Time resolved X-ray emission diagnostics in an axis-symmetric simple mirror trap

Abstract

A: Time resolved characterization of plasma X-ray emission represents an innovative technique to characterize non-equilibrium phases in Electron Cyclotron Resonance Ion Sources (ECRIS). Indeed, although ECRIS plasmas are usually in dynamical equilibrium, many relevant phenomena are characterized by fast transients and require a dedicated diagnostics to be fully investigated. In particular, time resolved diagnostics can be applied to characterize the X ray emission during the plasma turn on and off and during the turbulence phenomena induced by Cyclotron-Maser instability. This paper presents the experimental set-up used during the last campaign at measurement carried out at the Istituto Nazionale Fisica Nucleare -Laboratori Nazionali del Sud (INFN-LNS), together with the main achieved results. Particular relevance will be given to the characterization of the afterglow phase, which highlighted the existence of two electron populations characterized by different mean lifetime. Evidences of X-ray bursts emission in the afterglow phase, compatible with Cyclotron Maser instability, will be also shown. K: Coherent instabilities; Ion sources (positive ions, negative ions, electron cyclotron resonance (ECR), electron beam (EBIS)); Plasma generation (laser-produced, RF, x ray-produced); X-ray detectors 1Corresponding author.

Multidiagnostics setups for magnetoplasmas devoted to astrophysics and nuclear astrophysics research in compact traps

“…• Alternatively, the RF probe can be connected with a diode and an oscilloscope (more details can be found in [7]) in order to obtain the time-resolved but totally integrated power emitted from the plasma, using this value as trigger signal for instability signature and to perform time resolved X-ray analysis too.…”