JPH0795479B2 - Septum type electromagnet - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a septum type electromagnet, and more specifically, in a circular particle accelerator or the like, injection of charged particles,
The present invention relates to a septum type electromagnet used for deflecting charged particles at the time of emission.

[Conventional technology]

FIG. 3 shows a conventional septum type electromagnet disclosed in, for example, Japanese Patent Publication No. 63-57926, in which a septum coil is a coil wire conductor (1a) as a septum and a coil wire conductor as a return conductor. (1b), and each of these coil wire conductors (1a), (1b) has a wire insulation (2a), (2b), and a main insulation (earth insulation) (3a), ( 3b) is coupled to an iron core (4), and a magnetic shield (5) and a magnetic shield retainer (6) are provided on the outer periphery of the iron core (4) to hold a coil.

Further, as shown in FIG. 4, there is also one provided with a coil retainer (7) for retaining the coil (1b).

The conventional septum type electromagnet configured as described above is used for injecting or emitting charged particles into or from a circular particle accelerator, and the central orbit A of the charged particles at the time of injecting or emitting these is the equilibrium orbit of the circular particle accelerator. It is efficient to bring it as close as possible to B.

As a result, in order to bring the track A closer to the track B, the coil wire conductor (1a), the wire insulator (2a), and the main insulator (3a)
Was formed as thin as possible.

Further, in order to limit the deformation of the wire (1a) by the electromagnetic force (expansion force) F generated when the coil is energized, the magnetic shield (5) and the magnetic shield retainer (6) are welded or bolts (not shown), etc. Was attached and reinforced. Also, the fourth
In the illustrated case, the coil wire conductor (1b) is further fixed by the coil retainer (7).

[Problems to be Solved by the Invention]

Since the conventional septum electromagnet is configured as described above, the structure is complicated, while the span for coil support is long against the electromagnetic force when the coil is energized. However, there is a problem that the formed magnetic field is disturbed.

In addition, the coil vibration during pulse energization caused damage to the insulator, resulting in a decrease in insulation.

The present invention has been made to solve the above-mentioned problems, and can reliably support the electromagnetic force when the coil is energized, improve the magnetic field accuracy, and prevent the deterioration of the insulator, thereby ensuring long-term operation. The purpose is to obtain a reliable septum electromagnet for use.

[Means for Solving the Problems]

In the septum type electromagnet according to the present invention, the iron core is configured by laminating a plurality of thin plates of a magnetic material in which a fitting groove for fitting the septum and the return conductor and an opening forming a beam opening are formed. The septum coil is fixed to the iron core by fitting the septum and the return conductor into the fitting groove.

[Work]

In the present invention, since the septum of the septum coil and the return conductor are fitted in the fitting groove provided in the thin plate made of a magnetic material, it is not necessary to separately provide a coil supporting structure, and a pressing member for supporting electromagnetic force is further provided. Is not required, and the coil support structure is simplified.

〔Example〕

1 and 2 are a cross-sectional view and a perspective view, respectively, showing an embodiment of a septum type electromagnet according to the present invention. The opening (8a) and the fitting groove (8b) forming the beam opening through which the incident charged particles pass are formed by punching out a single plate, and this core plate (8)
An iron core (9) is formed by laminating a large number of sheets.

In addition, the same reference numerals as in FIG. 3 indicate the same parts,
The description is omitted.

To assemble the septum type electromagnet constructed in this way, the wire insulators (2a), (2b) and the main insulator (3a),
The coil wire conductors (1a) and (1b) are numbered so that the coil wire conductors (1a) and (1b) provided with (3b) are fitted in the fitting grooves (8b) of the core plate (8). The core plate (8) is inserted in units of several to several tens, and stacked. Then, after a predetermined number of core plates (8) are laminated, the magnetic shield plate (5) is externally attached to the coil wire conductor (1a) side of the iron core (9).
Are welded and attached to assemble the electromagnet.

According to this embodiment, since the coil wire conductors (1a) and (1b) are fitted and fixed in the fitting groove (8b) of the core plate (8), the coil wire conductor (1b) is pressed down. The coil retainer (7) is not required and the structure is simplified. Also, the electromagnetic force F acting on the coil wire conductor (1a) when the coil is energized
Does not act on the magnetic shield plate (5), the magnetic shield plate (5) is made thinner, and the magnetic shield plate retainer (6) is no longer required, and the central orbit A of the incoming and outgoing charged particles and the circular particle accelerator The thickness of the partition wall with the equilibrium orbit B can be reduced, and the efficiency of conversion from orbit A to B or B to A (incidence or emission efficiency) can be increased.

