JP2018166934A - Charged particle beam treatment device and power supply device - Google Patents

Abstract

To provide a charged particle beam treatment device and a power supply device, capable of improving accuracy in measuring a current value of a scanning electromagnet.SOLUTION: A shield 63 is in parallel with a core wire 61, which makes electric potential of the core wire 61 and that of the shield 63 equal to each other. Thereby, no current flows through a distribution capacitor C2 between the core wire 61 and the shield 63. On the other hand, current A2 flows through a distribution capacitor C2 between the shield 63 and an outside structure. The current A2 flows through the shield 63 but does not flow through the core wire 61. Thereby, the current A2 can be prohibited from flowing through a current measurement unit 51 connected with the core wire. The current measurement unit 51 can detect only current A3 flowing from the core wire 61 to a scanning electromagnet 6. Thereby, accuracy in measuring a current value of the scanning electromagnet 6 can be improved.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a charged particle beam therapy apparatus and a power supply apparatus.

  Conventionally, for example, an apparatus described in Patent Document 1 is known as a charged particle beam therapy apparatus that performs treatment by irradiating a patient's affected part with a charged particle beam. In the charged particle beam therapy apparatus described in Patent Document 1, a charged particle beam accelerated by an accelerator is scanned along a predetermined scanning path by a scanning electromagnet to irradiate an irradiated object (scanning method).

JP 2004-358237 A

  Here, the charged particle beam therapy system as described above stops the irradiation of the charged particle beam when an error occurs during the irradiation of the charged particle beam. For example, the following method may be employed as an operation when the irradiation of the charged particle beam is stopped in this way. In other words, the charged particle beam therapy system may store the stop position of the charged particle beam in the scanning path at the time of stop, and start irradiation of the charged particle beam from the stored stop position after the error is resolved. is there. As described above, in order to resume irradiation of the charged particle beam from an accurate position, it is necessary to accurately grasp the stop position of the charged particle beam. Here, the stop position of the charged particle beam can be indirectly grasped from the current value of the scanning electromagnet. In the conventional charged particle beam therapy system, there is room for improving the measurement accuracy of the current value of the scanning electromagnet in order to accurately grasp the stop position of the charged particle beam.

  Accordingly, an object of the present invention is to provide a charged particle beam therapy apparatus and a power supply apparatus that can improve the measurement accuracy of the current value of a scanning electromagnet.

  In order to solve the above problems, a charged particle beam therapy apparatus according to the present invention is a charged particle beam therapy apparatus that irradiates an object to be irradiated with a charged particle beam, and includes a scanning electromagnet that scans a charged particle beam, and a scanning electromagnet. An electromagnet power source for supplying electric power, a first line connecting the electromagnet power source and the scanning electromagnet, and a first line connected to the first line are provided so as to cover the periphery of the first line. Thus, the current of the first line is connected to the first line on the scanning electromagnet side of the second line in parallel with the first line and the connection portion between the first line and the second line. A current measuring unit that measures the current.

  The charged particle beam therapy system according to the present invention includes a first line connecting an electromagnet power source and a scanning electromagnet, and a second line provided so as to cover the periphery of the first line. Since the second line covers the periphery of the first line, a distributed capacitance is formed between the first line and the second line. A distributed capacity is formed between the second line on the outer peripheral side and the external structure. Here, since the second line is parallel to the first line, the first line and the second line have the same potential. Therefore, no current flows through the distributed capacitance between the first line and the second line. On the other hand, a current flows through the distributed capacitance between the second line and the external structure. However, the current flows through the second line, but does not flow through the first line. Therefore, the current measured by the current measurement unit connected to the first line on the scanning electromagnet side with respect to the connection part between the first line and the second line is measured between the second line and the external structure. It is possible to prevent the current flowing to the distributed capacitance from being included. Thereby, the measurement accuracy of the current value of the scanning electromagnet can be improved.

