Energy composition of high-energy neutral beams on the COMPASS tokamak

• Autorzy: Mitosinkova A. , Stöckel J. , Varju J. , Weinzettl V.

Identyfikatory

DOI

10.1515/nuka-2016-0069

• Konferencja: Summer School of Plasma Diagnostics PhDiaFusion 2015: “Soft X-ray Diagnostics for Fusion Plasma” (16-20.06.2015 ; Bezmiechowa, Poland)
• Języki publikacji: EN

Abstrakty

EN

The COMPASS tokamak is equipped with two identical neutral beam injectors (NBI) for additional plasma heating. They provide a beam of deuterium atoms with a power of up to ~(2 × 300) kW. We show that the neutral beam is not monoenergetic but contains several energy components. An accurate knowledge of the neutral beam power in each individual energy component is essential for a detailed description of the beam- -plasma interaction and better understanding of the NBI heating processes in the COMPASS tokamak. This paper describes the determination of individual energy components in the neutral beam from intensities of the Doppler-shifted Dα lines, which are measured by a high-resolution spectrometer viewing the neutral beam-line at the exit of NBI. Furthermore, the divergence of beamlets escaping single aperture of the last accelerating grid is deduced from the width of the Doppler-shifted lines. Recently, one of the NBI systems was modifi ed by the removal of the Faraday copper shield from the ion source. The comparison of the beam composition and the beamlet divergence before and after this modifi cation is also presented.

Słowa kluczowe

EN

tokamak; neutral beam injection (NBI); Doppler effect; beam composition; beamlet divergence

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2016
• Tom: Vol. 61, No. 4
• Strony: 419--423
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Mitosinkova A.

• Institute of Plasma Physics ASCR, v.v.i., Department of Surface and Plasma Science, Charles University in Prague, Za Slovankou 3, 18200, Praha 8, Czech Republic

autor

Stöckel J.

• Institute of Plasma Physics ASCR, v.v.i., Department of Surface and Plasma Science, Charles University in Prague, Za Slovankou 3, 18200, Praha 8, Czech Republic

autor

Varju J.

• Institute of Plasma Physics ASCR, v.v.i., Department of Surface and Plasma Science, Charles University in Prague, Za Slovankou 3, 18200, Praha 8, Czech Republic

autor

Weinzettl V.

• Institute of Plasma Physics ASCR, v.v.i., Department of Surface and Plasma Science, Charles University in Prague, Za Slovankou 3, 18200, Praha 8, Czech Republic

Bibliografia

• 1. Panek, R., Bilková, O., Fuchs, V., Hron, M., Chraska, P., Stockel, J., Urban, J., Weinzettl, V., Zajac, J., & Zacek, F. (2006). Reinstallation of the COMPASS-D tokamak in IPP ASCR. Czech. J. Phys., 56(Suppl. 2), B125–B137. DOI: 10.1007/s10582-006-0188-1.
• 2. Deichuli, P., Davydenko, V., Belov, V., Gorbovsky, A., & Dranichnikov, A. (2012). Commissioning of heating neutral beams for COMPASS-D tokamak. Rev. Sci. Instrum., 83, 02B114-1–02B114-3. DOI: 10.1063/1.3672108.
• 3. Uhlemann, R., Hemsworth, R. S., Wang, G., & Euringer, H. (1993). Hydrogen and deuterium ion species mix and injected neutral beam power fractions of the TEXTOR-PINIs for 20-60 kV determined by Doppler shift spectroscopy. Rev. Sci. Instrum., 64, 974–982.DOI: 10.1063/1.1144100.
• 4. Kim, J., & Haselton, H. H. (1979). Analysis of particle species evolution in neutral-beam injection lines. J. Appl. Phys., 50, 3802–3808. DOI: 10.1063/1.326504.
• 5. Deschamps, G. H., Falter, H. D., Hemsworth, R. S., & Massman, P. (1988). JET neutral beam species measurements by Doppler-shift spectroscopy. Plasma Phys. Fusion Technol., 1, 588–592.
• 6. Bilau Faust, R. (1991). Spectrometrical measurement of the species composition and beam divergence of hydrogen and deuterium beams the ASDEX NI-beamline ion sources and the HF sources. Garching bei Munchen: Max-Planck-Institut für Plasmaphysik. (IPP 4/245).
• 7. Werner, O., & Penningsfeld, F. P. (1993). Spectroscopic determination of species and divergence of hydrogen beams in the W7AS neutral beam injectors. Garching bei Munchen: Max-Planck-Institut für Plasmaphysik. (IPP 4/258).

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.