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Thio, Y. C. Francis; Knapp, Charles E.; Kirkpatrick, Ronald C.; Siemon, R. E.; Turchi, P. J.

doi:10.1023/a:1019813528507

Cited by 67 publications

(23 citation statements)

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“…The latter is envisioned as a standoff driver for MIF. 2, 3,6,7,47,48 The dynamics arising in the jet merging, e.g., shock formation, sets the properties of the subsequent, merged plasma that ultimately determines the liner uniformity and peak ram pressure (ρv 2 ). These physics issues have been considered recently via theory and numerical modeling.…”

Section: On the Use Of Merging Plasma Jets For Forming Sphericallmentioning

confidence: 99%

Experimental evidence for collisional shock formation via two obliquely merging supersonic plasma jets

et al. 2014

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We report spatially resolved measurements of the oblique merging of two supersonic laboratory plasma jets. The jets are formed and launched by pulsed-power-driven railguns using injected argon, and have electron density ∼ 10 14 cm −3 , electron temperature ≈ 1.4 eV, ionization fraction near unity, and velocity ≈ 40 km/s just prior to merging. The jet merging produces a few-cm-thick stagnation layer, as observed in both fastframing camera images and multi-chord interferometer data, consistent with collisional shock formation [E. C. Merritt et al., Phys. Rev. Lett. 111, 085003 (2013)].

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Section: On the Use Of Merging Plasma Jets For Forming Sphericallmentioning

confidence: 99%

Experimental evidence for collisional shock formation via two obliquely merging supersonic plasma jets

et al. 2014

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“…An advantage of the plasma liner approach in general [8][9][10], and the heavy liner approach in particular (this paper) is that there is no need for any direct material connections of the primary energy source and the target and, therefore, the "stand-off" problem is solved.…”

Section: Discussionmentioning

confidence: 99%

“…Potentially more attractive solution is offered by the concept of the plasma liner [8,9], in which very high Mach number jets would be generated by plasma guns situated on the walls of the explosion chamber and merge near the target, to form a 3D pusher for the target. This approach, in principle, allows avoiding the use of any material structures connecting the target with the "external world."…”

Section: Introductionmentioning

confidence: 99%

Plasma Liner with an Intermediate Heavy Shell and Thermal Pressure Drive

Ryutov

Thio

2006

Fusion Science and Technology

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One of the challenging problems of Magnetized Target Fusion is development of the ways of transporting energy to the target situated at a large-enough distance from the energy source: the distance should be such as to prevent damage to the permanent parts of the source. Several schemes have been considered in the past, including the use of particle beams coupled with the inverse diode, mechanical projectiles in combination with magneto-compressional generators, and the plasma liner. In this paper, a possible modification of the original concept of the plasma liner (Y.C.F. Thio, C.E. Knapp, R.C. Kirkpatrick, R.E. Siemon, P.J. Turchi. J. Fusion Energy, 20, 1, 2001) is described. The modification consists in creating a thin, higher density shell made of a high-Z plasma and accelerating it onto an MTF target by a thermal pressure of a hydrogen plasma with the temperature ~ 10 eV. We discuss constraints on the parameters of this system and evaluate convergence ratio that can be expected.

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“…To test the possibility of a standoff driver [34,35] (one without physical leads to the liner thus avoiding repetitive hardware destruction), a plasma liner formed from multiple plasma jets [17,18] is being pursued again at LANL, i.e., plasma-jet-driven MIF or PJMIF, funded by an ARPA-E for the next 3 years under its accelrating low-cost plasma heating and assembly (ALPHA) program. A 2.7-meter diameter spherical vacuum chamber is the centerpiece of the plasma liner experiment (PLX) at LANL, which has also conducted basic plasma shock experiments [19,20,36,37] using two plasma railguns that were developed by HyperV Technologies Corporation.…”

Section: Recent Progressmentioning

confidence: 99%

Magneto-Inertial Fusion

et al. 2015

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In this community white paper, we describe an approach to achieving fusion which employs a hybrid of elements from the traditional magnetic and inertial fusion concepts, called magneto-inertial fusion (MIF). The status of MIF research in North America at multiple institutions is summarized including recent progress, research opportunities, and future plans.Keywords Magneto-inertial fusion Á Magnetized target fusion Á Liner Á Plasma jets Á Fusion energy Á MagLIF DescriptionMagneto-inertial fusion (MIF) (aka magnetized target fusion) [1][2][3] is an approach to fusion that combines the compressional heating of inertial confinement fusion (ICF) with the magnetically reduced thermal transport and magnetically enhanced alpha heating of magnetic confinement fusion (MCF). From an MCF perspective, the higher density, shorter confinement times, and compressional heating as the dominant heating mechanism reduce the impact of instabilities. From an ICF perspective, the primary benefits are potentially orders of magnitude reduction in the difficult to achieve qr parameter (areal density), and potentially significant reduction in velocity requirements and hydrodynamic instabilities for compression drivers. In fact, ignition becomes theoretically possible from qr B 0.01 g/cm 2 up to conventional ICF values of qr * 1.0 g/cm 2 , and as in MCF, Br rather than qr becomes the key figure-of-merit for ignition because of the enhanced alpha deposition [4]. Within the lower-qr parameter space, MIF exploits lower required implosion velocities (2-100 km/s, compared to the ICF minimum of 350-400 km/s) allowing the use of much more efficient (g C 0.3) pulsed power drivers, while at the highest (i.e., ICF) end of the qr range, both higher gain G at a given implosion velocity as well as lower implosion velocity and reduced hydrodynamic instabilities are theoretically possible. To avoid confusion, it must be emphasized that the wellknown conventional ICF burn fraction formula does not apply for the lower-qr ''liner-driven'' MIF schemes, since it is the much larger mass and qr of the liner (and not that of the burning fuel) that determines the ''dwell time'' and fuel burnup fraction. In all cases, MIF approaches seek to satisfy/ exceed the inertial fusion energy (IFE) figure-of-merit gG * 7-10 required in an economical plant with reasonable recirculating power fraction. A great advantage of MIF is indeed its extremely wide parameter space which allows it greater versatility in overcoming difficulties in implementation or technology, as evidenced by the four diverse approaches and associated implosion velocities shown in Fig. 1.MIF approaches occupy an attractive region in thermonuclear q-T parameter space, as shown in a paper by

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Cited by 67 publications

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Experimental evidence for collisional shock formation via two obliquely merging supersonic plasma jets

Experimental evidence for collisional shock formation via two obliquely merging supersonic plasma jets

Plasma Liner with an Intermediate Heavy Shell and Thermal Pressure Drive

Magneto-Inertial Fusion

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