Optimization and stabilization of a kilohertz laser-plasma accelerator
Lucas Rovige,Julius Huijts,Igor Andriyash,Aline Vernier,Marie Ouillé,Zhao Cheng,T. Asai,Y. Fukuda,Vidmantas Tomkus,Valdas Girdauskas,Gediminas Račiukaitis,Juozas Dudutis,Valdemar Stankevič,Paulius Gečys,Rodrigo Lopez-Martens,Jérôme Faure +15 more
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TLDR
In this paper, the authors present a systematic study in which a large range of pulse durations and plasma densities were investigated through continuous tuning of the laser spectral bandwidth, and two laser-plasma accelerator (LPA) processes can be distinguished, where beams of the highest quality, with a charge of 5.4 pC and a spectrum peaked at 2.5Abstract:
Laser–plasma acceleration at kilohertz repetition rates has recently been shown to work in two different regimes with pulse lengths of either 30 fs or 3.5 fs. We now report on a systematic study in which a large range of pulse durations and plasma densities were investigated through continuous tuning of the laser spectral bandwidth. Indeed, two laser–plasma accelerator (LPA) processes can be distinguished, where beams of the highest quality, with a charge of 5.4 pC and a spectrum peaked at 2–2.5 MeV, are obtained with short pulses propagating at moderate plasma densities. Through particle-in-cell (PIC) simulations, the two different acceleration processes are thoroughly explained. Finally, we proceed to show the results of a 5-h continuous and stable run of our LPA accelerator accumulating more than 18 × 10 6 consecutive shots, with a charge of 2.6 pC and a peaked 2.5 MeV spectrum. A parametric study of the influence of the laser driver energy through PIC simulations underlines that this unprecedented stability was obtained thanks to micro-scale density gradient injection. Together, these results represent an important step toward stable laser–plasma accelerated electron beams at kilohertz repetition rates.read more
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Beyond optimization -- supervised learning applications in relativistic laser-plasma experiments
Jinpu Lin,Qian Qian,Jon Murphy,Abigail Hsu,Yong Ma,Alfred O. Hero,Alexander Thomas,Karl Krushelnick +7 more
TL;DR: In this article, the beam charge of electrons produced in a laser wakefield accelerator given the laser wavefront change caused by a deformable mirror is predicted using machine learning techniques beyond optimization purposes.
Journal ArticleDOI
Beyond optimization—supervised learning applications in relativistic laser-plasma experiments
Jinpu Lin,Qian Qian,Jon Murphy,Abigail Hsu,Alfred O. Hero,Yong Ma,Alexander Thomas,Karl Krushelnick +7 more
TL;DR: In this paper, the beam charge of electrons produced in a laser wakefield accelerator is predicted given the laser wavefront change caused by a deformable mirror, which reveals more information than the genetic algorithms and the statistical correlation do.
Journal ArticleDOI
Extreme laser pulse-energy measurements by means of photon momentum.
Paul A. Williams,Kyle A. Rogers,Martin Divoky,Geiland Porrovecchio,Jiři Tesař,Marek Smid,John H. Lehman +6 more
TL;DR: In this article , a radiation pressure energy meter with a charge integrator photodiode was used to measure the energy of a 1-kW average power laser source with a force-sensing mirror configuration.
Journal ArticleDOI
Carrier-Envelope-Phase-Controlled Acceleration of Multicolored Attosecond Electron Bunches in a Millijoule-Laser-Driven Wakefield
Guo-Bo Zhang,Min Chen,De-Bin Zou,Xin Zhu,Boyuan Li,Xiao-Hu Yang,Feng Liu,Tong-Pu Yu,Yantong Ma,Zheng-Ming Sheng +9 more
TL;DR: In this paper , the authors proposed a scheme to generate multicolor electron bunches with a laser wakefield accelerator driven by a millijoule few-cycle laser pulse via carrier-envelope-phase (CEP)-controlled ionization injection.
Proceedings ArticleDOI
Carrier-Envelope Phase Controlled Electron Dynamics in a Laser-Wakefield Accelerator
J. V. Huijts,Lucas Rovige,Jos'ephine Monzac,Igor Andriyash,Aline Vernier,Marie Ouillé,Jaismeen Kaur,Zhao Cheng,Rodrigo Lopez-Martens,Jérôme Faure +9 more
TL;DR: In this article , the first observation and control of carrier-envelope phase effects in Laser Wakefield Acceleration was reported. And these effects imply the breakdown of the cycle-averaged ponderomotive approximation and are explained through highly localized off-axis electron injection.
References
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Laser Electron Accelerator
Toshiki Tajima,John M. Dawson +1 more
TL;DR: In this paper, an intense electromagnetic pulse can create a weak of plasma oscillations through the action of the nonlinear ponderomotive force, and electrons trapped in the wake can be accelerated to high energy.
Journal ArticleDOI
A laser-plasma accelerator producing monoenergetic electron beams
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TL;DR: It is demonstrated that this randomization of electrons in phase space can be suppressed and that the quality of the electron beams can be dramatically enhanced.
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High-quality electron beams from a laser wakefield accelerator using plasma-channel guiding
C. G. R. Geddes,C. G. R. Geddes,Cs. Toth,van J Jeroen Tilborg,van J Jeroen Tilborg,Eric Esarey,Carl Schroeder,David L. Bruhwiler,Chet Nieter,John R. Cary,Wim Leemans +10 more
TL;DR: A laser accelerator that produces electron beams with an energy spread of a few per cent, low emittance and increased energy (more than 109 electrons above 80 MeV) and opens the way for compact and tunable high-brightness sources of electrons and radiation.
Journal ArticleDOI
Monoenergetic beams of relativistic electrons from intense laser–plasma interactions
Stuart Mangles,C. D. Murphy,C. D. Murphy,Zulfikar Najmudin,Alexander Thomas,John Collier,A. E. Dangor,E. J. Divall,Peta Foster,J. G. Gallacher,C. J. Hooker,Dino A. Jaroszynski,A. J. Langley,Warren Mori,Peter Norreys,Frank Tsung,R. Viskup,B. Walton,Karl Krushelnick +18 more
TL;DR: High-resolution energy measurements of the electron beams produced from intense laser–plasma interactions are reported, showing that—under particular plasma conditions—it is possible to generate beams of relativistic electrons with low divergence and a small energy spread.
Journal ArticleDOI
Laser wake field acceleration: the highly non-linear broken- wave regime
TL;DR: In this paper, the authors used three-dimensional particle-in-cell simulations to study laser wake field acceleration (LWFA) at highly relativistic laser intensities, and observed ultra-short electron bunches emerging from laser wake fields driven above the wave-breaking threshold by few-cycle laser pulses shorter than the plasma wavelength.