Responsivity calibration of the LoWEUS spectrometer

Journal Article · Tue Nov 15 04:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4960729· OSTI ID:22596393

Beiersdorfer, P. ^[1]; Kaita, R.; Majeski, R.; Boyle, D. ^[2]

---

1. Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

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.

• OSTI ID: 22596393
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 87; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CALIBRATION
CHARGE STATES
COMPARATIVE EVALUATIONS
EXTREME ULTRAVIOLET RADIATION
LITHIUM
OXYGEN
PLASMA
POLYNOMIALS
TOKAMAK DEVICES
ULTRAVIOLET SPECTROMETERS
WAVELENGTHS