Enhancement of laser intensity and proton acceleration using micro-tube plasma lens targets

Snyder, Joseph; Ji, Liangliang; Akli, K. U.

doi:10.1063/1.4972577

Cited by 9 publications

(6 citation statements)

References 40 publications

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“…According to the simulation, the electric field just after the laser has left the simulation space indicates a sheath field around 0.8 TV m −1 , similar to expectations for TNSA with a PW class laser (e.g. [55]). It is also worth mentioning that the number of protons and the cutoff should exceed the experimentally observed targets by a small factor given the lower dimensionality of the 2D(3v) simulation and the fact that we do not include effects due to laser pre-pulse in our simulations, which would be important especially when the laser focus is on target.…”

Section: Simulationsupporting

confidence: 75%

MeV proton acceleration at kHz repetition rate from ultra-intense laser liquid interaction

et al. 2018

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We regret overlooking two important citations relevant to the current work, and wish to add these [1, 2]. We also cite [3], which reports crucial experimental parameters pertaining to [1], e.g. chamber pressure during water target experiment. To correct the oversight of missing references, the 4th paragraph of the introduction follows with modified and additional text underlined:Liquid targets have a number of attractive features for meeting these needs. Liquid targets can be rapidly delivered into the interaction region, and mitigate debris [31,[34][35][36]. This is well illustrated by the pioneering research in [1, 3], who, for the first time combined a kHz, femtosecond laser and liquid jet targets with a long-term vision of developing integrated sources of energetic radiation and particles for future applications. They reported the production of 9.25 keV x-rays from the interaction of a kHz, 50 fs pulsed laser interacting with a liquid Ga jet target. They also reported the use of CR39 film to record the production of 500 keV protons from the interaction of the kHz laser with an intensity of 3×10 16 W cm −2 focused on a 10-30μm diameter water jet, with a background chamber pressure of 0.7-3 mbar. The proton production efficiency of 10 −5 % was reported. Prior to switching to the liquid sheet target described in our current work, we attempted to obtain protons from the interaction of 15-30μm diameter water jets with a 40 fs pulsed laser focused to an intensity of 1×10 18 W cm −2 . We recorded many tracks on the CR39 film but, when a magnetic spectrometer was used, all of the tracks were shown to be due to electrons. As noted in this paper, we later discovered that the chamber background pressure required to produce a significant flux of protons was below the freeze point pressure of water.Skip to the end of the last sentence of the paragraph and add as the last sentence of the paragraph: the ability to generate a well collimated proton beam with proton energies greater than 500 keV has recently been demonstrated [2], using a high repetition rate 0.5 kHz, 3 mJ, 55 fs laser interacting with a solid target. The focus intensity was 2×10 18 W cm −2 . A proton beam was generated at the front surface of a rotating optical quality glass disk at a chamber pressure of 3×10 −3 mbar. AbstractLaser acceleration of ions to MeV energies has been achieved on a variety of Petawatt laser systems, raising the prospect of ion beam applications using compact ultra-intense laser technology. However, translation from proof-of-concept laser experiment into real-world application requires MeV-scale ion energies and an appreciable repetition rate (>Hz). We demonstrate, for the first time, proton acceleration up to 2 MeV energies at a kHz repetition rate using a milli-joule-class short-pulse laser system. In these experiments, 5 mJ of ultrashort-pulse laser energy is delivered at an intensity neaŕ -5 10 W cm 18 2 onto a thin-sheet, liquid-density target. Key to this effort is a flowing liquid ethylene glycol target formed i...

