A continuous-wave RFQ accelerator system for neutron capture therapy

Abstract

The present invention relates to a continuous-wave RFQ accelerator system for neutron capture therapy, which includes an RFQ accelerator. The RFQ accelerator includes a housing and four electrodes arranged inside the housing. The four electrodes are distributed symmetrically about the center to form an acceleration cavity. The average radius of the acceleration cavity is 0.4 - 0.6 cm, and the minimum aperture of the acceleration cavity is 0.2 - 0.4 cm. The electrode modulation coefficient of the continuous-wave RFQ accelerator can gradually increase from 1 to a maximum value of 2.5. The sparking coefficient of the continuous-wave RFQ accelerator is 1.0 - 1.8. The cavity power of the continuous-wave RFQ accelerator is less than 120 kw, and the highest power density of the continuous-wave RFQ accelerator is less than 26 w / cm<supgt;2< / supgt;. In the present invention, compared with the combined accelerator of RFQ and DTL, only using the continuous-wave RFQ accelerator has the advantages of compact structure, high integration degree, convenient debugging, etc. Compared with the pulsed-mode RFQ accelerator, when the average beam current is the same, the requirement for the peak beam intensity is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of RFQ accelerators, and more particularly to a continuous-wave RFQ accelerator system for neutron capture therapy. Background Art

[0002] Boron neutron capture therapy (BNCT) is an innovative radiotherapy method proposed decades ago. In theory, it may be an ideal treatment for many types of cancer. In this therapy, a boron-containing drug is first injected into the patient. The boron-containing drug has a strong affinity for cancer cells and quickly accumulates in tumor cells, while rarely accumulating in normal tissues. Then, the tumor site of the patient is irradiated with thermal neutrons. When a thermal neutron is captured by 10B in a tumor cell, fission occurs, generating highly destructive α particles and recoiling 7Li nuclei, which can precisely kill tumor cells.

[0003] The initial research on BNCT for cancer treatment mainly used fission nuclear reactors as the thermal neutron source. Due to factors such as the limited number of nuclear reactors, the high difficulty of modification, and the high operating costs, the BNCT treatment system based on reactors has not been able to achieve a breakthrough improvement, severely restricting the development and popularization of BNCT worldwide. In addition, neutron source facilities in reactors are difficult to be accepted by hospitals due to prominent issues such as nuclear safety, which is not conducive to popularization.

[0004] Compared with reactor neutron sources, accelerator neutrons have the advantages of being safe, simple, having low maintenance costs, being able to be built in large cities with high population density, having a high yield of epithermal neutrons, and having great potential in improving the treatment effect of patients. Commonly concerned BNCT accelerators include linear accelerators, tandem electrostatic accelerators, and cyclotrons.

[0005] Currently, domestic and foreign BNCT research and development devices based on linear accelerators include those with only RFQ accelerators and RFQ+DTL combined accelerators. Due to beam power and cavity process challenges, they all adopt long-pulse operating modes.

[0006] Among them, the RFQ+DTL combined accelerator can accelerate to higher energies, and the DTL accelerator also has higher acceleration efficiency. However, horizontal and vertical matching is required between the RFQ and DTL accelerators, which will increase the complexity of the system. A fixed phase relationship needs to be satisfied between the RFQ and DTL accelerators, allowing only a small range of frequency changes for the RFQ and DTL accelerators, which will increase the difficulty of beam commissioning and also have higher requirements for the tuning system and water cooling system.

[0007] Considering that due to cooling problems, it is difficult for DTL accelerators to operate in high-duty-cycle modes. The duty cycle of DTL accelerators usually ranges from 10% to 20%, and can reach 50%. Compared with continuous-wave RFQ accelerators, the peak beam current intensity needs to be increased by about 5 to 10 times. With the increase in peak current intensity, the ion source needs to provide beams with low emittance and high peak current intensity, which is technically difficult and costly. With a high peak current intensity, the space charge effect is strong, and it is difficult to control the emittance of the low-energy transmission line and RFQ accelerator, making it difficult to ensure the beam transmission efficiency. If the beam emittance is too large, it will cause beam loss in the downstream acceleration structure or transmission line. This loss is not only a loss of beam intensity but also brings the problem of neutron activation, increasing the difficulty of shielding.

