26aE28P
JT-60SAに向けた複合実時間制御と運転シナリオの開発	 
Development of integrated real-time controls and operation scenarios
for JT-60SA	 
鈴木 隆博, 林 伸彦, 若月 琢馬, 宮田 良明, 本多 充, 井手 俊介
SUZUKI Takahiro, HAYASHI Nobuhiko, WAKATSUKI Takuma, MIYATA Yoshiaki,
HONDA Mitsuru, IDE Shunsuke
原子力機構
JAEA
The JT-60SA experiment program [1] is aimed at
supporting ITER and providing the physics basis
and guidelines for DEMO design having broadconceptual spectrum. In achieving mission goals ofITER and designing DEMO, control, especiallyreal-time control, of physics parameters play anessential role. Successful realization of ITER
standard operation at Q=P /Pex=10 needs control ofburning state where self heating by fusion alphaparticle (P ) exceeds external heating power (Pex)for control. In realizing ITER steady-state operation
at Q=5 where large bootstrap current at high plasmapressure (normalized beta βN) contributes toachieve full non-inductive current drive (full-CD)of plasma current, controls of MHD stability at highbeta as well as full-CD state are required.
JT-60SA is designed to contribute todevelopment of the control issues above [2]. We
have been developing an integrated real-time
control system to be applied to and examined in theJT-60SA experiment. The development is carriedout on the TOPICS integrated code suite where
thermal transport is modeled as CDBM turbulent
transport that reasonably well explains the JT-60U
experiment [3]. Plasma density profile and pedestal
temperature is prescribed to give thermal energy
confinement time agrees with the H98(y,2) scaling.
The controller under development is a multi-input
multi-output controller having a matrix of PID
controllers and is flexibly extensible to control ofvarious physics parameters:
αα! P (t + dt) $ ! P (t + dt) $! β (t) − β (t) $Nref
N# 1& # PP1&#&,# P2 (t + dt) & = # PPP 2 (t + dt) & + M # Vloop ref (t) −Vloop (t) &##&& ##&&
##&&!
!
!
"% "
%
"%" PID
PID12 ! %11$'.
where(1)M ≡ $ PID 21 PID 22 ! '$$''""# &#The controller (1) feedback controls βN to its

given reference βNref and loop voltage Vloop to itsreference Vloop ref using combination of command
output P1 and P2 of actuators through PID matrix M.
The first term of the right-hand-side of eq (1), PPP1
and PPP2, is the pre-programmed output to be given
prior to control. Our previous work [4] investigatedsimultaneous controllability of βN and Vloop(essential parameter to full-CD) in real-time inJT-60SA as well as dependence of thecontrollability on plasma density in TOPICS
simulations.
In this study, we have explored integrated
real-time control of 3 physics parameters essentialin steady sustainment of high beta plasma, namely
βN, Vloop and the minimum of the safety factor
profile qmin. This qmin determines the existence ofthe low-q rational surface at which steep pressure
gradient is prone to provoke MHD instability.
These parameters, βN, Vloop and qmin are controlled
by heating power, total CD power and differential
current drive power (off-axis CD power minus
on-axis CD power), respectively.
We have also developed control scheme of alphaheating where the alpha heating is simulated(numerically here and experimentally in JT-60SA
DD operation) using exclusively allocated part of
EC+NB heating power. Although study of “real”
burning plasma must wait for ITER DT campaign,
we hope to investigate a part of burning plasma
behavior and develop a controller with this scheme
prior to ITER experiment. We show thecontrollability of the simulated alpha heating at
H-mode entry in JT-60SA.
[1] Y. Kamada, Nucl. Fusion 53 (2013) 104010[2] JT-60SA Research Plan Version 3.2, Chapter 3;
http://www-jt60.naka.jaea.go.jp/jt60/pdf/JT-60SA%
20Research%20Plan%20Ver.3.2.pdf[3] J. Garcia, N. Hayashi et al., Nucl. Fusion 54(2014) 093010[4] T. Suzuki et al., 40th EPS Conf. (Espoo, 2013) P2.136