MeV electron acceleration at 1  kHz with &lt;10  mJ laser pulses

Salehi, Fatholah; Goers, Andy; Hine, George; Feder, Linus; Kuk, Donghoon; Miao, Bo; Woodbury, Daniel; Kim, Ki-Yong; Milchberg, H. M.

doi:10.1364/ol.42.000215

Cited by 85 publications

(40 citation statements)

References 21 publications

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“…The target at focus (right) is perturbed −6.13 ns before the main pulse interaction from which more numerous and energetic electrons escape, and the ion acceleration is suppressed. peak focus as one would expect if the target density in the interaction region is decreased to near or less-than critical density due to the short-pulse replica interaction [59].…”

Section: Discussionmentioning

confidence: 85%

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: Discussionmentioning

confidence: 85%

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

et al. 2018

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“…A more recent line of research is currently focusing on the development of high-repetition rate (100 Hz-kHz) LPAs producing lower energy beams and requiring more modest laser parameters. TW-scale and kilohertz lasers with few-mJ pulse energy are capable of generating few MeV, pC range electrons beams [6][7][8][9] with femtosecond durations. Such beams could be used for lowenergy applications such as ultrafast electron diffraction [10,11] or irradiation of biological samples [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…A LPA running at kHz or faster will provide more stable beams with higher average currents and will permit the implementation of active feed-back loops to further stabilize the performance of the accelerator. Indeed, existing multi-mJ kHz laser systems are now able to provide laser pulses compressed to almost single-cycle wave packets, and with tight focusing, intensities in excess of I ≈ 1 × 10 18 W/cm 2 can be obtained, which is suitable for driving a LPA [14][15][16][17][18] . Due to such tight focusing, the acceleration length is typically short (few tens of micrometers), and the LPA electron energies are on the order of a few MeVs.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of stable long-term operation of a kilohertz laser-plasma accelerator

Rovige

Huijts

Andriyash

et al. 2020

Phys. Rev. Accel. Beams

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We report on the stable and continuous operation of a kilohertz laser-plasma accelerator. Electron bunches with 2.6 pC charge and 2.5 MeV peak energy were generated via injection and trapping in a downward plasma density ramp. This density transition was produced in a specially designed asymmetrically shocked gas jet. The reproducibility of the electron source was also assessed over a period of a week and found to be satisfactory with similar values of the beam charge and energy. Particle in cell simulations confirm the role of the shock and the density transition in the electron injection mechanism. These results show that the reproducibility and stability of the laser-plasma accelerator are greatly enhanced on the long-term scale when using a robust scheme for density gradient injection.

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“…As electron injection relies mostly on the self-injection scheme triggered by the extreme nonlinear behavior of the plasma waves such as wave breaking 9 , 10 and plasma wave expansion 11 , it is difficult to control the injected charge, energy spread, and injection position in LWFA. Furthermore, the electron self-injection can be a critical issue in high-repetition-rate LWFA as the available laser intensity is limited because of technological constraints 12 , 13 . To overcome the limitations of self-injection, various electron injection methods have been proposed using colliding laser pulses 14 – 17 , density gradients 7 , 18 , 19 , inner-shell ionization 16 , 20 , 21 , and external magnetic fields 22 .…”

Section: Introductionmentioning

confidence: 99%

Controlled electron injection facilitated by nanoparticles for laser wakefield acceleration

Cho

Pathak

Kim

et al. 2018

Sci Rep

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We propose a novel injection scheme for laser-driven wakefield acceleration in which controllable localized electron injection is obtained by inserting nanoparticles into a plasma medium. The nanoparticles provide a very confined electric field that triggers localized electron injection where nonlinear plasma waves are excited but not sufficient for background electrons self-injection. We present a theoretical model to describe the conditions and properties of the electron injection in the presence of nanoparticles. Multi-dimensional particle-in-cell (PIC) simulations demonstrate that the total charge of the injected electron beam can be controlled by the position, number, size, and density of the nanoparticles. The PIC simulation also indicates that a 5-GeV electron beam with an energy spread below 1% can be obtained with a 0.5-PW laser pulse by using the nanoparticle-assisted laser wakefield acceleration.

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MeV electron acceleration at 1 kHz with <10 mJ laser pulses

Cited by 85 publications

References 21 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

Demonstration of stable long-term operation of a kilohertz laser-plasma accelerator

Controlled electron injection facilitated by nanoparticles for laser wakefield acceleration

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