JP6444235B2 - Accelerator and accelerator tube temperature control method - Google Patents

Description

  The present invention relates to an accelerator comprising an acceleration tube configured to accelerate charged particles and a cooling device configured to maintain the acceleration tube at a constant temperature. The present invention also relates to a temperature management method for an accelerating tube configured to accelerate charged particles.

  Charged particles for various purposes such as research on nuclei, elementary particles, positron emission tomography (PET), cancer radiotherapy, artificial gene mutation, detoxification of radioactive waste, etc. An accelerator is used to accelerate the process. In the accelerator, a high frequency electromagnetic field is generated in the acceleration tube by inputting high frequency power to the acceleration tube, and charged particles are accelerated by the generated high frequency electromagnetic field. In order to maintain the performance of such an acceleration tube, the acceleration tube needs to have high dimensional accuracy. However, when high-frequency power is input, heat is generated in the acceleration tube due to the electrical resistance of the peripheral wall surface constituting the acceleration tube. As a result, the dimensions of the acceleration tube change due to thermal expansion, and the performance of the acceleration tube deteriorates. There is a risk. Therefore, the accelerator is provided with a cooling device for maintaining the acceleration tube at a constant temperature.

  In a conventional cooling device, for example, as disclosed in Patent Document 1, a flow path that allows a cooling fluid to pass is provided on a peripheral wall of the acceleration tube, and the acceleration tube is kept at a constant temperature by the cooling fluid flowing through the flow channel. And the inlet temperature of the cooling fluid passing through the inlet of the flow path is controlled to be constant. In order to reliably maintain such an accelerating tube at a constant temperature, it is possible to keep the temperature difference between the inlet temperature of the cooling fluid passing through the inlet of the channel and the outlet temperature of the cooling fluid passing through the outlet of the channel low. It is requested.

  Furthermore, in recent years, the use of accelerators has become active, and in accelerators, it is required to increase the amount of charged particles. However, when the amount of charged particles is increased, it is necessary to increase the high-frequency power input to the acceleration tube, thereby increasing the heat generation amount of the acceleration tube. Here, the relationship between the heat generation amount P of the acceleration tube maintained at a constant temperature by the cooling fluid, the flow rate Q of the cooling fluid, the specific heat C of the cooling fluid, and the temperature change ΔT of the cooling fluid is expressed by the following (Equation 1). become that way.

  According to the above (Formula 1), when the heat generation amount of the acceleration tube increases, it is necessary to increase the flow rate of the cooling fluid. For example, in a conventional RFQ (Radio Frequency Quadrupole) type accelerator, the flow rate is set to 300 l / min with respect to an acceleration tube having a calorific value of 16 kW in order to keep the temperature change of the acceleration tube within 1 ° C. Cooling fluid is flowing through. In a similar RFQ type accelerator, when the calorific value of the accelerating tube is 60 kW, in order to keep the temperature change of the accelerating tube within 1 ° C., it is necessary to flow the cooling fluid so that the flow rate is 1125 l / min. Further, in general, the flow rate of the cooling fluid is 1 m / sec to 3 m / sec, whereas when the flow rate of the cooling fluid is 1125 l / min as described above, the flow rate of the cooling fluid is about 9 m / sec.

JP-A-8-221138

  However, if the flow rate of the cooling fluid is increased and the flow velocity of the cooling fluid is increased so that the temperature difference between the inlet temperature and the outlet temperature of the cooling fluid is kept low in the acceleration tube having an increased calorific value, the cooling fluid As a result, the flow path is easily eroded, making it difficult to produce an acceleration tube. For example, when the flow rate of the cooling fluid is increased to 1125 l / min and the flow rate of the cooling fluid is increased to about 9 m / sec as in the RFQ type acceleration tube described above, the flow path of the acceleration tube is significantly eroded. The Therefore, as described above, it is difficult to produce an acceleration tube having a heat generation amount of 60 kW. Further, when the flow rate of the cooling fluid is increased without increasing the flow rate of the cooling fluid, it is necessary to increase the number of flow paths of the acceleration pipe and to increase the cross-sectional area of the flow path of the acceleration pipe, The structure for cooling the acceleration tube becomes complicated, and it becomes difficult to manufacture the acceleration tube. Further, in order to increase the flow rate of the cooling fluid, it is necessary to use a large-capacity pump, and as a result, there is a problem that the accelerator is increased in size and the manufacturing cost of the accelerator is increased.

