Parameters of supersonic astrophysically-relevant plasma jets collimating via poloidal magnetic field measured by x-ray spectroscopy method

31st International Conference on Equations of State for Matter

Filippov, E.D.^1 ; Pikuz, S.A.^1 ; Skobelev, I.Yu.^1 ; Ryazantsev, S.N.^1 ; Higginson, D.P.^2 ; Khaghani, D.^3 ; Revet, G.^4 ; Chen, S.N.^4 ; Fuchs, J.^4

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13 Bldg 2, Moscow

125412, Russia^1

Lawrence Livermore National Laboratory, East Ave 7000, Livermore

CA

94550, United States^2

GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrafie 1, Darmstadt

64291, Germany^3

Laboratoire Pour l'Utilisation des Lasers Intenses, CNRS-CEA, École Polytechnique, Physique Atomique dans les Plasmas Denses, Route de Saclay, Palaiseau

F-91128, France^4

关键词: External magnetic field;    Large aspect ratio;    Laser generated plasmas;    Poloidal magnetic field;    Relative intensity;    Spatial resolution;    Spatially resolved;    X-ray emission spectra;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012114/pdf
DOI  :  10.1088/1742-6596/774/1/012114

来源: IOP

【 摘 要 】

Application of external magnetic field to a laser-generated plasma flows allows to investigate stable, large aspect ratio plasma jets which are relevant to a number of astrophysical cases. In the experiment with 0.6 ns, 40 J laser pulses focused to 700 μm focal spot at solid CF2target in presence of 20 T poloidal magnetic field the parameters of the plasma jet were studied by means of spatially resolved x-ray spectroscopy. Focusing spectrometer with spatial resolution was used to record the temporally-integrated x-ray emission spectra of the plasma with spatial resolution along the jet propagation. Using the relative intensities of spectral lines emitted by F He-like ions, the electron temperature Teand density Neprofiles of the plasma are obtained. It is shown that Nedecreases monotonically in the case without B-field, but demonstrates an extended density profile up to 10 mm when 20 T magnetic field is applied. Nevalues are consistent with that observed via interferometry diagnostics, thus providing the confidence in our x-ray spectroscopy analysis techniques.