JPS5954199A - High speed shutter unit - 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 high-speed shutter device used in a neutral particle injection device for secondary heating of plasma confined in a nuclear fusion device.

[Technical background of the invention]

FIG. 1 is a schematic configuration diagram of a neutral particle injection device having a high-speed shutter device, in which 101 is an ion source, 102 is a neutralization cell, 103 is a deflection magnet, 104 is a beam damper, and 10
5 is a neutral gas introduction pipe, 106 is a vacuum container equipped with nuclear fusion,
107 is a plasma, and 108 is a high-speed neutral particle beam.

The neutral particle injection device that injects the high speed neutral particle beam 10B into the plasma 107 generated in the nuclear fusion device 106 having such a configuration for secondary heating has an ion source 101 that generates plasma and accelerates its ions. , a neutralization cell 102 that maintains the linear density of the gas that is the target of the fast ions at a predetermined value in order to smoothly convert these accelerated fast ions into fast neutrons through charge exchange; It consists of a gas introduction pipe 105 that introduces gas into the sexualization cell 102, a device that guides high-speed neutral particles to the plasma 107 without loss, a deflection magnet 103, a beam detector +1 o 4, a high-speed shutter device 100, etc. .

By the way, in order to maintain the linear density of the target gas at a predetermined value in the neutralization cell 102, it is necessary to introduce a large amount of gas. Although the reaction of the particles progresses, the high-speed ions are not easily converted into 100 high-speed neutral particles, and the neutralization cell 10
Most of the neutral gas introduced into the fusion device 106 remains as a neutral room temperature gas L, and when this neutral room temperature gas flows into the fusion device 106, the temperature of the plasma 107 drops significantly, causing neutral particle incidence. The plasma secondary heating function of the device is impaired.

In order to minimize the amount of residual neutral room temperature gas that causes such a drop in plasma temperature flowing into the plasma 107 in the fusion device 106, it is necessary to It is necessary to instantaneously open the flow path through which this passes, and to instantly shut off the passage when the injection of the high-speed neutral particle beam 10B ends. The high-speed shutter device 100 that performs this function is: (1) accurate and fast shutter operation, (2) small time delay required for operation, and (2) high-speed operation that can withstand excessive inertia at the beginning and end of operation and has a long repeated life. (2) The conductance must be sufficiently small to block neutral room temperature gas, and (2) When the shutter is opened, the flow path must be reliably opened to allow the high-speed neutral particle beam to pass through.

There is a conventional high-speed shutter device ioo constructed as shown in FIG. In the figure, 1 is a vacuum container with a flow path for high-speed neutral particles, 1a is the opening of the vacuum container 1, and 2 is the opening 1
The shirt flap plate that opens and closes a, 3 drives the shirt flap plate 2 @ 4
5 is an extensible bellows for vacuum-sealing the drive shaft 4 and the vacuum container 1, 6 is a frame for fixing the piston device 3, and 7 and 8 are compressors connected to the piston device. This is a fluid supply/discharge pipe.

By the way, the opening portion 1a is provided with a plurality of ion sources 101.
It needs to be large enough to pass the high speed neutral particle beam 10B from.

Therefore, the conventional high-speed shutter device 10.0 has the following drawbacks. , ■ Since the opening 1a is large, no force is applied unless the stroke of the shirt cover plate 2 is made large. Therefore, by quickly opening and closing the shutter plate 2, the room-temperature neutral gas is transferred to the vacuum vessel 106 of the fusion device.
- In order to prevent the inflow of , it is necessary to increase the driving speed. Therefore, the inertia when the shirt shirt plate 2 is opened or closed becomes excessive, and there is a risk that the bellows 5 will be destroyed by the inertia.

- Since the opening 1a is large, the shirt cover plate 2 becomes large and heavy. Therefore, the driving force required for the piston device 3 becomes large in order to quickly open and close the shirt flap plate 2. However, since the piston device 3 operates with compressed gas, there is a large delay in operation and a large impact force upon stopping, resulting in a short cycle life.

In addition, not all of the ion sources 101, which are provided in plural numbers and related to high-speed neutral particles passing through the opening 1a, are always activated. However, the opening 1a is connected to a plurality of ion sources 101.
It needs to be large enough to pass all the fast neutral particle beams 108 through it. For this reason, the conventional high-speed shuttering device 100 has the following drawbacks. Since the vacuum vessel 1 is exposed to the fusion device 106 using the opening 1a of the same size as when all the ion sources 1θ1 are operated, unnecessary room temperature neutral gas is not allowed to flow into the plasma 107. I will let you do it.