  The charged particle beam therapy system according to the present invention is provided between the first line and the second line on the scanning electromagnet side with respect to the connection portion, and insulates the first line from the second line. And a second insulating material provided so as to cover the periphery of the second line, and the second insulating material may be connected to an installation potential member that is an installation potential. Thereby, it is possible to suitably insulate the first line and the entire second line while improving the measurement accuracy of the current value of the scanning electromagnet.

  A power supply apparatus according to the present invention is a power supply apparatus that supplies power to a scanning electromagnet that scans a charged particle beam irradiated to an irradiated object, and includes an electromagnet power supply that supplies power to the scanning electromagnet, an electromagnet power supply, and a scanning electromagnet A first line for connecting the first line and the first line so as to cover the periphery of the first line, and one end on the electromagnet power supply side is connected to the first line so as to be in parallel with the first line. And a current measuring unit connected to the first line on the scanning electromagnet side with respect to the connecting part between the first line and the second line and measuring the current of the first line.

  According to this power supply device, the same operation and effect as the above-mentioned charged particle beam therapy system can be obtained.

  The power supply device according to the present invention is provided between the first line and the second line on the scanning electromagnet side with respect to the connection portion, and a first insulating material that insulates the first line from the second line. And a second insulating material provided so as to cover the periphery of the second line, and the second insulating material may be connected to an installation potential member that is an installation potential. Thereby, it is possible to suitably insulate the first line and the entire second line while improving the measurement accuracy of the current value of the scanning electromagnet.

  According to the present invention, the measurement accuracy of the current value of the scanning electromagnet can be improved.

1 is a schematic configuration diagram of a charged particle beam therapy system according to an embodiment of the present invention. It is a schematic block diagram of the irradiation part vicinity of the charged particle beam therapy apparatus of FIG. It is a figure which shows the layer set with respect to the tumor. It is a schematic diagram which shows the structure of the connection part vicinity of the electromagnet power supply and cable of the power supply device which concerns on this embodiment. It is a cross section of the cable of the power supply device which concerns on this embodiment. It is a circuit diagram of the power supply device concerning this embodiment. It is a circuit diagram of the power supply device which concerns on a comparative example.

  Hereinafter, a charged particle beam therapy system according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 1, a charged particle beam therapy apparatus 1 according to an embodiment of the present invention is an apparatus used for cancer treatment or the like by radiation therapy, and charged particles generated by an ion source (not shown). An accelerator 3 that emits the charged particle beam as a charged particle beam, an irradiation unit 2 that irradiates the irradiated object with the charged particle beam, and a beam transport line 41 that transports the charged particle beam emitted from the accelerator 3 to the irradiation unit 2. It is equipped with. The irradiation unit 2 is attached to a rotating gantry 5 provided so as to surround the treatment table 4. The irradiation unit 2 can be rotated around the treatment table 4 by a rotating gantry 5.

  FIG. 2 is a schematic configuration diagram in the vicinity of the irradiation unit of the charged particle beam therapy system of FIG. In the following description, the terms “X direction”, “Y direction”, and “Z direction” will be used. The “Z direction” is a direction in which the base axis AX of the charged particle beam B extends, and is a depth direction of irradiation of the charged particle beam B. The “base axis AX” is an irradiation axis of the charged particle beam B when it is not deflected by a scanning electromagnet 6 described later. FIG. 2 shows a state in which the charged particle beam B is irradiated along the base axis AX. The “X direction” is one direction in a plane orthogonal to the Z direction. The “Y direction” is a direction orthogonal to the X direction in a plane orthogonal to the Z direction.

  First, a schematic configuration of the charged particle beam therapy apparatus 1 according to the present embodiment will be described with reference to FIG. The charged particle beam therapy apparatus 1 is an irradiation apparatus according to a scanning method. The scanning method is not particularly limited, and line scanning, raster scanning, spot scanning, or the like may be employed. As shown in FIG. 2, the charged particle beam therapy system 1 includes an accelerator 3, an irradiation unit 2, a beam transport line 41, and a control unit 7.

