JPS63310103A - Method for imparting grade of magnetic field intensity by using superconductivity - Google Patents

Abstract

PURPOSE:To impart a grade of magnetic field intensity by a method wherein, after a first wire material composed of a superconducting material has been formed in a figure-shape of 8, two small and large interlinked regions are formed inside a magnetic field and in the same manner two small and large interlinked regions are formed by a second wire material in the large interlinked region. CONSTITUTION:Two 8-shaped small and large interlinked regions 16a, 16b formed by a second wire material 16 composed of a superconducting material are formed inside a large interlinked region 15a formed by a first wire material 15; the small interlinked region 16b is arranged in a small interlinked region 15b formed by the first wire material 15. The magnetic field intensity near the large interlinked region 16a formed by the second wire material 16 is different from that near the small interlinked region 16b formed by the second wire material 16. Accordingly, the magnetic field intensity is decreased from the side of the small interlinked region 15b formed by the first wire material 15 toward the side of the large interlinked region 16a formed by the second wire material 16. By this setup, a large grade of the magnetic field intensity can be caused.

Description

TECHNICAL FIELD The present invention relates to a novel method of gradient magnetic field strength using fi conduction, for example in synchrotron orbital radiation.
The present invention relates to a method of creating a gradient in the strength of a magnetic field using superconductivity, which can be suitably applied to particle accelerators such as cation (abbreviated as 5OR) and betatrons.

Background technology A typical prior art is shown in FIG.

An air gap 2 is formed between the end surfaces 1a and lb of the core 1 made of pure iron or the like. A coil 3 is wound around this core 1, and this coil 3 is excited by a power source 4.

In this way, a normal conducting electromagnet is constructed. By changing the distance between the end surfaces 1a and lb of the core 1, for example, in the left-right direction in FIG. 12, it is possible to create a gradient in the strength of the magnetic field.

Points to be solved by the invention In such prior art, since F1 reaches magnetic saturation at about 2 Tesla, the strength of the magnetic field cannot be improved, and the strength of the magnetic field cannot be improved. It is not possible to increase the gradient.

The purpose of the present invention is to improve the strength of the magnetic field,
It is an object of the present invention to provide a method of creating a gradient in the strength of a magnetic field using superconductivity that allows the gradient of the strength of the magnetic field to be increased.

Means for Resolving Interflexion Points The present invention provides a means for resolving interflexion points in a magnetic field. A first wire made of a conductive material is formed into a figure 8 shape to form two large and small interlinkage regions, and within the larger interlinkage region of the two interlinkage regions,
This is a method of creating a gradient in the strength of a magnetic field using Ifi conduction, which is characterized by forming a second wire made of a superconducting material in a figure 8 shape to form two large and small interlinking regions.

A preferred embodiment is characterized in that, of the two large and small interlinkage regions formed by the second wire, the smaller interlinkage region is arranged on the side of the smaller interlinkage region II formed by the first wire.

Further, a preferred embodiment is characterized in that a plate-like body made of a superconducting material is disposed within the larger interlinkage region of the tjS2 wire.

Effect According to the present invention, I! i The first wire made of conductive material is 8
It is formed in the shape of a square to form two large and small interlinking regions.

In these two interlinkage regions, currents flow in directions that block the passage of magnetic flux.

Therefore, a current having a value equal to the difference between the currents flowing in each of the large and small interlinkage regions flows through the first wire.

Therefore, the strength of each magnetic field in the vicinity of the larger linkage region and the smaller linkage region is different. That is, in the larger interlinkage region, a magnetic flux smaller than the applied magnetic flux density passes through. In the smaller linkage region, a current larger than the value of the current that blocks the passage of the magnetic flux applied to the smaller linkage region flows, and this flowing current is in a direction that enhances the applied magnetic flux. Therefore, in the smaller interlinkage regions, the magnetic field strength is greater (and in the larger interlinkage regions, the magnetic field strength is smaller, thus creating a gradient in the magnetic field strength.

Within the larger interlinkage region of the first wire, two large and small chain regions in a figure 8 shape formed by a second wire made of a superconducting material are formed. Among the interlinkage ilt regions, the smaller interlinkage region is arranged on the side of the smaller interlinkage region formed by the first wire. The strength of the magnetic field near the larger interlinkage region caused by the second wire and the smaller interlinkage region caused by the second wire are different.

Therefore, the strength of the magnetic field decreases from the smaller interlinkage region of the first wire to the larger interlinkage region of the second wire. In this way, it is possible to create a large gradient in the strength of the magnetic field.

Since the first and tlS2 wires are made of superconductivity, it is possible to form a magnetic field of a maximum of about 2 Tesla or more, which has been considered difficult in the past, and to create a gradient in the strength of the magnetic field. The magnetic field can be created by a normally conducting coil or a superconducting coil.

Example FIG. 1 is a perspective view of one embodiment of the present invention.

Annular Ili arranged at intervals above and below in Figure 1
A magnetic field having a magnetic flux density B0 is formed between the conductive coils 6,7. A superconducting coil 8 according to the invention is placed within this magnetic field. Superconducting coil that forms a magnetic field 6.7
is energized by a DC power source.

