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Journal Articles

Effect of neutron and γ -ray on charge-coupled device for vacuum/extreme ultraviolet spectroscopy in deuterium discharges of large helical device

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Y. Liu, S. Morita, T. Oishi, M. Goto
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 89, 10I109 (2018)
https://doi.org/10.1063/1.5037233
Published: September 2018
View articletitled, Effect of neutron and γ -ray on charge-coupled device for vacuum/extreme ultraviolet spectroscopy in deuterium discharges of large helical device
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Journal Articles

Space-resolved visible spectroscopy for two-dimensional measurement of hydrogen and impurity emission spectra and of plasma flow in the edge stochastic layer of LHD

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M. Kobayashi, S. Morita, M. Goto
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 88, 033501 (2017)
https://doi.org/10.1063/1.4976963
Published: March 2017
View articletitled, Space-resolved visible spectroscopy for two-dimensional measurement of hydrogen and impurity emission spectra and of plasma flow in the edge stochastic layer of LHD
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Journal Articles

Up-down asymmetry measurement of tungsten distribution in large helical device using two extreme ultraviolet (EUV) spectrometers

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Y. Liu, S. Morita, X. L. Huang, T. Oishi, M. Goto, H. M. Zhang
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 87, 11E308 (2016)
https://doi.org/10.1063/1.4959781
Published: August 2016
View articletitled, Up-down asymmetry measurement of tungsten distribution in large helical device using two extreme ultraviolet (EUV) spectrometers
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Journal Articles

Note: On the wavelength dependence of the intensity calibration factor of extreme ultraviolet spectrometer determined with profile measurement of bremsstrahlung continuum

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N. Yamaguchi, S. Morita, C. F. Dong, M. Goto, H. Maezawa, H. Miyauchi
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 86, 066105 (2015)
https://doi.org/10.1063/1.4922532
Published: June 2015
View articletitled, Note: On the wavelength dependence of the intensity calibration factor of extreme ultraviolet spectrometer determined with profile measurement of bremsstrahlung continuum
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Journal Articles

Coaxial pellets for metallic impurity injection on the large helical device

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X. L. Huang, S. Morita, T. Oishi, M. Goto, H. M. Zhang
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 85, 11E818 (2014)
https://doi.org/10.1063/1.4892440
Published: August 2014
View articletitled, Coaxial pellets for metallic impurity injection on the large helical device
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Journal Articles

Tomographic inversion techniques incorporating physical constraints for line integrated spectroscopy in stellarators and tokamaks

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N. A. Pablant, R. E. Bell, M. Bitter, L. Delgado-Aparicio, K. W. Hill, S. Lazerson, S. Morita
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 85, 11E424 (2014)
https://doi.org/10.1063/1.4891977
Published: August 2014
View articletitled, Tomographic inversion techniques incorporating physical constraints for line integrated spectroscopy in stellarators and tokamaks
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Journal Articles

Quasilinear carbon transport in an impurity hole plasma in LHD

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D. R. Mikkelsen, K. Tanaka, M. Nunami, T.-H. Watanabe, H. Sugama, M. Yoshinuma, K. Ida, Y. Suzuki, M. Goto, S. Morita, B. Wieland, I. Yamada, R. Yasuhara, T. Tokuzawa, T. Akiyama, N. A. Pablant
Journal: Physics of Plasmas
Phys. Plasmas 21, 082302 (2014)
https://doi.org/10.1063/1.4890973
Published: August 2014
View articletitled, Quasilinear carbon transport in an impurity hole plasma in LHD
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Journal Articles

Line spectrum and ion temperature measurements from tungsten ions at low ionization stages in large helical device based on vacuum ultraviolet spectroscopy in wavelength range of 500–2200 Å

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T. Oishi, S. Morita, X. L. Huang, H. M. Zhang, M. Goto
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 85, 11E415 (2014)
https://doi.org/10.1063/1.4885470
Published: August 2014
View articletitled, Line spectrum and ion temperature measurements from tungsten ions at low ionization stages in large helical device based on vacuum ultraviolet spectroscopy in wavelength range of 500–2200 Å
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Journal Articles

Development of a high dynamic range spectroscopic system for observation of neutral hydrogen atom density distribution in Large Helical Device core plasma

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K. Fujii, S. Atsumi, S. Watanabe, T. Shikama, M. Goto, S. Morita, M. Hasuo
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 85, 023502 (2014)
https://doi.org/10.1063/1.4863650
Published: February 2014
View articletitled, Development of a high dynamic range spectroscopic system for observation of neutral hydrogen atom density distribution in Large Helical Device core plasma
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Journal Articles

Superfluid helium cryogenic systems for superconducting RF cavities at KEK

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H. Nakai, K. Hara, T. Honma, K. Hosoyama, Y. Kojima, K. Nakanishi, T. Kanekiyo, S. Morita
Journal: AIP Conference Proceedings
AIP Conf. Proc. 1573, 1349–1356 (2014)
https://doi.org/10.1063/1.4860863
Published: January 2014
View articletitled, Superfluid helium cryogenic systems for superconducting RF cavities at KEK
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Journal Articles

A study of tungsten spectra using large helical device and compact electron beam ion trap in NIFS

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S. Morita, C. F. Dong, M. Goto, D. Kato, I. Murakami, H. A. Sakaue, M. Hasuo, F. Koike, N. Nakamura, T. Oishi, A. Sasaki, E. H. Wang
Journal: AIP Conference Proceedings
AIP Conf. Proc. 1545, 143–152 (2013)
https://doi.org/10.1063/1.4815848
Published: July 2013
View articletitled, A study of tungsten spectra using large helical device and compact electron beam ion trap in NIFS
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Journal Articles