  The accelerator 3 is a device that accelerates charged particles and emits a charged particle beam B having a preset energy. Examples of the accelerator 3 include a cyclotron, a synchrotron, a synchrocyclotron, a linac, and the like. When a cyclotron that emits a charged particle beam B having a predetermined energy is used as the accelerator 3, the energy adjusting unit 20 is used to adjust (decrease) the energy of the charged particle beam B sent to the irradiation unit 2. It becomes possible to make it. Since the synchrotron can easily change the energy of the emitted charged particle beam B, when the synchrotron is used as the accelerator 3, the energy adjusting unit 20 may be omitted. The accelerator 3 is connected to the control unit 7 and the supplied current is controlled. The charged particle beam B generated by the accelerator 3 is transported to the irradiation nozzle 9 by the beam transport line 41. The beam transport line 41 connects the accelerator 3, the energy adjustment unit 20, and the irradiation unit 2, and transports the charged particle beam B emitted from the accelerator 3 to the irradiation unit 2.

  The charged particle beam treatment apparatus 1 further includes a beam chopper 16 that is disposed in the accelerator 3 and that blocks the charged particle beam B emitted from the ion source. In the operating state (ON) of the beam chopper 16, the charged particle beam B emitted from the ion source is blocked and is not emitted from the accelerator 3. When the beam chopper 16 is stopped (OFF), the charged particle beam B emitted from the ion source is emitted from the accelerator 3 without being blocked. The operation state and the stop state of the beam chopper 16 are switched by a beam chopper switch (not shown). A means other than a beam chopper may be used as a means for switching between irradiation and non-irradiation of charged particle beams. For example, a shutter may be provided in the beam transport line, and the charged particle beam may be blocked by the shutter. Alternatively, the charged particle beam may be emitted from the accelerator 3 only when the charged particle beam is irradiated using a deflector (electrode) provided in the accelerator 3.

  The irradiation unit 2 irradiates the tumor (irradiated body) 14 in the body of the patient 15 with the charged particle beam B. The charged particle beam B is obtained by accelerating charged particles at high speed, and examples thereof include a proton beam, a heavy particle (heavy ion) beam, and an electron beam. Specifically, the irradiation unit 2 is an apparatus that irradiates the tumor 14 with a charged particle beam B emitted from an accelerator 3 that accelerates charged particles generated by an ion source (not shown) and transported by a beam transport line 41. . The irradiation unit 2 includes a scanning electromagnet 6, a quadrupole electromagnet 8, a profile monitor 11, a dose monitor 12, flatness monitors 13a and 13b, and a degrader 30. The scanning electromagnet 6, the monitors 11, 12, 13 a, 13 b, the quadrupole electromagnet 8, and the degrader 30 are accommodated in the irradiation nozzle 9. The quadrupole electromagnet 8, the profile monitor 11, the dose monitor 12, the flatness monitors 13a and 13b, and the degrader 30 may be omitted.

  The scanning electromagnet 6 includes an X-direction scanning electromagnet 6a and a Y-direction scanning electromagnet 6b. The X-direction scanning electromagnet 6a and the Y-direction scanning electromagnet 6b are each composed of a pair of electromagnets, change the magnetic field between the pair of electromagnets according to the current supplied from the control unit 7, and pass between the electromagnets. Scan line B. The X direction scanning electromagnet 6a scans the charged particle beam B in the X direction, and the Y direction scanning electromagnet 6b scans the charged particle beam B in the Y direction. These scanning electromagnets 6 are arranged in this order on the base axis AX and downstream of the accelerator 3 from the charged particle beam B.