For this reason, the effect of secondary heating cannot be sufficiently obtained.

Therefore, it is conceivable to configure the high-speed shutter device 100 as shown in FIG. 3. In FIG. 3, parts having the same functions as those in FIG. 2 are designated by the same reference numerals, and their explanations will be omitted. 10 is a pin that pivotally connects the shirt flap plate 2; 9 is a support that holds the pin 10 to the vacuum container 1; 11 is a lever fixed to the shirt flap plate 2; 12 is driven by a pin 13 to the lever 11; and connected to @4 by a pin 14. It's a link. The shutter device 100 configured in this manner drives the pendulum motion of the shutter plate 2 by converting the short lever 11 into a linear motion of the drive shaft 4 using the link 12. Therefore, since the stroke of the drive shaft 4 does not increase even if the opening 1a becomes larger, there is an advantage that the vertical drive movement of the drive shaft 4 can be small. However, this case also has serious drawbacks as described below.

■ When the shutter device 10θ is configured as shown in Fig. 3,
As the opening 1a becomes larger, the distance from the pin 10 to the center of gravity of the shutter plate 20, that is, the center of the camera movement increases. Then, since the rotational moment when making a pendulum movement is proportional to the square of the radius of rotation, the driving force required for the piston device 3 to make a radical movement of the shirt plate 2 via the drive shaft 4 becomes significantly large. . Therefore, since the piston device 3 operates with compressed gas, there is a large delay in operation and a large impact force upon stopping, resulting in a short cycle life.

(2) When the opening 1a becomes larger, the size of the shirt flap plate 2 becomes larger, so that when it is flipped up by the pendulum movement and brought into the open state, the required gas space becomes larger. For this reason, the entire shutter device occupies a large space, and the neutral particle injection device must be installed in a narrow space between plasma holding coils, plasma diagnostic equipment, etc., making it virtually difficult to install. become.

In addition, the above-mentioned drawback (2) is also present as in the case of the structure shown in FIG.

As described above, the conventional high-speed shutter device 100 has a long time delay required for the operation of the shutter plate 2, and has a short lifespan. Furthermore, it is impossible to quickly expose the neutral particle injection device to the nuclear fusion device when the fast neutral particle beam 108 is incident, and even at the time of exposure, the fast neutral particle beam 108 is exposed through the opening 1a as small as possible. It is impossible to prevent unnecessary room-temperature gases from entering the fusion device. Therefore, it has been difficult to sufficiently produce the effect of secondary heating.

[Purpose of the invention]

The present invention has been made to eliminate the above-mentioned drawbacks, and has the following features: shutter operation is accurate and fast, time delay required for shutter operation is sufficiently small, repeat life is long, and
It is an object of the present invention to provide a high-speed shutter device that allows a high-speed neutral particle beam to enter through a minimum aperture.

[Summary of the invention]

In order to eliminate the above-mentioned drawbacks, the present invention divides the shirt shirt plate into a plurality of pieces corresponding to the particle beam passage area, and each of the divided shirt shirt plates is driven to open and close independently.

[Embodiments of the invention]

The present invention will be explained below with reference to the drawings.

FIG. 4 shows a first embodiment of the present invention. In the figure, parts having the same functions as those in FIG. 2 are given the same reference numerals, and their explanations will be omitted. That is, covering the opening 1a with a shatter board is the same as the conventional one, but the shatter board is divided into small shatter boards 2a and 2b, each having a smaller cross-sectional area than the cross-sectional area of the opening 1a. 2a and 2b are 10
- Each of the shutter plates 2a and 2b is provided with a shutter drive device so as to be able to be opened and closed independently in the opening 18. In this shutter drive device, when a high-speed neutral particle beam is incident using some of the ion sources among the plurality of ion sources, one of the corresponding shutter plates 2g, ,
2b is configured to open and close.

Next, the operation of the apparatus configured as above will be explained. A plurality of ion sources provided in the neutral particle injection device may each individually inject high-speed neutral particles. At this time, the high-speed neutral particle beam passes through a portion of the cross-sectional area of the aperture a.

FIG. 5 shows the positional relationship when the high-speed neutral particle beam passes through the cross-sectional area of the opening 1a shown in FIG. Here, 108gFi is a region through which fast neutral particles generated from one ion source pass, and 108b is a region through which fast neutral particles generated from another ion source pass.

