Observation of the bulk ion density peaking in a discharge with an impurity hole in the LHD

A. Perek, K. Ida, M. Yoshinuma, M. Goto, Y. Nakamura, M. Emoto, R. Jaspers

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Uittreksel

Radial profiles of bulk ion and impurity ions density are simultaneously measured and quantified using charge exchange spectroscopy and peaking parameter, Cv. The peaking parameter is positive for inward and negative for outward convection in a plasma with an impurity hole in the Large Helical Device. Following the formation of an impurity hole associated with the transition from L-mode to ion ITB plasma, the bulk ion becomes peaked by the inward convection (Cv>0), while impurities (helium and carbon) become hollow due to the outward convection (Cv<0). In contrast to the ion ITB plasma, in the L-mode plasma the impurity profiles are peaked (Cv>0), where the bulk ion density profile remains flat (Cv∼0). Understanding of the impurity behavior in the ion ITB plasma could lead to a self cleaning plasma reactor concept, with an efficient impurity exhaust.

Originele taal-2Engels
Artikelnummer076040
TijdschriftNuclear Fusion
Volume57
Nummer van het tijdschrift7
DOI's
StatusGepubliceerd - 7 jun 2017

Vingerafdruk

impurities
convection
ions
profiles
charge exchange
cleaning
hollow
helium
reactors
carbon
spectroscopy

Citeer dit

Perek, A. ; Ida, K. ; Yoshinuma, M. ; Goto, M. ; Nakamura, Y. ; Emoto, M. ; Jaspers, R. / Observation of the bulk ion density peaking in a discharge with an impurity hole in the LHD. In: Nuclear Fusion. 2017 ; Vol. 57, Nr. 7.
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abstract = "Radial profiles of bulk ion and impurity ions density are simultaneously measured and quantified using charge exchange spectroscopy and peaking parameter, Cv. The peaking parameter is positive for inward and negative for outward convection in a plasma with an impurity hole in the Large Helical Device. Following the formation of an impurity hole associated with the transition from L-mode to ion ITB plasma, the bulk ion becomes peaked by the inward convection (Cv>0), while impurities (helium and carbon) become hollow due to the outward convection (Cv<0). In contrast to the ion ITB plasma, in the L-mode plasma the impurity profiles are peaked (Cv>0), where the bulk ion density profile remains flat (Cv∼0). Understanding of the impurity behavior in the ion ITB plasma could lead to a self cleaning plasma reactor concept, with an efficient impurity exhaust.",
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Observation of the bulk ion density peaking in a discharge with an impurity hole in the LHD. / Perek, A.; Ida, K.; Yoshinuma, M.; Goto, M.; Nakamura, Y.; Emoto, M.; Jaspers, R.

In: Nuclear Fusion, Vol. 57, Nr. 7, 076040, 07.06.2017.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Observation of the bulk ion density peaking in a discharge with an impurity hole in the LHD

AU - Perek, A.

AU - Ida, K.

AU - Yoshinuma, M.

AU - Goto, M.

AU - Nakamura, Y.

AU - Emoto, M.

AU - Jaspers, R.

PY - 2017/6/7

Y1 - 2017/6/7

N2 - Radial profiles of bulk ion and impurity ions density are simultaneously measured and quantified using charge exchange spectroscopy and peaking parameter, Cv. The peaking parameter is positive for inward and negative for outward convection in a plasma with an impurity hole in the Large Helical Device. Following the formation of an impurity hole associated with the transition from L-mode to ion ITB plasma, the bulk ion becomes peaked by the inward convection (Cv>0), while impurities (helium and carbon) become hollow due to the outward convection (Cv<0). In contrast to the ion ITB plasma, in the L-mode plasma the impurity profiles are peaked (Cv>0), where the bulk ion density profile remains flat (Cv∼0). Understanding of the impurity behavior in the ion ITB plasma could lead to a self cleaning plasma reactor concept, with an efficient impurity exhaust.

AB - Radial profiles of bulk ion and impurity ions density are simultaneously measured and quantified using charge exchange spectroscopy and peaking parameter, Cv. The peaking parameter is positive for inward and negative for outward convection in a plasma with an impurity hole in the Large Helical Device. Following the formation of an impurity hole associated with the transition from L-mode to ion ITB plasma, the bulk ion becomes peaked by the inward convection (Cv>0), while impurities (helium and carbon) become hollow due to the outward convection (Cv<0). In contrast to the ion ITB plasma, in the L-mode plasma the impurity profiles are peaked (Cv>0), where the bulk ion density profile remains flat (Cv∼0). Understanding of the impurity behavior in the ion ITB plasma could lead to a self cleaning plasma reactor concept, with an efficient impurity exhaust.

KW - charge exchange spectroscopy

KW - helium exhaust

KW - impurity hole

KW - impurity transport

KW - LHD

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U2 - 10.1088/1741-4326/aa6c51

DO - 10.1088/1741-4326/aa6c51

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VL - 57

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

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