  The present invention has been made in view of such a situation, and an accelerator capable of maintaining an acceleration tube having an increased calorific value at a constant temperature without increasing the flow rate of the cooling fluid, and the temperature of the acceleration tube To provide a management method.

  In order to solve the problem, an accelerator according to an aspect of the present invention includes an acceleration tube configured to accelerate charged particles, and a cooling device configured to maintain the acceleration tube at a constant temperature. The cooling device is disposed in the accelerating tube and connects between a cooling passage configured to flow a cooling fluid to maintain the accelerating tube at a constant temperature, and an inlet and an outlet of the cooling passage. A circulation path configured to flow a cooling fluid; a valve disposed in the circulation path and configured to regulate a flow rate of the cooling fluid; and disposed in the circulation path and configured to heat the cooling fluid. An accelerator, and a control unit configured to be able to control the valve and the heater, wherein the accelerator has an inlet temperature of the cooling fluid passing through the inlet of the cooling path. Exit from the cooling path A set value of the inlet temperature is determined based on the input power to the acceleration tube while allowing a temperature difference with the outlet temperature of the cooling fluid passing through the control unit, and the control unit determines the set value of the inlet temperature based on the set value of the inlet temperature. Further, at least one of the valve and the heater is controlled so as to maintain the acceleration tube at a constant temperature.

  In the accelerator according to one aspect of the present invention, the cooling device is attached to the acceleration tube and configured to measure the acceleration tube temperature of the acceleration tube, the inlet temperature detecting unit being configured to measure the inlet temperature. An accelerator tube temperature detector configured as described above, and when the set value of the inlet temperature is different from the measured value of the inlet temperature measured by the inlet temperature detector, the controller It is configured to control at least one of the valve and the heater so that the measured value of the temperature is equal to the set value, and is determined by the predetermined target value of the acceleration tube temperature and the acceleration tube temperature detection unit. When the measured value of the acceleration tube temperature is different, the control unit is configured to change the set value of the inlet temperature so that the measured value of the acceleration tube temperature is equal to the target value. .

  In the accelerator according to an aspect of the present invention, the cooling device is disposed in the circulation path, the two valves, a heat exchanger that is disposed in the circulation path and configured to cool a cooling fluid. And a tank configured to store a cooling fluid, and a pump disposed in the circulation path and configured to send the cooling fluid to the cooling path of the accelerating tube, the tank comprising the tank Located downstream of the outlet of the cooling path, the pump is positioned downstream of the tank, the heater is positioned downstream of the pump, and the circulation path is connected between the outlet of the cooling path and the tank. One of the two branch channels, one of the heat exchanger and the two valves is located, and the other of the two valves is located on the other of the two branch channels. The inlet temperature setting value When the measured value of the inlet temperature is different, the control unit controls the heat exchanger so that the measured value of the inlet temperature is equal to the set value based on the difference between the set value of the inlet temperature and the measured value. And the pump can be further controlled.

  The temperature management method for an acceleration tube according to an aspect of the present invention is a temperature management method for an acceleration tube that maintains the acceleration tube at a constant temperature by a cooling fluid flowing in a cooling path disposed in the acceleration tube that accelerates charged particles. Determining a setting value of an inlet temperature of the cooling fluid passing through the inlet of the cooling path based on input power to the acceleration tube, measuring an inlet temperature of the cooling fluid, and When the set value and the measured value of the inlet temperature are different, the flow rate of the cooling fluid flowing through the circulation path connecting the inlet and the outlet of the cooling path is set so that the measured value of the inlet temperature is equal to the set value. Performing at least one of adjusting by a valve and heating the cooling fluid flowing through the circulation path by a heater; and cooling performed at least one of the flow rate adjustment and heating. If the step of measuring the acceleration tube temperature of the acceleration tube cooled or heated by the fluid is different from the predetermined target value of the acceleration tube temperature and the measurement value of the acceleration tube temperature, the measurement of the acceleration tube temperature And changing the set value of the inlet temperature so that the value is equal to the target value.

