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Cavity ring-down spectroscopy to measure negative ion density in a helicon plasma source for fusion neutral beams.
Journal article

Cavity ring-down spectroscopy to measure negative ion density in a helicon plasma source for fusion neutral beams.

  • Agnello R Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland.
  • Barbisan M Consorzio RFX, Corso Stati Uniti 4, I-35127 Padova, Italy.
  • Furno I Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland.
  • Guittienne P Helyssen, Route de la Louche 31, CH-1092 Belmont-sur-Lausanne, Switzerland.
  • Howling AA Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland.
  • Jacquier R Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland.
  • Pasqualotto R Consorzio RFX, Corso Stati Uniti 4, I-35127 Padova, Italy.
  • Plyushchev G Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland.
  • Andrebe Y Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland.
  • Béchu S Université Grenoble-Alpes, CNRS, Grenoble INP, LPSC-INP23, 38000 Grenoble, France.
  • Morgal I CEA, IRFM, F-13108 St-Paul-lez-Durance, France.
  • Simonin A CEA, IRFM, F-13108 St-Paul-lez-Durance, France.
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  • 2018-11-08
Published in:
  • The Review of scientific instruments. - 2018
Instrumentation
English Cavity Ring Down Spectroscopy (CRDS) is used to measure the D- absolute density produced in the helicon plasma reactor RAID (Resonant Antenna Ion Device) at the Swiss Plasma Center. The birdcage geometry of the helicon antenna produces a homogeneous, high-density plasma column (n e ≅ 1.5 × 1018 m-3 in H2 and D2 at 0.3 Pa and 3 kW of input power) 1.4 m long. We present the CRDS experimental setup, its positioning on the RAID reactor, and how the mechanical and thermal effects of the plasma affect the measurement. First results in deuterium plasma confirm the production of negative ions (D-) with a significant density: an average value of 3.0 × 1016 m-3 of D- is obtained at 0.3 Pa and 5 kW of power input in Cs-free plasma. This result is in good agreement with calculations performed with the collisional radiative code YACORA.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://sonar.ch/global/documents/92873
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