[0008] Therefore, a continuous-wave RFQ accelerator is needed to ensure the high-quality transmission of intense beams, operate stably in continuous-wave mode, meet the requirements of the quadrupole field of the RFQ accelerator, and be able to change frequencies, so that the commissioning and operation of the RFQ system can be simplified and the requirements for auxiliary systems can also be reduced. Summary of the Invention

[0009] The object of the present invention is to provide a continuous-wave RFQ accelerator system for neutron capture therapy to ensure the high-quality transmission of intense beams, operate stably in continuous-wave mode, meet the requirements of the quadrupole field of the RFQ accelerator, be able to change frequencies, so that the commissioning and operation of the RFQ system can be simplified and the requirements for auxiliary systems can also be reduced.

[0010] To achieve the above object, the present invention adopts the following technical solutions:

[0011] A continuous-wave RFQ accelerator system for neutron capture therapy includes a continuous-wave RFQ accelerator. The continuous-wave RFQ accelerator includes a housing and four electrodes arranged in the housing. The four electrodes are distributed symmetrically about the center to form an acceleration cavity. The average radius of the acceleration cavity is 0.4 - 0.6 cm, the minimum aperture of the acceleration cavity is 0.2 - 0.4 cm. The electrode modulation coefficient of the continuous-wave RFQ accelerator can gradually increase from 1 to a maximum value of 2.5. The spark coefficient of the continuous-wave RFQ accelerator is 1.0 - 1.8. The cavity power of the continuous-wave RFQ accelerator is less than 120 kw, and the highest power density of the continuous-wave RFQ accelerator is less than 26 w / cm 2 。

[0012] In the continuous-wave RFQ accelerator system for neutron capture therapy, preferably, the electrodes are strip-shaped, the heads of the electrodes are arc-shaped, and the tails of the electrodes are fixedly connected to the housing.

[0013] The described continuous wave RFQ accelerator system for neutron capture therapy. Preferably, the chamfer angle at the head arc of the electrode is 9 - 11°, and the angle between the tail of the electrode and the housing is 14 - 16°.

[0014] The described continuous wave RFQ accelerator system for neutron capture therapy. Preferably, the continuous wave RFQ accelerator operates in a self-excited mode.

[0015] The described continuous wave RFQ accelerator system for neutron capture therapy. Preferably, the continuous wave RFQ accelerator is of four-wing type.

[0016] The described continuous wave RFQ accelerator system for neutron capture therapy. Preferably, it further includes a cooling system without a constant temperature water machine. The cooling system includes a pressure stabilizing tank, a primary water pump, a heat exchanger, and a cooling component. The liquid outlet end of the continuous wave RFQ accelerator is connected to the liquid inlet end of the pressure stabilizing tank. A first stop valve is provided at the liquid outlet end of the continuous wave RFQ accelerator. The liquid outlet end of the pressure stabilizing tank is connected to the first water inlet end of the heat exchanger through the primary water pump. The liquid inlet end of the continuous wave RFQ accelerator is connected to the first water outlet end of the heat exchanger. The liquid outlet end of the primary water pump is provided with a first liquid outlet pipeline and a second liquid outlet pipeline. The first liquid outlet pipeline is connected to the liquid inlet end of the continuous wave RFQ accelerator. The second liquid outlet pipeline is connected to the first water inlet end of the heat exchanger. The second water outlet end of the heat exchanger is connected to the water inlet end of the cooling component. The second water inlet end of the heat exchanger is connected to the water outlet end of the cooling component.

[0017] The described continuous wave RFQ accelerator system for neutron capture therapy. Preferably, the cooling component includes a secondary water pump and a cooling tower. The second water outlet end of the heat exchanger is connected to the liquid inlet end of the cooling tower through the secondary water pump. The liquid outlet end of the cooling tower is connected to the second water inlet end of the heat exchanger. A second stop valve is provided at the second water inlet end of the heat exchanger.

