Feedback control of the safety factor profile evolution during formation of an advanced tokamak discharge

J. R. Ferron; P. Gohil; C. M. Greenfield; J. Lohr; T. C. Luce; M. A. Makowski; D. Mazon; M. Murakami; C. C. Petty; P. A. Politzer; M. R. Wade

doi:10.1088/0029-5515/46/10/L01

Feedback control of the safety factor profile evolution during formation of an advanced tokamak discharge

J. R. Ferron, P. Gohil, C. M. Greenfield, J. Lohr, T. C. Luce, M. A. Makowski, D. Mazon, M. Murakami, C. C. Petty, P. A. Politzer, M. R. Wade

Research output: Contribution to journal › Article › peer-review

47 Scopus citations

Abstract

Active feedback control for regulation of the safety factor (q) profile at the start of the high stored energy phase of an advanced tokamak discharge has been demonstrated in the DIII-D tokamak. The time evolution of the on-axis or minimum value of q is controlled during and just following the period of ramp-up of the plasma current using electron heating to modify the rate of relaxation of the current profile. In L-mode and H-mode discharges, feedback control of q is effective with the appropriate choice of either off-axis electron cyclotron heating or neutral beam heating as the actuator. The q profile is calculated in real time from a complete equilibrium reconstruction fitted to external magnetic field and flux measurements and internal poloidal field measurements from the motional Stark effect diagnostic.

Original language	English
Article number	L01
Pages (from-to)	L13-L17
Journal	Nuclear Fusion
Volume	46
Issue number	10
DOIs	https://doi.org/10.1088/0029-5515/46/10/L01
State	Published - Oct 1 2006
Externally published	Yes

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title = "Feedback control of the safety factor profile evolution during formation of an advanced tokamak discharge",

abstract = "Active feedback control for regulation of the safety factor (q) profile at the start of the high stored energy phase of an advanced tokamak discharge has been demonstrated in the DIII-D tokamak. The time evolution of the on-axis or minimum value of q is controlled during and just following the period of ramp-up of the plasma current using electron heating to modify the rate of relaxation of the current profile. In L-mode and H-mode discharges, feedback control of q is effective with the appropriate choice of either off-axis electron cyclotron heating or neutral beam heating as the actuator. The q profile is calculated in real time from a complete equilibrium reconstruction fitted to external magnetic field and flux measurements and internal poloidal field measurements from the motional Stark effect diagnostic.",

author = "Ferron, {J. R.} and P. Gohil and Greenfield, {C. M.} and J. Lohr and Luce, {T. C.} and Makowski, {M. A.} and D. Mazon and M. Murakami and Petty, {C. C.} and Politzer, {P. A.} and Wade, {M. R.}",

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AU - Ferron, J. R.

AU - Gohil, P.

AU - Greenfield, C. M.

AU - Lohr, J.

AU - Luce, T. C.

AU - Makowski, M. A.

AU - Mazon, D.

AU - Murakami, M.

AU - Petty, C. C.

AU - Politzer, P. A.

AU - Wade, M. R.

PY - 2006/10/1

Y1 - 2006/10/1

N2 - Active feedback control for regulation of the safety factor (q) profile at the start of the high stored energy phase of an advanced tokamak discharge has been demonstrated in the DIII-D tokamak. The time evolution of the on-axis or minimum value of q is controlled during and just following the period of ramp-up of the plasma current using electron heating to modify the rate of relaxation of the current profile. In L-mode and H-mode discharges, feedback control of q is effective with the appropriate choice of either off-axis electron cyclotron heating or neutral beam heating as the actuator. The q profile is calculated in real time from a complete equilibrium reconstruction fitted to external magnetic field and flux measurements and internal poloidal field measurements from the motional Stark effect diagnostic.

AB - Active feedback control for regulation of the safety factor (q) profile at the start of the high stored energy phase of an advanced tokamak discharge has been demonstrated in the DIII-D tokamak. The time evolution of the on-axis or minimum value of q is controlled during and just following the period of ramp-up of the plasma current using electron heating to modify the rate of relaxation of the current profile. In L-mode and H-mode discharges, feedback control of q is effective with the appropriate choice of either off-axis electron cyclotron heating or neutral beam heating as the actuator. The q profile is calculated in real time from a complete equilibrium reconstruction fitted to external magnetic field and flux measurements and internal poloidal field measurements from the motional Stark effect diagnostic.

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Feedback control of the safety factor profile evolution during formation of an advanced tokamak discharge

Abstract

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