JPS58138000A - Charged particle accelerator - 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] The present invention relates to a charged particle accelerator.

For example, when using a charged particle accelerator C (hereinafter referred to as accelerator) for high energy applications that discharge so-called IMV or higher, also for so-called low energy applications that discharge less than jMV, the acceleration electrodes provided in the acceleration tube are partially short-circuited. things will be done. That is, as shown in FIG. 1, the feeding resistor 6 that applies a potential to the accelerating electrode 2 provided in the accelerating tube 1 is appropriately short-circuited to the short-circuiting mechanism 4, and the accelerating electrode immediately below the short-circuit point P is connected to the short-circuiting mechanism 4. Short circuit all at once. By doing this, a. *The total potential from the accelerating electrode 2 on the upper stage to the short circuit point P becomes the desired accelerating voltage value, and the charged particles B drawn out from the filament 5 are applied to the desired voltage. I'm pressing K to accelerate.

In addition, 6 is a convergence coil installed at the bottom of the accelerating tube 1,
This is to suppress the spread of charged particles B in the radial direction of the acceleration tube 10. Reference numeral 7 denotes a scanning section, which is provided with a scanning coil (not shown), and scans every 1,1,000 Bt charged in the X-axis and Y-axis. 8 is a high voltage single current power supply.

By the way, the normal accelerating tube 1 is K as shown in No. 2-.

It consists of an insulating dump 11 and a disk-shaped O accelerating electrode 2 having an O hole 2' in the center through which the 1ij electric particles B pass, which are stacked alternately in a plurality of stages. And for high-energy 04h0, the number of stacked Ml is large, for example, in the ZMV class, it can be several dozen stages, and in the AMV class, it can be more than 100 kills. Therefore, from the viewpoint of construction and assembly, these high-energy products are divided into 1 t-2 or more acceleration tubes, and then joined together to form one acceleration tube 1.
We are trying to form a 9 in FIG. 1 is the ζ0 junction.

In the accelerator configured as described above,
Although a converging coil 6 is provided at the bottom of the accelerating tube 1, it is difficult to completely suppress the spread of charged particles B. Therefore, as shown in FIG. The diameter of the hole 2' must be increased toward the bottom. Further, depending on the case, the diameter of the accelerating type 1 and 2 itself needs to be increased toward the lower stage. As a result, there are problems in that the accelerator becomes larger and standardization of parts is prevented. Furthermore, the extraction conditions for the charged particles B are also restricted, making it difficult to obtain stable beam characteristics.

The present invention was proposed to solve the above-mentioned problems, and will be described in detail below according to an embodiment shown in FIG.

In FIG. 3, the symbol "-" with the same reference numeral as in FIG. 1 indicates a handmade item or an imitation item.

A feature of the present invention is that a plurality of acceleration tube sections are T-joined to form one acceleration tube, and a convergence coil is disposed at the joint. That is, 10 is an acceleration tube, which is formed by connecting a plurality of acceleration tube parts 11, 12, and flanges in series, and 16 is a joint portion thereof. Reference numeral 14 denotes a converging coil that is applied to this joint 15. Electric power is supplied to the coil 14 via the short circuit mechanism 4. That is, the short circuit mechanism 4 is composed of a short circuit contact 41 that is moved up and down as appropriate and a conductive part 42, and the power from the DC current #15 is converged by a converging coil using a daple or the like arranged along the conductive part 42. 14. In this way, there is no need to provide a separate conductive path, and the electrical connection and configuration are simplified.

According to this invention, even if the acceleration tube 10 is a tortoise that connects a plurality of acceleration tube sections 11 and 12, the joint portion 16
Since the converging coil 14 is provided, the spread of the charged particles B from the filament 5 is sufficiently suppressed. Therefore, the size of the hole 2' rising to the accelerating electrode 2 is also Il! Therefore, the size of the accelerating electrode 2 does not need to be increased as it goes downward. Therefore, it is possible to prevent this type of accelerator from increasing in size and to standardize parts. Further, the conditions for extracting the charged particles B are no longer restricted, and stable beam characteristics can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing a conventional accelerator, and Fig. 2b! J
2 is a sectional view showing, in particular, the configuration of the accelerator tube in FIG. 1. FIG. FIG. 5 shows a frame structure #l showing an example of an accelerator according to the present invention.
It is facing L. 10...Acceleration tube 11.12...Acceleration tube section 16...-Joint section 14, --- Convergence coil patent developer Nisshinpachi Voltage Co., Ltd.

Claims (1)

[Claims] A charged particle accelerator in which a plurality of accelerating tube sections are connected in series to form one accelerating tube, and a converging coil is placed at this joint.