Acceleration of high charge-state target ions in high-intensity laser interactions with sub-micron targets

McGuffey, C.; Raymond, A.; Batson, Thomas; Hua, Rui; Petrov, G. M.; Kim, J.; Krauland, C.; Maksimchuk, A.; Thomas, Alexander; Yanovsky, V.; Krushelnick, K.; Beg, F. N.

doi:10.1088/1367-2630/18/11/113032

Cited by 9 publications

(10 citation statements)

References 39 publications

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“…The laser pedestal drops below the detection threshold <10 −9 nearly 50 ps before the main pulse and is 10 −8 nearly 10 ps before the main pulse [35,43]. The laser contrast is undoubtedly crucial for efficient heavy-ion acceleration from ultra-thin targets [44]. In [35], the authors show that the Trident laser contrast was good enough to preserve the integrity of a 250 nm carbon foil (same linear density as a 60 nm titanium foil) and carbon spectral peaks were generated via a similar RIT-enhanced mechanism.…”

Section: Laser System and Ion Diagnosticsmentioning

confidence: 99%

Laser-driven acceleration of quasi-monoenergetic, near-collimated titanium ions via a transparency-enhanced acceleration scheme

Li¹,

Forestier-Colleoni²,

Bailly-Grandvaux³

et al. 2019

New J. Phys.

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Laser-driven ion acceleration has been an active research area in the past two decades with the prospects of designing novel and compact ion accelerators. Many potential applications in science and industry require high-quality, energetic ion beams with low divergence and narrow energy spread. Intense laser ion acceleration research strives to meet these challenges and may provide high charge state beams, with some successes for carbon and lighter ions. Here we demonstrate the generation of well collimated, quasi-monoenergetic titanium ions with energies ∼145 and 180MeV in experiments using the high-contrast (<10 −9 ) and high-intensity (6 10 W cm 20 2 -) Trident laser and ultra-thin (∼100 nm) titanium foil targets. Numerical simulations show that the foils become transparent to the laser pulses, undergoing relativistically induced transparency (RIT), resulting in a two-stage acceleration process which lasts until ∼2 ps after the onset of RIT. Such long acceleration time in the self-generated electric fields in the expanding plasma enables the formation of the quasimonoenergetic peaks. This work contributes to the better understanding of the acceleration of heavier ions in the RIT regime, towards the development of next generation laser-based ion accelerators for various applications.

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Section: Laser System and Ion Diagnosticsmentioning

confidence: 99%

Laser-driven acceleration of quasi-monoenergetic, near-collimated titanium ions via a transparency-enhanced acceleration scheme

Li¹,

Forestier-Colleoni²,

Bailly-Grandvaux³

et al. 2019

New J. Phys.

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“…However, before going to the RPA mechanism, we first examined the potential of this scenario for the ignition of DT plasma. [18,22,[34][35][36] A simple conservative ignition criterion h R h T h > 6 g/(cm 2 keV) can be used to estimate if ignition occurs when the temperature of hot spot, T h , arrives to 10 keV. Our early calculations represent that for proton and Carbon ions of Maxwellian distribution with the recommended distribution temperatures, T beam , of 3 and 30 MeV, peak power time occurs at 12.2 and 13.0 ps, respectively, which is in agreement with the above prerequisite for ion beam effective deposition power.…”

Section: Resultsmentioning

confidence: 99%

“…The number of protons and Carbon ions inside the beam, N 0(:p,C) , was taken from the reported experimental measurements. [18,34,35] We have approximated N 0p = 10 8 protons, with the Maxwellian energy spectrum, beam temperature of T p = 3 MeV. According to experimental evidence for TNSA acceleration, the Carbon beam density is usually a fraction of proton beam and will be expressed by = N 0C /N 0p parameter.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, we have picked up just the values of = 0.1, which is in consistent with the experimental reports on the accelerated ion population densities of proton and Carbon beams in both TNSA and RPA methods. [18,22,[34][35][36] A simple conservative ignition criterion h R h T h > 6 g/(cm 2 keV) can be used to estimate if ignition occurs when the temperature of hot spot, T h , arrives to 10 keV. [37] However, based on our estimations, the temperature curve belongs to hybrid proton-Carbon beam close to h time arrives hardly to 3 keV, much below 10-12 keV threshold for the actual DT plasma ignition temperature.…”

