Relative shift in position of temperature and density pedestals at the COMPASS tokamak.

Bílková, Petra; Böhm, Petr; Komm, Michael; Frassinetti, L.; Štefániková, E.; Peterka, Matěj; Šos, Miroslav; Seidl, Jakub; Grover, Ondřej; Havlíček, Josef; Bogár, Klára; Varju, Jozef; Vondráček, Petr; Urban, Jakub; Imríšek, Martin; Markovič, Tomáš; Weinzettl, Vladimír; Hron, Martin; Pánek, Radomír

Number of the records: 1

Relative shift in position of temperature and density pedestals at the COMPASS tokamak.

1.

SYSNO ASEP	0482690
Document Type	C - Proceedings Paper (int. conf.)
R&D Document Type	Conference Paper
Title	Relative shift in position of temperature and density pedestals at the COMPASS tokamak.
Author(s)	Bílková, Petra (UFP-V)_RID Böhm, Petr (UFP-V)_RID Komm, Michael (UFP-V)_{RID, ORCID} Frassinetti, L. (SE) Štefániková, E. (SE) Peterka, Matěj (UFP-V)_{RID, ORCID} Šos, Miroslav (UFP-V)_ORCID Seidl, Jakub (UFP-V)_RID Grover, Ondřej (UFP-V)_ORCID Havlíček, Josef (UFP-V)_{RID, ORCID} Bogár, Klára (UFP-V)_ORCID Varju, Jozef (UFP-V)_ORCID Vondráček, Petr (UFP-V)_{RID, ORCID} Urban, Jakub (UFP-V)_RID Imríšek, Martin (UFP-V)_RID Markovič, Tomáš (UFP-V)_RID Weinzettl, Vladimír (UFP-V)_{RID, ORCID} Hron, Martin (UFP-V)_{RID, ORCID} Pánek, Radomír (UFP-V)_RID
Article number	P2.120
Source Title	EPS 2017: 44th European Physical Society Conference on Plasma Physics, 41F. - Mulhouse : European Physical Society, 2017 / Fajardo M. ; Westerhof E. ; Riconda C. ; Melzer A. ; Bret A. ; Dromey B. - ISBN 979-10-96389-07
Number of pages	4 s.
Publication form	Online - E
Action	EPS 2017 Conference on Plasma Physics/44./
Event date	26.06.2017 - 30.06.2017
VEvent location	Belfast
Country	IE - Ireland
Event type	EUR
Language	eng - English
Country	FR - France
Keywords	tokamak ; COMPASS ; plasma
Subject RIV	BL - Plasma and Gas Discharge Physics
OECD category	Fluids and plasma physics (including surface physics)
R&D Projects	GA14-35260S GA ČR - Czech Science Foundation (CSF)
Institutional support	UFP-V - RVO:61389021
Annotation	Recent analysis performed on ASDEX Upgrade, NSTX and DIII-D suggest that the density profile position plays an important role in pedestal stability [1,2,3]. On JET and ASDEX Upgrade, it has been observed that the electron temperature and electron density profiles can have different relative pedestal positions (so-called relative shift). As shown in [4,5], the increase of the relative shift is correlated with the reduction in the normalized pressure gradient, leading to a weakening of the pedestal stability. Therefore, in this work, analysis of the effect of the relative shift has been carried on the COMPASS tokamak discharges. The dataset used for analysis was obtained during two dedicated experimental campaigns in 2015 and 2016 [6]. Systematic measurements of pedestal structure were performed in Ohmic and NBIassisted Type I ELMy H-modes [7]. For PNBI exceeding 200 kW the electron pedestal temperature reached 300 eV, allowing to achieve pedestal collisionality Vped* < 1 at q95 ~3. Measurements during the last 30% of the ELM cycle were considered for analysis.
Workplace	Institute of Plasma Physics
Contact	Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
Year of Publishing	2018

Number of the records: 1