Internal Transport Barrier Experiments on Alcator C-Mod

Details Internal Transport Barrier Experiments on Alcator C-Mod Internal Transport Barrier Experiments on Alcator C-Mod

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre16002w&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

In Alcator C-Mod, internal transport barriers (ITB), in plasmas with conditions similar to those expected in reactor plasmas, have been investigated. Discharges with an ITB exhibit improved core confinement in one or more of the ion or electron thermal, particle, or momentum channels. Studies of ITBs in thermally equilibrated plasmas at high density are of practical importance to a future fusion reactor, and are also of fundamental physics interest. Here we report the observation and transport analysis of ITB discharges created with off-axis ion cyclotron range of frequencies (ICRF) heating, and controlled with additional central ICRF power. An ITB is produced in discharges when an edge transport barrier is present and where the peak in the power deposition profile is at |r/a| 0.5. In these discharges, the density profile becomes peaked without the presence of a particle source in the plasma core and could be controlled with the additional central ICRF heating. Monitoring sawteeth, an internal reconnection event, heat pulse propagation, there is an abrupt radial discontinuity in the propagation when an ITB is present and this discontinuity appears to move into the core plasma from the edge region.

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