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dc.contributor.authorTheodorsen, Audun
dc.contributor.authorGarcia, Odd Erik
dc.contributor.authorKube, Ralph
dc.contributor.authorLaBombard, Brian
dc.contributor.authorTerry, James L.
dc.date.accessioned2019-02-05T09:39:21Z
dc.date.available2019-02-05T09:39:21Z
dc.date.issued2018-12-18
dc.description.abstractLarge-amplitude, intermittent fluctuations are ubiquitous in the boundary region of magnetically confined plasmas and lead to detrimental plasma-wall interactions in the nextgeneration, high duty cycle fusion power experiments. Using gas puff imaging data time series from the scrape-off layer in the Alcator C-Mod device, it is here demonstrated that the large-amplitude fluctuations can be described as a super-position of pulses with fixed shape and constant duration. By applying a new deconvolution algorithm on the data time series with a two-sided exponential pulse function, the arrival times and amplitudes of the pulses can be estimated and the measurement time series can be reconstructed with high accuracy. The pulse amplitudes are shown to follow an exponential distribution. The waiting times between pulses are uncorrelated, their distribution has an exponential tail, and the number of arrivals is a linear function of time. This demonstrates that pulse arrivals follow a homogeneous Poisson process. Identical statistical properties apply to both ohmic and high confinement mode plasmas, clearly demonstrating universality of the fluctuation statistics in the boundary region of Alcator C-Mod.en_US
dc.description.sponsorshipThe U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using User Facility Alcator C-Mod, under Award No. DE-FC02-99ER54512-CMOD. A.T., O.E.G.en_US
dc.descriptionThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in (citation of published article) and may be found at <a href=http://doi.org/10.1063/1.5064744>http://doi.org/10.1063/1.5064744</a>.en_US
dc.identifier.citationTheodorsen, A., Garcia, O. E., Kube, R., LaBombard, B. & Terry, J. L. (2018). Universality of Poisson-driven plasma fluctuations in the Alcator C-Mod scrape-off layer. <i>Physics of Plasmas, 25</i>, 122309. http://doi.org/10.1063/1.5064744en_US
dc.identifier.cristinIDFRIDAID 1648164
dc.identifier.doi10.1063/1.5064744
dc.identifier.issn1070-664X
dc.identifier.issn1089-7674
dc.identifier.urihttps://hdl.handle.net/10037/14607
dc.language.isoengen_US
dc.publisherAIP Publishingen_US
dc.relation.journalPhysics of Plasmas
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/FRINATEK/240510/Norway/Turbulence and transport at the boundary of fusion plasmas//en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430en_US
dc.titleUniversality of Poisson-driven plasma fluctuations in the Alcator C-Mod scrape-off layeren_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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