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

Liu, Wei; Hsu, S. C.

doi:10.1088/0029-5515/51/7/073026

Cited by 8 publications

(7 citation statements)

References 21 publications

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“…In addition, nonlinear ideal magnetohydrodynamic (MHD) simulations have modeled a plasma injected into a transverse magnetic field under varying conditions. [26][27][28] We report here the experimental observation of emergent kink stabilization of a current-driven plasma jet injected into a transverse background magnetic field. Experiments have also been carried out in which a plasma-jet is injected into a background plasma (temperature T e ∼ 1-5 eV, density ∼ 10 17 m −3 ), [29,30] but in such low-β (∼ 0.01) plasmas, the magnetic field provides the dominant mechanism for kink stabilization.…”

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confidence: 95%

Emergent kink stability of a magnetized plasma jet injected into a transverse background magnetic field

et al. 2017

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We report experimental results on the injection of a magnetized plasma jet into a transverse background magnetic field in the HelCat linear plasma device at the University of New Mexico [M. Gilmore et al., J. Plasma Phys. 81, 345810104 (2015)]. After the plasma jet leaves the plasma-gun muzzle, a tension force arising from an increasing curvature of the background magnetic field induces in the jet a sheared axial-flow gradient above the theoretical kink-stabilization threshold. We observe that this emergent sheared axial flow stabilizes the n = 1 kink mode in the jet, whereas a kink instability is observed in the jet when there is no background magnetic field present.

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confidence: 95%

Emergent kink stability of a magnetized plasma jet injected into a transverse background magnetic field

et al. 2017

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“…A number of matter injection technologies have been studied, including conventional gas puffing, supersonic gas injection and pellet injection for various velocity ranges. Classical (gas gun type or centrifuge driven) pellet injection for low and medium velocities (km/s range) [36], microwave [37], laser ablation [38] and railgun pellet injection (elevated velocities, 10 km/s range) as well as compact tori [39] or unmagnetized plasma injection [40] for high velocities (100 km/s range).…”

Section: Matter Injection Technology Reviewmentioning

confidence: 99%

Consequences of the technology survey and gap analysis on the EU DEMO R&D programme in tritium, matter injection and vacuum

Day

Butler

Giegerich

et al. 2016

Fusion Engineering and Design

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In the framework of the EUROfusion Programme, EU is preparing the conceptual design of the inner fuel cycle of a pulsed tokamak DEMO. This paper illustrates a quantified process to shape a R&D programme that exploits as much as possible previous R&D. In an initial step, the high-level requirements are collected and a novel DEMO inner fuel cycle architecture with its three subsystems vacuum pumping, matter injection (fuelling and injection of plasma enhancement gases) and tritium systems (tritium plant and breeder coolant purification) is delineated, driven by the DEMO key challenge to reduce tritium inventory. Then, a technology survey is carried out to review potential existing solutions for the required process functions and to assess their maturity and risks. Finally, a decision-making scheme is applied to select the most promising candidates. ITER technology is exploited where possible. As a primary result, a fuel cycle architecture is suggested with an advanced tritium plant that avoids full isotope separation in the main loop and with a Direct Internal Recycling path in the vacuum systems to shorten cycle times. For core fuelling, classical inboard pellet injection technology is selected, in principle similar to that proposed for ITER but aiming for higher launch speeds to achieve deep fuelling of the DEMO plasma. Based on these findings, a tailored R&D programme is shaped that tackles the key questions until 2020.

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“…In order to allow for a higher density in the launched and injected structure compared to the compact tori, it was proposed to use an unmagnetized plasma jet alternatively. However, at present only design studies and simulations [22] seem to be available for this technique. Nevertheless, this approach will be considered.…”

Section: Core Fuelling Technologies Considered For the Demo Matter Inmentioning

confidence: 99%

Considerations on the DEMO pellet fuelling system

Lang

Day

Fable

et al. 2015

Fusion Engineering and Design

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The Demonstration Fusion Power Reactor DEMO is the step foreseen to bridge the gap between ITER and the first commercial fusion power plant. One key element in the European work plan for DEMO is the elaboration of a conceptual design for a suitable core particle fuelling system. First considerations for such a system are presented in this contribution. Following the well-considered ITER solution, most analysis performed in this study assumes conventional pellet technology will be used for the fuelling system. However, taking advantage of the less compressed time frame for the DEMO project, several other techniques thought to bear potential for advanced fuelling performance are considered as well. In a first, basic analysis all actuation parameters at hand and their implications on the fuelling performance were considered. Tentative transport modelling of a reference scenario strongly indicates only particles deposited inside the plasma pedestal allow for efficient fuelling. Shallow edge fuelling results in an unbearable burden on the fuel cycle. Sufficiently deep particle deposition seems technically achievable, provided pellets are launched from the torus inboard at sufficient speed. All components required for a DEMO pellet system capable for high speed inboard pellet launch are already available or can be developed in due time with reasonable efforts. Furthermore, steps to integrate this solution into the EU DEMO model are taken.

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

Cited by 8 publications

References 21 publications

Emergent kink stability of a magnetized plasma jet injected into a transverse background magnetic field

Emergent kink stability of a magnetized plasma jet injected into a transverse background magnetic field

Consequences of the technology survey and gap analysis on the EU DEMO R&D programme in tritium, matter injection and vacuum

Considerations on the DEMO pellet fuelling system

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