Neutron production in a picosecond laser plasma at a radiation intensity of 3×1017W/cm2

Belyaev, V. S.; Виноградов, В. И.; Kurilov, A. S.; Матафонов, А. П.; Андрианов, В. П.; Ignat’ev, G. N.; Faenov, A. Ya.; Pikuz, T. A.; Skobelev, I. Yu.; Magunov, A. I.; Pikuz, S. A.; Sharkov, B.

doi:10.1134/1.1777625

Cited by 21 publications

(27 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the datasets in Figure 1 is from experiments reported in 2004-2006 by Belyaev and collaborators in Russia [20]. Tey reported measuring a considerable neutron yield of 5 × 10 4 per pulse from the irradiation of the surface of a solid deuterated target by a picosecond laser plasma at an intensity of 3 × 10 17 W/cm 2 .…”

Section: Alpha Yields From Laser-driven Experiments With Boron Targetsmentioning

confidence: 99%

Path to Increasing p-B11 Reactivity via ps and ns Lasers

et al. 2022

View full text Add to dashboard Cite

The Lawson criterion for proton-boron (p-11B) thermonuclear fusion is substantially higher than that for deuterium-tritium (DT) because the fusion cross section is lower and peaks at higher ion energies. The Maxwellian averaged p-11B reactivity peaks at several hundred keV, where bremsstrahlung radiation emission may dominate over fusion reactions if electrons and ions are in thermal equilibrium and the losses are unrestricted. Nonequilibrium burn has often been suggested to realize the benefits of this aneutronic reaction, but the predominance of elastic scattering over fusion reactivity makes this difficult to achieve. The development of ultrashort pulse lasers (USPL) has opened new possibilities for initiating nonequilibrium thermonuclear burns and significant numbers of p-11B alpha particles have been reported from several experiments. We present an analysis that shows that these significant alpha yields are the result of beam fusion reactions that do not scale to net energy gain. We further find that the yields can be explained by experimental parameters and recently updated cross sections such that a postulated avalanche mechanism is not required. We use this analysis to understand the underlying physics of USPL-driven nonequilibrium fusion reactions and whether they can be used to initiate fusion burns. We conclude by outlining a path to increasing the p-11B reactivity towards the goal of achieving ignition and describing the design principles that we will use to develop a computational point design.

show abstract

Section: Alpha Yields From Laser-driven Experiments With Boron Targetsmentioning

confidence: 99%

Path to Increasing p-B11 Reactivity via ps and ns Lasers

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The measurements [24] N98 and B06 were with same ps laser pulses of same power, however the measurement of Norreyes et al, N98, was with extremely high contrast ratio for producing block generation with the 10,000 times higher fusion gains in contrast to B06 with usual pulses working at thermal equilibrium conditions. In the first case, the 10,000 times increased neutron gains were measured at exceptionally low temperature in contrast to B06 [28]. The measured low temperature of N98 [24] (Fig.…”

Section: Experiments With Dominating Non-thermal Plasma Block Accelermentioning

confidence: 82%

First Option for Fusion with CPA-Laser Pulses instead of Thermal Pressures with Dozens of Million Degrees Temperature for Laser-Boron-Fusion

Hora¹,

Kirchhoff²,

McKenzie³

et al. 2019

JEPE

View full text Add to dashboard Cite

To avoid the > 50 million degree temperatures in pressures for fusion, the goal has now been reached that higher pressures from picosecond CPA-laser pulses of more than 10 PW power can ignite nuclear fusion at modest temperatures in a power reactor for generating electricity. Gerard Mourou, who was honoured with the 2018 Physics Nobel Prize, was involved to solve this crucial problem of fusion energy with the reactor design as co-authors (Hora, H.

show abstract

“…In Fig. The small pore (CD 2 ) n foam layers with densities 10, 20, 30 and 40 mg/cc (see Fig 2b and 2c) were used to investigate the influence of density and structure on the neutron yield in strong e.m. fields [4]. The lower row of craters is obtained at intensities of 10 18 W/cm 2 and the upper row -at 5·10 15 W/cm 2 .…”

Section: Targetsmentioning

confidence: 99%