Extending helium partial pressure measurement technology to JET DTE2 and ITER

C. C. Klepper; T. M. Biewer; U. Kruezi; S. Vartanian; D. Douai; D. L. Hillis; C. Marcus

doi:10.1063/1.4963713

Extending helium partial pressure measurement technology to JET DTE2 and ITER

C. C. Klepper, T. M. Biewer, U. Kruezi, S. Vartanian, D. Douai, D. L. Hillis, C. Marcus

Diagnostics and Control

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Abstract

The detection limit for helium (He) partial pressure monitoring via the Penning discharge optical emission diagnostic, mainly used for tokamak divertor effluent gas analysis, is shown here to be possible for He concentrations down to 0.1% in predominantly deuterium effluents. This result from a dedicated laboratory study means that the technique can now be extended to intrinsically (non-injected) He produced as fusion reaction ash in deuterium-tritium experiments. The paper also examines threshold ionization mass spectroscopy as a potential backup to the optical technique, but finds that further development is needed to attain with plasma pulse-relevant response times. Both these studies are presented in the context of continuing development of plasma pulse-resolving, residual gas analysis for the upcoming JET deuterium-tritium campaign (DTE2) and for ITER.

Original language	English
Article number	11D442
Journal	Review of Scientific Instruments
Volume	87
Issue number	11
DOIs	https://doi.org/10.1063/1.4963713
State	Published - Nov 1 2016

Funding

The work was supported, in part, by the U.S. DOE under Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Funders	Funder number
U.S. DOE	DE-AC05-00OR22725
Horizon 2020 Framework Programme	633053
H2020 Euratom

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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abstract = "The detection limit for helium (He) partial pressure monitoring via the Penning discharge optical emission diagnostic, mainly used for tokamak divertor effluent gas analysis, is shown here to be possible for He concentrations down to 0.1% in predominantly deuterium effluents. This result from a dedicated laboratory study means that the technique can now be extended to intrinsically (non-injected) He produced as fusion reaction ash in deuterium-tritium experiments. The paper also examines threshold ionization mass spectroscopy as a potential backup to the optical technique, but finds that further development is needed to attain with plasma pulse-relevant response times. Both these studies are presented in the context of continuing development of plasma pulse-resolving, residual gas analysis for the upcoming JET deuterium-tritium campaign (DTE2) and for ITER.",

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AU - Klepper, C. C.

AU - Biewer, T. M.

AU - Kruezi, U.

AU - Vartanian, S.

AU - Douai, D.

AU - Hillis, D. L.

AU - Marcus, C.

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Extending helium partial pressure measurement technology to JET DTE2 and ITER

Abstract

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