Measurement of the 2D emission profiles of hydrogen and impurity ions in the TCV divertor

EUROfusion MST1 Team; TCV team; A. Perek; T. A. Wijkamp; M. R. de Baar

doi:10.1016/j.nme.2020.100858

Measurement of the 2D emission profiles of hydrogen and impurity ions in the TCV divertor

EUROfusion MST1 Team, TCV team, A. Perek (Corresponding author), T. A. Wijkamp, M. R. de Baar

Research output: Contribution to journal › Article › Academic › peer-review

14 Citations (Scopus)

Abstract

Plasma emission of hydrogen and impurities is measured with use of filtered camera imaging in TCV divertor. The measurement technique is discussed in detail including: selection choice of filters, the absolute calibration procedure and the tomographic inversion. The process is applied to an unseeded L-mode density ramp discharge in an unfavorable for H-mode access magnetic field direction with divertor baffles. Obtained poloidal emission profiles are used to split Balmer emission into excitation and recombination parts revealing a recombination emission maximum on the high field side. The optical emission is further studied by selecting radial profiles in cross sections of interest finding an opposite radial shift direction for high and low n Balmer line emission maxima in detached conditions.

Original language	English
Article number	100858
Number of pages	7
Journal	Nuclear Materials and Energy
Volume	26
DOIs	https://doi.org/10.1016/j.nme.2020.100858
Publication status	Published - Mar 2021

Keywords

2D spectroscopy
Detachment
Quantitative imaging
Tomographic inversion

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10.1016/j.nme.2020.100858

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title = "Measurement of the 2D emission profiles of hydrogen and impurity ions in the TCV divertor",

abstract = "Plasma emission of hydrogen and impurities is measured with use of filtered camera imaging in TCV divertor. The measurement technique is discussed in detail including: selection choice of filters, the absolute calibration procedure and the tomographic inversion. The process is applied to an unseeded L-mode density ramp discharge in an unfavorable for H-mode access magnetic field direction with divertor baffles. Obtained poloidal emission profiles are used to split Balmer emission into excitation and recombination parts revealing a recombination emission maximum on the high field side. The optical emission is further studied by selecting radial profiles in cross sections of interest finding an opposite radial shift direction for high and low n Balmer line emission maxima in detached conditions.",

keywords = "2D spectroscopy, Detachment, Quantitative imaging, Tomographic inversion",

author = "{EUROfusion MST1 Team} and {TCV team} and A. Perek and Linehan, {B. L.} and M. Wensing and K. Verhaegh and Classen, {I. G.J.} and Duval, {B. P.} and O. F{\'e}vrier and H. Reimerdes and C. Theiler and Wijkamp, {T. A.} and {de Baar}, {M. R.}",

year = "2021",

month = mar,

doi = "10.1016/j.nme.2020.100858",

language = "English",

volume = "26",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier",

}

TY - JOUR

T1 - Measurement of the 2D emission profiles of hydrogen and impurity ions in the TCV divertor

AU - EUROfusion MST1 Team

AU - TCV team

AU - Perek, A.

AU - Linehan, B. L.

AU - Wensing, M.

AU - Verhaegh, K.

AU - Classen, I. G.J.

AU - Duval, B. P.

AU - Février, O.

AU - Reimerdes, H.

AU - Theiler, C.

AU - Wijkamp, T. A.

AU - de Baar, M. R.

PY - 2021/3

Y1 - 2021/3

N2 - Plasma emission of hydrogen and impurities is measured with use of filtered camera imaging in TCV divertor. The measurement technique is discussed in detail including: selection choice of filters, the absolute calibration procedure and the tomographic inversion. The process is applied to an unseeded L-mode density ramp discharge in an unfavorable for H-mode access magnetic field direction with divertor baffles. Obtained poloidal emission profiles are used to split Balmer emission into excitation and recombination parts revealing a recombination emission maximum on the high field side. The optical emission is further studied by selecting radial profiles in cross sections of interest finding an opposite radial shift direction for high and low n Balmer line emission maxima in detached conditions.

AB - Plasma emission of hydrogen and impurities is measured with use of filtered camera imaging in TCV divertor. The measurement technique is discussed in detail including: selection choice of filters, the absolute calibration procedure and the tomographic inversion. The process is applied to an unseeded L-mode density ramp discharge in an unfavorable for H-mode access magnetic field direction with divertor baffles. Obtained poloidal emission profiles are used to split Balmer emission into excitation and recombination parts revealing a recombination emission maximum on the high field side. The optical emission is further studied by selecting radial profiles in cross sections of interest finding an opposite radial shift direction for high and low n Balmer line emission maxima in detached conditions.

KW - 2D spectroscopy

KW - Detachment

KW - Quantitative imaging

KW - Tomographic inversion

UR - http://www.scopus.com/inward/record.url?scp=85098475087&partnerID=8YFLogxK

U2 - 10.1016/j.nme.2020.100858

DO - 10.1016/j.nme.2020.100858

M3 - Article

AN - SCOPUS:85098475087

SN - 2352-1791

VL - 26

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 100858

ER -

Measurement of the 2D emission profiles of hydrogen and impurity ions in the TCV divertor

Abstract

Keywords

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