KR-20260066070-A - Magnet assembly with integrated charged particle beam dump

Abstract

A magnet assembly including an integrated charged particle beam dump, such as a dipole magnet assembly, and a system including the same are described. An example of a dipole magnet assembly includes a channel assembly composed of a dipole bending magnet and a charged particle beam dump. The dipole magnet may be configured to generate a uniform magnetic field within the channel assembly that bends the trajectory of the charged particle mouth. The channel assembly may be configured to support a vacuum for the charged particle beam while absorbing secondary state particles using the charged particle beam dump. The charged particle beam dump may be detachably fixed to the channel assembly, welded to the channel assembly, or inserted into the channel assembly. Each charged particle beam dump may utilize an active cooling system, such as a cooling tube or an embedded cooling channel, to mitigate excessive heat generation caused by the absorption of secondary state particles. Materials are also described.

Inventors

• 스니츨러, 그레고리 루크
• 요시키 프란젠, 켄 케이.
• 두나예프스키, 알렉산더
• 지브, 다니엘 스티븐

Assignees

• 티에이이 테크놀로지스, 인크.

Dates

Publication Date

20260512

Application Date

20240807

Priority Date

20230808

Claims (20)

1. As a channel assembly, (i) a housing and (ii) an enclosure comprising a charged particle beam dump fixed to the housing - The above-mentioned enclosure forms a channel extending from a first opening to a second opening, and the channel includes an arched portion, and A channel assembly comprising: a charged particle beam dump including a support member forming a wall of the enclosure extending along at least a portion of the arched portion.
2. In claim 1, the charged particle beam dump is A channel assembly further comprising a refractory metal layer supported on a first surface of the support member, wherein the first surface faces the channel.
3. In paragraph 2, the channel assembly comprises one or more of niobium, molybdenum, tantalum, tungsten, rhenium, titanium, vanadium, chromium, zirconium, hafnium, ruthenium, rhodium, osmium, or iridium.
4. In paragraph 3, the channel assembly, wherein the refractory metal layer is made of molybdenum or a molybdenum alloy.
5. In paragraph 4, the channel assembly, wherein the molybdenum alloy is titanium-zirconium-molybdenum.
6. A channel assembly according to any one of paragraphs 2 to 5, wherein the refractory metal layer has a thickness in the range of 1 mm to 10 mm.
7. A channel assembly according to any one of paragraphs 2 to 6, wherein the refractory metal layer is explosively bonded to the first surface of the support member.
8. A channel assembly according to any one of paragraphs 2 to 6, wherein the refractory metal layer is printed on the first surface of the support member.
9. A channel assembly according to any one of claims 2 to 6, wherein the refractory metal layer is deposited on the first surface of the support member through sputtering or electroplating.
10. In any one of paragraphs 2 to 9, the first surface of the support member is flat, forming a channel assembly.
11. A channel assembly according to any one of claims 2 to 10, wherein the first surface of the support member is curved.
12. In any one of claims 1 to 11, the charged particle beam dump is, A channel assembly further comprising one or more cooling tubes supported on a second opposite surface of the support member—the one or more cooling tubes being configured to conduct a coolant.
13. In Clause 12, the channel assembly wherein one or more cooling tubes are composed of cooling coils.
14. A channel assembly according to claim 12 or 13, wherein one or more cooling tubes are configured to release heat from the charged particle beam dump convectively through the coolant.
15. A channel assembly according to any one of claims 12 to 14, wherein one or more cooling tubes are made of a non-magnetic metal.
16. In paragraph 15, the channel assembly, wherein one or more cooling tubes are made of austenitic stainless steel, copper, or a copper alloy.
17. A channel assembly according to any one of claims 12 to 16, wherein one or more cooling tubes are brazed to a second surface of the support member.
18. A channel assembly according to any one of claims 12 to 16, wherein one or more cooling tubes are mounted under pressure on a second surface of the support member with a thermal interface material in between.
19. In paragraph 18, the above thermal interface material is a channel assembly having a thermal conductivity of 10 W/(m K) or more.
20. In claim 18 or 19, the thermal interface material comprises a channel assembly comprising aluminum oxide.

