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Laser ion source and heavy ion radiotherapy device

A laser ion source, laser technology, applied in treatment, ion beam tube, X-ray/γ-ray/particle irradiation therapy, etc., can solve the problems of complex structure and achieve the effect of simple structure

Active Publication Date: 2016-08-17
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the fouling prevention mechanism is arranged in the vacuum container, there is a problem that the structure becomes complicated

Method used

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  • Laser ion source and heavy ion radiotherapy device
  • Laser ion source and heavy ion radiotherapy device
  • Laser ion source and heavy ion radiotherapy device

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Experimental program
Comparison scheme
Effect test

no. 1 approach ）

[0049] figure 2 It is a schematic sectional view showing the structure of the first embodiment of the laser ion source of the present invention. image 3 yes means figure 2 An enlarged cross-sectional view of the lens mounting mechanism of .

[0050] Such as figure 2 As shown, the vacuum container 1 is made of a material that has excellent corrosion resistance and chemical resistance and emits little gas, such as stainless steel. Inside the vacuum vessel 1, an element as an ion or a target 2 containing the element is arranged. The target 2 is formed of, for example, a carbon-based plate-shaped member.

[0051] In the vacuum vessel 1, a high voltage is applied from a high-voltage power supply not shown. A positive potential is applied when generating a positive ion beam, and a negative potential is applied when generating a negative ion beam. In this embodiment, a positive high voltage is applied. An unillustrated exhaust port is formed in the vacuum vessel 1, and the...

no. 4 approach ）

[0080] Figure 7 It is an enlarged cross-sectional view showing a vacuum window and a lens mounting mechanism of a fourth embodiment of the laser ion source of the present invention.

[0081] Such as Figure 7 As shown, in this embodiment, in addition to the configuration of the above-mentioned third embodiment, the condenser lens 4 of the lens holder 12 is configured to be movable in the laser optical axis direction. Specifically, a vacuum window 15 is disposed on the vacuum side of the holder mounting member 14 . The vacuum window 15 is pressed against the O-ring 13 side by a pressure ring 12a, and fixed by fixing a fixing ring 12b with small bolts.

[0082] The movable lens holder 16 is formed in a cylindrical shape and provided concentrically with the holder mounting member 14 . In the present embodiment, a female thread is engraved on the inner peripheral surface of the holder mounting member 14 , and a male thread screwed with the female thread is engraved on the oute...

no. 5 approach ）

[0086] Figure 8 It is an enlarged sectional view showing a vacuum window and a lens mounting mechanism of a fifth embodiment of the laser ion source of the present invention.

[0087] Such as Figure 8 As shown, the present embodiment is configured such that the condenser lens 4 and the vacuum window 15 of the lens holder 12 of the third embodiment are movable in the laser optical axis direction. Specifically, the vacuum window 15 and the laser lens 4 are provided integrally with the lens holder 12 .

[0088] In addition, in the present embodiment, a female thread is engraved on the inner peripheral surface of the holder mounting member 14 , and a male thread screwed with the female thread is engraved on the outer peripheral surface of the lens holder 12 . Thus, by rotating the lens holder 12, the positions of the condenser lens 4 and the vacuum window 15 can be adjusted in the direction of the laser optical axis. Therefore, the focus position of the condenser lens 4 can b...

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Abstract

The present invention provides a laser ion source and a heavy ion beam therapy device which are easy to center the axis of a condensing lens and have a simple structure. According to the embodiment, there is: a vacuum container (1) that is evacuated and formed with an incident window (1a) for incident laser light (L); placed in the vacuum container (1) to generate ions by irradiation of laser light (L) the target (2); and the condensing lens (4) that condenses the laser light (L) to the target (2), the condensing lens (4) is installed on the incident window (1a) of the vacuum container (1), and the The condenser lens (4) acts as a vacuum partition.

Description

technical field [0001] Embodiments of the present invention relate to a laser ion source that generates ions by irradiating laser light, and a heavy ion radiation therapy apparatus using the laser ion source. Background technique [0002] It is well known that as a method of generating ions, there is generally a method of generating ions in a gas in an ion source. As a method of generating electric discharge, microwaves or electron beams are used. [0003] In addition, by using a laser ion source of a laser, laser light is condensed and irradiated onto a target, and the target element is vaporized and ionized to generate plasma. In addition, the laser ion source is a device that transports ions contained in the plasma as plasma, accelerates the ions when the ions are extracted, and generates an ion beam (for example, refer to Patent Documents 1 and 2). [0004] Therefore, the laser ion source can generate ions by irradiating laser light on the solid target, which is conduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J37/08A61N5/067
CPCA61N2005/1088A61N5/1077H01J27/24
Inventor 角谷晶子佐古贵行佐藤洁和金井芳治吉行健来栖努
Owner KK TOSHIBA