  Therefore, even when the temperature difference between the inlet temperature and the outlet temperature of the cooling fluid is larger than the conventional temperature difference, the measured value of the acceleration tube temperature can be obtained by managing the inlet temperature of the cooling fluid as described above. Is made equal to the target value of the accelerating tube temperature, and the accelerating tube can be reliably maintained at a constant temperature. In such a configuration, it is not necessary to increase the flow rate of the cooling fluid in order to suppress the temperature difference between the inlet temperature and the outlet temperature of the cooling fluid. Therefore, it is possible to maintain the acceleration tube having the increased heat generation at a constant temperature without increasing the flow rate of the cooling fluid. Further, since it is not necessary to increase the flow rate of the cooling fluid, it is not necessary to increase the number of flow paths of the acceleration pipe, it is not necessary to increase the cross-sectional area of the flow path of the acceleration pipe, and a large-capacity pump is provided. No need to use. Therefore, as an incidental effect, an increase in the size of the accelerator can be prevented, and an increase in the manufacturing cost of the accelerator can be prevented.

  According to the accelerator and the temperature management method for an acceleration tube according to one aspect of the present invention, the acceleration tube having an increased calorific value can be maintained at a constant temperature without increasing the flow rate of the cooling fluid.

It is a schematic diagram which shows the accelerator which concerns on embodiment of this invention. It is a figure which shows the relationship between the input electric power of an acceleration tube, and acceleration tube temperature in the state which does not maintain an acceleration tube at fixed temperature. In embodiment of this invention, it is a figure which shows the relationship between the preset value of the inlet temperature of the cooling water with respect to the input power of an acceleration tube, and the target value of acceleration tube temperature. In embodiment of this invention, it is a figure which shows the relationship between the variation | change_quantity of the inlet temperature of cooling water, and the variation | change_quantity of acceleration tube temperature. It is a flowchart for demonstrating the temperature management method of the acceleration tube which concerns on embodiment of this invention.

  An accelerator according to an embodiment of the present invention and a temperature management method for an acceleration tube will be described below. First, the accelerator according to the present embodiment will be described. As shown in FIG. 1, the accelerator 1 includes an acceleration tube 2 that accelerates charged particles. The acceleration tube 2 is configured to increase the amount of charged particles by increasing the power (hereinafter referred to as “input power”) P input to the acceleration tube 2.

  The accelerator 1 includes a cooling device 3 that maintains the acceleration tube 2 at a constant temperature. The cooling device 3 has a cooling path 4 disposed in the acceleration pipe 2, and the cooling pipe 4 is maintained at a constant temperature by flowing a cooling fluid through the cooling path 4. The cooling device 3 includes the inlet 4a and the cooling path 4 of the cooling path 4 so as to circulate cooling water between the inlet 4a of the cooling path 4 through which the cooling fluid flows in and the outlet 4b of the cooling path 4 through which the cooling fluid flows out. The circulation path 5 is connected to the outlet 4b.

  The circulation path 5 includes a first branch path section 5a and a second branch path section 5b as two branch path sections 5a and 5b that branch from the outlet 4b of the cooling path 4. A first valve 6 and a second valve 7 are respectively provided in the first branch channel portion 5a and the second branch channel portion 5b, and the first valve 6 and the second valve 7 are respectively The flow rate of the cooling fluid flowing through the first branch channel portion 5a and the second branch channel portion 5b of the circulation path 5 is configured to be adjustable. Further, a heat exchanger 8 is provided in the first branch channel 5 b, and the heat exchanger 8 is disposed downstream of the first valve 6. The downstream ends of the first branch channel portion 5 a and the second branch channel portion 5 b are connected to the tank 9. The tank 9 is configured to be able to store the cooling fluid flowing through the circulation path 5, and the cooling fluid stored in the tank 9 is maintained at a set temperature after a predetermined time has elapsed.

