JPH118099A - Accelerating tube using heat pipe and temperature control system thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accelerating tube which easily attains the accelerating performance of charged particles by reducing a temperature distribution width generated in the axial direction of the accelerating tube, and a simple temperature control system. SOLUTION: This accelerating tube 1 is provided with an incorporated heat pipe 9 for transmitting heat at least in the axial direction. Especially, an axial hole may be formed in an external wall to embed the heat pipe, or the external wall may be formed into a double structure for a heat pipe structure. The accelerating tube 1 using the heat pipe has small axial temperature distribution, therefore, it is sufficient for a temperature control system to make a control so as to meet heat balance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field for uniformizing thermal expansion in an acceleration tube used for a particle accelerator for accelerating charged particles to high energy, and a technical field related to a temperature control system for the acceleration tube.

[0002]

2. Description of the Related Art Various types of particle accelerators for accelerating charged particles such as electrons to a high energy are widely used in research in physics and biology and in various industries. The accelerating tube used in the linear particle accelerator is a part that forms an accelerating electric field, and is usually composed of a large number of resonance cavities (acceleration structures) having a very high Q value of 10,000 or more, and affects the performance of the accelerator. It is an important component. The charged particles are accelerated by inputting a microwave having a resonance frequency into the acceleration structure and generating an acceleration electric field having substantially the same phase velocity as the accelerated particles. The accelerating tube is formed of a metal such as oxygen-free copper. In each resonance cavity, ohmic loss of the input microwave occurs within the skin depth of the metal surface. Further, since the coefficient of thermal expansion of the metal is large, the state of particle acceleration tends to change due to deformation due to temperature.

In order to form a stable accelerating electric field, it is preferable to keep the temperature of the accelerating tube constant with time and to make the temperature distribution of the entire accelerating tube uniform. For this reason, conventionally, it has been customary to flow a considerable amount of cooling water in the beam axis direction of the acceleration tube and control the temperature of the water to adjust the temperature of the acceleration tube. However, in the presence of the charged particle beam, the energy of the microwave is supplied to the charged particles from the accelerating microwave, so that the intensity of the microwave in each cavity is not constant and a distribution of the intensity occurs. Therefore, the thermal load differs for each cavity and a temperature distribution occurs, and the thermal expansion differs for each cavity due to the thermal load distribution. Thus, a distribution of the resonance frequency occurs, and a shift in the acceleration phase occurs, thereby deteriorating the acceleration performance. there were.

Japanese Patent Application Laid-Open No. 8-273898 discloses that in order to eliminate such a thermal expansion distribution, the thickness is increased stepwise in response to a thermal load distribution that decreases from one end of the acceleration tube to the other end. An accelerating tube having a cooling water jacket or adjusting the contact area with the cooling water or the heat transfer of the contact surface to offset the difference in thermal expansion is disclosed. In this method, there are problems that the cost of equipment increases due to the complicated shape of the cooling jacket, and that only the heat distribution load designed in advance can be dealt with.

Further, in the conventional accelerator, it is necessary to circulate a considerable amount of water in order to maintain the temperature of the accelerator. In particular, the response time to the temperature change and the time required from start-up to steady operation depend on the amount of circulating water. Therefore, a large amount of circulating water is required to stabilize the operation, equipment for circulating a large amount of cooling water and equipment for controlling the temperature of a large amount of circulating water are required, and large restrictions on the installation location etc. It has become. Furthermore, the cooling water temperature control system causes a rise in equipment costs and operation costs, and means for reducing or eliminating these costs are required.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an acceleration tube using a heat pipe which facilitates temperature adjustment by reducing the temperature distribution width generated in the axial direction of the acceleration tube. And to provide a simpler temperature control system for controlling the temperature of the accelerator tube.

[0007]

In order to solve the above-mentioned problems, an acceleration tube of the present invention used in a particle accelerator for accelerating charged particles to high energy incorporates a heat pipe for transferring heat at least in the axial direction of the acceleration tube. It is characterized by that. The heat pipe is one in which a closed space having a capillary structure on the inner wall is evacuated and a small amount of a working fluid such as water or Freon is sealed. When a part of the heat pipe is heated, the hydraulic fluid deprives the latent heat of evaporation and evaporates, and the pressure inside the heat pipe rises. To condense. The working fluid condensed in the low temperature part is conveyed to the evaporating part by capillary action and evaporates again, and the heat conduction from the high temperature part to the low temperature part is continuously performed. Since the heat pipe has a heat conduction effect utilizing the latent heat of vaporization in this way, it exhibits an extremely large thermal conductivity of several thousand times that of metal, and also has a thermal response corresponding to the propagation speed of atmospheric pressure. One hundred times faster.

[0008] The acceleration tube using the heat pipe of the present invention,
Since heat is transferred in the axial direction by the heat pipe, substantial thermal conductivity is extremely high, and the temperature width in the axial direction is reduced, so that a difference in thermal expansion based on a temperature difference does not occur. Accordingly, there is no shift in the acceleration phase caused by the difference in the resonance frequency, and the acceleration performance does not deteriorate. In addition, as a form of the heat pipe of the acceleration tube, a tube formed separately in a hole drilled in the axial direction in the outer wall of the acceleration tube may be housed. A tubular heat pipe may be additionally provided.

At present, heat pipes having various shapes are on the market. For example, the accelerating tube can be formed by selecting an appropriate shape such as a rod shape and inserting it into an axial hole. In the accelerating tube thus formed, the temperature difference on the heat pipe surface is extremely small, so that the temperature distribution width in the axial direction is small. Note that a heat transfer paste may be interposed to ensure thermal contact between the heat pipe and the axial hole. Further, in order to suppress the temperature distribution in the circumferential direction, it is preferable that the axial holes into which the heat pipes are inserted are formed at equal intervals in the outer wall of the acceleration tube. For example, holes of the same size may be formed alternately with holes for the heat pipe, and cooling water may be passed through the holes.

[0010] In the case where the heat pipe is attached to the outer wall of the accelerating tube, it is not necessary to form a hole in the outer wall, and the accelerating tube is easily and economically manufactured. Such an acceleration tube can be formed by, for example, solidifying a heat pipe along an outer wall with heat transfer cement. Needless to say, the outer wall of the accelerating tube may have a double-pipe structure and a heat pipe structure. In the structure using the independently formed heat pipe, the temperature may be slightly different between the portion where the heat pipe is embedded and the portion away from the heat pipe due to the thermal conductivity of the metal itself. However, if the heat pipe is formed directly inside the outer wall of the accelerating tube, the heat pipe is covered over the entire region of the accelerating tube, so that a temperature difference hardly occurs in the circumferential direction.

The heat pipe structure is constructed by inserting a wig into a double tube structure and then sealing a small amount of a heat medium. Further, instead of inserting the wig, a narrow groove may be formed on the inner wall of the double tube structure. The wig and the narrow groove are for ensuring the transfer of the heat transfer liquid by capillary action. In the case where the heat pipe is formed integrally with the accelerating tube in this way, advanced technology is required to make the double pipe a heat pipe structure, but the temperature distribution is improved and the number of processes is reduced, resulting in lower cost. Have the potential to do so. Note that a cooling pipe that allows the refrigerant to flow in the axial direction may be embedded or provided outside the double pipe portion having the heat pipe structure to maintain thermal contact with the outer wall of the acceleration pipe.

Further, an electric heater may be wound around the outer surface of the acceleration tube so that the acceleration tube can be heated.
It is preferable that the heating wire of the electric heater is provided so as to reciprocate along substantially the same path so that the current flows in the opposite direction. In this way, the reciprocating current excites an electromagnetic field of the same strength in both the forward and reverse directions to cancel out each other and suppress the generation of an electromagnetic field, thereby making it possible to prevent the movement of the charged particles from being disturbed.

It is to be noted that instead of cooling or heating over the entire portion where the heat pipe is incorporated by utilizing the high heat conduction of the heat pipe, only the heat pipe or a part of the heat pipe structure is cooled or heated. It may be. In this way, the heat pipe structure has high heat conduction performance despite the simple structure, so that the effect of the heat exchange performed in a part of the place where the heat pipe is embedded is reduced by the heat pipe. Immediately spread to the entire thermally connected portion, and the temperature of the entire acceleration tube becomes uniform.