According to the present invention, only the fast neutral particle beam 1081L is incident independently, and the fast neutral particle beam 108b is incident Lfi.
When necessary, it is possible to open and close only the shutter plate 2a and keep the shutter 2b closed. In this case, the conductance between the fusion device 106 and the vacuum vessel 1 shown in FIG. becomes a little. Since the opening/closing stroke of the shutter plate 2a12b becomes smaller, the time required for opening and closing becomes shorter, and the inflow of room temperature neutral gas before and after the incidence of the high speed neutral particle beam 108a is also reduced. Trench shirt board 2 a
Since the weight of g 2 b is also small, the opening/closing speed increases, and this also makes it possible to reduce the inflow of room temperature neutral gas. FIG. 6 shows the amount of inflow of room temperature neutral gas per unit time into the nuclear fusion device 106 when only the high-speed neutral particle beam 108a is incident, in the conventional case (curve A in the figure) and in the present invention. (The curve of the mouth in the figure) is compared.

Furthermore, in the present invention, compared to the conventional art, it is possible to make the opening/closing stroke smaller, and the shutter plate 2a,
It became possible to reduce the weight of 2b, so 1. It is very possible to reduce the load on the piston 3 and bellows 5 in Fig. 4 of the drive device. As a result, the shutter plates 2a, 2
The cycle life of opening and closing of b is long, and both reliability and certainty are sufficiently high.

FIG. 7 shows a second embodiment of the present invention, in which the opening 1
A is configured to be opened and closed by shirt flap plates 2 a , 2 b + 2 c and 2 d, and each of the shirt flap plates 2 a to 2 d is provided with an independent drive device as in the previous embodiment. In a neutral particle injection device in which a large number of high-speed neutral particle beams generated from an ion source are made to pass through the aperture 1a and enter the nuclear fusion device, this configuration is particularly advantageous when some of the beams are made to be made incident.

FIG. 8 shows a third embodiment of the present invention, which has the same configuration as FIG. 7, but includes a plurality of shutters 2a and 2b.
, 2c and 2d are the openings 13- arranged in correspondence with the opening 1a and the passage area of the plurality of high-speed neutral particle beams passing through the opening 1a.

FIG. 9 shows a fourth embodiment of the present invention, in which the opening 1
A is opened and closed by the shutter plates 2a and 2b in the same way as in FIG. 4, but the shutter plate 2a.

The opening and closing operations of the openings 2b are structured so that they each perform independent pendulum movements.

FIG. 10 shows a fifth embodiment of the present invention, in which the opening 1a is opened and closed by moving the shirt shirt plates 2a and 2b independently on the movement axes 4a and 4b of each layer.
It is the same as the case shown in the figure, but the direction of the camera movement is changed to the shirt flap plate 2a.

In 2b, the direction is opposite. Shaft plate 2a when the opening 1a is used with pendulum movement depending on the surrounding situation of the installation location of the neutral particle injection device.
This is effective when the space of 2d is limited and it is not possible to move the shirt flap plates 2a and 2b to the same side.

Furthermore, in the embodiments shown in FIGS. 9 and 10, the drive shafts 4a and 5a of the shaker plates 2a and 2b are not necessarily required to move vertically. Similarly, the shirt top plates 2a and 2b do not necessarily have to move vertically to the left or right to open and close the opening 1a. That is,
For example, the shirt top plates 2a and 2b may each have a structure in which they are caused to swing upwardly or downwardly from the horizontal direction by drive shafts that move horizontally.

Further, in the embodiments shown in FIGS. 7 to 10, the sizes of the shirt flap plates 2th and 2b may not be the same. That is,
When the plurality of high-speed neutral particle beams passing through the aperture 1a have different cross-sectional areas, the shirt plates 2a and 2bll-j may be divided into correspondingly different sizes.

Furthermore, in the embodiments shown in FIGS. 7 to 10, the driving method for the shutter plates 2a and 2b is explained in such a case that both of them are driven by linear motion or both of them are carried out by a ripple motion. Some of these may be driven by linear motion and some by pendulum motion.

Furthermore, in the embodiments shown in FIGS. 7 to 10, the opening 1
Although the case has been explained in which the effective opening/closing cross-sectional area of one small shirt plate completely encompasses the passage area of a plurality of high-speed neutral particle beams passing through a, the passage area includes a plurality of small shirt plates. It may be configured such that the effective opening/closing cross-sectional area includes a combination of the following. This is effective when the passage area of a single high-speed neutral particle beam is particularly wide.