  The circulation path 5 has a main flow path portion 5 c that connects the outlet 4 b of the cooling path 4 of the acceleration pipe 2 and the tank 9. The main flow path portion 5c is provided with a heater 10 and a pump 11, and the heater 10 is configured to heat the cooling fluid flowing through the main flow path portion 5c, and the pump 11 supplies the cooling fluid flowing through the main flow path portion 5c to a predetermined amount. It is comprised so that it may send to the cooling path 4 of the acceleration tube 2 with the pressure of. The pump 11 is located downstream of the tank 9, and the heater 10 is located downstream of the pump 11.

  An inlet temperature detector 12 is disposed at the inlet 4 a of the cooling path 4 of the acceleration tube 2, and the inlet temperature detector 12 detects the temperature of the cooling fluid passing through the inlet 4 a of the cooling path 4 (hereinafter “inlet temperature”). It is configured to measure T1. An acceleration tube temperature detection unit 13 is attached to the acceleration tube 2, and the acceleration tube temperature detection unit 13 is configured to measure the temperature T2 of the acceleration tube 2 (hereinafter referred to as “acceleration tube temperature”).

  The cooling device 3 is electrically connected to the circulation path 5, the first valve 6, the second valve 7, the heat exchanger 8, the tank 9, the heater 10, the pump 11, the inlet temperature detection unit 12, and the acceleration tube temperature detection unit 13. The control unit 14 is connected to each other. The control unit 14 is configured to recognize the input power P of the acceleration tube 2. The control unit 14 is configured to be able to store a predetermined target value of the acceleration tube temperature T2. The control unit 14 is configured to determine a set value of the inlet temperature T1 based on the input power P of the accelerating tube 2 so as to achieve a predetermined target value of the accelerating tube temperature T2. Here, the relationship between the input power P of the acceleration tube 2 and the set value of the inlet temperature T1 will be described. As indicated by the solid line R1 in FIG. 2, in a state where the acceleration tube 2 is not maintained at a constant temperature, the acceleration tube temperature T2 on the vertical axis increases in proportion to the increase in the input power P on the horizontal axis. Based on such a relationship, as indicated by a broken line B1 in FIG. 3, a solid line in FIG. 3 is used to achieve a target value of the predetermined acceleration tube temperature T2 on the vertical axis with respect to the input power P on the horizontal axis. As indicated by R2, the set value of the inlet temperature T1 on the vertical axis is set to decrease in proportion to the increase in the input power P on the horizontal axis.

  Furthermore, the control part 14 is comprised so that identification of the inlet temperature T1 of the cooling fluid measured by the inlet temperature detection part 12 is possible. The control part 14 is comprised so that identification of the acceleration tube temperature T2 measured by the acceleration tube temperature detection part 13 is possible.

  The control unit 14 is configured to control the first valve 6 and the second valve 7 so as to adjust the flow rate of the cooling fluid flowing through the first branch channel unit 5a and the second branch channel unit 5b. Yes. The control unit 14 is configured to control the heat exchanger 8 so as to adjust the temperature at which the cooling fluid flowing through the first branch channel unit 5a is cooled. The control unit 14 is configured to control the heater 10 so as to adjust the temperature at which the cooling fluid flowing through the main flow path unit 5c is heated. The control unit 14 is configured to control the pump 11 so as to adjust the pressure at which the cooling fluid flowing through the main flow path unit 5 c is sent to the cooling path 4 of the acceleration pipe 2.

