Residual gas analysis for long-pulse, advanced tokamak operation

Klepper, C. C.; Hillis, D. L.; Bucalossi, J.; Douai, D.; Oddon, P.; Vartanian, S.; Colas, L.; Manenc, L.; Pégourié, B.
October 2010
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10E104
Academic Journal
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.


Related Articles

  • Investigation of quantum efficiencies in multilayered photocathodes for microchannel plate... Ze, Frederick; Landen, Otto L.; Bell, Perry M.; Turner, Robert E.; Tutt, Teresa; Alvarez, Sharon S.; Costa, Robert L. // Review of Scientific Instruments;Jan1999, Vol. 70 Issue 1, p659 

    Discusses investigation of quantum efficiencies in multilayered photocathodes for microchannel plate (MCP) applications and the study of laser-plasma interactions. Goal of increasing the overall photocathode quantum efficiency at the input of the MCP; Effect of pairing transmission photocathode...

  • Sawtooth stabilization by barely trapped energetic electrons. Deng Zhou; Shaojie Wang; Cheng Zhang // Physics of Plasmas;Jun2005, Vol. 12 Issue 6, p062512 

    The barely trapped energetic electrons produced by the electron cyclotron resonance heating can interact efficiently with the internal kink mode and stabilize sawtooth oscillations. The effects of the spatial distribution and the pitch angle distribution of the energetic electrons are...

  • On the role of graphite chamber-wall lining in experiments on the ion-cyclotron resonance plasma heating in the globus-M spherical tokamak. Ayushin, B. B.; Varfolomeev, V. I.; Gusev, V. K.; D'yachenko, V. V.; Petrov, Yu. V.; Sakharov, N. V.; Khitrov, S. A.; Chernyshev, F. V.; Shcherbinin, O. N. // Technical Physics Letters;Jan2009, Vol. 35 Issue 1, p76 

    Comparative results of experiments on the ion-cyclotron resonance (ICR) heating of plasma in the Globus-M spherical tokamak using a hydrogen-deuterium mixture are presented. The experimental data are analyzed over a long period of time during which the internal surface of the chamber walls was...

  • Removal NO x from Lean Exhaust Gas by Absorption on Oxi-Anionic Materials. Cremona, A.; Fornasari, G.; Livi, M.; Petrini, G.; Trifirò, F.; Vaccari, A.; Vogna, E. // Catalysis Letters;Nov2008, Vol. 125 Issue 3/4, p386 

    NO x sorption/desorption capacities of Oxi-Anionic materials were measured under representative exhaust gas mixture conditions at 300 °C, with a NO x trap containing CaO and CuO x impregnated over a commercial γ-Al2O3. These systems absorb (or adsorb) NO x in a gas stream containing...

  • Simulations of Tokamak Discharges with Fast L�H Transitions. Leonov, V. M. // Plasma Physics Reports;Jan2002, Vol. 28 Issue 1, p1 

    Results are presented from the simulations of discharges with fast L�H transitions in the JET tokamak. During a transition, electron temperature perturbations propagate into the plasma core over a time much shorter than the transport time characteristic of this device. It is shown that the...

  • Physical Results of the T-10 Tokamak. Dnestrovskij, Yu. N. // Plasma Physics Reports;Oct2001, Vol. 27 Issue 10, p825 

    The history of the T-10 tokamak and scientific results obtained over the last 15�20 years are reviewed. The following issues are discussed in detail: electron cyclotron resonance heating (ECRH), the consistency of the electron temperature profiles, the density limit, the electron cyclotron...

  • Radially localized measurement of superthermal electrons using oblique electron cyclotron emission. Preische, S.; Efthimion, P.C.; Kaye, S.M. // Physics of Plasmas;Nov96, Vol. 3 Issue 11, p4065 

    Shows that radial localization of optically thin electron cyclotron emission from superthermal electrons can be imposed by observation of emission upshifted from the thermal cyclotron resonance in the horizontal midplane of a tokamak. Superthermal electron density profile; Moments of the...

  • A full wave theory of high-harmonic fast wave absorption in high-beta plasmas. Lashmore-Davies, C.N.; Fuchs, V. // Physics of Plasmas;Jun98, Vol. 5 Issue 6, p2284 

    Proposes a theory of fast wave absorption in high-beta conditions of spherical tokamaks. Utilization of reduced, second order, ordinary differential equation; Analysis of the ion cyclotron interactions of the fast wave; Absorption characteristics of electrons and ions under high-beta,...

  • Nonresonant suppression of the sawtooth instability by passing ions in tokamaks. Lazaros, Avrilios // Physics of Plasmas;Aug2001, Vol. 8 Issue 8 

    A new interpretation is presented for the well-known observation of sawteeth stabilization, during ion cyclotron resonant heating, in the Joint European Tokamak [Campbell et al., Phys. Rev. Lett. 60, 2148 (1988)] and the Tokamak Fusion Test Reactor [Phillips et al., Phys. Fluids B 4, 2155...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics