JPS61245499A - Lowpass mixed wave heater connection system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a nuclear fusion device, and relates to a coupling system for a low-frequency hybrid wave heating device that heats or drives plasma with current.

[Technical background of the invention] A conventional example will be explained with reference to FIGS. 4 to 7.

FIG. 4 is a longitudinal cross-sectional view showing a schematic configuration of the nuclear fusion device, and reference numeral 1 in the figure indicates a vacuum vessel. This vacuum container 1 has a toroidal shape and maintains a high vacuum state inside to form plasma 2. A blanket 3 is installed on the inner peripheral side of the vacuum container 1 so as to surround the plasma 2.

This blanket 3 accommodates lithium as a tritium breeding material therein, and is provided with a coolant flow path for cooling the lithium. The blanket 3 reacts high-energy neutrons emitted from the plasma 2 with lithium to generate tritium, and extracts the thermal energy generated at this time to the outside via the coolant flowing through the coolant flow path.

A shielding body 4 is installed on the outer peripheral side of the vacuum container 1, and the shielding body 4 prevents radiation from leaking to the outside. Further, on the outer peripheral side of this shield 4, a toroidal coil 5 is installed in the toroidal direction of the vacuum container 1, and a main voloidal coil 6, a sub-poloidal coil 7, and a magnetic limiter coil 8 are installed in the poloidal direction of the vacuum container 1. is installed. The toroidal coil 5 and both poloidal coils 6.7 form a magnetic field generating coil. Further, the magnetic limiter coil 8 is connected to the vacuum container 1.
The shape of the plasma 2 inside is restricted by magnetic lines of force. Further, each of these coils and the vacuum container 1 are placed and fixed on a pedestal 13.

A center column 11 is disposed in the center of the vacuum container 1 so as to penetrate vertically. A current transformer coil 12 is wound around the outer periphery of this central support 11.
2 and the magnetic field generating coil constitute a current transformer.

Then, a high current is passed through the magnetic field generating coil, and the vacuum vessel 1 is
Generates a magnetic field within. The plasma 2 in the vacuum container 1 is Joule heated and raised in temperature by the current generated by the generated magnetic field. Note that reference numeral 19 in FIG. 4 is an exhaust pipe, which is connected to a vacuum evacuation device (not shown) through the exhaust pipe 19 to maintain the inside of the vacuum container 1 at a high vacuum.

A low range hybrid wave heating device (hereinafter referred to as LHRF) 21 is installed around the vacuum vessel 1 .

This LHRF 21 generally has the following configuration.

The high frequency wave emitted from the high frequency excitation section is amplified by the amplifier section and transferred to the power feeding section. The high frequency transferred to the power supply section is transmitted to the plasma 2 by the LHRF coupling system 22 via the transmission system.
injected into. It is thereby constituted by a waveguide bundle 23 consisting of waveguides 24.

[Problems with background technology] According to the above configuration, there were the following problems.

Generally, deuterium-tritium reaction (hereinafter referred to as DT reaction)
LHR installed in a nuclear fusion device that generates neutrons by
The F-coupled system 22 requires active cooling to remove the heat load due to nuclear heating, radio frequency heat exchange (RF loss), and particles and radiation from the plasma 2, which are also caused by neutrons. In this case, the coupling system of one boat consists of hundreds of waveguides 24, and since the intervals between the waveguides 24 are narrow, it is especially difficult to install cooling piping between them. Can not. Therefore, in the past, a waveguide 2 was used as shown in Fig. 7 without providing any particular cooling pipe.
It has been considered to cool the space by flowing a coolant from the top to the bottom or from the bottom to the top.

However, with such a configuration, although the coolant flows through the vertical flow path 25, it hardly flows through the horizontal flow path 26. Therefore, although it is possible to effectively cool the vertical side walls 24A of the waveguide 24, there is a problem that the horizontal side walls 24B are not effectively cooled. - There has been concern about the generation of thermal stress in T-reaction type fusion devices.

[Object of the Invention] The present invention has been made based on the above points, and its purpose is to effectively cool the horizontal side walls of the waveguide and to thermally reduce thermal stress. An object of the present invention is to provide a low-frequency hybrid wave heating device coupling system capable of improving soundness.

[Summary of the Invention] That is, the low-frequency hybrid wave heating device coupling system according to the present invention includes a plurality of waveguides that penetrate the torus structure of the fusion device and face the plasma, and are arranged in a grid pattern. In a low-frequency hybrid wave heating device coupling system comprising a tube bundle,
The present invention is characterized in that a flow path forming plate is installed between the waveguide and a waveguide located obliquely above the waveguide.

In other words, whereas conventionally, most of the coolant flowed only in the vertical direction and not in the horizontal direction, a flow path forming plate is used between the waveguide and the waveguide diagonally above the waveguide. By installing it, the coolant can be forced to flow horizontally as well.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Figure 1 is a diagram of a part of the coupling system of L)-IRF++4 viewed from two plasma directions, and the reference numeral 1 in the figure
23 is a waveguide bundle, and 124 is a waveguide. The waveguides 124 are arranged in a grid pattern with gaps between them.

