Charge steering of laser plasma accelerated fast ions in a liquid spray — creation of MeV negative ion and neutral atom beams

Schnürer, M.; Abicht, F.; Prasad, R.; Borghesi, M.; Priebe, G.; Braenzel, J.; Andreev, Alexander A.; Nickles, P. V.; Jequier, S.; Tikhonchuk, V. T.; Ter‐Avetisyan, S.

doi:10.1063/1.4829005

Cited by 9 publications

(9 citation statements)

References 33 publications

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“…In contrast, in the approach we reported in Ref. 2, complexities related to the acceleration processes itself (e.g., temporal, spatial, and characteristics of electrons and ions within the laser plasma source) do not need to be considered and the condition of the target atoms can be controlled precisely. The electron capture and loss mechanisms can thus be studied separately and any influence of excited atoms can be determined.…”

mentioning

confidence: 83%

“…The conditions of equilibrium-charge-state distributions in Ref. 2, which were established in the beam during its propagation through the spray, are not sufficient to infer the absolute crosssections for the processes, although certain ratios and trends for the cross-sections may be deduced. For example, a strong enhancement of low charge state densities may indicate a contribution of multiple electron capture or loss processes.…”

mentioning

confidence: 99%

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New source of MeV negative ion and neutral atom beams

Ter‐Avetisyan

Braenzel

Schnürer

et al. 2015

Review of Scientific Instruments

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The scenario of “electron-capture and -loss” was recently proposed for the formation of negative ion and neutral atom beams with MeV kinetic energies. However, it does not explain why the formation of negative ions in a liquid spray is much more efficient than with an isolated atom. The role of atomic excited states in the charge-exchange processes is considered, and it is shown that it cannot account for the observed phenomena. The processes are more complex than the single electron-capture and -loss approach. It is suggested that the shell effects in the electronic structure of the projectile ion and/or target atoms may influence the capture/loss probabilities.

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mentioning

confidence: 83%

mentioning

confidence: 99%

New source of MeV negative ion and neutral atom beams

Ter‐Avetisyan

Braenzel

Schnürer

et al. 2015

Review of Scientific Instruments

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“…Negative hydrogen ions (H − ions) play an important role in many terrestrial 1 – 7 as well as extra-terrestrial 8 – 10 natural physical phenomena. The negative ions are often used in many other industrial applications, such as in ion beam deposition studies, for micrometer-sized powder surface modification, damage-free nano-particle formation for quantum devices, bio-compatibility surface treatment in nerve cell engineering 1 fields, tandem accelerators 11 and high energetic Neutral Beam Injection (NBI) system for fusion reactor 2 – 7 .…”

Section: Introductionmentioning

confidence: 99%

Development of a novel surface assisted volume negative hydrogen ion source

Kakati

Kausik

Bandyopadhyay

et al. 2017

Sci Rep

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H− ion based neutral beam injector is a critical heating and current drive system in a fusion reactor. However, the present H− ion source configuration has limitations in terms of production, extraction, cesium (Cs) inventory and management. To overcome these limitations, a proof-of-principle experiment based on a novel concept regarding surface assisted volume H− ions production by sprinkling Cs coated tungsten (W) dust grains (low work function surface) into a hydrogen plasma is carried out. Four different diagnostics have been used to validate the concept. The H− ion fraction is estimated from (a) Langmuir probe diagnostic, (b) phase velocity of ion acoustic waves, (c) dust current and confirmed by the measurement of (d) Balmer line ratio. The measured H− ion fraction with respect to the plasma density for different discharge conditions varies from ~0.2 to 0.3 in presence of Cs coated W dust particles. The experimental results show good agreement with the theoretical estimation.

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“…Laser-driven ion acceleration by intense, ultra-short laser pulse has seen numerous innovations in recent years, new acceleration schemes have been proposed [1][2][3][4][5], the development of large dedicated facilities around the world [6], and new proton energy records [7] have been obtained, which put laser accelerated beams even closer to their applications. Less attention has been dedicated to neutral particles production with lasers, with nevertheless a recent regain in interest [1,8,9]. Unaffected by electro-magnetic fields, neutral particles can penetrate deeper than ions into targets, and a compact laser-driven energetic neutral source could be of high-interest for research and industry, complementary to charged particles [10].…”

Section: Introductionmentioning

confidence: 99%

Efficient laser production of energetic neutral beams

Mollica¹,

Antonelli²,

Flacco³

et al. 2016

Plasma Phys. Control. Fusion

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Laser-driven ion acceleration by intense, ultra-short, laser pulse has received increasing attention in recent years, and the availability of much compact and versatile ions sources motivates the study of laser-driven sources of energetic neutral atoms. We demonstrate the production of a neutral and directional beam of hydrogen and carbon atoms up to 200 keV per nucleon, with a peak flow of × 2.7 10 13 atom s −1 . Laser accelerated ions are neutralized in a pulsed, supersonic argon jet with tunable density between × 1.5 10 17 cm −3 and × 6 10 18 cm −3 . The neutralization efficiency has been measured by a time-of-flight detector for different argon densities. An optimum is found, for which complete neutralization occurs. The neutralization rate can be explained only at high areal densities (> × 1 10 17 cm −2 ) by single electron charge transfer processes. These results suggest a new perspective for the study of neutral production by laser and open discussion of neutralization at a lower density.

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Charge steering of laser plasma accelerated fast ions in a liquid spray — creation of MeV negative ion and neutral atom beams

Abstract: Ter-Avetisyan, S. (2013). Charge steering of laser plasma accelerated fast ions in a liquid spray -Creation of MeV negative ion and neutral atom beams.

Cited by 9 publications

References 33 publications

New source of MeV negative ion and neutral atom beams

New source of MeV negative ion and neutral atom beams

Development of a novel surface assisted volume negative hydrogen ion source

Efficient laser production of energetic neutral beams

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