Dust particle formation due to interaction between graphite and helicon deuterium plasmas

Iwashita, Shinya; Nishiyama, Kanako; Seo, Hyunwoong; Itagaki, Naho; Koga, Kazunori; Shiratani, Masaharu

doi:10.1016/j.fusengdes.2012.10.002

Cited by 10 publications

(9 citation statements)

References 26 publications

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“…Similar structures were formed previously in linear plasma simulator experiments, 42,43 using high-pressure inductively coupled plasmas, 44 helicon-wave excited discharge, 45,63 and even in the tokamak environment. 46,47 Furthermore, analogous structures were observed in PECVD processing, for instance, during early stages of ultrananocrystalline diamond growth 48,49 or during growth of carbon nanowalls.…”

Section: B Location and Structure Of The Redepositssupporting

confidence: 78%

Reorganization of graphite surfaces into carbon micro- and nanoparticles under high flux hydrogen plasma bombardment

Bystrov

Vegt

Temmerman

et al. 2012

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Fine-grain graphite samples were exposed to high density low temperature (ne∼1020 m−3, Te∼1 eV) hydrogen plasmas in the Pilot-PSI linear plasma generator. Redeposition of eroded carbon is so strong that no external precursor gas injection is necessary for deposits to form on the exposed surface during the bombardment. In fact, up to 90% of carbon is redeposited, most noticeably in the region of the highest particle flux. The redeposits appear in the form of carbon microparticles of various sizes and structures. Discharge parameters influence the efficiency of the redeposition processes and the particle growth rate. Under favorable conditions, the growth rate reaches 0.15 μm/s. The authors used high resolution scanning electron microscopy and transmission electron microscopy to study the particle growth mode. The columnar structure of some of the large particles points toward surface growth, while observation of the spherical carbon nanoparticles indicates growth in the plasma phase. Multiple nanoparticles can agglomerate and form bigger particles. The spherical shape of the agglomerates suggests that nanoparticles coalesce in the gas phase. The erosion and redeposition patterns on the samples are likely determined by the gradients in plasma flux density and surface temperature across the surface.

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Section: B Location and Structure Of The Redepositssupporting

confidence: 78%

Reorganization of graphite surfaces into carbon micro- and nanoparticles under high flux hydrogen plasma bombardment

Bystrov

Vegt

Temmerman

et al. 2012

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

View full text Add to dashboard Cite

show abstract

“…Nanoparticles deposited on the electrodes were collected by the filtered vacuum collection method, which has been widely employed for dust particle collection in nuclear fusion reactors [33][34][35][36]. For the method, a polycarbonate membrane filter (ADVANTEC K010A) with many holes of 100 nm in diameter was put into a filter holder.…”

Section: Methodsmentioning

confidence: 99%

Formation of carbon nanoparticle using Ar+CH₄high pressure nanosecond discharges

Koga

Dong

Iwashita

et al. 2014

J. Phys.: Conf. Ser.

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“…The divertor simulator can simulate carbon dust formation in the divertor region of LHD [7][8][9][10][11]. We are developing a dust monitoring method using quartz crystal microbalances (QCMs) equipped with a dust eliminating filter [12].…”

Section: Introductionmentioning

confidence: 99%

Real-time mass measurement of dust particles deposited on vessel wall in a divertor simulator using quartz crystal microbalances

Tateishi

Koga

Katayama

et al. 2015

Journal of Nuclear Materials

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Dust particle formation due to interaction between graphite and helicon deuterium plasmas

Cited by 10 publications

References 26 publications

Reorganization of graphite surfaces into carbon micro- and nanoparticles under high flux hydrogen plasma bombardment

Reorganization of graphite surfaces into carbon micro- and nanoparticles under high flux hydrogen plasma bombardment

Formation of carbon nanoparticle using Ar+CH₄high pressure nanosecond discharges

Real-time mass measurement of dust particles deposited on vessel wall in a divertor simulator using quartz crystal microbalances

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Dust particle formation due to interaction between graphite and helicon deuterium plasmas

Cited by 10 publications

References 26 publications

Reorganization of graphite surfaces into carbon micro- and nanoparticles under high flux hydrogen plasma bombardment

Reorganization of graphite surfaces into carbon micro- and nanoparticles under high flux hydrogen plasma bombardment

Formation of carbon nanoparticle using Ar+CH4high pressure nanosecond discharges

Real-time mass measurement of dust particles deposited on vessel wall in a divertor simulator using quartz crystal microbalances

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Formation of carbon nanoparticle using Ar+CH₄high pressure nanosecond discharges