Research on pinch plasma focus devices of hundred of kilojoules to tens of joules

Soto, Leopoldo; Silva, Patricio; Moreno, José; Silvester, Gustavo; Zambra, Marcelo; Pavez, Cristian; Altamirano, Luis; Bruzzone, H.; Barbaglia, Mario Oscar; Sidelnikov, Yurii; Kies, W.

doi:10.1590/s0103-97332004000800054

Cited by 56 publications

(26 citation statements)

References 14 publications

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“…Only the SPEED machines, most notably SPEED II [51,54] operated at low hundreds of kV. No extensive data have been published from the SPEED machines.…”

Section: Beyond Presently Observed Neutron Saturation Regimesmentioning

confidence: 99%

Numerical Experiments Providing New Insights into Plasma Focus Fusion Devices

Lee

Saw

2010

Energies

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Recent extensive and systematic numerical experiments have uncovered new insights into plasma focus fusion devices including the following: (1) a plasma current limitation effect, as device static inductance is reduced towards very small values; (2) scaling laws of neutron yield and soft x-ray yield as functions of storage energies and currents; (3) a global scaling law for neutron yield as a function of storage energy combining experimental and numerical data showing that scaling deterioration has probably been interpreted as neutron 'saturation'; and (4) a fundamental cause of neutron 'saturation'. The ground-breaking insights thus gained may completely change the directions of plasma focus fusion research.

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“…Only the SPEED machines, most notably SPEED II [51,54] operated at low hundreds of kV. No extensive data have been published from the SPEED machines.…”

Section: Beyond Presently Observed Neutron Saturation Regimesmentioning

confidence: 99%

Numerical Experiments Providing New Insights into Plasma Focus Fusion Devices

Lee

Saw

2010

Energies

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“…Using the Dena's anode radius and the following working conditions: 16 kV, 288 µF, and ξ = 0.75, the energy density in the thermal phase is about 3.51 × 10 10 (J/m 3 ). Also, it is demonstrated by Soto et al [9] that the plasma energy density at the pinch moment for the Mather-type PF is proportional to E/V P ≈ 28ξU 0 /a 3 M (J/m 3 ). In general, the energy density at the pinch in various Mather-type PF devices has values on the order of (1 − 10) × 10 10 (J/m 3 ) [11].…”

Section: Pinched Energy Densitymentioning

confidence: 94%

“…6). Using (9) and because the plasma compression phase has a cylindrical symmetry, (11) can be expressed as an Abel integral equation [19]:…”

Section: B Methods Of Fringe Shift Density Measurementmentioning

confidence: 99%

“…According to the experimental results carried out with the optical diagnostics [7] and scaling law [8] in the optimum neutron production conditions, the final pinched plasma radius and the maximum length (previous to appearance of instability) are on the order of 0.12a M and 0.8a M , respectively, where a M is the anode radius in the Mather-type PF device [8], [9]. In general, the radius of the pinch can be related to the anode radius of the PF devices.…”

Section: Pinched Energy Densitymentioning

confidence: 99%

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Pinched Plasma Study in a Filippov-Type Plasma Focus “Dena”

Talaei

Kiai

Adlparvar

2008

IEEE Trans. Plasma Sci.

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A characteristic feature of physical processes occurring in pinched plasma is their tendency to generate thermal and nonthermal emissions. In this case, the roles played by plasma compression dynamics such as pinch formation, pinch disruption, expansion, etc., are predominant. In this paper, first, we present some of the experimental results concerning the thermal and nonthermal neutron emissions. Then, a new approach based on some theoretical assumptions and the experimental data for which the pinched plasma density evolution was studied are introduced. In the new approach, the compression dynamics are divided into two phases: plasma compression (thermal) and plasma expansion (nonthermal). For each phase, electron distribution functions such as a parabolic and a hyperbolic are attributed, respectively. Assuming a maximum electron density for each phase and an Abel integral equation (used in laser interferometry method), the fringe density maps in a new Filippov-type plasma focus "Dena" (25 kV, 288 µF, and 90 kJ) operating in deuterium gas were obtained in the approximation of low collision frequencies.Index Terms-Filippov-type plasma focus, fringe shift density, laser interferometry, neutron production mechanisms, pinched plasma.

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“…In a miniature plasma focus, a single-frame image converter camera (4-ns exposure) was used to obtain plasma images in the visible range [4], [5]. The photographs showed formation of the plasma sheath on the insulator surface, radial compression of the current sheath, and the plasma detachment from the anode in the axial direction.…”

Section: Introductionmentioning

confidence: 99%

Correlation Analysis of Intense and High-Energy Deuteron Beam, Pinch Images, and Neutron Yield

Roshan

Lee

Pan

et al. 2010

IEEE Trans. Plasma Sci.

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The time-integrated imaging of pinched plasma column in the NX2 plasma focus device is performed using a generalpurpose digital SLR camera with neutral density filters (ND 0.9). Although it is very simple, some useful information is obtained from the pinch phase of plasma focus device, and the images are compared with the neutron yield, electron, and ion beams produced in the compressed plasma column. The correlation between the pinch images, the range of deuteron energies, and the optimum neutron condition shows two regimes of plasma focus performance: high-pressure regime for maximum neutron yield production and low-pressure regime for high-energy ion (and electron) beam production.Index Terms-High-energy deuteron beams, neutron yield, pinch imaging.

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Research on pinch plasma focus devices of hundred of kilojoules to tens of joules

Cited by 56 publications

References 14 publications

Numerical Experiments Providing New Insights into Plasma Focus Fusion Devices

Numerical Experiments Providing New Insights into Plasma Focus Fusion Devices

Pinched Plasma Study in a Filippov-Type Plasma Focus “Dena”

Correlation Analysis of Intense and High-Energy Deuteron Beam, Pinch Images, and Neutron Yield

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