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Observation of ion cyclotron range of frequencies mode conversion plasma flow drive on Alcator C-Moda)
a)Paper BI2 6, Bull. Am. Phys. Soc. , 23 (2008).
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View: Figures


Image of FIG. 1.
FIG. 1.

Plasma configuration for the experiment (a) D(H) MH at 80 MHz; (b) MC heating at 50 MHz. Both plasmas have , and in upper-single-null.

Image of FIG. 2.
FIG. 2.

Layout of the PCI system (vertical laser beam) and x-ray crystal spectral tomography system (side view).

Image of FIG. 3.
FIG. 3.

Data traces comparison of the MH plasma (blue dashed line) and MC plasma (red solid line): (a) Central toroidal rotation; (b) and ; (c) .

Image of FIG. 4.
FIG. 4.

Change in toroidal rotation velocity at different viewing chords responding to the application of rf power at 0.8 s.

Image of FIG. 5.
FIG. 5.

(a) Tomographically inverted toroidal rotation profiles (on the midplane on the LFS of the axis) for the MC and MH plasmas shown in Fig. 3 ; (b) The difference of rotation with and without rf power.

Image of FIG. 6.
FIG. 6.

Toroidal rotation scaling: (a) vs intrinsic rotation scaling law ; (b) vs . Lines are linear fits of the data.

Image of FIG. 7.
FIG. 7.

Change in poloidal rotation profile (Ohmic is subtracted) at different rf power levels: (a) MC; (b) MH.

Image of FIG. 8.
FIG. 8.

(a) Spectra vs time of density fluctuations measured by PCI; (b) poloidal rotation trace at ; (c) .

Image of FIG. 9.
FIG. 9.

Antenna phase dependence of rotation: (a) ; (b) . The antenna phase of the 50 MHz rf is labeled at the top. Total rf power 3.4 MW (1.7 MW at 50 MHz and 1.7 MW from 80 MHz) at .

Image of FIG. 10.
FIG. 10.

Flow drive efficiency vs field. The corresponding major radii of IC resonance and MC are also indicated. Magnetic axis at . The dashed line is an order of three polynomial fit of the data points.

Image of FIG. 11.
FIG. 11.

Mode converted waves measured by PCI of the MC plasma shown in Fig. 3 : (a) amplitude (in terms of density fluctuation) vs time and major radius; (b) -spectra vs time.

Image of FIG. 12.
FIG. 12.

Direct rf power to electrons: (a) direct electron heating profile calculated from break-in-slope of ECE signals; (b) deposition profile from simulation .

Image of FIG. 13.
FIG. 13.

Direct power to ions: (a) 2D power deposition from simulation with FW and MC ICW labeled; (b) flux surface averaged profile.

Image of FIG. 14.
FIG. 14.

Argon impurity temperature from the x-ray spectra measurement and electron temperature from ECE ( of the plasmas shown in Fig. 3 , averaged over two sawtooth periods).

Image of FIG. 15.
FIG. 15.

(a) Radial electric field profile; (b) shearing rate (brown solid and dashed lines), and maximum linear growth rate from ( of the MC plasma shown in Fig. 3 ).


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Scitation: Observation of ion cyclotron range of frequencies mode conversion plasma flow drive on Alcator C-Moda)