In order to explain the principle of the superconducting coil 8, with reference to FIG.
, the magnetic flux density passing through the linkage region 10 formed by the coil 9 is B = B,
-(1), and the current I flowing through the conductor 9
0 is ■. =0...(2).

Referring to the tIS3 diagram, when a leap loop is formed using a superconducting wire 11 in a magnetic field with a magnetic flux density B0, the magnetic flux B passing through the interlinkage region 12 formed by the wire 11 is as follows: B=0... (3), and the current I0 flowing through the wire 11 is 1. =L-B,
...(4), the #Q material 11 is horizontal, RU, and has a linkage area 12 perpendicular to the direction of the magnetic field, and this chain 2 viewing area 12 is square or rectangular. It becomes.

In FIG. 3, the magnetic flux B passing through the interlinkage region 12 is as shown by the fifth equation, and therefore the third equation described above holds true.

B = (applied magnetic field) - (magnetic field due to current I0) = 0
(5) As shown in FIG. 4, interlinkage regions 12a and 12b are individually formed by wire rods 11a and 11b made of Mi conductivity, and these wire rods 11a and jib are placed in a magnetic field with a magnetic flux density B0. Assume that the The side of Chain Link II Castle 12a and 12b is La,
Lb, and their vertical U is equal.

At this time, the currents Ia, I flowing through the wires 11a and llb
b is expressed by the sixth equation and C/seventh equation.

Ia=La-B,
=-(6)Ib=Lb-8,...(7) Next, as shown in Figure tj45, the wire 13 made of superconducting material is formed into a figure 8 shape, and two large and small interlinkage f1 regions are formed. 13a and 13b are formed. As mentioned above, this wire 13 has a figure 8 shape and is twisted at the part indicated by reference numeral 14, and the lateral L1 at the twisted part 14 is
is assumed to be negligible (Ll”vO).

The total horizontal length of the linkage regions 13a and 13b is L,
The length is U.

If the sides of the linkage regions 13m and 13b are La and Lb, L
a+LL+=L=18) The current flowing through the portion of the wire 13 in the interlinkage region 13a is Ial
The current flowing through the wire 13 in the interlinkage region 13b is Ibl, the current flowing when the interlinkage region 13m is formed of a leap-loop superconducting wire is Im, and the interlinkage region 13b is formed of an m-loop superconducting wire. Does it flow when formed? When the 4th current is Ib, the 9th current in the magnetic flux density B0
Equation and Equation 10 hold true.

Ial= -Ib1 =Ia Ib = CL a L b) B O- (9) Bal=-
Bbl Therefore, the magnetic flux density Bal directly below or in the vicinity of the interlinkage region 13a changes depending on the lateral La as shown in diagram #S6, and similarly, the magnetic flux density Bbl immediately below or in the vicinity of the chain 21i region 13b is: It changes depending on the lateral Lm.

In the linkage regions 13m and 13b, it is understood that by setting La≠Lb (11), the densities of the magnetic fluxes passing through the linkage regions kl13a and 13b are different from each other.

FIG. 7 is a plan view of the superconducting coil 8 described in connection with FIG. 1. This i-conducting film 8 includes a first wire 15 and
Including the PIS2 wire rod 1G, the third wire village 17, and the plate-shaped body 18, these wire rods 15, 16, 17 and the plate-shaped body 18,
It is made of superconducting material and placed in a magnetic field with a magnetic flux density B0. - the first wire 15 is formed in a figure 8 shape;
It forms two large and small interlinkage regions ISa, 15b, and is twisted at a portion indicated by reference numeral 19. Linkage region 15a, 1
5b, the lateral lengths in the X direction perpendicular to the magnetic flux B0 are determined to be large and small, and the widths in the y direction are the same value.

The current flowing in the interlinkage region 15a of the first wire 15 and the density of the magnetic flux immediately below or in the vicinity of the interlinkage region 15m correspond to the current Ial and the magnetic flux Bal described in relation to FIG. 5, respectively. . The interlinkage area ISa is larger than the interlinkage area 15&, and the current flowing through the first wire 15 is
The current Ial in equation 9 described in connection with FIG. 5 above
Correspondingly, the lower magnetic flux density of the interlinkage region 15a in FIG. 7 corresponds to the magnetic flux density Bal shown in the above-mentioned equation 10.

The magnetic flux density directly below the larger interlinkage region 15& is smaller than the magnetic flux density immediately below the smaller interlinkage region 15b.

In the larger interlinkage region 15a of the first wire 15,
Two interlocking regions 16a and 16b, large and small, in which the second wire 1G is formed in a figure 8 shape are formed in the same plane. Linkage region 166 is larger than linkage region 16b. The smaller linkage region 16b is the smaller linkage region 1 of the first wire 15.
It is placed on the 5b side (the dominant one in FIG. 7). The magnetic flux density directly under the larger interlinkage region 16a is the same as that of the smaller chain 2 region 16.
It is smaller than the magnetic flux density directly under b. In this way the seventh
It is understood that the magnetic flux density directly under the superconducting film 8 decreases as it moves toward the left side of the figure.

