Combined proton acceleration from foil targets by ultraintense short laser pulses

Fang, Yuan; Yu, Tong-Pu; Ge, Xuan; Yang, Su; Wei, Wenqing; Yuan, Tao; Liu, Feng; Chen, Min; Liu, Jingquan; Li, Yutong; Yuan, Xiaohui; Sheng, Zheng-Ming; Zhang, Jie

doi:10.1088/0741-3335/58/4/045025

Cited by 10 publications

(11 citation statements)

References 26 publications

(35 reference statements)

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“…The system parameters of that investigation are not widely dissimilar to the ones in Ref. [31]. It was con- firmed that the number density of CSA protons is small compared to TNSA, even under ideal conditions 3 .…”

Section: Effects Of Target Thicknessmentioning

confidence: 66%

“…Fang et al [31] is, to our knowledge, the first investigation to focus solely on this plateau phenomenon, where the existence of an energy plateau is dependent on the laser intensity contrast. It was found that the higher the contrasts became, the shorter the plateau region, inferring a complex proton generation mechanism at relatively low contrast (10 8 ) and strongly suggesting that pre-plasma plays a major part in this mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Origins of plateau formation in ion energy spectra under target normal sheath acceleration

et al. 2017

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Target normal sheath acceleration (TNSA) is a method employed in laser-matter interaction experiments to accelerate light ions (usually protons). Laser setups with durations of a few 10 fs and relatively low intensity contrasts observe plateau regions in their ion energy spectra when shooting on thin foil targets with thicknesses of order 10 µm. In this paper we identify a mechanism which explains this phenomenon using one dimensional particle-in-cell simulations. Fast electrons generated from the laser interaction recirculate back and forth through the target, giving rise to time-oscillating charge and current densities at the target backside. Periodic decreases in the electron density lead to transient disruptions of the TNSA sheath field: peaks in the ion spectra form as a result, which are then spread in energy from a modified potential driven by further electron recirculation. The ratio between the laser pulse duration and the recirculation period (dependent on the target thickness, including the portion of the pre-plasma which is denser than the critical density) determines if a plateau forms in the energy spectra.

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Section: Effects Of Target Thicknessmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Origins of plateau formation in ion energy spectra under target normal sheath acceleration

et al. 2017

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“…The repetition rate of the laser system is 10 Hz, however, the experiment discussed here, was conducted at 0.2 Hz. In addition to compatible with the target system, this allows sufficient time for effective cooling of the lasing materials, which leads to the stability of the laser beam parameters and focusability [27]. The amplified spontaneous emission contrast (ASE) to the main peak was measured to be 10 −8 at 10 ps by a scanning third-order auto correlator [27].…”

Section: Methodsmentioning

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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“…The contrast of the amplified spontaneous emission (ASE) to the main peak was measured to be 10 -8 at 10 ps using a scanning third-order autocorrelator (Sequoia). 19 Fig. 1 shows a schematic of the experimental setup.…”

Section: Introductionmentioning

confidence: 99%

Periodic spectral modulations of low-energy, low-charge-state carbon ions accelerated in an intense laser–solid interaction

Noaman-ul-Haq

Ahmed

et al. 2018

Physics of Plasmas

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Combined proton acceleration from foil targets by ultraintense short laser pulses

Cited by 10 publications

References 26 publications

Origins of plateau formation in ion energy spectra under target normal sheath acceleration

Origins of plateau formation in ion energy spectra under target normal sheath acceleration

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

Periodic spectral modulations of low-energy, low-charge-state carbon ions accelerated in an intense laser–solid interaction

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