ABSTRACT
IAEA-F4-TM-42581
IAEA Technical Meeting on Atomic, Molecular and Plasma Material Interaction Data for
Fusion Science and Technology
Magnetic field sensitive spectroscopic lines and their prospects in
atomic and astrophysics
Y. Yanga, W. Lia, R. Huttona, T. Brageb, Y. Zoua
a
Institute of Modern Physics, Fudan University, Shanghai, China
b
Lund University, Lund, Sweden
E-mail address of main author: yangyang@fudan.edu.cn
Magnetic fields play an important role in determining the properties of plasmas, for example,
through driving the energetics and dynamics of enormous solar flares on the surface of the
sun. They are also used to restrict huge plasma fluxes in man made fusion device like
Tokamak. Measuring the structure of magnetic field in such plasmas is therefore extremely
important and useful for understanding and plasma control. The problem is that there are
always many inconvenience or limitations on measuring the magnetic field in high
temperature plasmas with traditional methods like Zeeman splitting.
A new possible method of measuring magnetic fields in such plasmas based on magnetic field
sensitive (MFS) spectroscopic lines is under development. The main principle is that external
magnetic field will lead a mixture of near quantum states leading to unexpected transitions to
occur， whose strength is depended on the external magnetic field. Measuring strengths of
these spectroscopic lines will lead to much information about the local magnetic field
structure.
The first measurement of magnetic field sensitive line 2p53s 3P0-2p6 1S0 of Ne-like Ar ions
was done at the Livermore EBIT and reported in 2003[1] .We followed this study, and
calculated and measured different MFS lines of different ions[2-3] and found many
possibilities for application to Tokamak plasma magnetic field diagnostics.
Recently we have been working on a spectral line in a single charge state of Iron which shows
extreme sensitivity to its surrounding magnetic field. Through continuing these studies we
hope to be able to suggest a method for measuring magnetic fields in hot plasma such as solar
flare. We expect to have more to report on this at the time of the meeting.
[1] P. Beiersdorfer, J. H. Scofield, and A. L. Osterheld, Phys. Rev. Lett. 90, 235003 (2003).
[2] J. Li, J. Grumer, W. Li, M. Andersson, T. Brage, R. Hutton, P. Jonsson, Y. Yang, and Y. Zou, Phys.
Rev. A 88, 013416(2013)
[3] J. Grumer, W. Li, D. Bernhardt, J. Li, S. Schippers, T. Brage, P. Jonsson, R. Hutton, and Y. Zou, Phys.
Rev. A 88, 022513(2013)
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