[0018] Due to the adoption of the above technical solutions in the present invention, it has the following advantages:

[0019] 1. In the present invention, only using the continuous wave RFQ accelerator has advantages such as a compact structure, high integration, and convenient debugging compared with the combined accelerator of RFQ and DTL.

[0020] 2. The RFQ accelerator of this patent can operate in continuous wave mode. Compared with the RFQ accelerator in pulse mode, when the average beam current is the same, the requirement for the beam peak intensity is reduced, and the development difficulty and cost of the rest of the systems such as the ion source and transmission line will be reduced.

[0021] 3. The present invention designs different electrode modulation surfaces, obtains the beam dynamics simulation results under various electrode modulation surfaces, and selects and confirms the structural parameters of the electrode modulation surface with emittance growth less than 10% and transmission efficiency higher than 99%. Through the fine structural design of the depth of the RFQ accelerator electrode modulation surface, the beam quality can be better controlled, the transmission efficiency can be improved, the activation problem caused by beam loss can be reduced, and the size and cost of the radiation shielding system can be reduced. At the same time, the spark coefficient is also reduced, and the probability of sparking during continuous wave power loading and operation is decreased.

[0022] 4. Design the transverse cross-section of the RFQ accelerator to reduce the total high-frequency power and the maximum thermal power density, and improve the possibility and ability of continuous wave operation.

[0023] 5. The continuous wave RFQ accelerator of the present invention operates in a self-excited mode and performs frequency tracking, which can ensure the beam energy, intensity, and quality. The continuous wave RFQ accelerator system does not require water temperature tuning but adopts a self-excited mode. Under the condition of meeting the requirements of the quadrupole field of the continuous wave RFQ accelerator, the frequency is allowed to have a certain change, so there is no need for fine adjustment of the water temperature of the continuous wave RFQ accelerator. This simplifies the debugging and operation of the continuous wave RFQ accelerator system and reduces the requirements for auxiliary systems, especially the water cooling system.

[0024] 6. Compared with the RFQ water cooling system of the commonly used RFQ+DTL combined accelerator, the continuous wave RFQ accelerator system of the present invention can simplify the constant temperature water machine and the extra water circuit. For the 120kw high-frequency heat loss of the RFQ water cooling system of the traditional RFQ+DTL combined accelerator, two 65kw constant temperature water machines are required. The cost of one constant temperature water machine is about 300,000 - 400,000 yuan. After simplifying two constant temperature water machines in the continuous wave RFQ accelerator system of the present invention, the entire water cooling system only needs 300,000 - 400,000 yuan. The continuous wave RFQ accelerator system of the present invention is equivalent to 1 / 3 of the funds required for the RFQ water cooling system of the traditional RFQ+DTL combined accelerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the continuous wave RFQ accelerator in the present invention;

[0026] Figure 2 is the RFQ accelerator electrode modulation surface that satisfies the strong current space charge effect compensation in the present invention;

[0027] Figure 3-1 is Figure 1 the enlarged view of part A in

[0028] Figure 3-2 is Figure 1 the schematic structural diagram of four electrodes in (the electrode modulation surface is not drawn)

[0029] Figure 3-3 It is a partial enlarged view of position B;

[0030] Figure 4 It is the water cooling system of the continuous wave RFQ accelerator in the present invention.

[0031] Each reference numeral in the figure:

[0032] 1. Continuous wave RFQ accelerator; 2. Constant pressure tank; 3. Heat exchanger; 4. Cooling tower;

[0033] 5. Primary water pump; 6. Secondary water pump; 7. First stop valve; 8. Second stop valve;

[0034] 9. Longitudinal section of electrode; 10-1. First electrode; 10-2. Second electrode; 11-1. First water outlet end of heat exchanger;

[0035] 11-2. Second water inlet end of heat exchanger; 11-3. First water inlet end of heat exchanger;

[0036] 11-4. Second water outlet end of heat exchanger; 12. Electrode tail. Specific embodiments

[0037] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "liquid outlet end", "liquid inlet end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the use of terms such as "primary", "secondary", "first", "second", etc. to limit components is only for the convenience of differentiating the above components. Without further declaration, the above terms have no special meaning and should not be construed as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood according to specific situations.

