Greifswald 2024 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 6: Poster I

P 6.11: Poster

Montag, 26. Februar 2024, 16:30–18:30, ELP 6: Foyer

Investigation of a plasma window arc discharge for particle beam transmission to high pressure targets — •Fateme Ghaznavi — Goethe University, Frankfurt am Main, Germany

A Plasma window [1] is a device which can be used to separate two different pressure levels, allowing for an unperturbed transmission of ion beams from the accelerator vacuum to high pressure targets. This sealing effect is provided by an arc discharge, burning along the ion beam transmission axis. At Goethe University Frankfurt, we constructed a plasma window, featuring an aperture of 5mm, using an 98%Ar-2%H₂ working gas compound and currents between 60-120 A with a flow rate between 1-4 slm. The aim of this study is to investigate the plasma physical characteristics of this arc discharge. A spectroscopic system is adjusted along the discharge axis to allow for a simultaneous estimation of the electron temperature and density at 4 different positions. They were found to range between 1-1.5 eV for the electron temperature and 0.6-3.8·10¹⁶ cm³ for the electron density, reaching 30% higher pressures compared to previous measurements utilizing the same aperture with lower currents [2].

[1] Hershcovitch, A. High-pressure arcs as vacuum-atmosphere interface and plasma lens for nonvacuum electron beam welding machines, electron beam melting, and nonvacuum ion material modification J. Appl. Phys., AIP Publishing, 1995, 78, 5283

[2] B. F. Bohlender Characterization of a plasma window as a membrane free transition between vacuum and high pressure Physical review accelerators and beams 23, 2020

Keywords: Plasma Window; Beam transmission