Abstract
The eclipse laser photo-detachment (LPD) method has been introduced to avoid Langmuir probe (LP) surface ablation. This method uses, besides a laser pulse and a LP, a blocking wire (BW) to create a shadow around the LP. The BW masks the probe surface from laser photons avoiding, therefore, probe ablation. In return, the BW prevents photo-detachment within the shadowed area breaking the axial symmetry of the plasma surrounding the probe. This work studies the response of an electronegative plasma to laser pulse, in eclipse LPD experiment, via a two dimensional Particle-In-Cell/Monte Carlo Collision model. The plasma dynamics and LPD signals are simulated in the presence and the absence of BW. Our results show that potential patterns form around the LP after negative ions photo-detachment. In the absence of BW, the formed potential patterns accelerate electrons towards the LP; while in the presence of the BW, the potential pattern formed within the shadowed area obstructs the electron transport in the latter direction. Thus, the LPD signal is significantly affected by the presence of the BW.
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