[0040] A continuous-wave RFQ accelerator system for neutron capture therapy provided by the present invention includes a continuous-wave RFQ accelerator. The continuous-wave RFQ accelerator includes a housing and four electrodes arranged in the housing. The four electrodes are symmetrically distributed around the center to form an acceleration cavity. The average radius of the acceleration cavity is 0.4 - 0.6 cm, the minimum aperture of the acceleration cavity is 0.2 - 0.4 cm. The electrode modulation coefficient of the continuous-wave RFQ accelerator can gradually increase from 1 to a maximum value of 2.5. The spark coefficient of the continuous-wave RFQ accelerator is 1.0 - 1.8. The cavity power of the continuous-wave RFQ accelerator is less than 120 kw, and the highest power density of the continuous-wave RFQ accelerator is less than 26 w / cm 2 .

[0041] Compared with the combined accelerator of RFQ and DTL, the present invention only uses a continuous-wave RFQ accelerator, which has the advantages of compact structure, high integration, and convenient debugging. Through the structural design of the electrode modulation surface of the RFQ accelerator and the design of the transverse section of the RFQ accelerator, the beam quality can be better controlled, the transmission efficiency can be improved, the activation problem caused by beam loss can be reduced, the size and cost of the radiation shielding system can be reduced, the total high-frequency power and the maximum thermal power density can be reduced, and the possibility and ability of continuous-wave operation can be enhanced.

[0042] Next, a detailed description will be given of the continuous-wave RFQ accelerator system for neutron capture therapy provided by the embodiments of the present invention with reference to the accompanying drawings.

[0043] The RFQ accelerator uses a radio-frequency electric quadrupole field to simultaneously complete the transverse focusing, longitudinal bunching, and acceleration of the beam. The transverse focusing and longitudinal bunching capabilities are distributed through the electrode modulation surface of the RFQ accelerator. As the depth of the electrode modulation surface of the continuous-wave RFQ accelerator changes, the transverse focusing and longitudinal bunching capabilities are constantly changing, and the transmission quality of the beam is only determined by the electrode modulation surface of the RFQ accelerator. Therefore, different electrode modulation surfaces of the RFQ accelerator mean a completely different RFQ accelerator.

[0044] Specifically, different electrode modulation surfaces were designed for beam intensities of 30-40mA, and the beam dynamics simulation results under various electrode modulation surfaces were obtained. The electrode modulation surface structural parameters with emittance increase less than 10% and transmission efficiency higher than 99% were selected and confirmed.

[0045] A continuous wave RFQ accelerator system for neutron capture therapy comprises four electrodes, wherein the four electrodes are symmetrically distributed along the center to form an accelerating cavity, wherein the average radius R0 of the accelerating cavity is 0.4-0.6 cm, and the minimum aperture a of the accelerating cavity is 0.2-0.4 cm. Figure 3-1 As shown, there is a center point between the first electrode 10-1 and the second electrode 10-2, and the minimum aperture a of the accelerating cavity is the distance from the highest point of the electrode longitudinal section 9 to the center point. Figure 3-1 Only two electrodes are enlarged for illustration.

[0046] The electrode modulation coefficient of the continuous wave RFQ accelerator can gradually increase from 1 to a maximum value of 2.5, wherein the electrode modulation coefficient can initially start from 1 and eventually increase to a maximum value of 2.5, and the electrode modulation coefficient between the electrode modulation coefficient 1 and the electrode modulation coefficient 2.5 is any one or several or all of 1.2, 1.3, 1.4, 1.5, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, the sparking coefficient of the continuous wave RFQ accelerator is 1.24-1.26, the cavity power of the continuous wave RFQ accelerator is less than 120kw, and the maximum power density of the continuous wave RFQ accelerator is less than 26w / cm 2 .

[0047] Preferably, the average radius R0 of the accelerating cavity is 0.53 cm, the minimum aperture a of the accelerating cavity is 0.3 cm, the electrode modulation coefficient of the continuous wave RFQ accelerator can be gradually increased from 1 to a maximum value of 2.5, the sparking coefficient of the continuous wave RFQ accelerator is 1.25, the cavity power of the continuous wave RFQ accelerator is less than 120 kW, and the maximum power density of the continuous wave RFQ accelerator is less than 26 w / cm 2 The continuous wave RFQ accelerator accelerates the beam energy to 2.6-5 MeV, with a peak current intensity of 20-50 mA.

