Diamond-Coated Plasma Probes for Hot and Hazardous Plasmas
Abstract
:1. Introduction
- In the Axial Symmetric Divertor Experiment (ASDEX) Upgrade (one of the European MSTs) at the Max-Planck Institute for Plasma Physics in Garching near Munich [13], a graphite probe head (the so-called Innsbruck-Padua Probe (InnPadP)) with six cylindrical graphite pins [8,9,12] was inserted frequently up to about 4 mm inside the LCFS [14] (see Figure 1a). One of the probe pins (visible in the upper left corner) is protruding by 3 mm from the other five pins to also enable the measurement of radial profiles of the floating probe potential to obtain information on the radial electric field [11,14]. After numerous shots, the probe pins were visibly sputtered in such a way that the tips were “sharpened”, while their length was not altered (see Figure 1b).
- In a high-power impulse magnetron sputtering discharge (HiPIMS) [15] in copper, a combination of two CLPs and one EEP was used [16,17,18] (see Figure 2). The wires consisted of tungsten enclosed in alumina tubes. Within less than an hour, the Al2O3 tubes were covered by the sputtered material (Cu) and made electrically conductive. Only the EEP heating wire of tungsten remained clean due to the heating up to sufficient temperatures for electron emission, i.e., about 2000 K. Furthermore, the upper part of the double-bore Al2O3 tube carrying the tungsten loop of the EEP remained more or less uncoated.
- In the chemically very reactive magnetized potassium plasma of a Q-machine [19,20], W-wire probes and circular plane W-probes were also used, and the changes of their surfaces and of their IV- characteristics due to chemical reaction between potassium and Al2O3 and carbon hydrates were investigated [21,22]. These probes were special constructions with a heating wire around the Al2O3 tube which carried the probe wire. An additional BN tube was pushed over the heating wire for protection (see Figure 3). The heating was not as fully effective as intended, and it took several minutes until the W-probe could be considered sufficiently clean.
- ASDEX Upgrade (Axial Symmetric Divertor Experiment—further abbreviated as AUG) at the IPP (Max-Planck Institute for Plasma Physics) in Garching near Munich, Germany [13].
- TCV (Tokamak à Configuration Variable) at the Swiss Plasma Center (SPC) of the EPFL (École Polytechnique Fédérale de Lausanne) in Lausanne, Switzerland [26].
- MAST-U (Mega-Ampere Spherical Tokamak) at the CCFE (Culham Centre for Fusion Energy) in Culham, UK [27].
2. Materials and Methods
3. Results
3.1. Positive Effects
3.2. Negative Effects
3.3. Exemplary Results
4. Conclusions and Outlook
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Ionita, C.; Schrittwieser, R.; Xu, G.; Yan, N.; Wang, H.; Naulin, V.; Rasmussen, J.J.; Steinmüller-Nethl, D. Diamond-Coated Plasma Probes for Hot and Hazardous Plasmas. Materials 2020, 13, 4524. https://doi.org/10.3390/ma13204524
Ionita C, Schrittwieser R, Xu G, Yan N, Wang H, Naulin V, Rasmussen JJ, Steinmüller-Nethl D. Diamond-Coated Plasma Probes for Hot and Hazardous Plasmas. Materials. 2020; 13(20):4524. https://doi.org/10.3390/ma13204524
Chicago/Turabian StyleIonita, Codrina, Roman Schrittwieser, Guosheng Xu, Ning Yan, Huiqian Wang, Volker Naulin, Jens Juul Rasmussen, and Doris Steinmüller-Nethl. 2020. "Diamond-Coated Plasma Probes for Hot and Hazardous Plasmas" Materials 13, no. 20: 4524. https://doi.org/10.3390/ma13204524