Responsivity calibration of the LoWEUS spectrometer

We performed an in situ calibration of the relative responsivity function of the Long-Wavelength Extreme Ultraviolet Spectrometer (LoWEUS), while operating on the Lithium Tokamak Experiment (LTX) at Princeton Plasma Physics Laboratory. The calibration was accomplished by measuring oxygen lines, whic...

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Bibliographic Details
Published in:Review of scientific instruments 2016-11, Vol.87 (11), p.11D614-11D614
Main Authors: Lepson, J. K., Beiersdorfer, P., Kaita, R., Majeski, R., Boyle, D.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION
ATOMIC AND MOLECULAR PHYSICS
Calibration
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Normalizing
Plasma physics
Plasmas (physics)
Predictions
Scientific apparatus & instruments
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Summary:We performed an in situ calibration of the relative responsivity function of the Long-Wavelength Extreme Ultraviolet Spectrometer (LoWEUS), while operating on the Lithium Tokamak Experiment (LTX) at Princeton Plasma Physics Laboratory. The calibration was accomplished by measuring oxygen lines, which are typically present in LTX plasmas. The measured spectral line intensities of each oxygen charge state were then compared to the calculated emission strengths given in the CHIANTI atomic database. Normalizing the strongest line in each charge state to the CHIANTI predictions, we obtained the differences between the measured and predicted values for the relative strengths of the other lines of a given charge state. We find that a 3rd degree polynomial function provides a good fit to the data points. Our measurements show that the responsivity between about 120 and 300 Å varies by factor of ∼30.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4960729