Section: Resultsmentioning

confidence: 99%

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On the evaluation of ignition threshold in proton‐carbon hybrid ignitor beam proposal

Mehrangiz

Khoshbinfar

2019

Contributions to Plasma Physics

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We may improve plasma ignition quality in a conically guided proton fast ignition scheme by the application of an extra lower intensity, secondary carbon beam. According to the experimental measurements on the number of laser-accelerated ions, the temporal evolution of the hot spot electron, ion, and radiation temperatures was examined using three-temperature plasma model, in radiation pressure acceleration (RPA) mechanisms for a proton-Carbon beam configuration, E avg ≈ 10 MeV/nucleon. The hot spot ignition was evaluated by the well-known stopping power models proposed independently by Li-Petrasso (LP) and Brown-Preston-Singleton (BPS). Based on our analytical results, with time, plasma temperature in the LP model surpasses the BPS model. From this point of view, to compensate this deficiency in the BPS method, we will show that the density ratio of 17% is required when the energy spread is 10%. The results were also validated by the DEIRA-4 code. Moreover, the electron-ion equilibrium will decrease up to 9.3 and 4.4% for the LP and BPS methods, respectively. It is demonstrated that the key features of a higher average ion energy as well as the narrow beam profile in the RPA regime may effectively ignite hot spot much better than in the Target Normal Sheath Acceleration (TNSA) counterpart. It is estimated that the proton-Carbon beam proposal can reduce ion beam energy to 8.42 kJ, approximately saving 15% of ignitor energy. K E Y W O R D Sconically guided fast ignition, laser-accelerated ion beam, proton and carbon beam, RPA, TNSA

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“…The acceleration of carbon ions by highly intense laser pulses has been demonstrated by several research groups [28,29,30,31,32], some of them using CR-39 as a detector medium [33,34,35,36,37]. It is anticipated that this technique will be applied in the near future to study the radiobiological effects of carbon ions close to the Bragg peak on cell cultures.…”

Section: Calibration With Carbon Ionsmentioning

confidence: 99%

PADC nuclear track detector for ion spectroscopy in laser-plasma acceleration

et al. 2020

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The transparent polymer polyallyl-diglycol-carbonate (PADC), also known as CR-39, is widely used as detector for heavy charged particles at low fluence.It allows for detection of single protons and ions via formation of microscopic tracks after etching in NaOH or KOH solutions. PADC combines a high sensitivity and high specificity with inertness towards electromagnetic noise. Present fields of application include laser-ion acceleration, inertial confinement fusion, radiobiological studies with cell cultures, and dosimetry of nuclear fragments in particle therapy. These require precise knowledge of the energy-dependent response of PADC to different ion species. We present calibration data for a new type of detector material, Radosys RS39, to protons (0.2-3 MeV) and carbon ions (0.6-12 MeV). RS39 is less sensitive to protons than other types of PADC.Its response to carbon ions, however, is similar to other materials. Our data indicate that RS39 allows for measuring carbon ion energies up to 10 MeV only from the track diameters. In addition, it can be used for discrimination between protons and carbon ions in a single etching process.

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Acceleration of high charge-state target ions in high-intensity laser interactions with sub-micron targets

Cited by 9 publications

References 39 publications

Laser-driven acceleration of quasi-monoenergetic, near-collimated titanium ions via a transparency-enhanced acceleration scheme

Laser-driven acceleration of quasi-monoenergetic, near-collimated titanium ions via a transparency-enhanced acceleration scheme

On the evaluation of ignition threshold in proton‐carbon hybrid ignitor beam proposal

PADC nuclear track detector for ion spectroscopy in laser-plasma acceleration

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