scholarly journals Absolute calibration of vacuum ultraviolet spectrograph system for plasma diagnostics

2004 ◽  
Vol 75 (10) ◽  
pp. 4088-4090 ◽  
Author(s):  
M. Yoshikawa ◽  
Y. Kubota ◽  
T. Kobayashi ◽  
M. Saito ◽  
N. Numada ◽  
...  
Keyword(s):  
Plasma Diagnostics ◽  
Vacuum Ultraviolet ◽  
Absolute Calibration

Absolute Calibration of Space- and Time-Resolving Flat-Field Vacuum Ultraviolet Spectrograph for Plasma Diagnostics

2000 ◽  
Vol 39 (Part 1, No. 6A) ◽  
pp. 3609-3613 ◽  
Author(s):  
Yuuji Okamoto ◽  
Masayuki Yoshikawa ◽  
Naohiro Yamaguchi ◽  
Chikara Watabe ◽  
Teruo Tamano ◽  
...  
Keyword(s):  
Plasma Diagnostics ◽  
Vacuum Ultraviolet ◽  
Absolute Calibration ◽  
Space And Time ◽  
Flat Field

SPACE-RESOLVING VUV AND SOFT X-RAY SPECTROSCOPY IN THE TANDEM MIRROR GAMMA 10 PLASMA

2002 ◽  
Vol 09 (01) ◽  
pp. 555-559 ◽  
Author(s):  
M. YOSHIKAWA ◽  
Y. OKAMOTO ◽  
E. KAWAMORI ◽  
Y. WATANABE ◽  
C. WATABE ◽  
...  
Keyword(s):  
Vacuum Ultraviolet ◽  
Radiation Power ◽  
Emission Spectra ◽  
High Energy ◽  
Absolute Calibration ◽  
Fusion Plasmas ◽  
X Ray ◽  
Confined Plasmas ◽  
Tandem Mirror ◽  
Impurity Ions

Vacuum ultraviolet (VUV) and soft X-ray (SX) spectroscopic measurements are important means to diagnose radiation power loss, impurity ion densities and effective charge of confined plasma, Z eff , in magnetically confined plasmas such as fusion plasmas. We have constructed space- and time-resolving flat-field VUV (150–1050Å) and SX (20–350Å) spectrographs by using aberration-corrected concave gratings with varied line spacing. Absolute calibration experiments have been conducted at the Photon Factory in the High Energy Accelerator Research Organization. Absolute sensitivities of the VUV and SX spectrographs have been obtained for the two (S and P) polarization geometries. Thus, absolute intensities of emission spectra from impurity ions can be measured together with their radial distributions in plasmas. The total radiation power was determined to be less than 6 kW within ±20% of error in our normal plasma operation. Density profiles of impurity ions were reduced by using absolute emissivities of impurity lines and a collisional-radiative model. Moreover, the value of Z eff is estimated to be 1.00 in the tandem mirror GAMMA 10 plasma.

scholarly journals Atlas of new and revised high-resolution spectroscopy of six CO isotopologues in the 101–115 nm range

2018 ◽  
Vol 614 ◽  
pp. A114 ◽  
Author(s):  
J. L. Lemaire ◽  
A. N. Heays ◽  
M. Eidelsberg ◽  
L. Gavilan ◽  
G. Stark ◽  
...  
Keyword(s):  
Vacuum Ultraviolet ◽  
Molecular Spectroscopy ◽  
Great Majority ◽  
Molecular Data ◽  
Resolving Power ◽  
High Resolution Spectroscopy ◽  
Absolute Calibration ◽  
Molecular Constants ◽  
Line Positions ◽  
Nm Range

Our knowledge of astronomical environments containing CO depends on accurate molecular data to reproduce and interpret observed spectra. The recent and future improvements of ultraviolet space instrumentation, both in sensitivity and resolution, require increasingly detailed laboratory molecular spectroscopy as a reference. As part of a long-term experimental campaign at the SOLEIL Synchrotron facility, we have acquired gas-phase absorption spectra of six CO isotopologues in the vacuum ultraviolet. These spectra are recorded using the Fourier-transform spectrometer installed on the DESIRS beamline, providing a unique resolving power up to 106 in the 8–13 eV range. We have used resolutions in the 300 000–450 000 range for this campaign, which enable the analysis of individual line positions. We report new measurements on neighboring Rydberg states in the 101–115 nm range that could also be used as f-value calibrators, namely B1Σ+, C1Σ+, and E1Π, for six CO isotopologues. This range encompasses the absorption transitions B(v′ = 0, 1, and 2), C(v′ = 0, 1, 2, and 3), and E(v′ = 0, 1, 2, and 3) from X1Σ+(v′′ = 0). Higher resolution laser-based measurements of CO isotopologues from the literature are used to improve the absolute calibration and accuracy of our data. The overall uncertainty of the great majority of the line positions presented in this atlas is estimated to be 0.01 cm−1. In addition, some of the data derived from transition energies measurements, such as term values and molecular constants, are obtained for the first time, and others are improvements on previous sparser or lower spectral resolution datasets.

Calibration of Time- and Space-Resolving Vacuum Ultraviolet Spectrograph for Plasma Diagnostics in the Tandem Mirror GAMMA 10

1999 ◽  
Vol 38 (Part 1, No. 4A) ◽  
pp. 2137-2140
Author(s):  
Masayuki Yoshikawa ◽  
Katsunori Ikeda ◽  
Yuuji Okamoto ◽  
Eiichiro Kawamori ◽  
Takahiro Ito ◽  
...  
Keyword(s):  
Plasma Diagnostics ◽  
Vacuum Ultraviolet ◽  
Time And Space ◽  
Tandem Mirror

Space‐resolving flat‐field vacuum ultraviolet spectrograph for plasma diagnostics

1994 ◽  
Vol 65 (11) ◽  
pp. 3408-3414 ◽  
Author(s):  
Naohiro Yamaguchi ◽  
Jungo Katoh ◽  
Yukiko Sato ◽  
Tatsuya Aota ◽  
Atsusi Mase ◽  
...  
Keyword(s):  
Plasma Diagnostics ◽  
Vacuum Ultraviolet ◽  
Flat Field
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