On the other hand, it may be configured such that the effective opening/closing cross-sectional area of one small shirt plate completely encompasses the passage area of a plurality of high-speed neutral particle beams. This is possible when multiple high-speed neutral particle beams are focused at the high-speed shutter and the effective passage area becomes narrow, or when the shutter drive device has enough leeway to drive a relatively large small shutter plate. This is effective when possible.

〔Effect of the invention〕

As described above, according to the present invention, the shirt shirt plate is divided into a plurality of pieces corresponding to the passage areas of the particle beam and opened and closed, so that the following effects can be obtained.

■ When injecting a high-speed neutral particle beam using a portion of multiple ion sources, it is possible to open and close only the shirt plate corresponding to the area through which this beam passes, so that room temperature neutral gas This makes it possible to significantly reduce the amount of energy flowing into the fusion device.

■ It is possible to reduce the stroke of opening and closing the shutter, and it is also possible to reduce the weight of the shutter, so it is possible to reduce the load on the drive part of the shutter plate, and as a result, it is possible to reduce the load on the drive part of the shutter plate. It is possible to have a long repeat life, and to have sufficiently high reliability and reliability.

Therefore, according to the present invention, it is possible to provide a high-speed shutter device that improves the secondary heating performance of the neutral particle injection device.

17-

[Brief explanation of the drawing]

1M is a vertical cross-sectional view showing a schematic configuration of a neutral particle injection device having a high-speed shutter device, FIG. 2 is a vertical cross-sectional view showing an example of a conventional high-speed shutter device, and FIG. 3 is a vertical cross-sectional view showing an example of a conventional high-speed shutter device. FIG. 4 is a vertical cross-sectional view showing the first embodiment of the high-speed shutter device according to the present invention, and FIG. 5 shows the effective opening/closing cross-sectional area of the small shutter plate at the opening shown in FIG. FIG. 6 is a longitudinal cross-sectional view illustrating the positional relationship between the passage area of the high-speed neutral particle beam and the high-speed shutter device of the present invention. The graphs and FIGS. 7 to 10 are longitudinal sectional views showing second to fifth embodiments of the high-speed shutter device according to the present invention, respectively. DESCRIPTION OF SYMBOLS 1...Vacuum container, 1a...Opening part, 2...Shutter &, 2a...Shutter plate, 2b...Shutter plate, 2c...Shutter plate, 2d...Shutter plate, 3.
... Piston device, 4... Drive shaft, 5... Bellows, 6... Frame, 7.8... Supply, discharge pipe, 9...
Bottle support plate, 18- 10...gin, 1 knot/N % 12...
- Link, 13.14... Pin, 1θ0... High speed shutter device, 101... Ion source, 102... Neutralization cell, 103... Deflection magnet, 104... Beam Dan J'? , 105...neutral gas introduction pipe, 106...
Vacuum vessel of nuclear fusion device, 107...Plasma, 108
...Fast neutral particle beam, 108a...Aperture 1a
A portion occupied by the passage area of the fast neutral particle beam within the cross-sectional area of 108b... A portion occupied by the passage area of the fast neutral particle beam within the cross-sectional area of the opening 1&. Applicant's Representative Patent Attorney Takehiko Suzue 19- Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 1F Figure 10 Figure 2

Claims (1)

[Scope of Claims] (1) A shutter device having a shutter plate that opens and closes an opening through which at least one particle beam passes,
The configuration of the shirt shirt plate is such that one effective opening/closing cross-sectional area is smaller than the entire effective cross-sectional area of the opening, and one or more combinations of at least one of the particle beams
A high-speed shutter device comprising a combination of a plurality of small shutter plates each containing a book passage area, and opening and closing of the opening is performed by independently driving each of the plurality of shutter plates to open and close. . (2. If the shape of the opening described in claim 1 is relatively long in length and relatively narrow in width, the shirt flap plate is constructed by arranging a plurality of small shirt flap plates in the length direction. A high-speed shutter device characterized in that the shutter plate is opened and closed by reciprocating movement in the width direction. (3) The shape of the opening recited in claim 1 is relatively long in length and relatively wide in width. In a narrow case, a high-speed shutter device is characterized in that the shutter plate is constructed by arranging a plurality of small shutter plates in the longitudinal direction, and the opening and closing movement of the small shutter plates is performed by reciprocating in the longitudinal direction. (4) A high-speed shutter device according to claim 1, wherein at least one opening/closing movement of the small shutter plate is performed by a pendulum movement.