Further, a flow path forming plate 131 is installed between a corner of the waveguide 124 at an arbitrary position and a corner of the waveguide 124 located diagonally above. This will be explained in more detail. That is, in the cross section of the waveguide bundle 123 in FIG.
Arbitrary waveguides 124 are specified in columns in the vertical direction. In this case, the corner a on the (k+'l) row side of the waveguide 124 in row m and the corner a on the (m+1) column side, and the corner a on the (k+1) row and (m+1) column side of the waveguide 124 A flow path forming plate 131 is provided between the corner portion on the m-row side. On the other hand, the above (k+1) row (m+1
) column of the waveguide 124 on the (k+2) row side and the m column side, and the corner a' of the waveguide 124 in the (k+2) row and m column
1) A flow path forming plate 131 is installed between the row side and the corner b' of the (m+ 1 ) column side. With this configuration, the coolant is actively circulated not only in the vertical flow path 125 but also in the horizontal flow path 126 as shown by the arrow in the figure, thereby effectively cooling the vertical side wall 124A and the horizontal side wall 124B. I will try.

The flow path forming plate 131 has a structure as shown in FIG. 2, and fitting recesses 131A formed at both ends are fitted into the corners a, b and a', b' of the waveguide 124. Let it be fixed. Further, the flow path forming plate 131 is made of a material with good thermal conductivity (for example, copper or aluminum).

Further, a distribution orifice 142 is installed between the jacket 141 housing the waveguide bundle 123 and the waveguide 124, as shown in FIG. That is, the jacket 14
In the flow path between 1 and the waveguide 124, the coolant is repeatedly merged and divided, and in this case, by installing the distribution orifice 142, effective flow distribution can be achieved. Since the flow path forming plate 131 is installed, the coolant, which conventionally mostly flowed in the vertical direction, can be forced to flow horizontally, thereby allowing the waveguide 124 to be arranged horizontally. side wall 124
B can be effectively cooled. In particular, since the flow path forming plate 131 is made of a material with good thermal conductivity, the cooling effect is greatly improved. In this way, not only the vertical side wall 124A of the waveguide 124 but also the horizontal side wall 124B can be effectively cooled, so in the case of a D-T reaction type fusion device with a relatively high heat load. Even under these conditions, the occurrence of thermal stress is sufficiently alleviated, making it possible to effectively maintain thermal integrity. In addition, since the flow path forming plate 131 is of a fitting type, the waveguide bundle 1
23 is also easy to assemble.

Note that the present invention is not limited to the embodiments described above, and various shapes, numbers, and mounting positions of the flow path forming plates can be considered.

[Effects of the Invention] As detailed above, the low-frequency hybrid wave heating device coupling system according to the present invention can effectively cool not only the vertical side walls of the waveguide but also the horizontal side walls. This makes it possible to effectively alleviate the occurrence of thermal stress and maintain thermal integrity.

[Brief explanation of drawings]

Figures 1 to 3 are diagrams showing one embodiment of the present invention.
The figure is a partial sectional view of the low range hybrid wave heating device coupling system, Figure 2 is a perspective view of the flow path forming plate, and Figure 3 is a part of the low range hybrid wave heating device coupling system showing the installation state of the distribution orifice. Cross section, 4th
Figures 7 to 7 are diagrams used to explain the conventional example. Figure 4 is a vertical cross-sectional view showing the schematic configuration of a nuclear fusion device, Figure 5 is a partial perspective view of a low-frequency hybrid wave heating device, and Figure 6 is a partial perspective view of a low-frequency hybrid wave heating device. The figure is a partial perspective view of a low-frequency hybrid wave heating device coupling system, and FIG. 7 is a sectional view showing a state in which a coolant flows between waveguides. 1...Vacuum container, 2...Plasma, Tona--Gei Kaede... ・゛°g±A
'kA 123...Representative for license applicant
Patent Attorney Takehiko Suzue Figure 1 Figure 2 31A Figure 3 Cause 5 Figure 6

Claims (2)

[Claims] (1) In a low-frequency hybrid wave heating device coupling system comprising a waveguide bundle in which a plurality of waveguides are passed through the torus structure of the fusion device to face the plasma and arranged in a grid pattern, the above-mentioned 1. A coupling system for a low-frequency hybrid wave heating device, characterized in that a flow path forming plate is installed between a waveguide and a waveguide located obliquely above the waveguide. (2) When specifying an arbitrary waveguide by taking a cross section of the waveguide bundle and specifying the horizontal direction as a row and the vertical direction as a column in the cross section, (k+1) of the waveguide in an arbitrary k row and m column On the row side (m+
1) A flow path forming plate is provided between the corner on the column side and the corner on the k row side and m column side of the waveguide in the (k+1) row and (m+1) column, and The corner part on the (k+2) row side of the waveguide in column m+1) on the m column side, and the corner on the (k+1) row side of the waveguide in row (k+2) row and m column,
2. The low-frequency hybrid wave heating device coupling system according to claim 1, wherein a flow path forming plate is installed between the corner portion on the side of row m+1).