  The quadrupole electromagnet 8 includes an X-direction quadrupole electromagnet 8a and a Y-direction quadrupole electromagnet 8b. The X-direction quadrupole electromagnet 8 a and the Y-direction quadrupole electromagnet 8 b converge and focus the charged particle beam B according to the current supplied from the control unit 7. The X direction quadrupole electromagnet 8a converges the charged particle beam B in the X direction, and the Y direction quadrupole electromagnet 8b converges the charged particle beam B in the Y direction. The beam size of the charged particle beam B can be changed by changing the current supplied to the quadrupole electromagnet 8 to change the aperture amount (convergence amount). The quadrupole electromagnet 8 is disposed in this order on the base axis AX and between the accelerator 3 and the scanning electromagnet 6. The beam size is the size of the charged particle beam B on the XY plane. The beam shape is the shape of the charged particle beam B on the XY plane.

  The profile monitor 11 detects the beam shape and position of the charged particle beam B for alignment at the time of initial setting. The profile monitor 11 is disposed on the base axis AX and between the quadrupole electromagnet 8 and the scanning electromagnet 6. The dose monitor 12 detects the intensity of the charged particle beam B. The dose monitor 12 is disposed downstream of the scanning electromagnet 6 on the base axis AX. The flatness monitors 13a and 13b detect and monitor the beam shape and position of the charged particle beam B. The flatness monitors 13 a and 13 b are arranged on the base axis AX and downstream of the charged particle beam B from the dose monitor 12. Each monitor 11, 12, 13 a, 13 b outputs the detected detection result to the control unit 7.

  The degrader 30 finely adjusts the energy of the charged particle beam B by reducing the energy of the charged particle beam B passing therethrough. In the present embodiment, the degrader 30 is provided at the distal end portion 9 a of the irradiation nozzle 9. The tip 9a of the irradiation nozzle 9 is the end on the downstream side of the charged particle beam B.

  The control part 7 is comprised by CPU, ROM, RAM, etc., for example. The control unit 7 controls the accelerator 3, the scanning electromagnet 6, and the quadrupole electromagnet 8 based on the detection results output from the monitors 11, 12, 13a, and 13b. Moreover, in this embodiment, the control part 7 feeds back the detection result of each monitor 11, 12, 13a, 13b, and controls the quadrupole electromagnet 8 so that the beam size of the charged particle beam B becomes constant. .

  The control unit 7 of the charged particle beam therapy apparatus 1 is connected to a treatment planning apparatus 100 that performs a treatment plan for charged particle beam therapy. The treatment planning apparatus 100 measures the tumor 14 of the patient 15 by CT or the like before the treatment, and plans a dose distribution (a dose distribution of a charged particle beam to be irradiated) at each position of the tumor 14. Specifically, the treatment planning apparatus 100 creates a treatment plan map for the tumor 14. The treatment planning apparatus 100 transmits the created treatment plan map to the control unit 7.

  When performing charged particle beam irradiation by the scanning method, the tumor 14 is virtually divided into a plurality of layers in the Z direction, and the charged particle beam is scanned and irradiated in one layer so as to follow the scanning path determined in the treatment plan. To do. Then, after the irradiation of the charged particle beam in the one layer is completed, the charged particle beam is irradiated in the next adjacent layer.

  When the charged particle beam therapy apparatus 1 shown in FIG. 2 irradiates the charged particle beam B by the scanning method, the quadrupole electromagnet 8 is turned on (ON) so that the passing charged particle beam B converges.

  Subsequently, a charged particle beam B is emitted from the accelerator 3. The emitted charged particle beam B is scanned by the scanning electromagnet 6 so as to follow the scanning path determined in the treatment plan. Accordingly, the charged particle beam B is irradiated while being scanned within the irradiation range in one layer set in the Z direction with respect to the tumor 14. When the irradiation of one layer is completed, the charged particle beam B is irradiated to the next layer.

  The charged particle beam irradiation image of the scanning electromagnet 6 according to control of the control part 7 is demonstrated with reference to Fig.3 (a) and (b). 3A shows an irradiation object virtually sliced into a plurality of layers in the depth direction, and FIG. 3B shows a scanning image of a charged particle beam in one layer viewed from the depth direction. , Respectively.

