Hyper-Velocity Fullerene-Dusty Plasma Jets for Disruption Mitigation

Bogatu, I. N.; Галкин, С. А.; Kim, J. S.

doi:10.1007/s10894-007-9096-z

Cited by 8 publications

(9 citation statements)

References 13 publications

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“…7 is for a slow injection speed, but we have observed similar behavior for faster injections (not shown here). However, even by using argon with n j = 53.8 (1 × 10 17 cm −3 ), the total mass would be only ∼ 3.5 mg mass per jet, which is about ∼ 700 times smaller than the needed mass (∼ 2.5 g) for disruption mitigation [13]. Thus, the near term use of unmagnetized dense jets for refueling and ELM pacing appear to be more promising than for disruption mitigation.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…Thus, the near term use of unmagnetized dense jets for refueling and ELM pacing appear to be more promising than for disruption mitigation. One interesting proposal [13] is the use of heavy C 60 -fullerene (buckyball) molecules by which dense jet injection could potentially become a solution for disruption mitigation.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…In addition, very recent developments in coaxial gun and mini-railgun technology utilizing a preionized fill plasma [10] (of any gas species) make it timely to use modern simulation tools to gain insight into the penetration and injection dynamics of unmagnetized dense plasma jets into an ITER or NSTX-like (National Spherical Torus Experiment) [11] plasma. Unmagnetized dense plasma jet injection may also potentially find applications for edge localized mode (ELM) pacing [12] and disruption mitigation [13].…”

Section: Introductionmentioning

confidence: 99%

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A systematical study of neutron-rich Zr isotopes by the projected shell model

et al. 2011

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Abstract. We present results from three-dimensional ideal magnetohydrodynamic simulations of unmagnetized dense plasma jet injection into a uniform hot strongly magnetized plasma, with the aim of providing insight into core fueling of a tokamak with parameters relevant for ITER and NSTX (National Spherical Torus Experiment). Unmagnetized dense plasma jet injection is similar to compact toroid injection but with much higher plasma density and total mass, and consequently lower required injection velocity. Mass deposition of the jet into the background appears to be facilitated via magnetic reconnection along the jet's trailing edge. The penetration depth of the plasma jet into the background plasma is mostly dependent on the jet's initial kinetic energy, and a key requirement for spatially localized mass deposition is for the jet's slowing-down time to be less than the time for the perturbed background magnetic flux to relax due to magnetic reconnection. This work suggests that more accurate treatment of reconnection is needed to fully model this problem. Parameters for unmagnetized dense plasma jet injection are identified for localized core deposition as well as edge localized mode (ELM) pacing applications in ITER and NSTX-relevant regimes.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A systematical study of neutron-rich Zr isotopes by the projected shell model

et al. 2011

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“…Some examples for coaxial plasma accelerators are plasma thruster, dense plasma focus (DPF), plasma refueling and high current switches. 3,[9][10][11][12] While there is also a long history of experiments with colliding plasmas there are still new approaches to study colliding plasmas. Some examples for colliding plasmas based on pulsed power driven accelerators (e.g.…”

Section: Introductionmentioning

confidence: 99%

Electron density and plasma dynamics of a colliding plasma experiment

et al. 2016

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We present experimental results of two head-on colliding plasma sheaths accelerated by pulsed-power-driven coaxial plasma accelerators. The measurements have been performed in a small vacuum chamber with a neutral-gas prefill of ArH2 at gas pressures between 17 Pa and 400 Pa and load voltages between 4 kV and 9 kV. As the plasma sheaths collide, the electron density is significantly increased. The electron density reaches maximum values of ≈8 ⋅ 1015 cm−3 for a single accelerated plasma and a maximum value of ≈2.6 ⋅ 1016 cm−3 for the plasma collision. Overall a raise of the plasma density by a factor of 1.3 to 3.8 has been achieved. A scaling behavior has been derived from the values of the electron density which shows a disproportionately high increase of the electron density of the collisional case for higher applied voltages in comparison to a single accelerated plasma. Sequences of the plasma collision have been taken, using a fast framing camera to study the plasma dynamics. These sequences indicate a maximum collision velocity of 34 km/s.

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Section: Introductionmentioning

confidence: 99%

Ideal magnetohydrodynamic simulations of unmagnetized dense plasma jet injection into a hot strongly magnetized plasma

Liu

Hsu

2011

Nucl. Fusion

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We present results from three-dimensional ideal magnetohydrodynamic simulations of unmagnetized dense plasma jet injection into a uniform hot strongly magnetized plasma, with the aim of providing insight into core fueling of a tokamak with parameters relevant for ITER and NSTX (National Spherical Torus Experiment). Unmagnetized dense plasma jet injection is similar to compact toroid injection but with much higher plasma density and total mass, and consequently lower required injection velocity. Mass deposition of the jet into the background appears to be facilitated via magnetic reconnection along the jet's trailing edge. The penetration depth of the plasma jet into the background plasma is mostly dependent on the jet's initial kinetic energy, and a key requirement for spatially localized mass deposition is for the jet's slowing-down time to be less than the time for the perturbed background magnetic flux to relax due to magnetic reconnection. This work suggests that more accurate treatment of reconnection is needed to fully model this problem. Parameters for unmagnetized dense plasma jet injection are identified for localized core deposition as well as edge localized mode (ELM) pacing applications in ITER and NSTX-relevant regimes.

show abstract

Hyper-Velocity Fullerene-Dusty Plasma Jets for Disruption Mitigation

Cited by 8 publications

References 13 publications

A systematical study of neutron-rich Zr isotopes by the projected shell model

A systematical study of neutron-rich Zr isotopes by the projected shell model

Electron density and plasma dynamics of a colliding plasma experiment

Ideal magnetohydrodynamic simulations of unmagnetized dense plasma jet injection into a hot strongly magnetized plasma

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