The effect of divertor tile material on radiation profiles in LHD

B. J. Peterson; S. Masuzaki; R. Sakamoto; K. Sato; S. Inagaki; A. Sagara; S. Ohdachi; Y. Nakamura; N. Noda; Y. Xu; J. E. Rice; N. Ashikawa; S. Yamamoto; M. Takechi; K. Toi; S. Morita; M. Goto; K. Narihara; N. Inoue; Y. Takeiri; M. Sato; M. Osakabe; K. Tanaka; T. Tokuzawa; S. Sakakibara; M. Shoji; K. Kawahata; O. Kaneko; N. Ohyabu; H. Yamada; A. Komori; K. Yamazaki; S. Sudo; O. Motojima

doi:10.1016/S0022-3115(00)00460-8

The effect of divertor tile material on radiation profiles in LHD

B. J. Peterson, S. Masuzaki, R. Sakamoto, K. Sato, S. Inagaki, A. Sagara, S. Ohdachi, Y. Nakamura, N. Noda, Y. Xu, J. E. Rice, N. Ashikawa, S. Yamamoto, M. Takechi, K. Toi, S. Morita, M. Goto, K. Narihara, N. Inoue, Y. TakeiriM. Sato, M. Osakabe, K. Tanaka, T. Tokuzawa, S. Sakakibara, M. Shoji, K. Kawahata, O. Kaneko, N. Ohyabu, H. Yamada, A. Komori, K. Yamazaki, S. Sudo, O. Motojima

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19 Citations (Scopus)

Abstract

In the large helical device (LHD) radiation profiles measured using arrays of resistive metal, foil bolometers are used to investigate the change in radiation resulting from a replacement of stainless steel divertor plates with graphite tiles between the second and third experimental campaigns. In particular, for the magnetic configuration of A_axis -3.6 m and at line averaged densities below 3 × 10¹⁹ m^-3, a reduction of the radiated power fraction from 35% in the second campaign to down to 12% in third campaign was observed. Comparing similar shots (in terms of discharge parameters) from the second and third cycles the core (0 < r/a. < 0.79) radiation fraction was reduced from 44% to 30% of the total radiation. Spectroscopic measurements show a corresponding decrease in radiation from iron. Comparing long pulse discharges the radiated power fraction reduced from greater than 67% during the density limiting oscillation observed in the second campaign to 20% during the third campaign with a reduction in the respective core radiation fractions from 63% to 37%.

Original language	English
Pages (from-to)	930-934
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	290-293
DOIs	https://doi.org/10.1016/S0022-3115(00)00460-8
Publication status	Published - Mar 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Materials Science(all)
Nuclear Energy and Engineering

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10.1016/S0022-3115(00)00460-8

Cite this

Peterson, B. J., Masuzaki, S., Sakamoto, R., Sato, K., Inagaki, S., Sagara, A., Ohdachi, S., Nakamura, Y., Noda, N., Xu, Y., Rice, J. E., Ashikawa, N., Yamamoto, S., Takechi, M., Toi, K., Morita, S., Goto, M., Narihara, K., Inoue, N., ... Motojima, O. (2001). The effect of divertor tile material on radiation profiles in LHD. Journal of Nuclear Materials, 290-293, 930-934. https://doi.org/10.1016/S0022-3115(00)00460-8

Peterson, BJ, Masuzaki, S, Sakamoto, R, Sato, K, Inagaki, S, Sagara, A, Ohdachi, S, Nakamura, Y, Noda, N, Xu, Y, Rice, JE, Ashikawa, N, Yamamoto, S, Takechi, M, Toi, K, Morita, S, Goto, M, Narihara, K, Inoue, N, Takeiri, Y, Sato, M, Osakabe, M, Tanaka, K, Tokuzawa, T, Sakakibara, S, Shoji, M, Kawahata, K, Kaneko, O, Ohyabu, N, Yamada, H, Komori, A, Yamazaki, K, Sudo, S & Motojima, O 2001, 'The effect of divertor tile material on radiation profiles in LHD', Journal of Nuclear Materials, vol. 290-293, pp. 930-934. https://doi.org/10.1016/S0022-3115(00)00460-8

