Abstract
The study on the plasma position control of ITER EDA performed by Japan Home Team during the sensitivity study in 1994 is summarized. The controllabilities of plasmas in the Outline Design and elongated version are compared. The model used to describe the motion of the plasma is a rigid model. The PD feedback control is applied with respect to the displacements of the plasma from the equilibrium. Three types of fluctuations, which initiate the motion of the plasma, are examined, namely a finite horizontal fluctuation field, a small horizontal fluctuation field such that the motion of the plasma is governed by the passive structures and an abrupt change of the poloidal beta {beta}{sub p} and internal inductance l{sub i}. In the simulations of finite horizontal fluctuation fields, controls depend on the strength of the fluctuations, for instance, 3-5V is needed for 5-10G of fluctuation fields in the Outline Design. When the fluctuation field is small and the plasma displacement grows in a characteristic time of the passive structures, a few volt of the control voltage is enough to obtain good controllability. It is shown that the control when ({beta}{sub p}, l{sub i}) changes simultaneously is demanding and a large control
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Senda, Ikuo;
Nishio, Satoshi;
Tsunematsu, Toshihide;
[1]
Nishino, Toru;
Fujieda, Hirobumi
- Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment
Citation Formats
Senda, Ikuo, Nishio, Satoshi, Tsunematsu, Toshihide, Nishino, Toru, and Fujieda, Hirobumi.
The plasma position control of ITER EDA plasma.
Japan: N. p.,
1994.
Web.
Senda, Ikuo, Nishio, Satoshi, Tsunematsu, Toshihide, Nishino, Toru, & Fujieda, Hirobumi.
The plasma position control of ITER EDA plasma.
Japan.
Senda, Ikuo, Nishio, Satoshi, Tsunematsu, Toshihide, Nishino, Toru, and Fujieda, Hirobumi.
1994.
"The plasma position control of ITER EDA plasma."
Japan.
@misc{etde_10121617,
title = {The plasma position control of ITER EDA plasma}
author = {Senda, Ikuo, Nishio, Satoshi, Tsunematsu, Toshihide, Nishino, Toru, and Fujieda, Hirobumi}
abstractNote = {The study on the plasma position control of ITER EDA performed by Japan Home Team during the sensitivity study in 1994 is summarized. The controllabilities of plasmas in the Outline Design and elongated version are compared. The model used to describe the motion of the plasma is a rigid model. The PD feedback control is applied with respect to the displacements of the plasma from the equilibrium. Three types of fluctuations, which initiate the motion of the plasma, are examined, namely a finite horizontal fluctuation field, a small horizontal fluctuation field such that the motion of the plasma is governed by the passive structures and an abrupt change of the poloidal beta {beta}{sub p} and internal inductance l{sub i}. In the simulations of finite horizontal fluctuation fields, controls depend on the strength of the fluctuations, for instance, 3-5V is needed for 5-10G of fluctuation fields in the Outline Design. When the fluctuation field is small and the plasma displacement grows in a characteristic time of the passive structures, a few volt of the control voltage is enough to obtain good controllability. It is shown that the control when ({beta}{sub p}, l{sub i}) changes simultaneously is demanding and a large control voltage is required to maintain satisfactory control. Comparing the elongated version with the Outline Design, the control voltage which is larger than the Outline Design by a factor of 2-3 is required to obtain the same controllability in the elongated version. (author).}
place = {Japan}
year = {1994}
month = {Sep}
}
title = {The plasma position control of ITER EDA plasma}
author = {Senda, Ikuo, Nishio, Satoshi, Tsunematsu, Toshihide, Nishino, Toru, and Fujieda, Hirobumi}
abstractNote = {The study on the plasma position control of ITER EDA performed by Japan Home Team during the sensitivity study in 1994 is summarized. The controllabilities of plasmas in the Outline Design and elongated version are compared. The model used to describe the motion of the plasma is a rigid model. The PD feedback control is applied with respect to the displacements of the plasma from the equilibrium. Three types of fluctuations, which initiate the motion of the plasma, are examined, namely a finite horizontal fluctuation field, a small horizontal fluctuation field such that the motion of the plasma is governed by the passive structures and an abrupt change of the poloidal beta {beta}{sub p} and internal inductance l{sub i}. In the simulations of finite horizontal fluctuation fields, controls depend on the strength of the fluctuations, for instance, 3-5V is needed for 5-10G of fluctuation fields in the Outline Design. When the fluctuation field is small and the plasma displacement grows in a characteristic time of the passive structures, a few volt of the control voltage is enough to obtain good controllability. It is shown that the control when ({beta}{sub p}, l{sub i}) changes simultaneously is demanding and a large control voltage is required to maintain satisfactory control. Comparing the elongated version with the Outline Design, the control voltage which is larger than the Outline Design by a factor of 2-3 is required to obtain the same controllability in the elongated version. (author).}
place = {Japan}
year = {1994}
month = {Sep}
}