Beam Physics Seminar
Visible light emission from the Alcator C-Mod tokamak has been used to
determine quantitative information about the edge and divertor
regions. This emission originated primarily from hydrogen/deuterium
entering the plasma from the walls. The light was collected from various
regions of the plasma via optical fibers and coupled to a high-resolution
grating spectrograph. Line width measurements were used to determine
the temperature and density of the plasma using Doppler Broadening of
the Ha emission and Stark broadening of the high-n members of the Balmer
series. Line shift measurements were used to determine the magnetic
field from the Zeeman pattern, the plasma flow velocity from the Doppler
shift, and the ratio of the concentrations of the isotopes of hydrogen
from the isotope shift.
Talk Slides:
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(Coffee & Cookies before the seminar starting 9:30 AM)