Description

Magnet assembly with integrated charged particle beam dump This specification relates to a magnet assembly including a generally integrated charged particle beam dump, e.g., a dipole magnet assembly, and a system including the same. Boron neutron capture therapy (BNCT) is a treatment method for various types of cancer, including some of the most difficult to treat. BNCT is a technique that uses boron compounds to selectively treat only tumor cells without damaging normal cells. Boron compounds enable efficient absorption by multiple cell types and selective drug accumulation at target sites, such as tumor cells. Boron-containing cells can be irradiated with neutrons, for example, in the form of a neutron beam. The neutrons react with the boron to eliminate the tumor cells. Neutron beams for BNCT can be generated through various techniques. One such technique involves irradiating a suitable neutron-generating target with a beam of charged particles, such as a proton beam or a deuterium beam. The charged particles react with nuclei within the target to emit a neutron beam within a target energy range (e.g., the epithermal energy spectrum) that can be used for BNCT. To generate the maximum number of neutrons in this target energy range, a controllable beam optics system is used to ensure that the cross-sectional area and phase space of the charged beam are maintained across the entire beamline. This ensures that the charged beam scans relatively uniformly toward the target. Additionally, dipole magnets (e.g., dipole bending magnets) are often implemented in the beamline to alter the trajectory of the charged beam, allowing the beam to be steered toward a desired direction, for example, toward a target near the treatment room to be used in BNCT. However, charged particle beams are generally not composed solely of particles of the same type with the same kinetic energy. A significant number of secondary state particles may exist. Secondary state particles may include particles that differ from the primary state particles of the charged beam in atomic number, atomic mass, charge, and/or kinetic energy, and generally each possesses a different momentum-to-charge ratio. Therefore, when interacting with the magnetic field generated by a dipole magnet, these secondary state particles can be deflected at various angles and collide with components of the beamline. Such collisions can cause immediate or eventual damage due to excessive heat generation and/or ion implantation. This can lead to the failure of the beam system, for example, by destroying or contaminating the vacuum. Figure 1a is a schematic diagram illustrating an example of a neutron beam system used in boron neutron capture therapy (BNCT). FIG. 1b is a schematic diagram illustrating a more detailed example of a neutron beam system configured for use in BNCT. FIG. 2a is a perspective view illustrating an example of a neutron generating target. FIG. 2b is a side view illustrating an example of an assembly for accommodating a neutron-generating target. FIG. 2c is a cross-sectional view illustrating an example of an assembly for accommodating a neutron-generating target. FIG. 3 is a perspective view illustrating an example of a dipole magnet assembly including a dipole magnet and a channel assembly. Figures 4a to 4c are various drawings illustrating examples of dipole bending magnets. FIG. 5a is a cross-sectional view illustrating an example of a channel assembly. FIG. 5b is a cross-sectional view illustrating another example of a channel assembly. FIGS. 6a and 6b are cross-sectional views illustrating an example of a dipole magnet assembly including a dipole magnet and a channel assembly. FIGS. 7a and 7b are various drawings illustrating an example of a channel assembly having a detachable charged particle beam dump. FIG. 7c is a cross-sectional view illustrating an example of a dipole magnet assembly including a channel assembly having a dipole magnet and a detachable charged particle beam dump. FIGS. 8a and 8b are various drawings illustrating an example of a channel assembly having a welded charged particle beam dump. FIG. 8c is a perspective view of a charged particle beam dump that can be welded to a channel assembly. FIG. 8d is a cross-sectional view illustrating an example of a dipole magnet assembly including a channel assembly having a dipole magnet and a welded charged particle beam dump. FIGS. 9a and 9b are various drawings illustrating an example of a channel assembly having an inserted charged particle beam dump. FIG. 9c is a cross-sectional view illustrating an example of a dipole magnet assembly including a channel assembly having a dipole magnet and an inserted charged particle beam dump. FIGS. 10a to 10c are schematic diagrams illustrating examples of neutron beam systems including high-energy beamlines composed of one or more dipole magnet assemblies. FIG. 11 is a flowchart of an exemplary method for bending and filtering a charged particle