  When the set value and the measured value of the inlet temperature T1 are different, the control unit 14 sets the measured value of the inlet temperature T1 to be equal to the set value based on the difference between the set value and the measured value of the inlet temperature T1. It is configured to control at least one of the first valve 6, the second valve 7, the heat exchanger 8, the heater 10, and the pump 11. For example, when the measured value of the inlet temperature T1 is larger than the set value of the inlet temperature T1, the temperature at which the cooling fluid is cooled by the heat exchanger 8 with the first valve 6 opened and the second valve 7 closed. The flow rate of the cooling fluid may be increased by the first valve 6. The flow rate of the cooling fluid may be increased by the second valve 7 in a state where the first valve 6 is closed and the second valve 7 is opened. The temperature at which the cooling fluid is heated by the heater 10 may be lowered. The flow rate of the cooling fluid may be increased by increasing the pressure at which the cooling fluid is sent by the pump 11.

  On the other hand, for example, when the measured value of the inlet temperature T1 is smaller than the set value of the inlet temperature T1, the cooling fluid is cooled by the heat exchanger 8 with the first valve 6 opened and the second valve 7 closed. The cooling temperature may be increased, or the flow rate of the cooling fluid may be decreased by the first valve 6. Cooling by the heat exchanger 8 by changing the first valve 6 and the second valve 7 from the closed state to the first valve 6 and the second valve 7 opened. The cooling fluid may be passed only through the second branch channel portion 5b without cooling the fluid. The flow rate of the cooling fluid may be decreased by the second valve 7 in a state where the first valve 6 is closed and the second valve 7 is opened. The temperature at which the cooling fluid is heated by the heater 10 may be increased. The pressure at which the cooling fluid is sent by the pump 11 may be reduced to decrease the flow rate of the cooling fluid.

  When the target value and the measured value of the acceleration tube temperature T2 are different, the control unit 14 makes the measured value of the acceleration tube temperature T2 equal to the target value based on the difference between the target value and the measured value of the acceleration tube temperature T2. In addition, the set value of the inlet temperature T1 is changed. Here, the relationship between the change amount of the inlet temperature T1 (hereinafter referred to as “inlet temperature change amount”) ΔT1 and the change amount of the acceleration tube temperature T2 (hereinafter referred to as “acceleration tube temperature change amount”) ΔT2 is illustrated in FIG. As indicated by a solid line R3, the vertical axis accelerating tube temperature change ΔT2 is proportional to the horizontal axis inlet temperature change ΔT1. Using such a relationship, the set value of the inlet temperature T1 is changed as described above.

  A temperature management method for the accelerating tube 2 according to the present embodiment will be described with reference to the flowchart of FIG. After the start of work (START), a target value of the acceleration tube temperature T2 is set in advance (step 1, S1). The input power P to the acceleration tube 2 is recognized (Step 2, S2). Using the relationship between the input power P and the set value of the inlet temperature T1 shown in FIG. 3, the inlet temperature T1 is set based on the input power P so as to achieve a predetermined target value of the acceleration tube temperature T2. A value is determined (step 3, S3). The inlet temperature detector 12 measures the inlet temperature T1 of the cooling fluid (step 4, S4).

  Next, it is determined whether or not the set value of the inlet temperature T1 is equal to the measured value (step 5, S5). When the set value and the measured value of the inlet temperature T1 are different (NO), the first value is adjusted so that the measured value of the inlet temperature T1 is adjusted to the set value based on the difference between the set value and the measured value of the inlet temperature T1. The at least one of the valve 6, the second valve 7, the heat exchanger 8, the heater 10, and the pump 11 is controlled (step 6, S6). Thereafter, the process returns to the step (S4) of measuring the inlet temperature T1 of the cooling fluid. When the set value and the measured value of the inlet temperature T1 are equal (YES), the acceleration tube temperature detection unit 13 measures the acceleration tube temperature T2 (steps 7 and S7).