Further, the acceleration tube further includes a heat exchange section, and is thermally connected to a heat pipe or a heat pipe structure configured to equalize the temperature of the acceleration tube by the same heat pipe or a separate heat pipe. You may do so. Providing the heat exchanging unit at a distance from the main part of the accelerating tube in this manner enables more simple and efficient heat exchange. Even if the heat exchange part for cooling or heating is far away,
Since a large amount of heat is conducted through the heat pipe, the temperature distribution in the main part of the acceleration tube is made uniform, the dimensions are stabilized, and the acceleration performance can be maintained.

Further, in order to solve the above problems, the temperature control system for an acceleration tube of the present invention further comprises a temperature sensor in contact with the acceleration tube using the heat pipe.
The temperature control of the acceleration tube is performed by controlling the electric power applied to the heater based on the output of the temperature sensor. The inventors of the present invention have noticed that the purpose of controlling the temperature of the accelerating tube is to maintain the dimensions of the accelerating tube constant and eliminate the deviation of the resonance frequency, and forcibly generate heat in the accelerating tube. The influence of the difference in thermal expansion is eliminated by keeping the temperature of the accelerating tube uniformly at a predetermined temperature, without being limited to the removal.

That is, the use of the acceleration tube using the above-described heat pipe suppresses the temperature fluctuation in the axial direction, and appropriately cools the acceleration tube by heat radiation depending on the environment surrounding the acceleration tube. Rather, the temperature is adjusted by adjusting the heating side with a simple electric heater. This is because it is more important that the temperature difference be within a predetermined range than the temperature level in order to maintain the dimensions of the acceleration tube. In this way, the cooling by the refrigerant is omitted, and the temperature is controlled only by heating with the electric heater, so that the facility cost and the operating cost can be greatly reduced.

Further, the temperature of the acceleration tube may be controlled by controlling the electric power applied to the heater or the temperature of the cooling water based on the output of the temperature sensor.
If it is attempted to control the temperature only on the heating side, it takes time to cool the accelerating tube once it is overheated, which impairs the responsiveness of the temperature control. Thus, the temperature of the acceleration tube is controlled. By configuring the temperature control system in such a manner that both overheating and cooling can be performed, control responsiveness is improved. Also in this case, since the effect of the heat pipe is expected, the circulation amount of the cooling water as the refrigerant can be greatly reduced, and the requirement of the temperature control accuracy of the refrigerant itself is eased.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An acceleration tube using a heat pipe according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a first embodiment of an acceleration tube using the heat pipe of the present invention, and FIG. 2 is a cross-sectional view showing a state cut along II-II in FIG. The accelerating tube 1 in the present embodiment has a cylindrical shape formed of oxygen-free copper,
The inside is partitioned into a number of resonance cavities 5 by a disk-shaped acceleration tube disk 3 having a hole. The resonance cavity 5 is designed to have an extremely high Q value. Microwaves are introduced through an input coupler (not shown) provided at one end of the accelerating tube, and an accelerating electric field having substantially the same phase velocity as the charged particles passing through the resonance cavity 5 is generated in each resonance cavity. To accelerate. A hole 7 formed in the center of the acceleration tube disk 3 is a beam passage hole through which an electron beam passes.

The accelerating tube of the present embodiment is provided with a heat pipe 9 for transferring a large amount of heat in the axial direction in the outer wall of a cylinder surrounding the accelerating tube disk 3. As shown in an arrow view (FIG. 2) showing a state cut along the line II-II in FIG. 1, a large number of holes having the same diameter are formed in the outer wall of the accelerating tube 1 at equal intervals in the axial direction. Round bar type heat pipes 9 are inserted every other one. The accelerating tube 1 is cooled by passing cooling water through the remaining holes 11. The heat generated in the acceleration tube 1 varies depending on the axial distance, such as being large at the entrance of the acceleration tube and small at the exit. However, in the acceleration tube 1 incorporating the heat pipe 9 that transmits a large amount of heat in the axial direction, the acceleration is accelerated. Even if a temperature difference occurs in the tube 1, heat is transferred from the high-temperature portion to the low-temperature portion through the heat pipe 9, so that the temperature is equalized over the entire length of the acceleration tube 1, and the temperature difference between the portions becomes extremely small. Since the heat generated in the accelerating tube 1 is carried out by the cooling water passing through the hole 11, the temperature level of the tube converges to a predetermined value determined by the heat balance.