As shown in FIG. 3A, the irradiated object is virtually sliced into a plurality of layers in the irradiation depth direction, and in this example, from the deep layer (the range of the charged particle beam B is long). In order, the layer is virtually sliced into a layer L ₁ , a layer L ₂ ,... A layer L _n−1 , a layer L _n , a layer L _{n + 1} , a layer L _N−1 , a layer L _N, and an N layer. Further, as shown in FIG. 3 (b), the charged particle beam B is irradiated to a plurality of irradiation spots of the layer L _n while drawing the beam trajectory TL (scan path). That is, the irradiation unit 2 is controlled by the control unit 7, and the charged particle beam B irradiated from the irradiation unit 2 moves on the beam trajectory TL.

  When an error occurs during irradiation of the charged particle beam B, the control unit 7 stops the irradiation of the charged particle beam B. The control unit 7 stops the emission of the charged particle beam B from the accelerator 3 by turning on the beam chopper 16. And the control part 7 memorize | stores the stop position of the charged particle beam B at the time of a stop. After the error is eliminated, the control unit 7 starts the irradiation of the charged particle beam B from the stored stop position. In addition, an error is detecting an abnormal value with one of the monitors provided in the charged particle beam therapy system 1. The monitor is, for example, a detector that monitors the output (current value) of ions from the ion source, a detector that monitors the output of the charged particle beam B from the accelerator 3, various monitors in the irradiation nozzle 9, and the movement of the patient. Examples include detectors for detection. The stopping of the charged particle beam B is not limited to that by the beam chopper 16 but may be by another method. For example, a shutter may be provided in the beam transport line 41 and the charged particle beam B may be physically shielded by the shutter.

  Here, the charged particle beam therapy system 1 includes a power supply device 150 that supplies power to the scanning electromagnet 6 that scans the charged particle beam B irradiated to the tumor 14. The power supply device 150 includes an electromagnet power supply 50 that supplies power to the scanning electromagnet 6, a cable 60 that connects the electromagnet power supply 50 and the scanning electromagnet 6, and a current measurement unit 51 that measures current. The cable 60 is wound around from the back side of the rotating gantry 5 and is accommodated in a winding portion 55 provided on the back side of the rotating gantry 5 (see FIG. 1). The cable 60 is traversed inside the rotating gantry 5 along a predetermined path and is connected to the scanning electromagnet 6 of the irradiation unit 2.

  A detailed configuration of the power supply apparatus 150 will be described with reference to FIGS. FIG. 4 is a schematic diagram illustrating a configuration in the vicinity of a connection portion between the electromagnet power supply 50 and the cable 60 of the power supply device 150. FIG. 5 is a cross section of the cable 60. FIG. 6 is a circuit diagram of the power supply device 150.

  4 and 5, the cable 60 includes a core wire (first wire) 61, an insulating material (first insulating material) 62, a shield (second wire) 63, and an insulating material ( Second insulating material) 64.

  The core wire 61 is made of a conductive material, and connects the electromagnet power supply 50 and the scanning electromagnet 6. In the electromagnet power supply 50, the core wire 61 is connected to an output terminal (connection portion) 52 that supplies power. The periphery of the core wire 61 is covered with an insulating material 62. Thereby, the core wire 61 is insulated from the shield 63 in the cable 60.

  The shield 63 is provided so as to cover the periphery of the core wire 61. The shield 63 is made of, for example, a conductive mesh member. One end of the shield 63 is connected to the first line, so that the shield 63 is in parallel with the first line (see FIG. 6). The end of the shield 63 on the electromagnet power supply 50 side is connected to the core wire 61 via the output terminal 52 in the electromagnet power supply 50. On the other hand, the shield 63 is not connected to the core wire 61 at the end of the shield 63 on the scanning electromagnet 6 side. That is, the shield 63 is not connected to the core wire 61 on the scanning electromagnet 6 side than the connection part on the electromagnet power supply 50 side. With such a configuration, the shield 63 has the same potential as the core wire 61. The periphery of the shield 63 is covered with an insulating material 64. Thereby, in the cable 60, the shield 63 is insulated from the outside.

