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# Energy balance and ionization dynamics in an imploding Z-pinch plasma

## By: Gregorian, L.; Kroupp, E.; Maron, Y.; Bernshtam, V.; Ralchenko, Yu.V.; Davara, G.;

2000 / IEEE / 0-7803-5982-8

### Description

This item was taken from the IEEE Conference ' Energy balance and ionization dynamics in an imploding Z-pinch plasma ' Summary form only given. The results of our spectroscopic study of the energy balance history during the implosion phase of a 300 kA, 1 /spl mu/s gas-puff z-pinch plasma are presented. Using the measured spectral line profiles and intensities of singly- to five-fold ionized oxygen ions we obtained the time-dependent radial distributions of the magnetic field, electron density, electron temperature, radial velocity, and the mean ion charge. These parameters were used for determining as a function of time and radius all the terms of the momentum and energy equations as used in a standard 1-D MHD modelling scheme. For the analysis we follow the evolution of the plasma parameters within a few mass elements. In detail, the Joule heating of electrons is calculated using the current density obtained from the magnetic-field measurements, and the electrical conductivity shown to be classical (Spitzer). The plasma compressional heating is calculated using the radial velocity gradient and the total (p/sub e/+p/sub i/) thermal pressure, which is obtained from the measured electron temperature and density, the measured mean ion charge, and the ion temperature, estimated using the calculated electron-ion energy transfer rate. The electron heat flux is calculated using the measured electron temperature gradient. The electron energy losses due to excitation, radiation, and ionization, are determined using detailed collisional-radiative calculations. Analysis of the energy balance and the plasma acceleration shows that the previously observed propagation of the ionization front, and the resulting ion charge-state distribution across the plasma shell are consistent with the heating rates calculated using the experimentally determined MHD parameters.

**Related Topics**

Engineering

Velocity Measurement

Z Pinch

Explosions

Ionisation

Spectral Line Breadth

Spectral Line Intensity

1 Mus

Energy Balance

Ionization Dynamics

Imploding Z-pinch Plasma

Implosion Phase

Gas-puff Z-pinch Plasma

Spectral Line Profiles

Spectral Line Intensities

Singly-ionized Oxygen Ions

Five-fold Ionized Oxygen Ions

Time-dependent Radial Distributions

Magnetic Field

Electron Density

Electron Temperature

Radial Velocity

Mean Ion Charge

Momentum Equations

Energy Equations

Standard 1-d Mhd Modelling Scheme

Doubly-ionized Oxygen Ions

Three-fold Ionized Oxygen Ions

Four-fold Ionized Oxygen Ions

Joule Heating

Plasma Parameters

Current Density

Magnetic Field Measurements

Classical Electrical Conductivity

Spitzer Electrical Conductivity

Plasma Compressional Heating

Radial Velocity Gradient

Thermal Pressure

Ion Temperature

Electron-ion Energy Transfer Rate

Electron Heat Flux

Electron Energy Losses

Collisional-radiative Calculations

Ion Charge-state Distribution

Mhd Parameters

Plasma Shell

Ionization Front

300 Ka

Ionization

Plasma Measurements

Plasma Temperature

Electrons

Density Measurement

Current Measurement

Temperature Measurement

Plasma Density

Charge Measurement

Plasma Diagnostics