[0048] like Figure 2 As shown, the electrode modulation surface is a sine curve. Furthermore, in order to improve the transmission efficiency of the high-current beam and reduce the increase in the beam emittance, the electrode modulation surface can also be optimized to make the combined force of the external focusing force provided by the continuous wave RFQ accelerator and the space charge force of the high-current beam more linear, satisfying the compensation function of the high-current space charge effect. Figure 2The figure shows a comparison between a sine curve and the electrode modulation surface after compensating for the space charge effect, and presents an electrode modulation surface curve that satisfies the space charge effect compensation for a beam current of 30 mA.

[0049] The transverse cross-section parameters that affect the high-frequency power loss and maximum power density of the RFQ accelerator are mainly the first cut angle of the electrode and the second cut angle of the electrode . As Figure 3-2 , Figure 3-3 shown, the four electrodes are strip-shaped, the head of the electrode is arc-shaped, and the tail of the electrode is fixedly connected to the housing.

[0050] The first cut angle of the electrode is the cut angle at the arc of the head of the electrode; the second cut angle of the electrode is the included angle between the tail 12 of the electrode and the housing where 4 electrodes are placed.

[0051] The first cut angle of the electrode is 9 - 11°, and the second cut angle of the electrode is 14 - 16°. Preferably, the first cut angle of the electrode is 10°, and the second cut angle of the electrode is 15°.

[0052] Since there is only one high-frequency acceleration element, the continuous-wave RFQ accelerator, it can operate in the self-excited mode for frequency tracking, which can also ensure the beam energy and quality. When the requirements of the quadrupole field of the continuous-wave RFQ accelerator are met, the frequency is allowed to have a certain change, and it is not necessary to finely adjust the water temperature of the continuous-wave RFQ accelerator frequency. This simplifies the debugging and operation of the continuous-wave RFQ system and reduces the requirements for the auxiliary system, especially the water cooling system.

[0053] As Figure 4 shown, a water cooling system for a continuous-wave RFQ accelerator includes a continuous-wave RFQ accelerator 1, a constant pressure tank 2, a heat exchanger 3, a primary water pump 5, and a cooling component. The liquid outlet end of the continuous-wave RFQ accelerator 1 is connected to the liquid inlet end of the constant pressure tank 2, the liquid outlet end of the constant pressure tank 2 is connected to the first water inlet end 11 - 3 of the heat exchanger through the primary water pump 5, and the liquid inlet end of the continuous-wave RFQ accelerator 1 is connected to the first water outlet end 11 - 1 of the heat exchanger.

[0054] The liquid outlet end of the primary water pump 5 is provided with a first liquid outlet pipeline and a second liquid outlet pipeline. The first liquid outlet pipeline is connected to the liquid inlet end of the continuous-wave RFQ accelerator 1, and the second liquid outlet pipeline is connected to the first water inlet end 11 - 3 of the heat exchanger.

[0055] The cooling assembly includes a secondary water pump 6 and a cooling tower 4. The second water outlet end 11-4 of the heat exchanger is connected to the liquid inlet end of the cooling tower 4 through the secondary water pump 6, and the water outlet end of the cooling tower 4 is connected to the second water inlet end 11-2 of the heat exchanger.

[0056] A first stop valve 7 is provided at the liquid outlet end of the continuous wave RFQ accelerator 1.

[0057] A second stop valve 8 is provided at the second water inlet end of the heat exchanger 3.

[0058] During operation, the cooling water that has undergone heat exchange in the continuous wave RFQ accelerator 1 circulates and enters the constant pressure tank 2 from the cooling water outlet end of the continuous wave RFQ accelerator 1. The constant pressure tank 2 buffers the pressure in the pipeline of the water cooling system. The primary water pump 5 sends the primary cooling water into the first water inlet end 11-3 of the heat exchanger, transfers the heat to the secondary water through the heat exchanger, and then enters the liquid inlet end of the continuous wave RFQ accelerator 1 from the first water outlet end 11-1 of the heat exchanger; the secondary water pump 6 pumps the secondary cooling water out from the second water outlet end 11-4 of the heat exchanger and enters the liquid inlet end of the cooling tower 4. The secondary cooling water cooled by the cooling tower 4 enters the second water inlet end 11-2 of the heat exchanger from the water outlet end of the cooling tower 4.

