Measurement of deuterium and helium by glow-discharge optical emission spectroscopy for plasma–surface interaction studies

Hatano, Yuji; Shi, Jinjing; Yoshida, N.; Futagami, N.; Oya, Yasuhisa; Nakamura, Hirofumi

doi:10.1016/j.fusengdes.2012.02.078

Cited by 25 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The loading of the W coating with He was confirmed by GDOES measurements. It has been previously shown that good results regarding the amount of entrapped He in W could be achieved with this method . Figure shows the outcome for (I) the W coating prepared with 92% He (Figure c) and (II) a virgin Pc W substrate as a reference.…”

Section: Resultsmentioning

confidence: 91%

“…It has been previously shown that good results regarding the amount of entrapped He in W could be achieved with this method. 39 Figure 4 shows the outcome for (I) the W coating prepared with 92% He (Figure 2c) and (II) a virgin Pc W substrate as a reference. The plot shows the measured intensity of He's spectral line (587.5 nm) with respect to the time.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Morphological Changes of Tungsten Surfaces by Low-Flux Helium Plasma Treatment and Helium Incorporation via Magnetron Sputtering

Iyyakkunnel

Marot

Eren

et al. 2014

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The effect of helium on the tungsten microstructure was investigated first by exposure to a radio frequency driven helium plasma with fluxes of the order of 1 × 10(19) m(-2) s(-1) and second by helium incorporation via magnetron sputtering. Roughening of the surface and the creation of pinholes were observed when exposing poly- and nanocrystalline tungsten samples to low-flux plasma. A coating process using an excess of helium besides argon in the process gas mixture leads to a porous thin film and a granular surface structure whereas gas mixture ratios of up to 50% He/Ar (in terms of their partial pressures) lead to a dense structure. The presence of helium in the deposited film was confirmed with glow-discharge optical emission spectroscopy and thermal desorption measurements. Latter revealed that the highest fraction of the embedded helium atoms desorb at approximately 1500 K. Identical plasma treatments at various temperatures showed strongest modifications of the surface at 1500 K, which is attributed to the massive activation of helium singly bond to a single vacancy inside the film. Thus, an efficient way of preparing nanostructured tungsten surfaces and porous tungsten films at low fluxes was found.

show abstract

Section: Resultsmentioning

confidence: 91%

Section: ■ Results and Discussionmentioning

confidence: 99%

Morphological Changes of Tungsten Surfaces by Low-Flux Helium Plasma Treatment and Helium Incorporation via Magnetron Sputtering

Iyyakkunnel

Marot

Eren

et al. 2014

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…A single specimen was exposed to the plasma for a subset of the duration of the IPD experiments on December 3 rd and 6 th 2019 with the total boron quantity dropped during these experiments estimated at about 800 mg. Another material sample was inserted prior to a standard B2H6 boronization on LHD to provide a comparison. An analysis of the coatings on these samples was performed ex-situ using Glow Discharge Optical Emission Spectroscopy [45]. With this method an argon glow discharge is utilized to sputter micro-layers from the sample allowing a record of the composite depth profiles found upon these samples to be discerned.…”

Section: Long Pulse Discharges and Dust Assimilationmentioning

confidence: 99%

Real-time wall conditioning and recycling modification utilizing boron and boron nitride powder injections into the Large Helical Device

et al. 2022

View full text Add to dashboard Cite

Controlled particulate injections from the PPPL Impurity Powder Dropper(IPD) into the Large Helical Device (LHD) have demonstrated positive effects on the wall conditions in both an intra and inter-shot basis. Injections over a range of densities, input powers, pulse lengths, heating schemes, injection quantities and main ion species show conclusive evidence of improvement to plasma wall conditions. Successful injections are confirmed by both spectroscopic measurements as well as real-time visible camera signals. In 7s long plasmas the responses include a reduction in wall recycling as well as a reduction in native impurity content as observed over the course of several discharges. For plasmas longer than 40s, improvements to the recycling rate and increased impurity control are observed in real time as a consequence of the extended particulate injections. These experiments demonstrate the extended applicability of this solid particulate conditioning technique to the control and maintenance of the plasma wall conditions. In addition they are an important initial step in the development of the real time boronization technique as a supplement to standard conditioning scenarios.

show abstract

“…TDS measure D retention by detecting D signal during sample heating. In addition, glow-discharge optical emission spectroscopy (GD-OES) is also commonly used for D retention analysis [10][11][12][13][14]. In order to better use GD-OES to measure D retention in W, our previous work have developed the technique of GD-OES measuring D retention in W quantitatively by calibration of time-depth and voltageconcentration scale [14].…”

Section: Introductionmentioning

confidence: 99%

Comparing deuterium retention in heavy ion damaged tungsten measured by glow discharge optical emission spectroscopy, nuclear reaction analysis and thermal desorption spectroscopy

Zhang

Qiao

et al. 2021

Phys. Scr.

View full text Add to dashboard Cite

Hot-rolled tungsten specimen were irradiated with 5 MeV gold ion and loaded with deuterium plasma sequentially. Deuterium retention was examined by glow discharge optical emission spectroscopy, nuclear reaction analysis and thermal desorption spectroscopy. The deuterium depth profiles obtained by nuclear reaction analysis show that deuterium concentration increases significantly after irradiation, and damage region could uptake most of deuterium. The results of thermal desorption spectroscopy demonstrate that heavy ion damage can produce a large number of defects which could trap deuterium. Significant deuterium saturation was observed with damage level above 0.4 dpa. Furthermore, the depth profile and total inventory of deuterium show that the result measured by glow discharge optical emission spectroscopy is in good agreement with that by nuclear reaction analysis and thermal desorption spectroscopy.

show abstract

Measurement of deuterium and helium by glow-discharge optical emission spectroscopy for plasma–surface interaction studies

Cited by 25 publications

References 6 publications

Morphological Changes of Tungsten Surfaces by Low-Flux Helium Plasma Treatment and Helium Incorporation via Magnetron Sputtering

Morphological Changes of Tungsten Surfaces by Low-Flux Helium Plasma Treatment and Helium Incorporation via Magnetron Sputtering

Real-time wall conditioning and recycling modification utilizing boron and boron nitride powder injections into the Large Helical Device

Comparing deuterium retention in heavy ion damaged tungsten measured by glow discharge optical emission spectroscopy, nuclear reaction analysis and thermal desorption spectroscopy

Contact Info

Product

Resources

About