Historical research guide · 1106 · 2005
Electron-temperature and energy-flow history in an imploding plasma
L. Gregorian · E. Kroupp · G. Davara · A. Starobinets · V. I. Fisher · V. A. Bernshtam · Yu. V. Ralchenko · Y. Maron · A. Fisher · D. H. H. Hoffmann
In one minute
The authors reconstruct the radial electron-temperature history of a 0.6-microsecond, 220-kA gas-puff z-pinch. They used spatially resolved emission lines from oxygen ions, from singly to fivefold ionized, while the plasma imploded up to 50 nanoseconds before maximum compression. Combined with previously determined radial profiles of electron density, plasma radial velocity, and magnetic field, the temperature data allowed an energy-accounting comparison of deposition and dissipation. At that phase, they found that about 65% of the energy deposited in the plasma went into radial flow; the remainder became internal energy and radiation. This does not describe every stage of the pinch: it bounds the observed phase and the channels named in the abstract. It shows why temperature measurements are essential for following where plasma energy goes.
Connection
It ties temperature to motion, density, fields, and radiation in one experiment, turning an image of an implosion into a constrained energy-flow account.
From the source
The study examines a 0.6-microsecond, 220-kA gas-puff z-pinch plasma. Its subject is an imploding laboratory plasma, not a general model for every pinch.Publisher abstract, opening sentence
Spatially resolved line emission from oxygen ions, ranging from singly to fivefold ionized, was used to study the time-dependent radial distribution of electron temperature.Publisher abstract, temperature diagnostic
The measurements cover the implosion through a point up to 50 nanoseconds before maximum compression. The abstract does not claim that this temperature history covers later stagnation or every phase of the discharge.Publisher abstract, observation window
The temperature profile was considered alongside previously determined radial distributions of electron density, plasma radial velocity, and magnetic field. Those quantities let the authors compare plasma energy deposition and dissipation rates.Publisher abstract, combined radial profiles and energy comparison
At the described phase, about 65% of the energy deposited in the plasma was imparted to radial flow. The remaining share was converted into internal energy and radiation.Publisher abstract, energy-flow result
A useful next measurement would extend the same radial temperature, density, velocity, and field accounting beyond the stated 50-nanosecond window, while keeping the energy channels separately reported.Publisher abstract, observation window and energy-accounting inputs
The way in
https://doi.org/10.1103/physreve.71.056402How to cite it
L. Gregorian, E. Kroupp, G. Davara, A. Starobinets, V. I. Fisher, V. A. Bernshtam, Yu. V. Ralchenko, Y. Maron, A. Fisher, D. H. H. Hoffmann (2005) Electron-temperature and energy-flow history in an imploding plasma doi:10.1103/physreve.71.056402