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Study of the transi...
Study of the transition from self-organised to homogeneous plasma distribution in chromium HiPIMS discharge
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- Slapanska, M. (författare)
- Masaryk Univ, Dept Phys Elect, Kotlarska 2, CZ-61137 Brno, Czech Republic.
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- Hecimovic, A. (författare)
- Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany.;Ruhr Univ Bochum, Inst Expt Phys 2, D-44801 Bochum, Germany.
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- Gudmundsson, Jon Tomas, 1965- (författare)
- KTH,Rymd- och plasmafysik,Univ Iceland, Sci Inst, Dunhaga 3, IS-107 Reykjavik, Iceland.
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- Hnilica, J. (författare)
- Masaryk Univ, Dept Phys Elect, Kotlarska 2, CZ-61137 Brno, Czech Republic.
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- Breilmann, W. (författare)
- Ruhr Univ Bochum, Inst Expt Phys 2, D-44801 Bochum, Germany.
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- Vasina, P. (författare)
- Masaryk Univ, Dept Phys Elect, Kotlarska 2, CZ-61137 Brno, Czech Republic.
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- von Keudell, A. (författare)
- Ruhr Univ Bochum, Inst Expt Phys 2, D-44801 Bochum, Germany.
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Masaryk Univ, Dept Phys Elect, Kotlarska 2, CZ-61137 Brno, Czech Republic Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany.;Ruhr Univ Bochum, Inst Expt Phys 2, D-44801 Bochum, Germany. (creator_code:org_t)
- 2020-02-07
- 2020
- Engelska.
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Ingår i: Journal of Physics D. - : IOP PUBLISHING LTD. - 0022-3727 .- 1361-6463. ; 53:15
- Relaterad länk:
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https://doi.org/10.1...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The self-organised plasma patterns, known as spokes or ionisation zones in magnetron sputtering discharges, were observed in a wide range of power densities, from low power direct current magnetron sputtering (dcMS) discharge to high power impulse magnetron sputtering (HiPIMS) discharge. For some target materials and non-reactive gases, it was observed that at very high power densities (>3 kW cm(-2)) the plasma exhibits a transition from a regime where spokes are observed to a homogeneous plasma regime. In this contribution, we present a comparison of plasma properties: plasma emission (optical emission spectroscopy) and flux of argon and chromium ions (mass spectrometry), measured both in the spoke regime and in the homogeneous plasma regime, aimed to expand the understanding of the plasma transition between the two modes. A simple biased flat probe was used to distinguish between the spoke regime and the homogeneous plasma regime. It was found that the flux of multiply charged ions (Ar2+, Cr2+, Cr3+, Cr4+) increases abruptly at the transition between the spoke regime and the homogeneous plasma regime. Similarly, the emission from Cr+ ions exhibits a strong increase of about 50% when the plasma torus becomes homogeneous. These observations are interpreted as an increase in electron temperature and a change in the electron heating mode, from a combination of secondary electron heating and Ohmic heating towards pure Ohmic heating. The transition to the homogeneous plasma regime and pure Ohmic heating is only observed in non-reactive HiPIMS discharges for target atoms with the second ionisation potential higher than the first ionisation potential of Ar (15.76 eV), and a self-sputter yield larger than 1.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- HiPIMS
- Ohmic heating
- optical emission spectroscopy
- mass spectrometry
- spokes
- chromium
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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