FIG. 3 is a block diagram showing a temperature control system for an acceleration tube using a heat pipe. Heat exchanger 19
The cooling water cooled to an appropriate temperature is sent out to a cooling water pipe 13 by a pump, and the temperature is further finely adjusted by an electric heater 15 provided in the middle of the cooling pipe 13 before being supplied to the acceleration pipe 1. The cooling water is divided into a large number of cooling water passages 11 cut into the pipe wall of the accelerating pipe 1 to cool the accelerating pipe 1, and then gathers in a single cooling water pipe 13 outside the accelerating pipe to form a heat exchanger. Return to 19. A temperature sensor 21 is installed in contact with the acceleration tube 1 to directly measure the temperature of the acceleration tube 1,
The output of the electric heater 15 is adjusted by controlling the heater power supply 17 based on the measured output.

Conventionally, it has been attempted to control the temperature distribution width of the accelerating tube to preferably 0.1 degrees or less by using cooling water flowing in the hole formed in the tube wall in the axial direction. Therefore, it was necessary to eliminate the temperature difference between the inlet and the outlet. However, in the accelerating tube 1 of the present embodiment, the heat generated in the tube is removed by the cooling water. However, since the temperature fluctuation width in the axial direction is eliminated by the heat pipe 9, it is sufficient if only the heat balance can be accurately controlled. Thus, the amount of cooling water can be greatly reduced. Conventionally, the temperature of the cooling water was controlled with an accuracy of about 0.1 degree for controlling the temperature of the accelerating tube. However, in the accelerating tube 1 of this embodiment, the temperature of the accelerating tube is directly measured to control the heat. Therefore, it is not necessary to precisely control the temperature of the cooling water. Also, regarding the temperature control point of the accelerating tube 1, it has been conventionally difficult to determine the optimum temperature measurement position due to the existence of the temperature distribution. However, in the accelerating tube 1 of this embodiment, the temperature deviation in the axial direction is difficult. Is small, and the temperature measurement position does not greatly affect the temperature control performance, so that the position where the temperature sensor is installed can be easily selected.

FIG. 4 is a sectional view of a second embodiment of an acceleration tube using a heat pipe according to the present invention, cut along a plane perpendicular to an axis. In this embodiment, a heat pipe structure is formed directly on the inner surface of the outer wall of the acceleration tube 1 instead of embedding the heat pipe in the outer wall of the acceleration tube 1. A closed space forming a heat pipe structure is formed inside the inner wall of the cylindrical outer wall of the acceleration tube 1. A wig is inserted along the wall in this space, and a small amount of hydraulic fluid is injected to form a heat pipe structure. In practice, for example, a part of the closed space is opened, the working fluid is appropriately injected, then heated to boil the working fluid, and air is discharged from the opening together with the steam. The heat pipe 9 can be formed relatively easily by a method of closing and sealing the opening.

A groove may be formed on the wall instead of the wig. As the working fluid, an appropriate heat medium such as chlorofluorocarbon or alcohol may be selected depending on the working temperature. In the present embodiment, water having a large latent heat of evaporation and being chemically stable is suitable. A plurality of holes 11 are formed at appropriate intervals in the axial direction outside the heat pipe structure, and cooling water flows through these holes. Note that reference numeral 3 in the drawing denotes an acceleration tube disk. In the structure using the independently formed heat pipe, the temperature may be slightly different between the portion where the heat pipe is embedded and the portion away from the heat pipe due to the thermal conductivity of the metal itself. However, the second
If the heat pipe is formed directly inside the outer wall of the accelerating pipe as in the accelerating pipe 1 of the embodiment, the heat pipe is covered over the entire area of the accelerating pipe, so that a temperature difference hardly occurs in the circumferential direction. The dimensional stability of the accelerator tube is further improved.

FIG. 5 is a block diagram showing another embodiment of the temperature control system of the acceleration tube using the heat pipe of the present invention. Conventional temperature control was to adjust the temperature by flowing the refrigerant directly so as to penetrate in the axial direction of the acceleration tube,
In the present embodiment, heat exchange with cooling water is performed in a part of the heat pipe portion of the acceleration tube by utilizing the temperature homogenizing action of the heat pipe. A heat pipe 9 extends on the outer wall of the acceleration tube 1 in the axial direction. A heat exchanger 23 is provided in contact with a part of the outer wall.
3 is connected, and the cooling water is supplied to the electric heater 15 and the heat exchanger 19.
Circulating through. The temperature sensor 21 is a heat exchanger 23
Is measured, and the cooling water temperature is adjusted via the heater power supply 17 so that the temperature becomes constant.

