Neutron generation in dense femtosecond laser plasma of a structured solid target

Volkov, R. V.; Golishnikov, D. M.; Gordienko, V. M.; Mikheev, P. M.; Savel’ev, A. B.; Sevast'yanov, V. D.; Chernysh, V. S.; Chutko, O. V.

doi:10.1134/1.1335116

Cited by 21 publications

(8 citation statements)

References 6 publications

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“…Assuming deuterons of tens of keV energy, which have been experimentally observed, the reaction rate < ν >≈ 2.6 × 10 −18 cm 3 /s [14]. Taking plasma life time to be 5 ps [15], about ∼ 4 × 10 3 neutrons per shot is estimated from the above expression. This simple estimate on the neutron 17008-p. 3 …”

Section: Resultsmentioning

confidence: 99%

Observation of neutrons in the interaction of high intensity laser pulses with solid targets

Tayyab

Chakera

Naik

et al. 2013

EPJ Web of Conferences

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Abstract.We report an experimental study on fusion neutron generation from deuterated polyethylene (CD 2 ) n target irradiated by 400 mJ, 45 femtosecond laser pulses focused to an intensity >10 18 W/cm 2 . The fusion neutron signal has been detected using a CR-39 detector, a bubble detector, and also confirmed by a neutron time of flight detector. In addition, substantial bremsstrahlung X-ray radiation of MeV energy was also observed. These MeV X-rays have been used to trigger ( , n) reaction in Be and Cu targets and the resulting photo-neutrons were detected on a BF 3 and a bubble detector.

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Section: Resultsmentioning

confidence: 99%

Observation of neutrons in the interaction of high intensity laser pulses with solid targets

Tayyab

Chakera

Naik

et al. 2013

EPJ Web of Conferences

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“…To measure the fusion yield ranging from over roughly 12 orders of magnitude, from the lowest yields of a few DD neutrons per laser shot up to 10 12 [13,14], various calibrated low/high yield detection systems consisting of e.g., time-of-flight scintillation neutron detectors, nuclear track detectors, bubble and thermoluminescent dosimeters, and activation detectors are used. The total neutron yield into the solid angle of 4π steradian per laser shot is determined assuming that the neutrons are emitted isotropically although there is evidence that the emission from the plasma may not be perfectly isotropic.…”

Section: Y-e Diagramsmentioning

confidence: 99%

“…One of these experiments dealing with deuterium cluster targets irradiated with 100 fs pulses, see Ma04 label, gave the dependence FIGURE 2 | Selected DD-fusion experiments associated with laser energy dependence of fusion neutron yields obeying the power law Q•E 1.65 , where Q SGG = 14 (short dash line), and Q BL = 2,000 (solid line), Q fs = 7.1 × 10 4 (dash-dot line) for explosions of deuterium clusters [2], Q fs = 4.1 × 10 5 (dash line) and Q fs = 7.5 × 10 6 (dot line). Data from References: Ma04 [2], Sy06 [10], Vo00 [13], Pr98 [17], Be06 [18], Iz02 [19], Fr02 [28], Zu13 [33], Di99 [34], V1 [25], V2 [26], V3 [27], PALS [20], Ω14 [22], Iskra5 [21], NIF-DD [23], Ω05 [31], Ω96 [14], SGII-Up [12], GXII [29], GXII95 [32], and SGIII15 [30]. [1,2].…”

Section: Regardless Of Inaccuracies In Total Neutron Yield Determinationmentioning

confidence: 99%

Scaling of Laser Fusion Experiments for DD-Neutron Yield

Krása

Klír

2020

Front. Phys.

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Yields of neutrons produced in various laser fusion experiments conducted in recent decades are compared with each other. It has surprisingly been found that there is a possibility to make an overall elucidation of the variance in the number of neutrons produced in the various experiments. The common method is based on definition of the energy conversion efficiency as a ratio between the energy carried out by neutrons produced through the fusion reaction and the input energy given by laser energy, E, focused on a target. The neutron-yield-laser-energy (Y-E) diagram is the basic chart used to interpret the spread of experimental data in terms of the experimental efficiency of the laser-matter interaction. Experiments carried out using a single laser system show that laser energy dependence of the yield can be well-characterized by a power law, Y = QE α , where Q is the parameter reflecting possible dependence on the pulse duration, laser intensity, laser contrast ratio, focal geometry, target structure, etc. [1, 2]. Sorting the values of the neutron yields obtained in various experiments shows that the power law Y = Q E 1.65 is suitable to determine lines in the Y-E diagram each of them, where the value of Q is associated with quality of experimental conditions [3]. This sorting shows the order-of-magnitude differences in yields found in various experiments, which can be characterized by the value of the parameter Q. Due to the easy feasibility and the large number of DD fusion experiments performed, the overall Y-E diagram gives a chance to identify suitable laser systems for effective DD fusion experiments. It can, therefore, be assumed that some of the conclusions of these experiments could also be applied to the experimental arrangement suitable for optimizing p 11 B fusion.

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“…At the moderate intensities used here, the plasma emission from a single shot is not bright compared to the brightness of the probe beam. However, we can produce a large amount of emission by using multiple laser shots, because the complicated structure of the damage crater increases the laser absorption efficiency [18]. Hence, this can be used to mimic the situation encountered on a high intensity laser shot.…”

Section: Plasma Imagingmentioning

confidence: 99%

Ultrafast gated imaging of laser produced plasmas using the optical Kerr effect

Symes

Wegner

Ahlswede

et al. 2010

Applied Physics Letters

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Optical imaging is a versatile diagnostic for investigations of plasmas generated under intense laser irradiation. Gating techniques are commonly used to reduce the amount of light detected from the self-emission of the hot plasma or to improve the temporal resolution of the detector. The use of an optical Kerr gate enables a superior dynamic range and temporal resolution compared to electronically gated devices. The application of this method for the imaging of laser produced plasmas is demonstrated, and the possibility to produce a sub-10fs, high dynamic range streak camera is discussed. This paper was prepared for submittal to Applied Physics LettersSymes et al. Appl. Phys. Lett.2

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Neutron generation in dense femtosecond laser plasma of a structured solid target

Cited by 21 publications

References 6 publications

Observation of neutrons in the interaction of high intensity laser pulses with solid targets

Observation of neutrons in the interaction of high intensity laser pulses with solid targets

Scaling of Laser Fusion Experiments for DD-Neutron Yield

Ultrafast gated imaging of laser produced plasmas using the optical Kerr effect

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