Efficient Fast Neutron Generation in a Femtosecond, Deuterated,Polystyrene Plasma

Lee, Sungman; Park, Sang‐Soon; Yea, Kwon-hae; Kwon, Duck-Hee; Park, Seung-Kyu; Jeong, Young Uk; Cha, Hyunju

doi:10.3938/jkps.55.543

Cited by 7 publications

(2 citation statements)

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“…It is natural to investigate deuterium Z-pinches as compact sources of fast neutrons since they offer a high conversion efficiency of stored electrical energy into fast ions [10,11]. [12] and JT-60U [13] tokamaks; FMPF-3 [14], NX-3 [15] and Limeil [16] plasma foci; Omega [17], Kaeri [18] and Mercury [19] lasers; gas puff Z-pinch on S-300 [11] and Z [6].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of neutron emission from mega-ampere deuterium gas puff Z-pinch at microsecond implosion times

Klír¹,

Shishlov²,

Kokshenev³

et al. 2013

Plasma Phys. Control. Fusion

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Experiments with deuterium (D 2 ) triple shell gas puffs were carried out on the GIT-12 generator at a 3 MA current level and microsecond implosion times. The outer, middle and inner nozzle diameters were 160 mm, 80 mm and 30 mm, respectively. The influence of the mass of deuterium shells on neutron emission times, neutron yields and neutron energy spectra was studied. The injected linear mass of deuterium varied between 50 and 255 µg cm −1 . Gas puffs imploded onto the axis before the peak of generator current at 700-1100 ns. Most of the neutrons were emitted during the second neutron pulse after the development of instabilities. Despite higher currents, heavier gas puffs produced lower neutron yields. Optimal mass and a short time delay between the valve opening and the generator triggering were more important than the better coincidence of stagnation with peak current. The peak neutron yield from D(d, n) 3 He reactions reached 3 × 10 11 at 2.8 MA current, 90 µg cm −1 injected linear mass and 37 mm anode-cathode gap. In the case of lower mass shots, a large number of 10 MeV neutrons were produced either by secondary DT reactions or by DD reactions of deuterons with energies above 7 MeV. The average neutron yield ratio Y >10 MeV /Y 2.5 MeV reached (6 ± 3) × 10 −4 . Such a result can be explained by a power law distribution for deuterons as dN d /dE d ∝ E −3 d . The optimization of a D 2 gas puff Z-pinch and similarities to a plasma focus and its drive parameter are described.

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Section: Introductionmentioning

confidence: 99%

“…Figure 1. Efficiency of DD neutron production for various plasma-based sources: JET[12] and JT-60U[13] tokamaks; FMPF-3[14], NX-3[15] and Limeil[16] plasma foci; Omega[17], Kaeri[18] and Mercury[19] lasers; gas puff Z-pinch on S-300[11] and Z[6].…”

mentioning

confidence: 99%

Characterization of neutron emission from mega-ampere deuterium gas puff Z-pinch at microsecond implosion times

Klír¹,

Shishlov²,

Kokshenev³

et al. 2013

Plasma Phys. Control. Fusion

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Observation of repetitive bursts in emission of fast ions and neutrons in sub-nanosecond laser-solid experiments

et al. 2013

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A massive deuterated polyethylene target was exposed to laser intensities of about 3 × 10 16 W/cm 2 employing the 3-TW Prague Asterix Laser System (PALS). We achieved a yield of 2 × 10 8 neutrons per laser shot. Average time-of-flight signals of scintillation detectors operated in current mode reveal broad energy spectra of fusion neutrons with dominating energy of about 2.45 MeV. The energy dependence of the neutron yield shows a consistency in results of nanosecond, picosecond and sub-picosecond experiments. Here we also show that ions emitted in the backward direction from the front target surface have a multi-peak energy spectrum, which is caused by burst emission mechanisms.

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A laser-induced repetitive fast neutron source applied for gold activation analysis

Lee

Park

Lee

et al. 2012

Review of Scientific Instruments

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A laser-induced repetitively operated fast neutron source was developed for applications in laser-driven nuclear physics research. The developed neutron source, which has a neutron yield of approximately 4 × 10(5) n/pulse and can be operated up to a pulse repetition rate of 10 Hz, was applied for a gold activation analysis. Relatively strong delayed gamma spectra of the activated gold were measured at 333 keV and 355 keV, and proved the possibility of the neutron source for activation analyses. In addition, the nuclear reactions responsible for the measured gamma spectra of gold were elucidated by the 14 MeV fast neutrons resulting from the D(t,n)He(4) nuclear reaction, for which the required tritium originated from the primary fusion reaction, D(d,p)T(3).

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Efficient Fast Neutron Generation in a Femtosecond, Deuterated,Polystyrene Plasma

Cited by 7 publications

References 0 publications

Characterization of neutron emission from mega-ampere deuterium gas puff Z-pinch at microsecond implosion times

Characterization of neutron emission from mega-ampere deuterium gas puff Z-pinch at microsecond implosion times

Observation of repetitive bursts in emission of fast ions and neutrons in sub-nanosecond laser-solid experiments

A laser-induced repetitive fast neutron source applied for gold activation analysis

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