Further, the electromagnetic force F acting on the coil wire conductor (1a) when the coil is energized is directly transmitted from the fitting groove (8b) to the iron core portion (8c), and the coil wire conductor (1a) is firmly supported and deformed. It can be suppressed. As a result, coil vibration during pulse energization is also eliminated, deterioration of the wire insulator (2a) and main insulator (3a) can be prevented, and reliability is improved.

Further, by simplifying the coil support structure and improving the rigidity, the coil installation accuracy is improved, the magnetic field accuracy is improved, and the incident / exit efficiency of the septum type electromagnet is further improved.

Furthermore, the iron core (9) is formed and the septum coil is fixed at the same time, so that the assemblability is improved.

In the above embodiment, the core plate (8) has the opening (8a) formed so as to open the side of the fitting groove (8b) into which the coil wire conductor (1a) is fitted. However, the opening (8a) of the core plate (8) may be formed leaving the outside of the fitting groove (8b) into which the coil wire conductor (1a) is fitted. In this case, the core plate (8) part outside the fitting groove (8b) into which the coil wire conductor (1a) is fitted acts as a magnetic shield plate, and the core plate (8) has an iron core part (8c) and a magnetic shield part. The part will be integrally formed.

Therefore, the magnetic shield plate (5) is not required, the structure is simplified, and the partition wall between the central orbit A of the incoming / outgoing charged particles and the equilibrium orbit B of the circular particle accelerator can be made thinner. Therefore, the efficiency of conversion from orbit A to B or B to A (incidence or emission efficiency) can be improved. Further, the electromagnetic force F acting on the coil wire conductor (1a) when the coil is energized is directly transmitted from the fitting groove (8b) and the magnetic shield part to the iron core part (8c), and the coil wire conductor (1a) is firmly supported. As a result, deformation is suppressed. As a result, coil vibration during pulse energization is also eliminated, and the wire insulation (2a),
The deterioration of the main insulator (3a) can be prevented.

Further, in the above embodiment, as a thin plate of the magnetic material, using a silicon steel plate, an example of using in pulse energization,
In the case of direct-current energization, it is possible to simply use punched sheets of electromagnetic soft iron and stack them, and the same effects as those of the above-described embodiment are obtained.

〔The invention's effect〕

As described above, according to the present invention, the iron core is formed by laminating a large number of thin plates of magnetic material in which the fitting groove for fitting the septum and the return conductor and the opening forming the beam opening are formed. Since the septum coil is configured and fixed to the iron core by fitting the septum and the return conductor in the fitting groove, the coil support structure is simplified and the rigidity is improved, the coil installation accuracy is improved, and the magnetic field The accuracy is improved, the efficiency of incidence / emission can be improved, and a highly reliable septum type electromagnet can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a septum type electromagnet according to an embodiment of the present invention, and FIG. 2 is a perspective view for explaining an assembled state of the septum type electromagnet according to an embodiment of the present invention, FIG. 3 and FIG. FIG. 4 is a cross-sectional view showing a conventional septum type electromagnet. (1a) ... coil wire conductor (septum), (1b) ... coil wire conductor (return conductor), (5) ... magnetic shield plate, (8) ... core plate (magnetic thin plate), (8a) …… Opening, (8b) …… Mating groove, (8c) …… Iron core, (9) ……
Iron core. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] 1. A septum coil having a beam opening through which an incident charged particle passes and a deflection magnetic field is generated in the beam opening, a septum coil formed of a return conductor, an iron core covering the septum coil, and a charged particle. In a septum-type electromagnet having a magnetic shield plate disposed on the side of the septum on the side of the accelerator where the beam enters, the iron core constitutes a fitting groove for fitting the septum and the return conductor, and the beam opening. It is configured by laminating a plurality of magnetic thin plates each having an opening, and the septum coil is fixed to the iron core by fitting the septum and the return conductor into the fitting groove. Septum type electromagnet. 2. The thin plate of the magnetic body is formed so that the opening remains outside the fitting groove for fitting the septum, and is formed in a sectional shape in which an iron core portion and a magnetic shield portion are integrated. The septum type electromagnet according to claim 1, wherein: