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First results from the neutral particle analyzer on the COMPASS tokamak
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SYSNO ASEP 0474056 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title First results from the neutral particle analyzer on the COMPASS tokamak Author(s) Bogár, Klára (UFP-V) ORCID
Melnik, A. (RU)
Tomeš, Matěj (UFP-V)
Stöckel, Jan (UFP-V) RID
Janky, Filip (UFP-V) RID
Komm, Michael (UFP-V) RID, ORCID
Imríšek, Martin (UFP-V) RID
Háček, Pavel (UFP-V) RID, ORCID
Varju, Jozef (UFP-V) ORCID
Weinzettl, Vladimír (UFP-V) RID, ORCIDArticle number (ECPD2015)074 Source Title Proceedings of Science: 1st EPS Conference on Plasma Diagnostics, ECPD 2015. - Frascati : Proceedings of Science (PoS), 2015 - ISSN 1824-8039 Number of pages 9 s. Publication form Print - P Action EPS Conference on Plasma Diagnostics, ECPD 2015/1./ Event date 14.04.2015 - 17.04.2015 VEvent location Frascati Country IT - Italy Event type EUR Language eng - English Country IT - Italy Keywords COMPASS tokamak ; Edge localized modes ; Neutral Particle Analyzer (NPA) Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects LM2011021 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA15-10723S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 EID SCOPUS 84959019556 Annotation 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.Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
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