Selective deuteron production using target normal sheath acceleration

Morrison, John T.; Storm, Malte; Chowdhury, Enam; Akli, K. U.; Feldman, S.; Willis, C.; Daskalova, Rebecca; Growden, Tyler A.; Berger, Paul R.; Ditmire, T.; Woerkom, L. Van; Freeman, R. R.

doi:10.1063/1.3695061

Cited by 24 publications

(19 citation statements)

References 23 publications

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“…This interest is from a fundamental perspective in ultraintense laser-plasma interaction (ULPI), the time-resolved probing of ULPI [2], and the isochoric heating of targets [3,4] into a state of warm dense matter. Laser-driven ion acceleration is also interesting for the prospect of developing novel, compact and cost-effective ion sources for a variety of uses: cancer radiotherapy [5][6][7], short-lived medical isotope production for positron emission tomography [8,9], secondary neutron generation [10][11][12][13][14], surface engineering [15], material processing [15], and others [16]. Each of these potential applications of ultra-intense laser-plasma technology will require ion acceleration to occur at simultaneously relevant energies, fluence, and repetition rate.…”

Section: Introductionmentioning

confidence: 99%

“…This sheath field is typically strong enough to significantly affect the energies of subsequent MeV electrons escaping the target region [21]. The sheath field accelerates protons and carbon ions from the contaminant layer on the surface of the target in the direction perpendicular to the target plane [12,22]. Other mechanisms for accelerating ions exist [23], such as relativistic light sail [24], radiation pressure acceleration [25] and break out afterburner [26,27].…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…al. 17 and Maksimchuk et. al , 18 denoted D-Li (Ice), 800 nm Al targets were cryogenically cooled to allow D 2 O water vapor to freeze to the target front and rear surface, forming a deuteron rich contaminant "ice" layer which was nearly proton free and dramatically enhanced the number of accelerated deuterons.…”

Section: Methodsmentioning

confidence: 92%

Ultra-intense laser neutron generation through efficient deuteron acceleration

et al. 2013

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Experiments at the HERCULES laser facility, originally reported by C. Zulick, et al in Applied Physics Letters (2013), have produced neutron beams with energies up to 16.8(±0.3) MeV using 7 3 Li(d,n) 8 4 Be reactions. These efficient deuteron reactions required the selective acceleration of deuterons through the introduction of a deuterated plastic or cryogenically frozen D 2 O layer on the surface of a thin film target. It was shown that a optimized frozen D 2 O layer, formed in situ, yielded the highest efficiency deuteron acceleration with deuterons constituting over 99% of the accelerated light ions. The deuteron signal was optimized with respect to the delay between the heavy water deposition and laser pulse arrival, as well as the temperature of the target. A total conversion efficiency of laser energy to neutron energy of 1(±0.5) × 10 −5 was obtained. The simulated neutron signal was found to be in reasonable agreement with the experimental spectra. The scattering of neutrons through shielding and target materials was investigated with MCNPX and determined to have a small effect on the observed neutron energies.

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“…15,16 A number of alignment techniques are available for precise target alignment, depending on the nature of the target. For example, optically smooth targets can be aligned using a specularly reflected beam, 17 where the centroid location of an image of the reflected beam changes with target position along the laser axis, or in the z direction. This technique loses precision for optically rough targets as a poor reflected a) willis.276@osu.edu mode from a rough target complicates the centroid calculation.…”

Section: Introductionmentioning

confidence: 99%

A confocal microscope position sensor for micron-scale target alignment in ultra-intense laser-matter experiments

Willis

Poole

Akli

et al. 2015

Review of Scientific Instruments

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A diagnostic tool for precise alignment of targets in laser-matter interactions based on confocal microscopy is presented. This device permits precision alignment of targets within the Rayleigh range of tight focusing geometries for a wide variety of target surface morphologies. This confocal high-intensity positioner achieves micron-scale target alignment by selectively accepting light reflected from a narrow range of target focal planes. Additionally, the design of the device is such that its footprint and sensitivity can be tuned for the desired chamber and experiment. The device has been demonstrated to position targets repeatably within the Rayleigh range of the Scarlet laser system at The Ohio State University, where use of the device has provided a marked increase in ion yield and maximum energy.

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Selective deuteron production using target normal sheath acceleration

Cited by 24 publications

References 23 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

Ultra-intense laser neutron generation through efficient deuteron acceleration

A confocal microscope position sensor for micron-scale target alignment in ultra-intense laser-matter experiments

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