First results from the neutral particle analyzer on the COMPASS tokamak

0474056 - ÚFP 2018 RIV IT eng C - Conference Paper (international conference)
Bogár, Klára - Melnik, A. - Tomeš, Matěj - Stöckel, Jan - Janky, Filip - Komm, Michael - Imríšek, Martin - Háček, Pavel - Varju, Jozef - Weinzettl, Vladimír
First results from the neutral particle analyzer on the COMPASS tokamak.
Proceedings of Science: 1st EPS Conference on Plasma Diagnostics, ECPD 2015. Frascati: Proceedings of Science (PoS), 2015, č. článku (ECPD2015)074. PoS. ISSN 1824-8039.
[EPS Conference on Plasma Diagnostics, ECPD 2015/1./. Frascati (IT), 14.04.2015-17.04.2015]
R&D Projects: GA MŠMT(CZ) LM2011021; GA ČR(CZ) GA15-10723S
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021
Keywords : COMPASS tokamak * Edge localized modes * Neutral Particle Analyzer (NPA)
OECD category: Fluids and plasma physics (including surface physics)

The Neutral Particle Analyzer (NPA) for the COMPASS tokamak was recently upgraded and absolutely
calibrated in the Ioffe Institute, St. Petersburg. NPA allows simultaneous measurements of the
energy spectra of fast hydrogen and deuterium atoms and determination of the ion temperature. Energy
spectra of the neutral fluxes are measured by NPA in Ohmic as well as in the NBI heated plasmas. The
measured ion temperature in L-mode plasmas varies in the range of 300-500 eV. After the L-H transition,
the ion temperature increases by ΔTi ≈ 250 eV. A relatively high temporal resolution of the NPA data
acquisition system allows study of fast transient phenomena, such as the Edge Localized Mode and sawtooth
oscillation.
Comparative measurement of Ti in the plasma core given by NPA and at the plasma edge using
Retarding Field Analyzer is also reported.
Permanent Link: http://hdl.handle.net/11104/0271196