Determination of Hα emissivities from line integrated brightness measurements on Alcator C-Mod

C. Kurz; J. A. Snipes; J. L. Terry; B. Labombard; B. Lipschultz; G. M. McCracken

doi:10.1063/1.1146305

Determination of H_α emissivities from line integrated brightness measurements on Alcator C-Mod

C. Kurz
, J. A. Snipes
, J. L. Terry
, B. Labombard
, B. Lipschultz
, G. M. McCracken

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

11 Scopus citations

Abstract

Alcator C-Mod is equipped with a 227 chord visible light imaging system. Using a nonlinearly constrained least-squares algorithm, local emissivities have been obtained from the chordal brightness measurements without any assumptions about poloidal symmetry. The robustness of the inversion to noise and calibration errors as well as the spatial information (∼5-cm resolution) obtainable has been examined in detail. Some examples, demonstrating how results from the tomographic reconstruction of the H_α light can be used to calculate a particle confinement time and neutral density are given. Different interference filters in front of the arrays allow the same technique to be applied to other atomic species.

Original language	English (US)
Pages (from-to)	619-621
Number of pages	3
Journal	Review of Scientific Instruments
Volume	66
Issue number	1
DOIs	https://doi.org/10.1063/1.1146305
State	Published - 1995
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.1146305

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title = "Determination of Hα emissivities from line integrated brightness measurements on Alcator C-Mod",

abstract = "Alcator C-Mod is equipped with a 227 chord visible light imaging system. Using a nonlinearly constrained least-squares algorithm, local emissivities have been obtained from the chordal brightness measurements without any assumptions about poloidal symmetry. The robustness of the inversion to noise and calibration errors as well as the spatial information (∼5-cm resolution) obtainable has been examined in detail. Some examples, demonstrating how results from the tomographic reconstruction of the Hα light can be used to calculate a particle confinement time and neutral density are given. Different interference filters in front of the arrays allow the same technique to be applied to other atomic species.",

author = "C. Kurz and Snipes, \{J. A.\} and Terry, \{J. L.\} and B. Labombard and B. Lipschultz and McCracken, \{G. M.\}",

year = "1995",

doi = "10.1063/1.1146305",

language = "English (US)",

volume = "66",

pages = "619--621",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Determination of Hα emissivities from line integrated brightness measurements on Alcator C-Mod

AU - Kurz, C.

AU - Snipes, J. A.

AU - Terry, J. L.

AU - Labombard, B.

AU - Lipschultz, B.

AU - McCracken, G. M.

PY - 1995

Y1 - 1995

N2 - Alcator C-Mod is equipped with a 227 chord visible light imaging system. Using a nonlinearly constrained least-squares algorithm, local emissivities have been obtained from the chordal brightness measurements without any assumptions about poloidal symmetry. The robustness of the inversion to noise and calibration errors as well as the spatial information (∼5-cm resolution) obtainable has been examined in detail. Some examples, demonstrating how results from the tomographic reconstruction of the Hα light can be used to calculate a particle confinement time and neutral density are given. Different interference filters in front of the arrays allow the same technique to be applied to other atomic species.

AB - Alcator C-Mod is equipped with a 227 chord visible light imaging system. Using a nonlinearly constrained least-squares algorithm, local emissivities have been obtained from the chordal brightness measurements without any assumptions about poloidal symmetry. The robustness of the inversion to noise and calibration errors as well as the spatial information (∼5-cm resolution) obtainable has been examined in detail. Some examples, demonstrating how results from the tomographic reconstruction of the Hα light can be used to calculate a particle confinement time and neutral density are given. Different interference filters in front of the arrays allow the same technique to be applied to other atomic species.

UR - https://www.scopus.com/pages/publications/0005716029

UR - https://www.scopus.com/pages/publications/0005716029#tab=citedBy

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DO - 10.1063/1.1146305

M3 - Article

AN - SCOPUS:0005716029

SN - 0034-6748

VL - 66

SP - 619

EP - 621

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 1

ER -

Determination of H_α emissivities from line integrated brightness measurements on Alcator C-Mod

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