Abstract
Two neutral-beam based diagnostic techniques are numerically evaluated for the stellarator TJ-II. The evaluation considers the beam from a dedicated diagnostic neutral beam injector that provides a 5 ms pulse of hydrogen accelerated to 30 keV as well as the light throughput of a dual purpose optical system that views the beam as it traverses the microwave, or neutral beam, heated plasmas of this magnetic confinement device. In the first instance, in which the implementation of the beam emission spectroscopy technique is considered for characterizing medium to long wavelength plasma turbulence, detailed estimates are made to determine the Balmer Hα light intensity reaching avalanche photodiode modules. In the second instance, similar detailed estimates are made for the spectrograph-based experimental set-up used for the Motional Stark Emission technique that has been successfully employed to determine the magnitude and direction of the internal magnetic field in TJ-II plasmas. In addition, optical measurements made to evaluate beam energy and composition are described. Finally, estimates and measurements are compared and discussed in order to complete this work.
Similar content being viewed by others
References
R.C. Isler, Plasma Phys. Control. Fusion 36, 171 (1994)
F.M. Levinton et al., Phys. Rev. Lett. 63, 2060 (1989)
A.R. Field et al., Rev. Sci. Instrum. 80, 073503 (2009)
G.F. Abdrashitov et al., Rev. Sci. Instrum. 72, 34 (2001)
K.J. McCarthy et al., Rev. Sci. Instrum. 75, 3499 (2004)
L. Hausamman et al., Plasma Phys. Control. Fusion 59, 025017 (2017)
F. Castejón et al., Nucl. Fusion 57, 102022 (2017)
F.L. Tabarés et al., Contrib. Plasma Phys. 50, 610 (2010)
K.J. McCarthy et al., Proceedings XXXIII Reunión Bienal de la Real Sociedad Española de Física, Santander, Spain; Part IV (PUbliCan, Santander, 2011), pp. 65–67
J. Arévalo et al., Nucl. Fusion 53, 023003 (2013)
J.M. Carmona et al., Rev. Sci. Instrum. 77, 10F107 (2006)
K.J. McCarthy et al., Contrib. Plasma Phys. 55, 459 (2015)
T. Oishi et al., Rev. Sci. Instrum. 75, 4118 (2004)
B. Liu et al., Nucl. Fusion 55, 112002 (2015)
W. Mandl et al., Plasma Phys. Control. Fusion 35, 1373 (1993)
A. Boileau et al., J. Phys. B: At. Mol. Opt. Phys. 22, L145 (1989)
R.C. Wolf et al., Nucl. Fusion 33, 1835 (1993)
N.A. Pablant et al., Rev. Sci. Instrum. 79, 10F517 (2008)
E. Speth, Rep. Prog. Phys. 52, 57 (1989)
J. Fu et al., J. Korean Phys. Soc. 58, 1141 (2011)
J. Mlynar, “TCV DNBI Profile and Attenuation Studies with Code Manual”, Report LRP 692/01, CRPP EPFL, Lausanne
F. Tabarés et al., J. Nucl. Mat. 290–295, 748 (2001)
J.M. Fontdecaba et al., Plasma Fusion Res. 5, S2085 (2010)
R.E. Bell, Rev. Sci. Instrum. 75, 4158 (2004)
I.H. Hutchinson, Plasma Phys. Control. Fusion 44, 71 (2002)
J. Herranz et al., Fusion Eng. Des. 65, 525 (2003)
R.K. Janev et al., Elementary process in Hydrogen-helium Plasmas, Cross Sections and Reaction rate Coefficients (Springer, Berlin, 1987)
D.Q. Nagasawa et al., Proc. SPIE 9908, 99085C (2016)
J. Loicq et al., Appl. Opt. 52, 8338 (2013)
J.A. Arns et al., Proc. SPIE 3779, 313 (1999)
K.J. McCarthy et al., EPL 120, 25001 (2017)
Acknowledgements
KJM acknowledges financial support from the Spanish MICINN (FIS2017-89326R). This work was supported by the Ministerio de Ciencia, Innovación y Universidades under the Grant No BES-2015-075704.
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
McCarthy, K.J., Panadero, N. & López-Miranda, B. Numerical Considerations for Neutral Beam Spectroscopy Based Diagnostics in the Stellarator TJ-II. J Fusion Energ 39, 230–239 (2020). https://doi.org/10.1007/s10894-020-00248-3
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10894-020-00248-3