With such a configuration, the heat generated in the acceleration tube 1 is absorbed by the heat exchanger 23 located locally, and the temperature distribution in the acceleration tube is averaged by the action of the heat pipe. Dimensional stability and stable particle acceleration can be maintained. The heat exchanger 23 attached to the acceleration tube 1
The number and the arrangement position can be appropriately selected. Further, the temperature sensor 21 may measure the temperature of the acceleration tube 1 instead of the heat exchanger 23.

FIG. 6 is a block diagram showing still another embodiment of the temperature control system of the acceleration tube using the heat pipe of the present invention, and FIG. 7 is a sectional view of the acceleration tube used in the temperature control system. The temperature control system of the present embodiment is characterized in that the cooling water is circulated and cooled, and in addition, the temperature is controlled by heating using an electric heater 25 installed directly on the acceleration tube 1. And The cooling water passing through the cooling water hole 11 penetrating the outer wall of the acceleration tube 1 in the axial direction is supplied to the electric heater 15 and the heat exchanger 19 based on the output of the temperature sensor 21 for measuring the temperature in the cooling water pipe 13. The temperature is adjusted by An electric heater 25 is further wrapped around the outer periphery of the accelerating tube 1, and the heater power supply 27 is adjusted based on the heater temperature or the output of a temperature sensor 29 for measuring the temperature of the accelerating tube 1 to control the temperature of the accelerating tube 1. Do.

Since the temperature distribution in the acceleration tube 1 is flattened by the action of the heat pipe or heat pipe structure 9 incorporated in the outer wall, each resonance cavity formed between the acceleration tube disks 3 has a predetermined size. , And the charged particles are accelerated stably. The electric heater 25 wound around the outer periphery of the accelerating tube 1 is arranged so that the heating wire reciprocates along substantially the same path, and the same current flows in the opposite direction so that the electric heater 25 has the same strength in both the forward and reverse directions. It is preferable to excite an electromagnetic field to suppress the generation of an electromagnetic field. If no electromagnetic field is generated in this way, the movement of the charged particles can be prevented from being disturbed without particularly using the electromagnetic shielding mechanism. According to the temperature control system for the acceleration tube of the present embodiment, since the temperature is controlled by using both cooling and heating, the heat of the acceleration tube 1 can be freely taken and temperature control with good responsiveness can be performed.

FIG. 8 is a block diagram showing another embodiment of the temperature control system of the acceleration tube using the heat pipe of the present invention. The temperature control system according to the present embodiment is characterized in that the temperature of the heat exchange unit connected to the acceleration tube 1 by a heat pipe is controlled to control the temperature of the acceleration tube 1. A part of the heat pipe 9 penetrating in the axial direction through the outer wall of the acceleration tube 1 is extended, and a pipe tip is thermally connected to the heat exchange unit 31. An electric heater 33 is incorporated in the heat exchanging unit 31 and receives electric power from a heater power supply 35. The temperature sensor 37 measures the temperature of the heat exchange unit 31,
Based on this output, the heat exchange unit 31
Temperature control is performed. The temperature of the acceleration tube 1 becomes equal to the temperature of the heat exchange unit 31 in a short time due to heat conduction through the heat pipe.

In this embodiment, the circulation of the cooling water is omitted, and the temperature adjustment depends on heating by the electric heater 33. Therefore, the temperature of the accelerating tube 1 is maintained at a level considerably higher than the ambient temperature. However, even if the temperature level of the accelerating tube 1 is somewhat high, if the temperature deviation is small and the fluctuation is small, it is possible to keep the dimensional accuracy of the accelerating tube 1 at a desired value. can do. It goes without saying that the temperature sensor 37 may be installed directly on the acceleration tube 1. Further, the heat pipe for making thermal contact with the heat exchanging section may be one or more or all of the heat pipes incorporated in the accelerating tube 1 or may be thermally connected to the outer wall portion of the accelerating tube 1. May be provided separately for the purpose.

