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Vertical Stability and Control. C. Kessel, NSO/PAC, UW, 7/10-11/2001. Design passive structures to slow vertical instability for feedback control and provide a stability factor fs > 1.2 Passive stabilizers are 1.5 cm thick Cu, toroidally continuous on outboard and inboard sides

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vertical stability and control
Vertical Stability and Control

C. Kessel, NSO/PAC, UW, 7/10-11/2001

  • Design passive structures to slow vertical instability for feedback control and provide a stability factor fs > 1.2
  • Passive stabilizers are 1.5 cm thick Cu, toroidally continuous on outboard and inboard sides
  • For most unstable plasmas (full elongation and low pressure), over the range 0.7 < li(3) < 1.1, the stability factor is 1.3 < fs < 1.13 and growth time is 43 < tg(ms) < 19
  • Utilize internal control coils for feedback on the plasma vertical position, located just outside the inner VV, with second coil installed for redundancy
  • Control simulations indicate that for random disturbances with DZrms = 1 cm, and step step disturbances with DZ = 2 cm, the peak power is 5-10 MVA, with I(peak) = 55-75 kA-turns and V(peak) = 50-75 V/turn
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