  As shown in FIG. 4, the insulating material 64 is removed from the cable 60 at the end on the electromagnet power supply 50 side. Further, the core wire 61 and the extension 63a of the shield 63 are in a state of being separated from each other. In such a state, the current measuring unit 51 is connected to the core wire 61. The current measuring unit 51 is connected to the core wire on the scanning electromagnet 6 side than the output terminal 52 that is a connection portion between the core wire 61 and the shield 63. The current measuring unit 51 measures the current of the core wire 61. On the other hand, the extension 63 a of the shield 63 extends to bypass the current measurement unit 51 and is connected to the output terminal 52. As a result, the current measuring unit 51 can detect only the current flowing through the core wire 61 without detecting the current flowing through the shield 63.

  With the configuration as described above, the insulating material 62 is provided between the core wire 61 and the shield 63 on the scanning electromagnet 6 side of the output terminal 52 that is a connection portion between the core wire 61 and the shield 63. And the shield 63 are insulated. The insulating material 64 is provided so as to cover the periphery of the shield 63. The insulating material 64 is connected to an installation potential member that is an installation potential. In the present embodiment, the installation potential member is, for example, an external structure such as the installation surface 80 of the cable rack. That is, when the cable 60 is installed on the installation surface 80, the insulating material 64 is connected to the installation potential member.

  Next, the circuit configuration of the power supply device 150 will be described with reference to FIG. As shown in FIG. 6, the core wire 61 extends from the output terminal 52 of the electromagnet power supply 50 to the load 70 (here, the scanning electromagnet 6). A shield 63 having the same potential as that of the core wire 61 extends from the output terminal 52. The core wire 61 has a predetermined inductance L1. The shield 63 has a predetermined inductance L2.

  The core wire 61 and the shield 63 are adjacent to each other in the radial direction with the insulating material 62 interposed therebetween. Accordingly, a distributed capacitance C1 is formed between the core wire 61 and the shield 63. The shield 63 is disposed on the outer peripheral side of the core wire 61 and is adjacent to an external structure via the insulating material 64. The external structure is, for example, a cable rack installation surface 80 (see FIG. 5). Such a structure functions as a ground G for the shield 63. As a result, a distributed capacitance C2 is formed between the shield 63 and the ground G.

  Next, operations and effects of the charged particle beam therapy apparatus 1 and the power supply apparatus 150 according to the present embodiment will be described.

  First, a power supply device 200 according to a comparative example will be described with reference to FIG. The power supply device 200 does not have the shield 63 like the power supply device 150 of the present embodiment. Accordingly, a capacitance distribution C3 is formed between the core wire 61 and the external structure. In this state, in addition to the current A2 that flows to the scanning electromagnet 6, a current A1 that flows to the capacitance distribution C3 is also generated in the core wire 61. Therefore, the current A1 also flows through the current measuring unit 51. In this case, irradiation of the charged particle beam is stopped due to an error, and when starting irradiation from the stop position, a current A1 flowing to the capacitance distribution C3 is generated, and the current measuring unit 51 also measures the current A1. As a result, an error occurs in the measurement result of the current measuring unit 51. Thus, if an error occurs in the measurement result, the current value to the scanning electromagnet 6 when the irradiation of the charged particle beam is stopped cannot be accurately detected. This causes a problem that the stop position of the charged particle beam cannot be accurately grasped.

