Plasma-External Circuit Interaction in the Burn Control with Vertical Field

Casci, Federico; Minardi, E.

doi:10.13182/fst83-a22783

Cited by 2 publications

(2 citation statements)

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“…This is not surprising since a time dependent solution of system (2.1), corresponding to any prescribed function R(t) sufficiently close to the marginal ignition solution (such that P a -PL = 0 and ^ = 0), is unstable under the same conditions as is the marginal solution [8]. The inclusion of the circuit equations for the current does not change essentially this situation [9].…”

Section: Instability Of the Regulated Plasma Positionmentioning

confidence: 99%

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Plasma position control in a tokamak reactor around ignition

Carretta

Minardi²,

Bacelli³

1986

Nucl. Fusion

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Plasma position control in a tokamak reactor in the phase approaching ignition is closely related to burn control. If ignited burn corresponds to a thermally unstable situation the plasma becomes sensitive to the thermal instability already in the phase when ignition is approached so that the trajectory in the positionpressure (R, p) space becomes effectively unpredictable. -For example, schemes involving closed cycles around ignition can be unstable in the heating-cooling phases, and the deviations may be cumulative in time. -Reliable plasma control in pressure-position (p, R) space is achieved by beforehand constraining the p, R trajectory rigidly with suitable feedback vertical field stabilization, which is to be established already below ignition. -A scheme in which ignition is approached in a stable and automatic way by feedback stabilization on the vertical field is proposed and studied in detail. -The values of the gain coefficient ensuring stabilization and the associated p and R excursions are discussed both analytically, with a 0-D approximation including non-linear effects, and numerically, with a 1-D code in cylindrical geometry. Profile effects increase the excursions, in particular above ignition.

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Section: Instability Of the Regulated Plasma Positionmentioning

confidence: 99%

“…The vertical field can be assumed to be controlled by p(r) according to the relation [9]: g ( r ) = B s K…”

Section: The Road Towards Ignitionmentioning

confidence: 99%