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Nicholas Tsoulfanidis—ANS member since 1969
We welcome ANS members who have careered in the community to submit their own Nuclear Legacy stories, so that the personal history of nuclear power can be captured. For information on submitting your stories, contact nucnews@ans.org.
As an undergraduate I studied physics at the University of Athens. I entered the university in 1955 after successfully passing a national exam (came up fourth in a field of about 700 candidates). Upon graduation and finishing my mandatory two-year military service, the plan was to teach physics either in a public high school or as a tutor for a private for-profit institution, preparing high school students for the national exam.
M. G. Shats, J. H. Harris, J. B. Wilgen, L. R. Baylor, J. D. Bell, C. H. Ma, M. Murakami, T. S. Bigelow, G. L. Bell, R. J. Colchin, R. A. Dory, J. L. Dunlap, G. R. Dyer, A. C. England, G. R. Hanson, D. P. Hutchinson, R. C. Isler, T. C. Jernigan, R. A. Langley, D. K. Lee, J. F. Lyon, A. L. Quails, D. A. Rasmussen, R. K. Richards, M. J. Saltmarsh, J. E. Simpkins, K. L. Vander Sluis, K. M. Likin, K. A Sarksyan, S. C. Aceto, J. J. Zielinski
Fusion Science and Technology | Volume 27 | Number 3 | April 1995 | Pages 481-484
Confinement and Transport Studies | doi.org/10.13182/FST95-A11947133
Articles are hosted by Taylor and Francis Online.
Density fluctuations in low-collisionality, low-beta (β ~ 0.1%), currentless plasmas produced with electron cyclotron heating (ECH) in the Advanced Toroidal Facility (ATF) torsatron have been studied using a 2-mm microwave scattering diagnostic. Pulsed gas puffing is used to produce transient steepening of the density profile from its typically flat shape; this leads to growth in the density fluctuations when the temperature and density gradients both point in the same direction in the confinement region. The wave number spectra of the fluctuations that appear during this perturbation have a maximum at higher k⊥ρ, (~1) than is typically seen in tokamaks. The in-out asymmetry of the fluctuations along the major radius correlates with the distribution of confined trapped particles expected for the ATF magnetic field geometry. During the perturbation, the relative level of the density fluctuations in the confinement region (integrated over normalized minor radii p from 0.5 to 0.85) increases from ñ/n ~ 1% when the density profile is flat to ñ/n ~ 3% when the density profile is steepened. These observations are in qualitative agreement with theoretical expectations for helical dissipative trapped-electron modes (DTEMs), which are drift-wave instabilities associated with particle trapping in the helical stellarator field.