A Renewed Capability for Gas Puff Science on Sandia's Z Machine. Jones, B., Jennings, C. A., Lamppa, D. C., Hansen, S. B., Harvey-Thompson, A. J., Ampleford, D. J., Cuneo, M. E., Strizic, T., Johnson, D., Jones, M. C., Moore, N. W., Flanagan, T. M., McKenney, J. L., Waisman, E. M., Coverdale, C. A., Krishnan, M., Coleman, P. L., Elliott, K. W., Madden, R. E., Thompson, J., Bixler, A., Thornhill, J. W., Giuliani, J. L., Chong, Y. K., Velikovich, A. L., Dasgupta, A., & Apruzese, J. P. IEEE Transactions on Plasma Science, 42(5):1145--1152, May, 2014.
doi  abstract   bibtex   
A comprehensive gas puff capability is being developed on the Z pulsed power generator. We describe the methodology employed for developing a gas puff load on Z, which combines characterization and modeling of the neutral gas mass flow from a supersonic nozzle, numerical modeling of the implosion of this mass profile, and experimental evaluation of these magnetic implosions on Z. We are beginning a multiyear science program to study gas puff z-pinch physics at high current, starting with an 8-cm diameter double-shell nozzle, which delivers a column of Ar gas that is imploded by the machine's fast current pulse. The initial shots have been designed using numerical simulation with two radiation-magnetohydrodynamic codes. These calculations indicate that 1 mg/cm should provide optimal coupling to the driver and 1.6:1 middle:outer shell mass ratio will best balance the need for high implosion velocity against the need to mitigate the magnetic Rayleigh-Taylor instability. The models suggest 300-500-kJ Ar K-shell yield should be achievable on Z, and we report an initial commissioning shot at lower voltage in which 250 kJ was measured. Future experiments will pursue optimization of Ar and Kr K-shell X-ray sources, study fusion in deuterium gas puffs, and investigate the physics of gas puff implosions including energy coupling, instability growth, and radiation generation.
@article{jones_renewed_2014,
	title = {A {Renewed} {Capability} for {Gas} {Puff} {Science} on {Sandia}'s {Z} {Machine}},
	volume = {42},
	issn = {0093-3813},
	doi = {10.1109/TPS.2013.2287180},
	abstract = {A comprehensive gas puff capability is being developed on the Z pulsed power generator. We describe the methodology employed for developing a gas puff load on Z, which combines characterization and modeling of the neutral gas mass flow from a supersonic nozzle, numerical modeling of the implosion of this mass profile, and experimental evaluation of these magnetic implosions on Z. We are beginning a multiyear science program to study gas puff z-pinch physics at high current, starting with an 8-cm diameter double-shell nozzle, which delivers a column of Ar gas that is imploded by the machine's fast current pulse. The initial shots have been designed using numerical simulation with two radiation-magnetohydrodynamic codes. These calculations indicate that 1 mg/cm should provide optimal coupling to the driver and 1.6:1 middle:outer shell mass ratio will best balance the need for high implosion velocity against the need to mitigate the magnetic Rayleigh-Taylor instability. The models suggest 300-500-kJ Ar K-shell yield should be achievable on Z, and we report an initial commissioning shot at lower voltage in which 250 kJ was measured. Future experiments will pursue optimization of Ar and Kr K-shell X-ray sources, study fusion in deuterium gas puffs, and investigate the physics of gas puff implosions including energy coupling, instability growth, and radiation generation.},
	number = {5},
	journal = {IEEE Transactions on Plasma Science},
	author = {Jones, B. and Jennings, C. A. and Lamppa, D. C. and Hansen, S. B. and Harvey-Thompson, A. J. and Ampleford, D. J. and Cuneo, M. E. and Strizic, T. and Johnson, D. and Jones, M. C. and Moore, N. W. and Flanagan, T. M. and McKenney, J. L. and Waisman, E. M. and Coverdale, C. A. and Krishnan, M. and Coleman, P. L. and Elliott, K. W. and Madden, R. E. and Thompson, J. and Bixler, A. and Thornhill, J. W. and Giuliani, J. L. and Chong, Y. K. and Velikovich, A. L. and Dasgupta, A. and Apruzese, J. P.},
	month = may,
	year = {2014},
	keywords = {Argon, Feeds, Gas puff, Integrated circuit modeling, K-shell X-ray sources, K-shell radiation, Laboratories, Load modeling, Magnetohydrodynamics, Numerical models, Rayleigh-Taylor instability, Sandia Z machine, X-ray production, X-ray production., Z pinch, Z pulsed power generator, argon gas, comprehensive gas puff capability, deuterium gas puffs, double-shell nozzle, energy 250 kJ, energy 300 kJ to 500 kJ, energy coupling, explosions, gas puff z pinch physics, high implosion velocity, initial shots, instability growth, machine fast current pulse, magnetic Rayleigh-Taylor instability, magnetic implosions, magnetohydrodynamics (MHDs), mass profile, middle-outer shell mass ratio, multiyear science program, neutral gas mass flow, nozzles, numerical analysis, numerical model, numerical simulation, optimal coupling, optimization, plasma X-ray sources, plasma magnetohydrodynamics, plasma pinch, plasma simulation, radiation generation, radiation-magnetohydrodynamic codes, size 8 cm, supersonic nozzle},
	pages = {1145--1152}
}

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