[0059] Compared with the RFQ water cooling system of the commonly used RFQ+DTL combined accelerator, the continuous wave RFQ accelerator system of the present invention can simplify the constant temperature water machine and the additional water circuit. For the 120kw high-frequency heat loss of the RFQ water cooling system of the RFQ+DTL combined accelerator, two 65kw constant temperature water machines are required. The cost of one constant temperature water machine is about 300,000-400,000 yuan. After simplifying two constant temperature water machines in the continuous wave RFQ accelerator system of the present invention, the entire water cooling system only needs 300,000-400,000 yuan. The continuous wave RFQ accelerator system of the present invention is equivalent to 1 / 3 of the funds required for the RFQ water cooling system of the RFQ+DTL combined accelerator.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A continuous wave RFQ accelerator system for neutron capture therapy, characterized in that, Including an RFQ accelerator, the RFQ accelerator includes a housing and four electrodes arranged inside the housing. The four electrodes are symmetrically distributed around the center to form an acceleration cavity. The average radius of the acceleration cavity is 0.4 - 0.6 cm, the minimum aperture of the acceleration cavity is 0.2 - 0.4 cm. The electrode modulation coefficient of the continuous-wave RFQ accelerator can gradually increase from 1 to a maximum value of 2.

5. The sparking coefficient of the continuous-wave RFQ accelerator is 1.0 - 1.

8. The cavity power of the continuous-wave RFQ accelerator is less than 120 kw, and the highest power density of the continuous-wave RFQ accelerator is less than 26 w / cm 2 ; The continuous-wave RFQ accelerator adopts a self-excited mode; It also includes a cooling system without a constant-temperature water machine. The cooling system includes a pressure-stabilizing tank, a primary water pump, a heat exchanger, and a cooling component. The liquid outlet end of the continuous-wave RFQ accelerator is connected to the liquid inlet end of the pressure-stabilizing tank. A first stop valve is provided at the liquid outlet end of the continuous-wave RFQ accelerator. The liquid outlet end of the pressure-stabilizing tank is connected to the first water inlet end of the heat exchanger through the primary water pump. The liquid inlet end of the continuous-wave RFQ accelerator is connected to the first water outlet end of the heat exchanger. The liquid outlet end of the primary water pump is provided with a first liquid outlet pipeline and a second liquid outlet pipeline. The first liquid outlet pipeline is connected to the liquid inlet end of the continuous-wave RFQ accelerator. The second liquid outlet pipeline is connected to the first water inlet end of the heat exchanger. The second water outlet end of the heat exchanger is connected to the water inlet end of the cooling component. The second water inlet end of the heat exchanger is connected to the water outlet end of the cooling component.

2. The continuous wave RFQ accelerator system for neutron capture therapy according to claim 1, characterized in that, The electrode is strip-shaped, the head of the electrode is arc-shaped, and the tail of the electrode is fixedly connected to the housing.

3. The continuous wave RFQ accelerator system for neutron capture therapy according to claim 2, wherein The chamfer angle at the arc of the head of the electrode is 9-11°, and the angle between the tail of the electrode and the housing is 14-16°.

4. The continuous wave RFQ accelerator system for neutron capture therapy according to any one of claims 1 to 3, characterized in that, The continuous-wave RFQ accelerator is of a four-wing type.

5. The continuous wave RFQ accelerator system for neutron capture therapy according to claim 4, wherein The cooling component includes a secondary water pump and a cooling tower. The second water outlet end of the heat exchanger is connected to the liquid inlet end of the cooling tower through the secondary water pump. The water outlet end of the cooling tower is connected to the second water inlet end of the heat exchanger. A second stop valve is provided at the second water inlet end of the heat exchanger.

Images