Residual gas analysis for long-pulse, advanced tokamak operation

C. C. Klepper; D. L. Hillis; J. Bucalossi; D. Douai; P. Oddon; S. Vartanian; L. Colas; L. Manenc; B. Ṕgourí

doi:10.1063/1.3474660

Residual gas analysis for long-pulse, advanced tokamak operation

C. C. Klepper, D. L. Hillis, J. Bucalossi, D. Douai, P. Oddon, S. Vartanian, L. Colas, L. Manenc, B. Ṕgourí

Diagnostics and Control

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

A shielded residual gas analyzer (RGA) system on Tore Supra can function during plasma operation and is set up to monitor the composition of the neutral gas in one of the pumping ducts of the toroidal pumped limited. This "diagnostic RGA" has been used in long-pulse (up to 6 min) discharges for continuous monitoring of up to 15 masses simultaneously. Comparison of the RGA-measured evolution of the H₂ / D₂ isotopic ratio in the exhaust gas to that measured by an energetic neutral particle analyzer in the plasma core provides a way to monitor the evolution of particle balance. RGA monitoring of corrective H₂ injection to maintain proper minority heating is providing a database for improved ion cyclotron resonance heating, potentially with RGA-base feedback control. In very long pulses (>4 min) absence of significant changes in the RGA-monitored, hydrocarbon particle pressures is an indication of proper operation of the actively cooled, carbon-based plasma facing components. Also H₂ could increase due to thermodesorption of overheated plasma facing components.

Original language	English
Article number	10E104
Journal	Review of Scientific Instruments
Volume	81
Issue number	10
DOIs	https://doi.org/10.1063/1.3474660
State	Published - Oct 2010

Funding

This work, supported by the European Communities under the contract of Association between EURATOM and CEA, was carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission. The ORNL work was funded by the U.S. Department of Energy under Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC. The authors wish to dedicate this paper in fond memory of ORNL’s J. E. Simpkins, who installed the first, fully shielded RGA on Tore Supra in 1989 and Ch. Brosset of CEA/IRFM, who brought this diagnostic to its present level of continuous and long-pulse compatible operation.

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725
California Earthquake Authority
H2020 Euratom

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abstract = "A shielded residual gas analyzer (RGA) system on Tore Supra can function during plasma operation and is set up to monitor the composition of the neutral gas in one of the pumping ducts of the toroidal pumped limited. This {"}diagnostic RGA{"} has been used in long-pulse (up to 6 min) discharges for continuous monitoring of up to 15 masses simultaneously. Comparison of the RGA-measured evolution of the H2 / D2 isotopic ratio in the exhaust gas to that measured by an energetic neutral particle analyzer in the plasma core provides a way to monitor the evolution of particle balance. RGA monitoring of corrective H2 injection to maintain proper minority heating is providing a database for improved ion cyclotron resonance heating, potentially with RGA-base feedback control. In very long pulses (>4 min) absence of significant changes in the RGA-monitored, hydrocarbon particle pressures is an indication of proper operation of the actively cooled, carbon-based plasma facing components. Also H2 could increase due to thermodesorption of overheated plasma facing components.",

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AU - Hillis, D. L.

AU - Bucalossi, J.

AU - Douai, D.

AU - Oddon, P.

AU - Vartanian, S.

AU - Colas, L.

AU - Manenc, L.

AU - Ṕgourí, B.

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Residual gas analysis for long-pulse, advanced tokamak operation

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UN SDGs

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