### Abstract

Original language | English |
---|---|

Pages (from-to) | 209-216 |

Number of pages | 7 |

Journal | Canadian Journal of Physics |

Volume | 86 |

Issue number | 1 |

DOIs | |

Publication status | Published - Jan 2008 |

### Fingerprint

### Keywords

- Maxwellian plasmas
- astrophysics
- electron energy distributions
- collisional ionization equilibrium

### Cite this

*Canadian Journal of Physics*,

*86*(1), 209-216. https://doi.org/10.1139/P07-159

}

*Canadian Journal of Physics*, vol. 86, no. 1, pp. 209-216. https://doi.org/10.1139/P07-159

**Analog and digital simulations of Maxwellian plasmas for astrophysics.** / Savin, D.W.; Badnell, N.R.; Beiersdorfer, P.; Beck, B.R.; Brown, G.V.; Bryans, P.; Gorczyca, T.W.; Gu, M.F.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Analog and digital simulations of Maxwellian plasmas for astrophysics

AU - Savin, D.W.

AU - Badnell, N.R.

AU - Beiersdorfer, P.

AU - Beck, B.R.

AU - Brown, G.V.

AU - Bryans, P.

AU - Gorczyca, T.W.

AU - Gu, M.F.

N1 - Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.

PY - 2008/1

Y1 - 2008/1

N2 - Many astrophysical and laboratory plasmas possess Maxwell-Boltzmann (MB) electron energy distributions (EEDs). Interpreting or predicting the properties of these plasmas requires accurate knowledge of atomic processes such as radiative lifetimes, electron impact excitation and de-excitation, electron impact ionization, radiative recombination, dielectronic recombination, and charge transfer, all for thousands of levels or more. Plasma models cannot include all of the needed levels and atomic data. Hence, approximations need to be made to make the models tractable. Here we report on an "analog" technique we have developed for simulating a Maxwellian EED using an electron beam ion trap and review some recent results using this method. A subset of the atomic data needed for modeling Maxwellian plasmas relates to calculating the ionization balance. Accurate fractional abundance calculations for the different ionization stages of the various elements in the plasma are needed to reliably interpret or predict the properties of the gas. However, much of the atomic data needed for these calculations have not been generated using modem theoretical methods and are often highly suspect. Here we will also review our recent updating of the recommended atomic data for "digital" computer simulations of MB plasmas in collisional ionization equilibrium (CIE), describe the changes relative to previously recommended CIE calculations, and discuss what further recombination and ionization data are needed to improve this latest set of recommended CIE calculations.

AB - Many astrophysical and laboratory plasmas possess Maxwell-Boltzmann (MB) electron energy distributions (EEDs). Interpreting or predicting the properties of these plasmas requires accurate knowledge of atomic processes such as radiative lifetimes, electron impact excitation and de-excitation, electron impact ionization, radiative recombination, dielectronic recombination, and charge transfer, all for thousands of levels or more. Plasma models cannot include all of the needed levels and atomic data. Hence, approximations need to be made to make the models tractable. Here we report on an "analog" technique we have developed for simulating a Maxwellian EED using an electron beam ion trap and review some recent results using this method. A subset of the atomic data needed for modeling Maxwellian plasmas relates to calculating the ionization balance. Accurate fractional abundance calculations for the different ionization stages of the various elements in the plasma are needed to reliably interpret or predict the properties of the gas. However, much of the atomic data needed for these calculations have not been generated using modem theoretical methods and are often highly suspect. Here we will also review our recent updating of the recommended atomic data for "digital" computer simulations of MB plasmas in collisional ionization equilibrium (CIE), describe the changes relative to previously recommended CIE calculations, and discuss what further recombination and ionization data are needed to improve this latest set of recommended CIE calculations.

KW - Maxwellian plasmas

KW - astrophysics

KW - electron energy distributions

KW - collisional ionization equilibrium

UR - http://dx.doi.org/10.1139/P07-159

U2 - 10.1139/P07-159

DO - 10.1139/P07-159

M3 - Article

VL - 86

SP - 209

EP - 216

JO - Canadian Journal of Physics

JF - Canadian Journal of Physics

SN - 0008-4204

IS - 1

ER -