  On the other hand, the charged particle beam therapy apparatus 1 and the power supply apparatus 150 according to the present embodiment include a core wire 61 that connects the electromagnet power source 50 and the scanning electromagnet 6, and a shield 63 that is provided so as to cover the periphery of the core wire 61. Is provided. Since the shield 63 covers the periphery of the core wire 61, a distributed capacitance C <b> 1 is formed between the core wire 61 and the shield 63. In addition, a distributed capacitance C2 is formed between the outer shield 63 and the external structure. Here, since the shield 63 is in parallel with the core wire 61, the core wire 61 and the shield 63 have the same potential. Therefore, no current flows through the distributed capacitance C1 between the core wire 61 and the shield 63. On the other hand, a current A2 flows through the distributed capacitance C2 between the shield 63 and the external structure. However, the current A2 flows through the shield 63 but does not flow through the core wire 61. Therefore, the current A2 can be prevented from flowing through the current measuring unit 51 connected to the core wire. The current measuring unit 51 can detect only the current A <b> 3 flowing from the core wire 61 to the scanning electromagnet 6. Thereby, the measurement accuracy of the current value of the scanning electromagnet 6 can be improved. When the measurement accuracy can be improved in this way, the current value to the scanning electromagnet 6 when the irradiation of the charged particle beam is stopped can be accurately detected. Thereby, the stop position of a charged particle beam can be grasped correctly.

  The charged particle beam therapy apparatus 1 and the power supply apparatus 150 according to the present embodiment are provided between the core wire 61 and the shield 63 on the scanning electromagnet 6 side with respect to the output terminal 52 that is a connection portion, and the core wire 61 and the shield 63. And an insulating material 62 for insulating the shield 63 and 64 provided so as to cover the periphery of the shield 63. The insulating material 64 is connected to an installation surface (installation potential member) 80 that is an installation potential. Thereby, it is possible to suitably insulate the entire cable 60 (the core wire 61 and the shield 63) while improving the measurement accuracy of the current value of the scanning electromagnet 6.

  The present invention is not limited to the embodiment described above.

  For example, the structure and connection mode of the power supply device 150 and the cable 60 are not limited to the above-described embodiments, and may be appropriately changed within the scope of the gist of the present invention.

  Moreover, the structure of the irradiation part 2 is not limited to what is shown in FIG. 2, It can change suitably.

  DESCRIPTION OF SYMBOLS 1 ... Charged particle beam therapy apparatus, 2 ... Irradiation part, 3 ... Accelerator, 6 ... Scanning magnet, 14 ... Tumor (irradiation body), 50 ... Electromagnet power supply, 51 ... Current measurement part, 52 ... Output terminal (connection part) 61 ... Core wire (first wire), 62 ... Insulating material (first insulating material), 63 ... Shield (second wire), 64 ... Insulating material (second insulating material), 80 ... Installation surface (Installation potential member), 150... Power supply device.

Claims (4)

A charged particle beam therapy apparatus for irradiating an irradiated body with a charged particle beam,
A scanning electromagnet for scanning the charged particle beam;
An electromagnet power supply for supplying power to the scanning electromagnet;
A first line connecting the electromagnet power source and the scanning electromagnet;
A second line that is provided so as to cover the periphery of the first line, and is connected in parallel with the first line by connecting one end of the electromagnet power source to the first line;
A current measuring unit connected to the first line on the side of the scanning electromagnet with respect to the connecting part between the first line and the second line, and measuring a current of the first line. Particle beam therapy device. A first insulating material provided between the first line and the second line on the scanning electromagnet side with respect to the connection portion, and insulating the first line and the second line;
A second insulating material provided to cover the periphery of the second line,
The charged particle beam therapy apparatus according to claim 1, wherein the second insulating material is connected to an installation potential member that is an installation potential. A power supply device that supplies power to a scanning electromagnet that scans a charged particle beam irradiated to an irradiation object,
An electromagnet power supply for supplying power to the scanning electromagnet;
A first line for connecting the electromagnet power source and the scanning electromagnet;
A second line that is provided so as to cover the periphery of the first line, and is connected in parallel to the first line by connecting one end of the electromagnet power source to the first line;
A power source comprising: a current measuring unit that is connected to the first line on the side of the scanning magnet relative to a connecting part between the first line and the second line, and that measures a current of the first line; apparatus. A first insulating material provided between the first line and the second line on the scanning electromagnet side with respect to the connection portion, and insulating the first line and the second line;
A second insulating material provided to cover the periphery of the second line,
The power supply device according to claim 3, wherein the second insulating material is connected to an installation potential member that is an installation potential.

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