Effect of krypton admixture in deuterium on neutron yield in a megaampere dense plasma focus

Hahn, Eric N.; Housley, David; Narkis, J.; Conti, F.; Lowe, Daniel; Beg, F. N.

doi:10.1063/5.0020936

Cited by 10 publications

(4 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where the loss of energy by collisions is neglected. This would also explain the observation of higher FWHM of neutron spectrum in the radial direction as compared to axial direction in the Limeil device, the evidence of azimuthal motion of reacting deuterons in Frascati and POSEIDON and anisotropy less than unity in the first neutron pulse of POSEIDON discussed in Section 2.4.2 and in the Gemini plasma focus [436] discussed in Section 5.3 (8)d.…”

mentioning

confidence: 83%

“…The increase in neutron yield by doping of deuterium with high z gases is observed in Filippov devices PF-3 (see Section 3.1.6), Sahand [437], a 1 MJ Mather device Gemini [436], and in smaller Mather type devices in Singapore [221,432] and University of Malaya [413,434]. It is not observed in DPF78 [431].…”

Section: Why Does the Neutron Yield Scaling Fail At High Bank Energies?mentioning

confidence: 97%

“…This "Emerging Narrative" consistently explains results from many laboratories collected over several decades of research and listed in Sections 2.4 and 4. Of particular interest is the recent (2020) observation of neutron yield anisotropy (end/side) less than 1 (see Section 5.3 (8)d) on the Gemini device [436], the only MA-level Mather type current operating device other than PF-1000. This is the opposite of what is expected from an axial beam-target mechanism, but is understandable in terms of the ICDMP BEAM-TARGET model.…”

Section: Contours Of the "Emerging Narrative"mentioning

confidence: 99%

“…Gemini device at Las Vegas, USA An investigation regarding the effect of krypton admixture in deuterium on neutron yield in the Gemini plasma focus (see Section 3.1.4) reports [436] the following observations: a.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Update on the Scientific Status of the Plasma Focus

Auluck

Kubeš

Paduch

et al. 2021

Plasma

View full text Add to dashboard Cite

This paper is a sequel to the 1998 review paper “Scientific status of the Dense Plasma Focus” with 16 authors belonging to 16 nations, whose initiative led to the establishment of the International Center for Dense Magnetized Plasmas (ICDMP) in the year 2000. Its focus is on understanding the principal defining characteristic features of the plasma focus in the light of the developments that have taken place in the last 20 years, in terms of new facilities, diagnostics, models, and insights. Although it is too soon to proclaim with certainty what the plasma focus phenomenon is, the results available to date conclusively indicate what it is demonstrably not. The review looks at the experimental data, cross-correlated across multiple diagnostics and multiple devices, to delineate the contours of an emerging narrative that is fascinatingly different from the standard narrative, which has guided the consensus in the plasma focus community for several decades, without invalidating it. It raises a question mark over the Fundamental Premise of Controlled Fusion Research, namely, that any fusion reaction having the character of a beam-target process must necessarily be more inefficient than a thermonuclear process with a confined thermal plasma at a suitably high temperature. Open questions that need attention of researchers are highlighted. A future course of action is suggested that individual plasma focus laboratories could adopt in order to positively influence the future growth of research in this field, to the general benefit of not only the controlled fusion research community but also the world at large.

show abstract

mentioning

confidence: 83%

Section: Why Does the Neutron Yield Scaling Fail At High Bank Energies?mentioning

confidence: 97%

Section: Contours Of the "Emerging Narrative"mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Update on the Scientific Status of the Plasma Focus

Auluck

Kubeš

Paduch

et al. 2021

Plasma

View full text Add to dashboard Cite

show abstract

Observation of poloidal magnetic flux emission from the post-pinch phase of a plasma focus and its significance for laboratory simulation of astrophysical jets

Auluck¹,

Blagoev²

2023

Fundamental Plasma Physics

View full text Add to dashboard Cite

Magnetohydrodynamic simulations of a megaampere-class Kr-doped deuterium dense plasma focus

Narkis

Hahn

Lowe³

et al. 2021

Physics of Plasmas

View full text Add to dashboard Cite

The addition of Kr dopant to a deuterium or deuterium–tritium dense plasma focus (DPF) is conventionally thought to enhance radiative cooling of the imploding sheath, resulting in a tighter pinch and, under optimized conditions, increased neutron yield [M. Krishnan, IEEE Trans. Plasma Sci. 40, 3189 (2012)]. In this work, 2D radiation magnetohydrodynamic (MHD) simulations are conducted of a DPF at peak current levels in the 2–3 MA range with Kr dopant concentrations of 0%, 0.1%, and 1.0% (by volume). Fully kinetic simulations are required to accurately model the pinch stagnation and accurately predict total neutron yield (thermonuclear + beam target), as MHD simulations cannot capture kinetic effects or beam-target neutron production. However, insights can be gained from following the evolution of the bulk dynamics of the sheath. The results show that sheath width narrows with increasing dopant concentration due to increased radiation. Thermonuclear neutron yields of ∼109−1010 are observed, which is in good agreement with experimental data [E. N. Hahn et al., J. Appl. Phys. 128, 143302 (2020)] and simulations [N. Bennett et al., Phys. Plasmas 24, 021702 (2017)] that measure yields of ∼1011 at ∼2 MA with ∼1% of that yield having thermonuclear origin. Scaling in excess of the conventional ∝I4 scaling is observed, though this should be confirmed with 3D and/or fully kinetic simulations of Kr-doped DPFs.

show abstract

Effect of krypton admixture in deuterium on neutron yield in a megaampere dense plasma focus

Cited by 10 publications

References 28 publications

Update on the Scientific Status of the Plasma Focus

Update on the Scientific Status of the Plasma Focus

Observation of poloidal magnetic flux emission from the post-pinch phase of a plasma focus and its significance for laboratory simulation of astrophysical jets

Magnetohydrodynamic simulations of a megaampere-class Kr-doped deuterium dense plasma focus

Contact Info

Product

Resources

About