29E36P
核融合炉運転に向けた制御ロジック構築に関する研究
Study on Construction of the control logic for nuclear fusion reactor operation
三善悠矢1)、小川雄一1)、中村誠2)
YUYA Miyoshi1), YUICHI Ogawa1), MAKOTO Nakamura2)
1) 東大新領域 2)日本原子力研究開発機構
1) Graduate School of Frontier Science, 2) JAEA
1.Introduction
In operating fusion experimental and DEMO
reactors, control of many various parameters would
be indispensable from the viewpoints not only ofplasma performance but also of engineering
requirements. For example, one is required to keep
the plasma density, temperature, fusion power andso on to the target values, by taking many physicaland/or engineering constraints such as the limitationof the heat flux to the divertor into account. For
satisfying these requirements, the consideration on
the diagnostics and the actuators is very important,because almost all of diagnostic tools might beunavailable under the environment of high radiationand methods of active control would be quite
limited. Taking these limitations and constraints, it
is, therefore, required to identify the combination ofdiagnostics and actuators and to construct thecontrol logic [1-3].
In this research, we focus on the construction of
the control logic. In the future reactor, we must
control the multiple plasma parameters with themultiple actuators, and each actuator doesn’t only
have an effect on single plasma parameter but on
multiple plasma parameters. For example, the NBI
have the effects on not only the plasma current but
also on the plasma temperature. Construction of thecontrol logic requires us to consider these effects.
For the first step of the construction of the control
logic, we made the 0-D (0-dimensional) control
logic from the simple 0-D model of plasma physics.
The detail will be shown in next section.
2. 0-D Control logic
Ideally, we want to control the plasma parameter
profile (i.e, density profile), but it is difficult. In thisresearch, for simplify, we control the 0-D integrated
value. The physical models which we use forconstruction of 0-D control logic are shown in eq.
(1) and eq. (2)(1)(2)

Where N, W, Npuff, Nloss, Sα, Lrad, PNBI, τp,and τe are
the total plasma ion particle amount, the total
plasma stored energy, the gas-puff amount, theparticle loss due to the fusion reaction, the alphaheating power, the radiation loss, the NBI power,
the particle confinement time and the energy
confinement time respectively. Because Nloss, S αand Lrad are the function of N and W, equation (1)and equation (2) can be written in the form ofeq.(3).
(3)
From eq. (3), we can make the control logic like eq.
(4).
(4)
Where Nref, Wref, k1and k2 are the target value of N,
target value of W, gain 1 and gain 2 respectively.
Deciding proper k1 and k2 , We can control N and W.
Using this control logic, we solve the eq. (1) and eq.
(2) with runge-kutta method. The example result isshown in Fig.1. In the annual meeting, we willshow the more detailed results and discussion.

Fig. 1 The red line, the blue line, green dashed line
and purple dashed line represent the particle
amount, stored energy, particle target value andstored energy target value respectively.

References[1] J.A.Snapes et al., Fusion Engineering andDesign 85 461-465 (2010).
[2] B.Goncalves et al., Energy Conversion andManagement 51 1751-1757 (2010).
[3] Y.Kamata, J.Plasma Fusion Res. Vol.86. No9.
519-523 (2010) (in Japanese).