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title = "The effect of divertor tile material on radiation profiles in LHD",

abstract = "In the large helical device (LHD) radiation profiles measured using arrays of resistive metal, foil bolometers are used to investigate the change in radiation resulting from a replacement of stainless steel divertor plates with graphite tiles between the second and third experimental campaigns. In particular, for the magnetic configuration of Aaxis -3.6 m and at line averaged densities below 3 × 1019 m-3, a reduction of the radiated power fraction from 35% in the second campaign to down to 12% in third campaign was observed. Comparing similar shots (in terms of discharge parameters) from the second and third cycles the core (0 < r/a. < 0.79) radiation fraction was reduced from 44% to 30% of the total radiation. Spectroscopic measurements show a corresponding decrease in radiation from iron. Comparing long pulse discharges the radiated power fraction reduced from greater than 67% during the density limiting oscillation observed in the second campaign to 20% during the third campaign with a reduction in the respective core radiation fractions from 63% to 37%.",

author = "Peterson, {B. J.} and S. Masuzaki and R. Sakamoto and K. Sato and S. Inagaki and A. Sagara and S. Ohdachi and Y. Nakamura and N. Noda and Y. Xu and Rice, {J. E.} and N. Ashikawa and S. Yamamoto and M. Takechi and K. Toi and S. Morita and M. Goto and K. Narihara and N. Inoue and Y. Takeiri and M. Sato and M. Osakabe and K. Tanaka and T. Tokuzawa and S. Sakakibara and M. Shoji and K. Kawahata and O. Kaneko and N. Ohyabu and H. Yamada and A. Komori and K. Yamazaki and S. Sudo and O. Motojima",

year = "2001",

month = mar,

doi = "10.1016/S0022-3115(00)00460-8",

language = "English",

volume = "290-293",

pages = "930--934",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

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T1 - The effect of divertor tile material on radiation profiles in LHD

AU - Peterson, B. J.

AU - Masuzaki, S.

AU - Sakamoto, R.

AU - Sato, K.

AU - Inagaki, S.

AU - Sagara, A.

AU - Ohdachi, S.

AU - Nakamura, Y.

AU - Noda, N.

AU - Xu, Y.

AU - Rice, J. E.

AU - Ashikawa, N.

AU - Yamamoto, S.

AU - Takechi, M.

AU - Toi, K.

AU - Morita, S.

AU - Goto, M.

AU - Narihara, K.

AU - Inoue, N.

AU - Takeiri, Y.

AU - Sato, M.

AU - Osakabe, M.

AU - Tanaka, K.

AU - Tokuzawa, T.

AU - Sakakibara, S.

AU - Shoji, M.

AU - Kawahata, K.

AU - Kaneko, O.

AU - Ohyabu, N.

AU - Yamada, H.

AU - Komori, A.

AU - Yamazaki, K.

AU - Sudo, S.

AU - Motojima, O.

PY - 2001/3

Y1 - 2001/3

N2 - In the large helical device (LHD) radiation profiles measured using arrays of resistive metal, foil bolometers are used to investigate the change in radiation resulting from a replacement of stainless steel divertor plates with graphite tiles between the second and third experimental campaigns. In particular, for the magnetic configuration of Aaxis -3.6 m and at line averaged densities below 3 × 1019 m-3, a reduction of the radiated power fraction from 35% in the second campaign to down to 12% in third campaign was observed. Comparing similar shots (in terms of discharge parameters) from the second and third cycles the core (0 < r/a. < 0.79) radiation fraction was reduced from 44% to 30% of the total radiation. Spectroscopic measurements show a corresponding decrease in radiation from iron. Comparing long pulse discharges the radiated power fraction reduced from greater than 67% during the density limiting oscillation observed in the second campaign to 20% during the third campaign with a reduction in the respective core radiation fractions from 63% to 37%.

AB - In the large helical device (LHD) radiation profiles measured using arrays of resistive metal, foil bolometers are used to investigate the change in radiation resulting from a replacement of stainless steel divertor plates with graphite tiles between the second and third experimental campaigns. In particular, for the magnetic configuration of Aaxis -3.6 m and at line averaged densities below 3 × 1019 m-3, a reduction of the radiated power fraction from 35% in the second campaign to down to 12% in third campaign was observed. Comparing similar shots (in terms of discharge parameters) from the second and third cycles the core (0 < r/a. < 0.79) radiation fraction was reduced from 44% to 30% of the total radiation. Spectroscopic measurements show a corresponding decrease in radiation from iron. Comparing long pulse discharges the radiated power fraction reduced from greater than 67% during the density limiting oscillation observed in the second campaign to 20% during the third campaign with a reduction in the respective core radiation fractions from 63% to 37%.

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JO - Journal of Nuclear Materials

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SN - 0022-3115

ER -

The effect of divertor tile material on radiation profiles in LHD

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