In the larger interlinking region IGa of the second wire 1G, interlinking regions 17a and 171+ of the third wire 17 are formed in a figure 8 shape within the same plane. The linkage region 17a is larger than the linkage region 17b! The smaller interlinkage region 17b of the 143-piece wire 17 is connected to the smaller chain 2 of the second wire 16.
It is arranged in W area 1 (Sbll (right side in FIG. 7). Thus, the magnetic flux density directly below the larger interlinkage area 17a should be smaller than the magnetic flux density directly below the smaller interlinkage area 17b. Can be done.

A plate-like body 18 is arranged within the same plane within the interlinkage region 17a. Immediately below this plate-shaped body 18, the magnetic flux is zero.

Therefore, the magnetic flux density directly below the superconducting coil 8 is
As shown in 8UA, it has a slope that decreases from the right to the left in FIG. 7 and reaches 0 immediately below the plate-like body 18.

FIG. 9 is a perspective view of another embodiment of the invention.

Inside the cylindrical superconducting coil 20, there is a magnetic flux density B.

A magnetic flux is formed, and a superconducting coil 8 according to the invention is placed in this magnetic field. The magnetic flux density directly below the superconducting coil 8 has a gradient similar to the previous embodiment.

Although in the example described above three wire rods 15, 16, 17 were used, a larger number of wire rods may be used and the plate-shaped body 18 may be omitted.

Figure 10 is a plan view of a superconducting coil 8a according to still another embodiment of the present invention. With the same reference mark. What should be noted is that the larger of the two large and small interlinkage regions 16a and 16b formed in a figure 8 shape of the second wire 1G is formed within the larger interlinkage region 15 of the first wire 15. The interlinkage region 16a is arranged on the smaller chain 2 region 15b side of the first wire 15 (on the right side of the fjS10 diagram).

As described above), in the first wire 15, the magnetic flux density directly below the larger linkage region ki1sm is smaller than the magnetic flux density directly below the smaller linkage region 15b.

In addition, in the second M material 16, the smaller interlinkage region IGl
+ The magnetic flux density directly below the larger linkage region 16a is greater than the magnetic flux density directly below the larger linkage region 16a.Therefore, the magnetic flux density directly below the superconducting coil 8a is equal to the magnetic flux density directly below the larger linkage region 16m of the second wire 1G. As shown in Figure @11, the slope decreases from the right to the left in Figure 10, and increases further to the left.

In another embodiment of the present invention, a third wire is formed and arranged in a figure-eight shape within the larger interlinkage region 1a of the second wire 16, thereby producing a magnetic flux having a different gradient. It becomes possible to obtain density.

Further, by appropriately selecting the arrangement of the plurality of wires in the pond, it is possible to obtain magnetic flux densities having even different gradients.

In order to form a magnetic field with magnetic flux density B0, m74
In addition to the conducting coils 6.7; 20, normal conducting coils may be used.

Effects As described above, according to the present invention, a magnetic field with improved maximum magnetic flux density and therefore maximum magnetic field strength can be formed, and the gradient of the magnetic field strength can be increased. Therefore, it becomes possible to downsize the SOR, charged particle accelerator, and the like.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a perspective view for explaining the effect when a normal conducting wire 9 is used, and FIG. 3 is a perspective view when a superconducting wire 11 is used. 4 is a perspective view for explaining the effect when a superconducting wire llm=111] is used; FIG. 5 is a perspective view for explaining the present invention in detail. Figure 6 shows the linkage region 13at1 in Figure 5.
A graph showing the magnetic flux density directly under 3b, Figure 7 is f
FIG. 8 is a graph showing the magnetic flux density directly under the superconducting coil 8, FIG. 9 is a perspective view of an embodiment of a pond according to the present invention, and FIG. 10 is a plan view of the superconducting coil 8a. , FIG. 11 is a graph showing the magnetic flux density directly under the superconducting coil 8&, and FIG. 12 is a perspective view of the prior art. 6.7.20...Superconducting coil, 8,8a...Superconducting coil, 15...First wire, 15a=15b...
Interlinkage region, 1G/#2 wire, 16t, IG
b... Linkage area, 17... Third wire rod, 17m, 17
&... Linkage area, 18... Plate body agent Patent attorney Number of strokes Keiichi Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 7 Fig. 9 Fig. 10 Fig. 11 Fig. 5kI

Claims (3)

[Claims] (1) A first wire made of superconducting material is formed in a figure-eight shape in a magnetic field to form two large and small linkage regions, and within the larger linkage region of the two linkage regions. A method for creating a gradient in the strength of a magnetic field using superconductivity, characterized in that a second wire made of superconducting material is formed in a figure-eight shape to form two large and small interlinkage regions. (2) The smaller of the two larger and smaller interlinkage regions formed by the second wire is arranged on the side of the smaller interlinkage region formed by the first wire. A method of creating a gradient in the strength of a magnetic field using the superconductor described in item 1. (3) A plate-like body made of a superconducting material is disposed within the larger interlinkage region of the second wire, using the superconductor according to claim 1 or 2 to generate a magnetic field. How to create a gradient in strength.