Emission rates of CH/CD and C spectral bands for hydrocarbon-loss-events measured in JT-60U divertor plasmas

Nakano, Tomohide; Tsuzuki, Kazuhiro; Higashijima, Satoru; Kubo, Hirotaka; Asakura, Nobuyuki

Europhysics Conference Abstracts (CD-ROM), 29C, 4 Pages, 2005/00

http://epsppd.epfl.ch/Tarragona/pdf/P5_007.pdf

Emission rates of CH and C spectral bands for CH, CD_2 loss events due to dissociation, ionization and transport were measured in JT-60U divertor plasmas. The obtained data were used for estimating the chemical sputtering yields by a spectroscopic technique. The CH loss events over one CH photon emission was about 200 at electron temperatures between 30 eV and 70 eV. These values fell within the confidential band of the CD one. The CH loss events over one CH and one C photon emission were, respectively, between 200 - 300 and between 600 - 1800, and their ratio between 3 - 6. On the assumption that only CH among hydrocarbons generated by chemical sputtering emits the C spectral bands, the intensity of the CH spectral bands originating from CH is inferred from the intensity of C spectral bands multiplied by the obtained ratio, resulting in higher than the measured CH intensity. This result indicates that dominant hydrocarbons generated by the chemical sputtering is not CH but CH.

Hydrocarbons in divertor plasmas; What can be understood from spectroscopy

Nakano, Tomohide; Kado, Shinichiro*

Purazuma, Kaku Yugo Gakkai-Shi, 80(2), p.91 - 100, 2004/02

http://ci.nii.ac.jp/naid/110003827674

Descriptions on the band structure of the system of a CH radical, the method of hydrocarbon flux measurement and the modeling of hydrocarbon elementary processes are given. Then, the reviews of recent research achievements are presented. At JT-60U divertor plates, the chemical sputtering yields of not only but also have been measured with simultaneous measurement of CH and bands. In MAP-II of the University of Tokyo, hydrocarbon-enhanced molecular assisted recombination processes have been qualitatively proved by comparison of the measured and the modeled CH band intensity.

Atomic and molecular processes for heat and particle control in tokamaks

Kubo, Hirotaka

AIP Conference Proceedings 636, p.161 - 170, 2002/00

https://doi.org/10.1063/1.1516333

no abstracts in English

Single-, double- and triple-electron capture cross sections for multicharged slow carbon ions in H,CH,CH,CH and CO molecules

Ito, Akio*; Imanishi, Nobutsugu*; *; Hamamoto, Nariaki*; *; Tanaka, Takashi*; *; Saito, Manabu*; Haruyama, Yoichi*; Shirai, Toshizo

Journal of the Physical Society of Japan, 64(9), p.3255 - 3264, 1995/09

https://doi.org/10.1143/JPSJ.64.3255

no abstracts in English

Enhancement of CH formation due to interaction of graphite with energetic protons

Journal of Nuclear Materials, 174, p.118 - 120, 1990/00

https://doi.org/10.1016/0022-3115(90)90429-Q

no abstracts in English

Estimation of C and C hydrocarbon production yields of graphite due to hydrogen ion bombardment

*

J.Vac.Sci.Technol.,A, 5(3), p.305 - 307, 1987/03

no abstracts in English

The -ray-induced reactions of carbon monoxide-hydrogen mixtures at elevated pressures

Int.J.Appl.Radiat.Isot., 34(3), p.559 - 564, 1983/00

https://doi.org/10.1016/0020-708X(83)90056-X

no abstracts in English

The Dependence of self-focusing of a high-intensity pulsed electron beam on gaseous media as studied by depth-dose distributions, 3; Hydrocarbons and halogenomethanes

; Hotta, Hiroshi

Radiat.Res., 64(3), p.407 - 415, 1975/03

https://doi.org/10.2307/3574231

no abstracts in English