Greifswald 2024 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 22: Plasma Wall Interaction II/HEPP VII

P 22.4: Vortrag

Donnerstag, 29. Februar 2024, 15:25–15:50, ELP 6: HS 4

Experimental studies of Hydrogen plasma produced in Pulsed Plasma Accelerator source — •Azmirah Ahmed, Sumit Singha, Pradipta P Kalita, Pallabi Baruah, Nirod K Neog, and Tridip K Borthakur — Centre of Plasma Physics-Institute for Plasma Research (CPP-IPR)

Hydrogen plasma is produced in a Pulsed Plasma Accelerator (PPA) source to simulate the heat loading phenomena of an ELM transient event of fusion devices. A 200 kJ Pulsed Power System (PPS) powers the PPA by delivering a discharge current pulse of 100 kA of half-time period ~ 0.5 ms. An accelerated plasma stream is produced which has a relatively high density and high velocity. An external longitudinal magnetic field of ~ 0.1 T in the observation region is generated using an electromagnet to study its effect on the plasma stream. Calorimetric study, high-speed imaging and OES is carried out for proper optimization of the plasma. The calorimetric study gives the measure of optimized energy density ~ 0.22 MJ/m2 of the hydrogen plasma. The imaging done using a high speed video camera shows the confinement, shape, uniformity and intensity distribution of plasma. The spectroscopic observations shows the emission from Hα and Hβ transitions of hydrogen and also the transitions of different impurity species generated during the plasma production. The interaction of this hydrogen plasma with a fusion relevant tungsten material is then studied by exposing the tungsten target. By using XRD and FESEM techniques, the impact on the material is studied and initial testing shows formation of major and micro cracks on tungsten.

Keywords: Pulsed Plasma Accelerator; Pulsed Power System; Hydrogen Plasma; Tungsten; Plasma matter interaction