Tungsten spectra recorded at the LHD and comparison with calculations

Harte, Colm S.; Suzuki, C.; Katō, Takako; Sakaue, Hiroyuki; Kato, Daiji; Sato, K.; Tamura, N.; Sudo, S.; D’Arcy, Rebekah; Sokell, Emma; White, J.; O'Sullivan, Gerry

doi:10.1088/0953-4075/43/20/205004

Cited by 83 publications

(97 citation statements)

References 49 publications

(110 reference statements)

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“…It has been done especially in the range of EUV spectra from Nd, Gd [44,45], Sn [46,47] and W [48][49][50] and also the other heavy atoms. For example, spectra of highly charged Neodymium is studied with Neodymium tracer in the TESPEL having a diameter of 900 µm under the plasma condition with T e (0) = 2 keV andn e = 4×10 19 m −3 .…”

Section: Application To the Spectroscopymentioning

confidence: 99%

Plasma Diagnostics with Tracer-Encapsulated Solid Pellet

Sudo

Tamura

Muto

et al. 2014

Plasma and Fusion Research

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The diagnostics method of a tracer-encapsulated solid pellet (TESPEL) has been developed. TESPEL consists of polystyrene as an outer shell and of specific material as a tracer in the core. Owing to the advantages of the TESPEL, the following results have been successfully obtained: (1) distinctive different feature of impurity transport between the plateau and Pfirsch-Schlüter regimes depending on the impurity source location which is analyzed with the STRAHL code, (2) specific feature of a non-local thermal transport such as abrupt increase of electron temperature in the plasma core in case of plasma cooling in the plasma periphery due to a small TESPEL injection, (3) spatially resolved energy distribution of the high energy particles obtained by a pellet charge exchange method, (4) longer impurity containment inside the magnetic island which is observed by depositing the tracers in the magnetic island by means of the TESPEL, and (5) identification of new spectral lines using interested atoms contained in the core of the TESPEL.

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Section: Application To the Spectroscopymentioning

confidence: 99%

Plasma Diagnostics with Tracer-Encapsulated Solid Pellet

Sudo

Tamura

Muto

et al. 2014

Plasma and Fusion Research

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“…With the larger fusion plasma experiments also observations of emission from high Z elements will become important and this challenging development has already started both experimentally and theoretically, see Fig. 5 [38][39][40][41]. Now the question is posed, how can we meet the requirements of detection of e.g.…”

Section: New Developmentsmentioning

confidence: 99%

From X-rays to visible photons - What do we learn from the plasma observations?

Rachlew¹

2012

AIP Conference Proceedings

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Abstract. Photon spectroscopy from plasmas has proven to give new insights into the dynamics of the hot plasmas through multifaceted observations using absolute intensity and wavelength measurements. The spectroscopy observations have given a multitude of comparisons of theoretical modeling with experimental observations. Doppler, Zeeman and Stark effects have proven to be important ingredients in the observed spectra from the visible to the x-ray region.

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“…To further investigate the contribution of various transitions to the structure, we have carried out detailed calculations for open 4f tungsten ions by the Cowan code with a modification for numerous number of lines [9]. Consequently mean position and array widths of UTAs for 4d-4f, 4d-5p, 4f-5g and 4f-5d transitions are summarized graphically for all of the open 4f and 4d tungsten ions in Fig.…”

Section: Analysesmentioning

confidence: 99%

“…Tin and xenon have been investigated as candidate elements in the development of EUV light source for the next generation semiconductor lithography [3,4], and tungsten has been determined as a plasma facing component in the forthcoming International Thermonuclear Experimental Reactor (ITER) project [5]. We have measured EUV spectra from these elements in LHD so far [6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Measurement of EUV Spectra from High Z Elements in the Large Helical Device

Suzuki¹,

Katō²,

Sakaue³

et al. 2011

AIP Conference Proceedings

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Abstract. Extreme ultra-violet (EUV) emission spectra from highly charged tin, xenon and tungsten ions have been measured in optically thin high-temperature plasmas produced in the Large Helical Device (LHD) at the National Institute for Fusion Science by using a grazing incidence spectrometer and a tracer-encapsulated solid pellet (TESPEL) injector. Quasi-continuous spectral features arising from unresolved transition array (UTA) of open 4d subshell ions were commonly observed for tin, xenon and tungsten around 13.5, 11, and 5 nm, respectively, when edge plasma was cooled enough. The spectral appearance obviously depends on edge electron temperature and atomic number. In the case of intermediate edge temperature, sharp discrete lines from highly charged open 4s or 4p subshell ions are clearly observed for tin and xenon in longer wavelength side of the UTAs but not for tungsten. Assignments of the strong discrete lines have been performed with the help of comparisons with the other experimental data and the theoretical calculations by Cowan code. Contribution of open 4f subshell ions should also be considered to interpret the whole spectra from tungsten ions.

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Tungsten spectra recorded at the LHD and comparison with calculations

Abstract: Abstract:We have measured extreme ultraviolet (EUV)

Cited by 83 publications

References 49 publications

Plasma Diagnostics with Tracer-Encapsulated Solid Pellet

Plasma Diagnostics with Tracer-Encapsulated Solid Pellet

From X-rays to visible photons - What do we learn from the plasma observations?

Measurement of EUV Spectra from High Z Elements in the Large Helical Device

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