  Further, it is determined whether or not the measured value of the acceleration tube temperature T2 is stable (step 8, S8). When the measured value of the acceleration tube temperature T2 is unstable (NO), the process returns to the step (S4) of measuring the inlet temperature T1 of the cooling fluid. When the measured value of the acceleration tube temperature T2 is stable (YES), it is determined whether or not the target value and the measured value of the acceleration tube temperature T2 are equal (step 9, S9). When the target value and the measured value of the acceleration tube temperature T2 are different (NO), the measured value of the acceleration tube temperature T2 is adjusted to the target value based on the difference between the target value and the measured value of the acceleration tube temperature T2. Then, the set value of the inlet temperature T1 is changed (step 10, S10). Thereafter, the process returns to the step (S4) of measuring the inlet temperature T1 of the cooling fluid. If the target value of the accelerating tube temperature T2 is equal to the measured value (YES), it is determined whether or not to continue the above-described control based on the operating state of the accelerator 1 (step 11, S11). When the control is continued (YES), the process returns to the step of recognizing the input power P to the acceleration tube 2 (S2). If the control is not continued (NO), the work is terminated (END).

  As an example, the criterion for determining whether or not to continue the control is, for example, in a situation immediately after the accelerator 1 is started, a situation in which the accelerator 1 is continuously operating, and the like. In a situation where the accelerator 1 is stopped, it may be determined that the control is not continued.

  As an example, in the temperature management method for the accelerator 1 and the acceleration tube 2 according to the present embodiment, the cooling fluid inlet temperature T1 and the acceleration tube 2 are considered in consideration of keeping the acceleration tube 2 constant. It is preferable that the temperature difference (= T3−T1) with respect to the outlet temperature T3 of the cooling fluid passing through the outlet 4b of the cooling path 4 is in the range of 10 ° C. or less.

  As described above, according to this embodiment, even when the temperature difference between the inlet temperature T1 and the outlet temperature T3 of the cooling fluid is larger than the conventional temperature difference, the inlet temperature T1 of the cooling fluid is managed as described above. By doing so, the measured value of the acceleration tube temperature T2 can be made equal to the target value of the acceleration tube temperature T2, and the acceleration tube 2 can be reliably maintained constant. In such a configuration, it is not necessary to increase the flow rate of the cooling fluid in order to suppress the temperature difference between the inlet temperature T1 and the outlet temperature T3 of the cooling fluid. Therefore, according to the present embodiment, it is possible to keep the acceleration tube 2 with the increased heat generation constant without increasing the flow rate of the cooling fluid. Further, since it is not necessary to increase the flow rate of the cooling fluid, it is not necessary to increase the number of cooling passages 4 of the accelerating tube 2, and it is not necessary to increase the cross-sectional area of the cooling passage 4 of the accelerating tube 2. There is no need to use a capacity pump. Therefore, as an incidental effect, an increase in the size of the accelerator 1 can be prevented, and an increase in the manufacturing cost of the accelerator 1 can be prevented.

  Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

  For example, as a first modification of the present invention, the first branching channel portion 5a including the first valve 6 and the heat exchanger 8 and the second branching channel portion 5b including the second valve 7 are first. Only the branch flow path 5a may be provided.

  As a second modification of the present invention, the second shunt flow of the first shunt flow path portion 5a including the first valve 6 and the heat exchanger 8 and the second shunt flow path portion 5b including the second valve 7 is used. Only the path portion 5b may be provided. In this case, the heat exchanger 8 may be provided between the tank 9 and the heater 10 in the main flow path portion 5c.

[Example]
Examples of the present invention will be described. In this example, the acceleration tube 2 provided in the accelerator 1 according to the present embodiment is kept constant by using the temperature management method for the acceleration tube 2 according to the present embodiment. The heat generation amount of the acceleration tube 2 is 60 kW. In this embodiment, the flow rate of the cooling fluid is 90 l / min with the temperature difference (= T3−T1) between the inlet temperature T1 and the outlet temperature T3 of the cooling fluid being 10 ° C. The change in the acceleration tube temperature T2 can be suppressed within 1 ° C. Therefore, in the present embodiment, it is possible to keep the acceleration tube 2 with the increased heat generation constant without increasing the flow rate of the cooling fluid as compared with the conventional flow rate.

