In The Blowout Regime, Serguei Y. Kalmykov, A. Beck, S. A. Yi, V. N. Khudik, Michael C. Downer, E. Lefebvre, Bradley Allan Shadwick, Donald Umstadter
Donald Umstadter Publications
An electron density bubble driven in a rarefied uniform plasma by a slowly evolving laser pulse goes through periods of adiabatically slow expansions and contractions. Bubble expansion causes robust self-injection of initially quiescent plasma electrons, whereas stabilization and contraction terminate self-injection thus limiting injected charge; concomitant phase space rotation reduces the bunch energy spread. In regimes relevant to experiments with hundred terawatt- to petawatt-class lasers, bubble dynamics and, hence, the self-injection process are governed primarily by the driver evolution. Collective transverse fields of the trapped electron bunch reduce the accelerating gradient and slow down phase space rotation. Bubble expansion followed …