Publication

Feedback stabilization of axisymmetric modes in the TCV tokamak using active coils inside and outside the vacuum vessel

Yves Martin, Jean-Marc Moret
1998
Journal Articles

Abstract

A new vertical position control system, including an internal active coil, has become operational on TCV. The new system has made it possible to stabilize plasmas with open loop growth rates up to 4400 s(-1), currents up to 1.0 MA and elongations up to 2.58. The closed loop stability of the new system has been analysed with a numerical model in which the plasma is assumed to be undeformable, and the power supply outputs are delayed with respect to their inputs. Model predictions agree with the main experimental results.

Official source

https://infoscience.epfl.ch/entities/publication/dd123f38-a0e4-4a5a-b419-21fffa6f2f8b

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Yves Martin, Jean-Marc Moret
1998
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/dd123f38-a0e4-4a5a-b419-21fffa6f2f8b

About this result

Related concepts (32)

Closed-loop controller

A closed-loop controller or feedback controller is a control loop which incorporates feedback, in contrast to an open-loop controller or non-feedback controller. A closed-loop controller uses feedback to control states or outputs of a dynamical system. Its name comes from the information path in the system: process inputs (e.g., voltage applied to an electric motor) have an effect on the process outputs (e.g., speed or torque of the motor), which is measured with sensors and processed by the controller; the result (the control signal) is "fed back" as input to the process, closing the loop.

Negative feedback

Negative feedback (or balancing feedback) occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output, whether caused by changes in the input or by other disturbances. Whereas positive feedback tends to lead to instability via exponential growth, oscillation or chaotic behavior, negative feedback generally promotes stability. Negative feedback tends to promote a settling to equilibrium, and reduces the effects of perturbations.

Plasma stability

The stability of a plasma is an important consideration in the study of plasma physics. When a system containing a plasma is at equilibrium, it is possible for certain parts of the plasma to be disturbed by small perturbative forces acting on it. The stability of the system determines if the perturbations will grow, oscillate, or be damped out. In many cases, a plasma can be treated as a fluid and its stability analyzed with magnetohydrodynamics (MHD).

Related publications (32)

Feedback stabilization of axisymmetric modes in the TCV tokamak using active coils inside and outside the vacuum vessel

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