title: Spectroscopic imaging of limiter heat and particle fluxes and the resulting impurity sources during Wendelstein 7-X startup plasmas.
abstract: A combined IR and visible camera system [G. A. Wurden et al., "A high resolution IR/visible imaging system for the W7-X limiter," Rev. Sci. Instrum. (these proceedings)] and a filterscope system [R. J. Colchin et al., Rev. Sci. Instrum. 74, 2068 (2003)] were implemented together to obtain spectroscopic data of limiter and first wall recycling and impurity sources during Wendelstein 7-X startup plasmas. Both systems together provided excellent temporal and spatial spectroscopic resolution of limiter 3. Narrowband interference filters in front of the camera yielded C-III and Hαphoton flux, and the filterscope system provided Hα, Hβ, He-I, He-II, C-II, and visible bremsstrahlung data. The filterscopes made additional measurements of several points on the W7-X vacuum vessel to yield wall recycling fluxes. The resulting photon flux from both the visible camera and filterscopes can then be compared to an EMC3-EIRENE synthetic diagnostic [H. Frerichs et al., "Synthetic plasma edge diagnostics for EMC3-EIRENE, highlighted for Wendelstein 7-X," Rev. Sci. Instrum. (these proceedings)] to infer both a limiter particle flux and wall particle flux, both of which will ultimately be used to infer the complete particle balance and particle confinement time τP.
authors.affiliation: University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: L
authors.initials: L
authors.lastname: Stephey
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: G A
authors.initials: GA
authors.lastname: Wurden
authors.affiliation: University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: O
authors.initials: O
authors.lastname: Schmitz
authors.affiliation: University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: H
authors.initials: H
authors.lastname: Frerichs
authors.affiliation: University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: F
authors.initials: F
authors.lastname: Effenberg
authors.affiliation: Max-Planck-Institut für Plasma Physik, Wendelsteinstrasse 1, 17491 Greifswald, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Biedermann
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: J
authors.initials: J
authors.lastname: Harris
authors.affiliation: Max-Planck-Institut für Plasma Physik, Wendelsteinstrasse 1, 17491 Greifswald, Germany.
authors.forename: R
authors.initials: R
authors.lastname: König
authors.affiliation: Max-Planck-Institut für Plasma Physik, Wendelsteinstrasse 1, 17491 Greifswald, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Kornejew
authors.affiliation: Max-Planck-Institut für Plasma Physik, Wendelsteinstrasse 1, 17491 Greifswald, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Krychowiak
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: E A
authors.initials: EA
authors.lastname: Unterberg
authors.affiliation: Max-Planck-Institut für Plasma Physik, Wendelsteinstrasse 1, 17491 Greifswald, Germany.