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Section: Simulationsupporting

confidence: 75%

MeV proton acceleration at kHz repetition rate from ultra-intense laser liquid interaction

et al. 2018

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“…3a,b). This same enhancement factor was also observed in a similar numerical study by Snyder et al for a higher intensity ( 5 × 10 22 W/cm 2 ) laser pulse 51 . The electrons dragged out of the tube walls provide the primary source of enhancement 24,25 .…”

Section: Resultssupporting

confidence: 87%

A laser parameter study on enhancing proton generation from microtube foil targets

Strehlow

Kim

Bailly-Grandvaux

et al. 2022

Sci Rep

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The interaction of an intense laser with a solid foil target can drive $$\sim$$ ∼ TV/m electric fields, accelerating ions to MeV energies. In this study, we experimentally observe that structured targets can dramatically enhance proton acceleration in the target normal sheath acceleration regime. At the Texas Petawatt Laser facility, we compared proton acceleration from a $$1\, {\upmu }\hbox {m}$$ 1 μ m flat Ag foil, to a fixed microtube structure 3D printed on the front side of the same foil type. A pulse length (140–450 fs) and intensity ((4–10) $$\times 10^{20}$$ × 10 20 W/cm$$^2$$ 2 ) study found an optimum laser configuration (140 fs, 4 $$\times 10^{20}$$ × 10 20 W/cm$$^2$$ 2 ), in which microtube targets increase the proton cutoff energy by 50% and the yield of highly energetic protons ($$>10$$ > 10 MeV) by a factor of 8$$\times$$ × . When the laser intensity reaches $$10^{21}$$ 10 21 W/cm$$^2$$ 2 , the prepulse shutters the microtubes with an overcritical plasma, damping their performance. 2D particle-in-cell simulations are performed, with and without the preplasma profile imported, to better understand the coupling of laser energy to the microtube targets. The simulations are in qualitative agreement with the experimental results, and show that the prepulse is necessary to account for when the laser intensity is sufficiently high.

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“…DLA is superior to surface heating for producing directed, high-energy electrons [46,47]. Its possible advantages for enhancing proton acceleration [34,39] and local laser intensities [38] have been shown in previous simulations. We therefore propose to use micro-sized structures to extend the laser-solid interaction in a highly controlled fashion.…”

Section: Introductionmentioning

confidence: 86%

“…A recent development to enhance the laser-solid interaction is using structured interfaces [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Particularly, nano-wires [32], nano-particles [29], nano-spheres [31] and snowflakes [30] have been proposed to increase the laser absorption efficiency.…”

Section: Introductionmentioning

confidence: 99%

Relativistic laser driven electron accelerator using micro-channel plasma targets

Snyder

George

et al. 2019

Physics of Plasmas

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We present an experimental demonstration of the efficient acceleration of electrons beyond 60 MeV using micro-channel plasma targets. We employed a high-contrast, 2.5 J, 32 fs short pulse laser interacting with a 5 m inner diameter, 300 m long microchannel plasma target. The micro-channel was aligned to be collinear with the incident laser pulse, confining the majority of the laser energy within the channel. The measured electron spectrum showed a large increase of the cut-off energy and slope temperature when compared to that from a 2 m flat Copper target, with the cutoff energy enhanced by over 2.6 times and the total energy in electrons >5 MeV enhanced by over 10 times. Three-dimensional particle-in-cell simulations confirm efficient direct laser acceleration enabled by the novel structure as the dominant acceleration mechanism for the high energy electrons. The simulations further reveal the guiding effect of the channel that successfully explains preferential acceleration on the laser/channel axis observed in experiments. Finally, systematic simulations provide scalings for the energy and charge of the electron pulses. Our results show that the micro-channel plasma target is a promising electron source for applications such as ion acceleration, Bremsstrahlung X-ray radiation, and THZ generation.

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Enhancement of laser intensity and proton acceleration using micro-tube plasma lens targets

Cited by 9 publications

References 40 publications

MeV proton acceleration at kHz repetition rate from ultra-intense laser liquid interaction

MeV proton acceleration at kHz repetition rate from ultra-intense laser liquid interaction

A laser parameter study on enhancing proton generation from microtube foil targets

Relativistic laser driven electron accelerator using micro-channel plasma targets

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