X-ray Spectroscopy Based Diagnostic of GigaGauss Magnetic Fields during Relativistic Laser-Plasma Interactions

Abstract

GigaGauss (GG), and even multi-GG magnetic fields are expected to be developed during relativistic laser-plasma interactions. Sub-GG magnetic fields were previously measured by a method using the self-generated harmonics of the laser frequency, and the fact that the magnetized plasma is birefringent and/or optically active depending on the propagation direction of the electromagnetic wave. In the present short communication, we outline an idea for a method of measuring GG magnetic fields based on the phenomenon of Langmuir-wave-caused dips (L-dips) in X-ray line profiles. The L-dips were observed in several experimental spectroscopic studies of relativistic laser-plasma interactions. Ultrastrong magnetic fields affect the separation of the L-dips from one another, so that this relative shift can be used to measure such fields.

On Invariant Vectors in the Presence of Electric and Magnetic Fields

“…The effect of a magnetic field on spectral line shapes, with or without an additional electric field, is an important topic of atomic physics (see, for example, the non-exhaustive list of references: [95][96][97][98][99][100][101][102][103][104]), for astrophysical or magnetic-fusion applications, both from the theoretical side and for the interpretation of Z-pinch experiments, for instance.…”