Parameter space of low frequency inter-ELM modes

B. Vanovac, E. Wolfrum, M. Willensdorfer, M. Griener, A. F. Mink, G. F. Harrer, M. Hoelzl

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Introduction: The ELM cycle of type-I ELMs consists of different phases characterized by the evolution of kinetic profiles on different time scales [1] and distinct MHD and turbulence activity. In the latest phase of the ELM cycle, the pressure gradients are clamped. During this phase low [2], medium [3] and high frequency [4] MHD modes develop simultaneously in the steep gradient region. The high-frequency modes are located close to the minimum of the Er well, and are measured as fluctuations in the radial magnetic field on both, low and high field side [4]. The focus of the work presented here is the low-frequency modes. The low frequency
modes are measured only at the low field side and are located further inwards, towards the pedestal top [5]. They appear as fluctuations in the electron density, the electron temperature and as magnetic fluctuations. These modes rotate poloidally in the electron diamagnetic direction
with the velocity of the background flow at that position [5]. The nature of this mode is not yet clear. In this work, we show the dependences of the low-frequency mode characteristics on some of the plasma and ELM parameters.
LanguageEnglish
Title of host publication45th EPS Conference on Plasma Physics, EPS 2018
EditorsC. Michaut, J. Berndt, M. Mantsinen, S. Coda, G. Lapenta, S. Weber
Place of PublicationMulhouse
PublisherEuropean Physical Society (EPS)
Pages833-836
Number of pages4
ISBN (Electronic)9781510868441
StatePublished - 1 Jan 2018
Event45th European Physical Society Conference on Plasma Physics, (EPS 2018) - Prague, Czech Republic
Duration: 2 Jul 20186 Jul 2018
https://eps2018.eli-beams.eu/en/

Conference

Conference45th European Physical Society Conference on Plasma Physics, (EPS 2018)
Abbreviated titleEPS 2018
CountryCzech Republic
CityPrague
Period2/07/186/07/18
Internet address

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low frequencies
cycles
pressure gradients
turbulence
electron energy
gradients
kinetics
profiles
magnetic fields
electrons

Cite this

Vanovac, B., Wolfrum, E., Willensdorfer, M., Griener, M., Mink, A. F., Harrer, G. F., & Hoelzl, M. (2018). Parameter space of low frequency inter-ELM modes. In C. Michaut, J. Berndt, M. Mantsinen, S. Coda, G. Lapenta, & S. Weber (Eds.), 45th EPS Conference on Plasma Physics, EPS 2018 (pp. 833-836). Mulhouse: European Physical Society (EPS).
Vanovac, B. ; Wolfrum, E. ; Willensdorfer, M. ; Griener, M. ; Mink, A. F. ; Harrer, G. F. ; Hoelzl, M./ Parameter space of low frequency inter-ELM modes. 45th EPS Conference on Plasma Physics, EPS 2018. editor / C. Michaut ; J. Berndt ; M. Mantsinen ; S. Coda ; G. Lapenta ; S. Weber. Mulhouse : European Physical Society (EPS), 2018. pp. 833-836
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abstract = "Introduction: The ELM cycle of type-I ELMs consists of different phases characterized by the evolution of kinetic profiles on different time scales [1] and distinct MHD and turbulence activity. In the latest phase of the ELM cycle, the pressure gradients are clamped. During this phase low [2], medium [3] and high frequency [4] MHD modes develop simultaneously in the steep gradient region. The high-frequency modes are located close to the minimum of the Er well, and are measured as fluctuations in the radial magnetic field on both, low and high field side [4]. The focus of the work presented here is the low-frequency modes. The low frequencymodes are measured only at the low field side and are located further inwards, towards the pedestal top [5]. They appear as fluctuations in the electron density, the electron temperature and as magnetic fluctuations. These modes rotate poloidally in the electron diamagnetic directionwith the velocity of the background flow at that position [5]. The nature of this mode is not yet clear. In this work, we show the dependences of the low-frequency mode characteristics on some of the plasma and ELM parameters.",
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Vanovac, B, Wolfrum, E, Willensdorfer, M, Griener, M, Mink, AF, Harrer, GF & Hoelzl, M 2018, Parameter space of low frequency inter-ELM modes. in C Michaut, J Berndt, M Mantsinen, S Coda, G Lapenta & S Weber (eds), 45th EPS Conference on Plasma Physics, EPS 2018. European Physical Society (EPS), Mulhouse, pp. 833-836, 45th European Physical Society Conference on Plasma Physics, (EPS 2018), Prague, Czech Republic, 2/07/18.

Parameter space of low frequency inter-ELM modes. / Vanovac, B.; Wolfrum, E.; Willensdorfer, M.; Griener, M.; Mink, A. F.; Harrer, G. F.; Hoelzl, M.

45th EPS Conference on Plasma Physics, EPS 2018. ed. / C. Michaut; J. Berndt; M. Mantsinen; S. Coda; G. Lapenta; S. Weber. Mulhouse : European Physical Society (EPS), 2018. p. 833-836.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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N2 - Introduction: The ELM cycle of type-I ELMs consists of different phases characterized by the evolution of kinetic profiles on different time scales [1] and distinct MHD and turbulence activity. In the latest phase of the ELM cycle, the pressure gradients are clamped. During this phase low [2], medium [3] and high frequency [4] MHD modes develop simultaneously in the steep gradient region. The high-frequency modes are located close to the minimum of the Er well, and are measured as fluctuations in the radial magnetic field on both, low and high field side [4]. The focus of the work presented here is the low-frequency modes. The low frequencymodes are measured only at the low field side and are located further inwards, towards the pedestal top [5]. They appear as fluctuations in the electron density, the electron temperature and as magnetic fluctuations. These modes rotate poloidally in the electron diamagnetic directionwith the velocity of the background flow at that position [5]. The nature of this mode is not yet clear. In this work, we show the dependences of the low-frequency mode characteristics on some of the plasma and ELM parameters.

AB - Introduction: The ELM cycle of type-I ELMs consists of different phases characterized by the evolution of kinetic profiles on different time scales [1] and distinct MHD and turbulence activity. In the latest phase of the ELM cycle, the pressure gradients are clamped. During this phase low [2], medium [3] and high frequency [4] MHD modes develop simultaneously in the steep gradient region. The high-frequency modes are located close to the minimum of the Er well, and are measured as fluctuations in the radial magnetic field on both, low and high field side [4]. The focus of the work presented here is the low-frequency modes. The low frequencymodes are measured only at the low field side and are located further inwards, towards the pedestal top [5]. They appear as fluctuations in the electron density, the electron temperature and as magnetic fluctuations. These modes rotate poloidally in the electron diamagnetic directionwith the velocity of the background flow at that position [5]. The nature of this mode is not yet clear. In this work, we show the dependences of the low-frequency mode characteristics on some of the plasma and ELM parameters.

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Vanovac B, Wolfrum E, Willensdorfer M, Griener M, Mink AF, Harrer GF et al. Parameter space of low frequency inter-ELM modes. In Michaut C, Berndt J, Mantsinen M, Coda S, Lapenta G, Weber S, editors, 45th EPS Conference on Plasma Physics, EPS 2018. Mulhouse: European Physical Society (EPS). 2018. p. 833-836.