To optimize the design of ITER vacuum ultraviolet (VUV) spectrometer, a prototype VUV spectrometer was developed. The sensitivity calibration curve of the spectrometer was calculated from the mirror reflectivity, the grating efficiency, and the detector efficiency. The calibration curve was consistent with the calibration points derived in the experiment using the calibrated hollow cathode lamp. For the application of the prototype ITER VUV spectrometer, the prototype spectrometer was installed at KSTAR, and various impurity emission lines could be measured. By analyzing about 100 shots, strong positive correlation between the O VI and the C IV emission intensities could be found.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1063/1.4886430 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The thorium isomer Th: review of status and perspectives after more than 50 years of research.
Eur Phys J Spec Top
January 2024
Faculty of Physics, Ludwig-Maximilians-Universität München, Am Coulombwall 1, Garching, 85748 Germany.
Article Synopsis
- Today's precise timekeeping relies on optical atomic clocks, but nuclear clocks, using nuclear transitions, could offer enhanced accuracy for various scientific applications.
- The elusive "Thorium Isomer" (Th) is a potential candidate for a nuclear clock, which has been under investigation for decades but only recently confirmed through direct detection in 2016.
- Significant advances in characterizing Th's properties have been made, including determining its half-life and excitation energy, culminating in the first observation of its radiative decay, paving the way for further developments in precise timekeeping.
Effects of isoprene on the ozonolysis of Δ-carene and β-caryophyllene: Mechanisms of secondary organic aerosol formation and cross-dimerization.
J Environ Sci (China)
April 2025
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; Hefei National Laboratory, Hefei 230088, China. Electronic address:
Elucidating the mutual effects between the different volatile organic compounds (VOCs) is crucial for comprehending the formation mechanism of atmospheric secondary organic aerosols (SOA). Here, the mixed VOCs experiments of isoprene and Δ-carene/β-caryophyllene were carried out in the presence of O using an indoor smog chamber. The suppression effect of isoprene was recognized by the scanning mobility particle sizer spectrometer, online vacuum ultraviolet free electron laser (VUV-FEL) photoionization aerosol mass spectrometry, and quantum chemical calculations.
View Article and Find Full Text PDFExploring photoionization of gas-phase free radicals with a widely tunable VUV laser at moderate spectral resolution.
Rev Sci Instrum
September 2024
Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France.
The VUv Laser for Considering Astrophysical and Isolated Molecules (VULCAIMs) setup [Harper et al., Phys. Chem.
View Article and Find Full Text PDFA dopant-assisted iodide-adduct chemical ionization time-of-flight mass spectrometer based on VUV lamp photoionization for atmospheric low-molecular-weight organic acids analysis.
J Environ Sci (China)
March 2025
Environment Research Institute, Shandong University, Qingdao 266237, China. Electronic address:
Formic and acetic acids are the most abundant gaseous organic acids and play the key role in the atmospheric chemistry. In iodine-adduct chemical ionization mass spectrometry (CIMS), the low utilization efficiency of methyl iodide and humidity interference are two major issues of the vacuum ultraviolet (VUV) lamp initiated CIMS for on-line gaseous formic and acetic acids analysis. In this work, we present a new CIMS based on VUV lamp, and the ion-molecular reactor is separated into photoionization and chemical ionization zones by a reducer electrode.
View Article and Find Full Text PDFReflectivity measurement of a silicon carbide mirror sample for ITER divertor vacuum ultraviolet spectrometer.
Rev Sci Instrum
August 2024
Department of Energy Systems Research, Ajou University, 206 Worldcup-ro, Suwon 16499, South Korea.
Article Synopsis
- The first mirror in fusion plasmas reflects light to the diagnostic system and is made from silicon carbide (SiC) for its strength and radiation resistance.
- A device was developed to measure the reflectivity of the SiC mirror at specific angles using a hollow cathode lamp and a dedicated VUV spectrometer.
- Experimental results showed that the reflectivity values of SiC were influenced by both the oxidation layer on the surface and the incidence angle of the VUV light.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!