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Griener M, Schmitz O, Bald K, et al. Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes. Rev Sci Instrum. 2017;88(3):033509doi: 10.1063/1.4978629.
Griener, M., Schmitz, O., Bald, K., Bösser, D., Cavedon, M., De Marné, P., Eich, T., Fuchert, G., Herrmann, A., Kappatou, A., Lunt, T., Rohde, V., Schweer, B., Sochor, M., Stroth, U., Terra, A., Wolfrum, E. (2017). Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes. The Review of scientific instruments, 88(3), 033509. https://doi.org/10.1063/1.4978629
Griener, M, et al. "Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes." The Review of scientific instruments vol. 88,3 (2017): 033509. doi: https://doi.org/10.1063/1.4978629
Griener M, Schmitz O, Bald K, Bösser D, Cavedon M, De Marné P, Eich T, Fuchert G, Herrmann A, Kappatou A, Lunt T, Rohde V, Schweer B, Sochor M, Stroth U, Terra A, Wolfrum E. Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes. Rev Sci Instrum. 2017 Mar;88(3):033509. doi: 10.1063/1.4978629. PMID: 28372367.
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Rev Sci Instrum. 2017 Mar;88(3):033509. doi: 10.1063/1.4978629.

Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes.

The Review of scientific instruments

M Griener, O Schmitz, K Bald, D Bösser, M Cavedon, P De Marné, T Eich, G Fuchert, A Herrmann, A Kappatou, T Lunt, V Rohde, B Schweer, M Sochor, U Stroth, A Terra, E Wolfrum,

Affiliations

  1. Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany.
  2. Department of Engineering Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
  3. Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany.
  4. FZ Jülich, Institute for Energy- and Climate Research, 52428 Jülich, Germany.

PMID: 28372367 DOI: 10.1063/1.4978629

Abstract

In magnetically confined fusion plasmas controlled gas injection is crucial for plasma fuelling as well as for various diagnostic applications such as active spectroscopy. We present a new, versatile system for the injection of collimated thermal gas beams into a vacuum chamber. This system consists of a gas pressure chamber, sealed by a custom made piezo valve towards a small capillary for gas injection. The setup can directly be placed inside of the vacuum chamber of fusion devices as it is small and immune against high magnetic fields. This enables gas injection close to the plasma periphery with high duty cycles and fast switch on/off times ≲ 0.5 ms. In this work, we present the design details of this new injection system and a systematic characterization of the beam properties as well as the gas flowrates which can be accomplished. The thin and relatively short capillary yields a small divergence of the injected beam with a half opening angle of 20°. The gas box is designed for pre-fill pressures of 10 mbar up to 100 bars and makes a flowrate accessible from 10

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