Coherent control of plasma dynamics by feedback-optimized wavefront manipulationa)

He, Zhaohan; Hou, Bixue; Gao, Ge; Lebailly, V.; Nees, J.; Clarke, Roy; Krushelnick, K.; Thomas, Alexander

doi:10.1063/1.4921159

Cited by 13 publications

(7 citation statements)

References 30 publications

(33 reference statements)

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“…• Genetic algorithm used to collimate a laserproduced electron beam via control of a deformable mirror in the laser chain (cf. He et al [49])…”

Section: Machine-learning Feedback Loopmentioning

confidence: 97%

Development Considerations for High-Repetition-Rate HEDP Experiments

Feister¹,

Poole²,

Heuer³

2019

Preprint

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This paper discusses experimental techniques and considerations associated with the transition to high repetition-rate experiments in High Energy Density Physics (HEDP). We particularly highlight approaches to experimentation that become practical only at a threshold of repetition rate. We focus on the transition from operation at several-shots-per-day towards operation in the range of 1/min. to 1 Hz.

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“…• Genetic algorithm used to collimate a laserproduced electron beam via control of a deformable mirror in the laser chain (cf. He et al [49])…”

Section: Machine-learning Feedback Loopmentioning

confidence: 97%

Development Considerations for High-Repetition-Rate HEDP Experiments

Feister¹,

Poole²,

Heuer³

2019

Preprint

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“…This is similar to the method used by He et al to control the electron energy distribution [21], although in that case the spatial profile was adapted rather than the temporal. By optimizing the signal within a rectangular mask, He et al were able to control the average energy of a continuous electron spectrum by moving the mask along the dispersion direction.…”

Section: B Energy Spectrum Optimizationmentioning

confidence: 99%

“…Applying the same principle to laser wakefield acceleration is a more recent development. He et al successfully optimized various beam parameters, including the charge, divergence, and energy, by adjusting the laser wavefront using a deformable mirror [20,21]. The laser in that case produced pulse energies of 15 mJ at 500 Hz.…”

Section: Introductionmentioning

confidence: 99%

Laser wakefield acceleration with active feedback at 5 Hz

Dann¹,

Baird²,

Bourgeois³

et al. 2019

Phys. Rev. Accel. Beams

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We describe the use of a genetic algorithm to apply active feedback to a laser wakefield accelerator at a higher power (10 TW) and a lower repetition rate (5 Hz) than previous work. The temporal shape of the drive laser pulse was adjusted automatically to optimize the properties of the electron beam. By changing the software configuration, different properties could be improved. This included the total accelerated charge per bunch, which was doubled, and the average electron energy, which was increased from 22 to 27 MeV. Using experimental measurements directly to provide feedback allows the system to work even when the underlying acceleration mechanisms are not fully understood, and, in fact, studying the optimized pulse shape might reveal new insights into the physical processes responsible. Our work suggests that this technique, which has already been applied with low-power lasers, can be extended to work with petawattclass laser systems.

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“…For potential applications of the laser driven ion beams, such as ion implantation of semiconductors, high energy physics, production of radio-isotopes and medical applications [4,5], repetition rates of greater than 10 Hz would ideally be required. In addition to study the stability of the ion beams with a high repetition rate target system, closed loop optimization of various laser diagnostics would be possible [6,7].…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of laser driven protons using a high-repetition-rate tape drive target system

Noaman-ul-Haq

Ahmed

Sokollik

et al. 2017

Phys. Rev. Accel. Beams

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One of the challenges for laser-driven proton beams for many potential applications is their stability and reproducibility. We investigate the stability of the laser driven proton beams through statistical analysis of the data obtained by employing a high repetition rate tape driven target system. The characterization of the target system shows the positioning of the target within ∼15 μm in the focal plane of an off-axis parabola, with less than a micron variation in surface flatness. By employing this stable target system, we study the stability of the proton beams driven by ultrashort and intense laser pulses. Protons with maximum energies of ∼6 AE 0.3 MeV were accelerated for a large number of laser shots taken at a rate of 0.2 Hz with a stability of less than 5% variations in cutoff energy. The development of high repetition rate target system may provide a platform to understand the dynamics of laser driven proton beams at the rate required for future applications.

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Coherent control of plasma dynamics by feedback-optimized wavefront manipulationa)

Cited by 13 publications

References 30 publications

Development Considerations for High-Repetition-Rate HEDP Experiments

Development Considerations for High-Repetition-Rate HEDP Experiments

Laser wakefield acceleration with active feedback at 5 Hz

Statistical analysis of laser driven protons using a high-repetition-rate tape drive target system

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