![]() The cusp field also plays an important role in providing a surface for a 2.45 GHz ? electron-cyclotron resonance. The entire (1.1 meter long) electrode is shown in (a), with detailed views of (b) the graphite heater filament and (c) the LaB6 tip. The cylindrical LaB 6 cathode is radiatively heated up to 1600° C by an internal graphite heater filament. The electrodes are biased up to 300 V to create cross-field currents that create an edge-localized torque on the plasma. Lanthanum Hexaboride is used as a high temperature (2-15? eV), high density (10 17-10 18 m -3) plasma source due to its high input power density and robust construction. The central dark blue contour shows the region where the magnet-produced field is less than 0.2 gauss and the red contour shows the 875 G ECH resonance surface. The magnetic field is generated by axisymmetric rows of 4000 G SmCo magnets with alternating polarity. (a) Poloidal magnetic flux contours for the BRB (magnetic field lines) and color contours of the magnetic field strength as computed by the MaxwellSV finite element modeling package and (b) a closeup of the cusp. ![]() Depending on the type of source used and the input power, plasmas ranging in temperature from 2-15 eV and densities ranging from 10 17-10 18 m -3. Typical electron temperature and density measurements of this plasma give a very homogeneous plasma with a sharp edge near the wall. The field from the multi-cusp magnets is highly concentrated at the wall resulting in a large volume of unmagnetized plasma. The BRB confines about 14 m 3 of plasma with a? convective plasma loss surface area of about 0.2 m 2. These particles stream out along the field lines onto alumina ceramic tiles and represent the primary loss mechanism of particles and heat from the plasma. Each cusp magnetic field acts like a local magnetic mirror confining the charged particles within the vessel except for those particles with velocities within the loss cone of the magnetic cusp. Plasmas generated within the vessel are confined by an array of samarium cobalt (SmCo) magnets consisting of 18 rings with alternating polarity magnets comprising a 36-pole magnetic field.
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