[0030]

As described above in detail, according to the acceleration tube using the heat pipe of the present invention and the temperature control system thereof, the cooling water is used because the temperature distribution in the acceleration tube is flattened by the heat pipe or the heat pipe structure. Even if you use a simple temperature control system that omitted precise temperature control such as
Each resonance cavity maintains a predetermined size, and the charged particles are stably accelerated in the acceleration tube. For this reason, it is possible to construct a temperature control system which is much more economical than the conventional one.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of an acceleration tube using a heat pipe of the present invention.

FIG. 2 is a cross-sectional view of the accelerator tube, taken along a line II-II in FIG.

FIG. 3 is a block diagram illustrating a temperature control system for an acceleration tube using a heat pipe according to the present embodiment.

FIG. 4 is a transverse sectional view showing a second embodiment of the acceleration tube using the heat pipe of the present invention.

FIG. 5 is a block diagram showing a temperature control system of a third embodiment of the acceleration tube using the heat pipe of the present invention.

FIG. 6 is a block diagram illustrating a temperature control system according to a fourth embodiment of the acceleration tube using the heat pipe of the present invention.

FIG. 7 is a cross-sectional view of an acceleration tube according to a fourth embodiment.

FIG. 8 is a block diagram showing a temperature control system of a fifth embodiment of the acceleration tube using the heat pipe of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Acceleration tube 3 Acceleration tube disk 5 Resonance cavity 7 Beam passage hole 9 Heat pipe 11 Cooling water pipe 13 Cooling water channel 15 Electric heater 17 Heater power supply 19 Heat exchanger 21 Temperature sensor 23 Heat exchanger 25 Electric heat heater 27 Heater power supply 29 Temperature sensor 31 heat exchanger 33 electric heater 35 heater power supply 37 temperature sensor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Minoru Yokoyama 118 Notsuka, Noda-shi, Chiba Kawasaki Heavy Industries Noda Factory, Inc. (72) Inventor Akihiro Nakayama 118, Futatsuka, Noda-shi, Chiba Kawasaki Heavy Industries Noda, Ltd.

Claims (11)

[Claims] 1. An accelerating tube for use in a particle accelerator for accelerating charged particles to high energy, wherein the accelerating tube includes a heat pipe for transferring heat at least in the axial direction of the accelerating tube. 2. A tubular heat pipe is housed in a hole drilled in an axial direction in an outer wall of an acceleration tube.
An acceleration tube using the described heat pipe. 3. An acceleration tube using a heat pipe according to claim 1, wherein a tubular heat pipe is provided on the outer wall surface of the acceleration tube. 4. An acceleration tube using a heat pipe according to claim 1, wherein the outer wall of the acceleration tube has a double pipe structure, which is a heat pipe structure. 5. The heat pipe according to claim 1, wherein a cooling pipe for circulating the refrigerant in the axial direction is installed in a state of maintaining thermal contact with an outer wall of the acceleration pipe. Acceleration tube. 6. An acceleration tube using a heat pipe according to claim 1, wherein an electric heater is wound around the outer surface of the acceleration tube. 7. The electric heater according to claim 6, wherein the electric heater reciprocates through substantially the same path to cause a current to flow, thereby canceling out an electromagnetic field excited and suppressing the generation of an electromagnetic field. Acceleration tube using heat pipe. 8. An acceleration tube using a heat pipe according to claim 1, wherein the heat pipe or a part of the heat pipe structure is cooled or heated. 9. The heat pipe according to claim 1, further comprising a heat exchange section thermally connected to the heat pipe or the heat pipe structure by a heat pipe, wherein the heat exchange section is cooled or heated. An acceleration tube using the heat pipe according to any one of the above. 10. An accelerating device comprising a heat pipe, wherein a temperature sensor is further provided in contact with the accelerating tube using the heat pipe according to claim 1, and electric power applied to a heater is controlled based on an output of the temperature sensor. Temperature control system for accelerator tubes using heat pipes to control the temperature of the engine. 11. An accelerating tube using the heat pipe according to any one of claims 1 to 9, further comprising a temperature sensor in contact with the accelerating tube, and controlling electric power applied to the heater or cooling water temperature based on an output of the temperature sensor. Accelerator tube temperature control system that uses heat pipes to control the temperature of the accelerator tube.