DESCRIPTION OF SYMBOLS 1 Accelerator 2 Acceleration pipe | tube 3 Cooling device 4 Cooling path 4a Inlet 4b Outlet 5 Circulation path 5a 1st branch part 5b 2nd branch part 5c Main channel part 6 First valve 7 Second valve 8 Heat exchanger 9 Tank 10 Heater 11 Pump 12 Inlet temperature detector 13 Accelerator tube temperature detector 14 Control unit P Input power T1 Inlet temperature T2 Accelerator tube temperature ΔT1 Inlet temperature change ΔT2 Accelerator tube temperature change R1, R2, R3 Solid line B1 Broken line S1 ~ S11 Step 1 to Step 11

Claims (4)

An accelerating tube configured to accelerate charged particles;
A cooling device configured to maintain the acceleration tube at a constant temperature,
The cooling device is
A cooling path disposed in the acceleration tube and configured to flow a cooling fluid to maintain the acceleration tube at a constant temperature;
A circulation path configured to connect an inlet and an outlet of the cooling path and to flow a cooling fluid;
A valve disposed in the circuit and configured to regulate a flow rate of the cooling fluid;
A heater disposed in the circuit and configured to heat a cooling fluid;
A control unit configured to be able to control the valve and the heater,
Setting the inlet temperature based on the input power to the accelerating pipe while allowing a temperature difference between the inlet temperature of the cooling fluid passing through the inlet of the cooling passage and the outlet temperature of the cooling fluid passing through the outlet of the cooling passage Value is defined,
The accelerator is configured to control at least one of the valve and the heater so that the control unit maintains the acceleration tube at a constant temperature based on a set value of the inlet temperature. The cooling device is
An inlet temperature detector configured to measure the inlet temperature;
An accelerating tube temperature detection unit attached to the accelerating tube and configured to measure an accelerating tube temperature of the accelerating tube; and
When the set value of the inlet temperature is different from the measured value of the inlet temperature measured by the inlet temperature detecting unit, the control unit sets the measured value of the inlet temperature to be equal to the set value. And at least one of the heaters is controlled.
When the predetermined target value of the accelerating tube temperature is different from the measured value of the accelerating tube temperature measured by the accelerating tube temperature detecting unit, the control unit determines the measured value of the accelerating tube temperature as the target value. The accelerator according to claim 1, wherein the set value of the inlet temperature is changed to be equal to the value. The cooling device is
Two said valves;
A heat exchanger disposed in the circuit and configured to cool a cooling fluid;
A tank disposed in the circuit and configured to store a cooling fluid;
A pump disposed in the circulation path and configured to send cooling fluid to the cooling path of the acceleration tube;
The tank is located downstream of the outlet of the cooling path;
The pump is located downstream of the tank;
The heater is located downstream of the pump;
The circulation path has two branch parts between the outlet of the cooling path and the tank;
One of the heat exchanger and the two valves is located in one of the two branch passage portions,
The other of the two valves is located on the other of the two branch passage portions,
When the set value of the inlet temperature is different from the measured value of the inlet temperature, the measured value of the inlet temperature is equal to the set value based on the difference between the set value of the inlet temperature and the measured value. The accelerator according to claim 1 or 2, wherein a control unit is configured to further control the heat exchanger and the pump. A temperature management method for an accelerating tube that maintains the accelerating tube at a constant temperature by a cooling fluid flowing in a cooling path disposed in the accelerating tube that accelerates charged particles,
Determining a set value for the inlet temperature of the cooling fluid passing through the inlet of the cooling path based on the input power to the acceleration tube;
Measuring an inlet temperature of the cooling fluid;
When the set value of the inlet temperature is different from the measured value of the inlet temperature, the cooling flowing through the circulation path connecting the inlet and the outlet of the cooling path so that the measured value of the inlet temperature is equal to the set value. Performing at least one of adjusting the flow rate of the fluid with a valve and heating the cooling fluid flowing through the circulation path with a heater;
Measuring an accelerating tube temperature of the accelerating tube cooled or heated by a cooling fluid subjected to at least one of the flow rate adjustment and heating;
When the predetermined target value of the accelerating tube temperature is different from the measured value of the accelerating tube temperature, the set value of the inlet temperature is changed so that the measured value of the accelerating tube temperature is equal to the target value. A temperature management method for an acceleration tube including steps.

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