Data of heavy elements for light sources in EUV and XUV and for other applications

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F. Koike, H. Funaba, M. Goto, D. Kato, T. Kato, S. Morita, I. Murakami, H. A. Sakaue, S. Sudo, C. Suzuki, N. Tanuma, A. Sasaki, X. B. Ding
Journal: AIP Conference Proceedings
AIP Conf. Proc. 1545, 202–211 (2013)
https://doi.org/10.1063/1.4815855
Published: July 2013
View articletitled, Data of heavy elements for light sources in EUV and XUV and for other applications
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Journal Articles

Hydrogen transport diagnostics by atomic and molecular emission line profiles simultaneously measured for large helical device

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K. Fujii, T. Shikama, M. Goto, S. Morita, M. Hasuo
Journal: Physics of Plasmas
Phys. Plasmas 20, 012514 (2013)
https://doi.org/10.1063/1.4789454
Published: January 2013
View articletitled, Hydrogen transport diagnostics by atomic and molecular emission line profiles simultaneously measured for large helical device
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Journal Articles

Layout and results from the initial operation of the high-resolution x-ray imaging crystal spectrometer on the Large Helical Device

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N. A. Pablant, M. Bitter, L. Delgado-Aparicio, M. Goto, K. W. Hill, S. Lazerson, S. Morita, A. L. Roquemore, D. Gates, D. Monticello, H. Nielson, A. Reiman, M. Reinke, J. E. Rice, H. Yamada
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 83, 083506 (2012)
https://doi.org/10.1063/1.4744935
Published: August 2012
View articletitled, Layout and results from the initial operation of the high-resolution x-ray imaging crystal spectrometer on the Large Helical Device
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Journal Articles

Electron density dependence of intensity ratio for FeXXII extreme ultraviolet emission lines arising from different ground levels in electron beam ion trap and large helical device

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H. A. Sakaue, N. Yamamoto, S. Morita, N. Nakamura, C. Chen, D. Kato, H. Kikuchi, I. Murakami, S. Ohtani, H. Tanuma, T. Watanabe, H. Tawara
Journal: Journal of Applied Physics
J. Appl. Phys. 109, 073304 (2011)
https://doi.org/10.1063/1.3549707
Published: April 2011
View articletitled, Electron density dependence of intensity ratio for FeXXII extreme ultraviolet emission lines arising from different ground levels in electron beam ion trap and large helical device
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Journal Articles

Objectives and layout of a high-resolution x-ray imaging crystal spectrometer for the large helical device

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M. Bitter, K. Hill, D. Gates, D. Monticello, H. Neilson, A. Reiman, A. L. Roquemore, S. Morita, M. Goto, H. Yamada, J. E. Rice
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 81, 10E328 (2010)
https://doi.org/10.1063/1.3490016
Published: October 2010
View articletitled, Objectives and layout of a high-resolution x-ray imaging crystal spectrometer for the large helical device
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Journal Articles

Detachment stabilization with n / m = 1 / 1 resonant magnetic perturbation field applied to the stochastic magnetic boundary of the Large Helical Device

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M. Kobayashi, S. Masuzaki, I. Yamada, N. Tamura, Y. Feng, K. Sato, M. Goto, Y. Narushima, T. Akiyama, J. Miyazawa, M. Shoji, S. Morita, B. J. Peterson, H. Funaba, N. Ohyabu, K. Narihara, T. Morisaki, H. Yamada, A. Komori, LHD Experimental Group, D. Reiter
Journal: Physics of Plasmas
Phys. Plasmas 17, 056111 (2010)
https://doi.org/10.1063/1.3368681
Published: April 2010
View articletitled, Detachment stabilization with n / m = 1 / 1 resonant magnetic perturbation field applied to the stochastic magnetic boundary of the Large Helical Device
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Journal Articles

Development of multiwavelength-range fine-resolution spectrometer for hydrogen emissions and its application to large helical device periphery plasmas

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K. Fujii, K. Mizushiri, T. Nishioka, T. Shikama, A. Iwamae, M. Goto, S. Morita, S Kado, K. Sawada, M. Hasuo
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 81, 033106 (2010)
https://doi.org/10.1063/1.3356730
Published: March 2010
View articletitled, Development of multiwavelength-range fine-resolution spectrometer for hydrogen emissions and its application to large helical device periphery plasmas
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Journal Articles

Z eff profile diagnostics using visible bremsstrahlung continuum for nonaxisymmetric plasmas with finite β in large helical device

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H. Y. Zhou, S. Morita, M. Goto, C. F. Dong
Journal: Journal of Applied Physics
J. Appl. Phys. 107, 053306 (2010)
https://doi.org/10.1063/1.3326970
Published: March 2010
View articletitled, Z eff profile diagnostics using visible bremsstrahlung continuum for nonaxisymmetric plasmas with finite β in large helical device
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Journal Articles

Observation of an impurity hole in a plasma with an ion internal transport barrier in the Large Helical Device

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K. Ida, M. Yoshinuma, M. Osakabe, K. Nagaoka, M. Yokoyama, H. Funaba, C. Suzuki, T. Ido, A. Shimizu, I. Murakami, N. Tamura, H. Kasahara, Y. Takeiri, K. Ikeda, K. Tsumori, O. Kaneko, S. Morita, M. Goto, K. Tanaka, K. Narihara, T. Minami, I. Yamada, LHD Experimental Group
Journal: Physics of Plasmas
Phys. Plasmas 16, 056111 (2009)
https://doi.org/10.1063/1.3111097
Published: April 2009
View articletitled, Observation of an impurity hole in a plasma with an ion internal transport barrier in the Large Helical Device
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