JPH0686300U - Current detector in particle accelerator - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a current detector that can be attached and detached without disassembling the vacuum chamber. [Structure] A pair of units 21 and 21 are fastened to each other to form an annular shape as a whole. A connector 2 for mechanically fastening the units to each other, and electrically connecting the coils 24 wound around the cores 23 to the fastening portions of the units.
2 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a current detector provided in a particle accelerator such as a synchrotron.

[0002]

[Prior art]

 In recent years, SOR light (synchrotron radiation) emitted from particle accelerators such as synchrotrons is extracted and used as a light source in various fields such as VLSI manufacturing, diagnosis in the medical field, molecular analysis, structural analysis, etc. There is a momentum to use it, and facilities for it are being developed.

FIG. 2 shows an outline of a small synchrotron for utilizing SOR light. In this synchrotron, electrons generated by an electron generator 1 such as an electron gun are driven into a vacuum chamber 5 that constitutes an incident path, and are accelerated by a linear accelerator (linac) 2 to a speed close to the speed of light. The light is deflected and enters through the inflator 4 into the vacuum chamber 5 forming the storage ring. The electrons that have entered the vacuum chamber 5 forming the storage ring are converged by the converging electromagnet 7 while being given energy by the high-frequency accelerating cavity 6, are deflected by the deflecting electromagnet 8 and continue to orbit the vacuum chamber 5. . Then, when deflected by the deflecting electromagnet 8, SOR light is generated, which is emitted to, for example, the exposure device 10 via the beam line 9 which is a light extraction line and used.

In the synchrotron as described above, a current detector 11 for measuring the value of the current flowing in the vacuum chamber 5 when electrons pass through the vacuum chamber 5 that constitutes the incident path and the storage ring. A so-called CT (current transfomer) is mounted at an appropriate position (not shown in Fig. 2). As shown in FIG. 3, the current detector 11 is of a form in which a coil 13 is wound around an annular core 12 and the whole is covered with a case 14, and the vacuum chamber 5 is inserted through the center thereof. It is used by being attached to the outside of the vacuum chamber 5.

[0005]

[Problems to be solved by the device]

 By the way, when the above current detector 11 is attached to or removed from the vacuum chamber 5, for example, when the current detector 11 fails and is repaired or replaced, or when the installation position is changed, the current Since the detector 11 has an annular shape, the vacuum chamber 5 must be disassembled. However, since the vacuum chamber 5 is maintained in an ultra-high vacuum, it is naturally necessary to completely break the vacuum state in order to dismantle it. In order to obtain a high vacuum, it is necessary to perform baking for a long time and then vacuum evacuation, which requires a great deal of time and money for restoration.

The present invention has been made in view of the above circumstances, and provides an effective current detector that can be attached to and removed from a vacuum chamber extremely easily without disassembling the vacuum chamber. The purpose is to do.

[0007]

[Means for Solving the Problems]

 The present invention is a current detector configured to have a coil wound around an annular core, which is attached to a vacuum chamber of a particle accelerator and used to detect a current value flowing in the vacuum chamber. When a pair of units are fastened to each other, they are formed into an annular shape as a whole, and at the fastening portion between these units, the coils that are mechanically fastened to each other and are wound around their respective cores. The feature is that a connector is provided for electrically connecting the two.

[0008]

[Action]

 The current detector of the present invention is a conventional annular current detector divided into two parts. When assembled by connecting a pair of units with a connector, it becomes an annular current detector, and at the same time, The coils wound around the core are also electrically connected by the connector. The current detector is attached to the vacuum chamber by fastening both disassembled units with the vacuum chamber sandwiched between them, and the removal is performed by releasing the fastening by the connector and disassembling both units. . Therefore, it is not necessary to disassemble the vacuum chamber when attaching or detaching the current detector.

[0009]

【Example】

 FIG. 1 shows a current detector 20 which is an embodiment of the present invention. The current detector 20 is formed into an annular shape as a whole by coupling a pair of units 21 and 21 each having a substantially semi-arcuate shape with connectors 22 and 22. Each unit 21 is composed of a substantially semi-arc-shaped core 23, a coil 24 wound around the core 23, and a case 25 that covers them all. The connectors 22 and 22 are designed to mechanically fasten and electrically connect the units 21 and 21.

That is, a connector ring 26 having a female screw formed on the inner surface is rotatably provided at one end of each unit 21, and a male screw portion 27 to which the connector ring 26 is screwed is formed at the other end. Has been done. Further, an electrode pin 28 connected to the coil 24 is provided inside the connector ring 26, and an insert inserted into the male screw portion 27 so that the electrode pin 28 is inserted while being connected to the beam coil 24. A hole 29 is provided. Then, the connector ring 26 is attached to the male screw portion 27 and screwed to mechanically fasten the units 21 and 21 to each other to form an annular shape as a whole. At that time, the electrode pin 28 is automatically inserted into the insertion hole 29. The coils 24, 24 of both units 21, 21 are electrically connected to each other.

The current detector 20 having the above structure can be easily divided into two parts by operating the connectors 22 and 22 and can be assembled into an annular shape. Therefore, the vacuum chamber 5 of the particle accelerator is disassembled. It can be easily installed and easily removed without doing so. Therefore, it is not necessary to dismantle the vacuum chamber 5 as in the conventional case, and it is of course possible to completely break down the vacuum in the vacuum chamber 5 and to save a great deal of trouble for restoration thereof.

[0012]

[Effect of device]

 As described above, the current detector of the present invention is configured such that a pair of units are mechanically and electrically fastened to the connector, and can be easily divided into two parts only by operating the connector. And because it can be assembled in a ring, it can be easily installed without disassembling the vacuum chamber of the particle accelerator, and it can be easily removed, and therefore, when using a conventional current detector. This eliminates the need for disassembling or reassembling the vacuum chamber when mounting or dismounting, and as a result, it has the excellent effect of breaking the vacuum in the vacuum chamber and completely eliminating the labor of restoration.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a current detector that is an embodiment of the present invention.

FIG. 2 is a diagram showing an outline of a synchrotron.

FIG. 3 is a schematic configuration diagram of a conventional general current detector.

[Explanation of symbols]

 5 vacuum chamber 20 current detector 21 unit 22 connector 23 core 24 coil 25 case 26 connector ring 27 female screw part 28 electrode pin 29 insertion hole.

Claims (1)

[Scope of utility model registration request] 1. A current detector having a structure in which a coil is wound around an annular core, which is attached to a vacuum chamber of a particle accelerator and used to detect a current value flowing in the vacuum chamber. The pair of units are fastened to each other to form an annular shape as a whole, and the fastening portions of the units are mechanically fastened to each other and the coils wound around the respective cores are fastened to each other. A current detector in a particle accelerator, characterized in that a connector for electrical connection is provided.