Design, fabrication, and operation of a high-energy liner implosion experiment at 16 megamperes

Turchi, P. J.; Alvey, K.; Adams, C. S.; Anderson, Brendon G.; Anderson, H. L.; Anderson, William E.; Armijo, E.; Atchison, W.L.; Bartos, J.; Bowers, R.L.; Cameron, Bernard J.; Cavazos, T.; Coffey, S.K.; Corrow, R.; Degnan, J.H.; Echave, J.; Froggett, B.; Gale, D.; Garcia, Felix Perez; Guzik, Joyce A.; Henneke, B.; Kanzleiter, R.; Kiuttu, G.F.; Lebeda, C.; Olson, Russell; Oró, D.; Parker, J.V.; Peterkin, R.E.; Peterson, Kyle; Pritchett, R.L.; Randolph, R. B.; Reinovsky, R.E.; Roberts, J. P.; Rodriguez, George; Sandoval, D.; Sandoval, G.; Salazar, M.; Sommars, W.; Steckle, Warren P.; Stokes, John; Studebaker, J.; Tabaka, L.J.; Taylor, Antoinette J.

doi:10.1109/tps.2002.805447

Cited by 19 publications

(4 citation statements)

References 11 publications

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“…To avoid the consequences of Rayleigh-Taylor instability, without actually stabilizing the liner as in LINUS, we may use solid-density liners of high precision [28] to reduce the initial amplitudes of perturbations. While necessary, mechanical precision by itself is not sufficient to achieve satisfactory performance and several subtler features of the electrical waveform and amplitude driving the liner must be considered [29].…”

Section: Discussionmentioning

confidence: 99%

Imploding Liner Compression of Plasma: Concepts and Issues

Turchi

2008

IEEE Trans. Plasma Sci.

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Several plasma targets have been proposed for compression by imploding liners, ranging from magnetically-confined to wall-supported concepts. In all cases, a critical issue remains one of preventing the high atomic-number material of the liner from penetrating the plasma and countering the gain in plasma temperature sought by compression. Two factors foster development of such deleterious penetration: the creation of a liquid/vapor layer at the liner surface at high magnetic fields, and disruption of this layer by Rayleigh-Taylor instability in the final stages of plasma compression. Within a general consideration of issues of liner compression of plasma, we discuss reactor cost optimization by use of plasma at pressures intermediate between the values of conventional magnetically-or inertially-confined fusion concepts. We also describe the development of an equilibrium layer of vapor adjacent to the liner surface at high magnetic fields, the instability of such a thin layer, and the consequences of liner deceleration and rebound for reactor concepts and research progress.

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Section: Discussionmentioning

confidence: 99%

Imploding Liner Compression of Plasma: Concepts and Issues

Turchi

2008

IEEE Trans. Plasma Sci.

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“…End-effect instabilities were first identified as potentially problematic for MagLIF liners in Ref. [8], though others had previously observed them [82,83] and developed mitigation strategies such as conical electrode surfaces (referred to as "glide planes") [84][85][86].…”

Section: Liner Implosion Design Work To Improve Implosion Stability Amentioning

confidence: 99%

Implementing and diagnosing magnetic flux compression on the Z pulsed power accelerator

McBride

Bliss

Gómez

et al. 2015

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We report on the progress made to date for a Laboratory Directed Research and Development (LDRD) project aimed at diagnosing magnetic flux compression on the Z pulsed-power accelerator (0-20 MA in 100 ns). Each experiment consisted of an initially solid Be or Al liner (cylindrical tube), which was imploded using the Z accelerator's drive current (0-20 MA in 100 ns). The imploding liner compresses a 10-T axial seed field, B z (0), supplied by an independently driven Helmholtz coil pair. Assuming perfect flux conservation, the axial field amplification should be well described by B z (t) = B z (0) × [R(0)/R(t)] 2 , where R is the liner's inner surface radius. With perfect flux conservation, B z (t) and dB z /dt values exceeding 10 4 T and 10 12 T/s, respectively, are expected. These large values, the diminishing liner volume, and the harsh environment on Z, make it particularly challenging to measure these fields. We report on our latest efforts to do so using three primary techniques: (1) micro B-dot probes to measure the fringe fields associated with flux compression, (2) streaked visible Zeeman absorption spectroscopy, and (3) fiber-based Faraday rotation. We also mention two new techniques that make use of the neutron diagnostics suite on Z. These techniques were not developed under this LDRD, but they could influence how we prioritize our efforts to diagnose magnetic flux compression on Z in the future. The first technique is based on the yield ratio of secondary DT to primary DD reactions. The second technique makes use of the secondary DT neutron time-of-flight energy spectra. Both of these techniques have been used successfully to infer the degree of magnetization at stagnation in fully integrated Magnetized Liner Inertial Fusion (MagLIF) experiments on Z [

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“…Steady improvement in power flow geometries, in liner designs, in fabrication techniques, and especially in radiographic diagnostics (Figure 4) accelerated the development of ultra-high precision liner implosions and development of the diagnostic techniques used to evaluate those implosions 6 With the improvement in radiographic diagnostics, came more detailed assessment of the behavior of the magnetic field / metal interface where the aluminum liner is heated by the driving current which can be 10's MA in some cases. As magnetic fields at the interface approach 1 MG during the early stages of the implosion (exceeding 1MG in the later stages) the surface of the aluminum conductor is at least melted, in many case spending part of its life in the region of mixed two phase composition under the vapor dome.…”

Section: Linersmentioning

confidence: 99%

Pulsed Power Hydrodynamics: Atlas Results and Future Perspectives

Reinovsky

Atchison

Dimonte

et al. 2007

2007 IEEE 34th International Conference on Plasma Science (ICOPS)

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Pulsed Power Hydrodynamics (PPH) is a new application of low-impedance, pulsed power technology to the study of complex hydrodynamics, instabilities, turbulence, and material properties in a highly precise, controllable environment at the extremes of pressure and material velocity. The Atlas facility, designed and built by Los Alamos, is the world's first, and only, laboratory pulsed power system designed specifically to explore this relatively new family of pulsed power applications. Constructed in the year 2000 and commissioned in August 2001, Atlas is a 24-MJ high-performance capacitor bank delivering currents up to 30-Megamperes with a rise time of 5 to 6-µsec. The high-precision, cylindrically imploding liner is the tool most frequently used to convert electromagnetic energy into the hydrodynamic (particle kinetic) energy needed to drive strong shocks, quasi-isentropic compression, or large volume, adiabatic compression for the experiments. At typical parameters, a 30-gr, 1-mm-thick liner with an initial radius of 5-cm, and an intermediate current of 20-MA can be accelerated to 7.5-km/sec producing megabar shocks in medium density targets. Velocities up to 20km/sec and pressures >20-Mbar in high density targets are possible.

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Design, fabrication, and operation of a high-energy liner implosion experiment at 16 megamperes

Cited by 19 publications

References 11 publications

Imploding Liner Compression of Plasma: Concepts and Issues

Imploding Liner Compression of Plasma: Concepts and Issues

Implementing and diagnosing magnetic flux compression on the Z pulsed power accelerator

Pulsed Power Hydrodynamics: Atlas Results and Future Perspectives

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