JP2019004250A - High frequency transmission window body structure and high frequency input coupler - Google Patents

Abstract

To provide a high frequency input coupler capable of preventing a high frequency transmission window from cracking.SOLUTION: A high frequency input coupler 17 comprises: a high frequency transmission window 30 which has joint surfaces 35a, 35b; and an inner conductor sleeve 31a and an outer conductor sleeve 31b to which the joint surfaces 35a, 35b of the high frequency transmission window 30 are soldered. The inner conductor sleeve 31a and outer conductor sleeve 31b has: joint parts 39a, 39b which are provided to widths narrower than widths of the joint surfaces 35a, 35b of the high frequency transmission window 30 and to which width-directionally center parts 44a, 44b of the joint surfaces 35a, 35b are soldered; and groove parts 40a, 40b which are provided along both sides of the joint parts 39a, 39b and width-directionally outer parts 45a, 45b of the joint surface 35a, 35b projecting from both the sides of the joint parts 39a, 39b face. A depth dimension D1 of the groove parts 40a, 40b is smaller than a width dimension W3 of the width-directionally outer parts 45a, 45b of the joint surfaces 35a, 35b facing the groove parts 40a, 40b.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a high-frequency transmission window structure having a high-frequency transmission window that transmits high frequencies and a high-frequency input coupler.

  Conventionally, in a charged particle (electron, ion, proton) accelerator, when a high frequency emitted from a high frequency amplifier such as a klystron is incident on the acceleration cavity, a good coupling can be provided to the acceleration cavity. A high-frequency input coupler (coupler) having a structure is used.

  The high-frequency input coupler includes a high-frequency transmission window structure for allowing a high frequency incident from the atmosphere side to enter an acceleration cavity maintained in a high vacuum.

  The high-frequency transmission window structure includes a high-frequency transmission window that allows high-frequency transmission while maintaining airtightness, an outer conductor sleeve and an inner conductor sleeve that serve as a high-frequency transmission path, and the like. Joining surfaces provided on the outer periphery and inner periphery of the high-frequency transmission window are brazed and joined to the inner periphery of the outer conductor sleeve and the outer periphery of the inner conductor sleeve.

  A ceramic such as alumina is used for the high-frequency transmission window, and a metal such as copper is used for each sleeve.

  By the way, the high-frequency transmission window structure is exposed to a high temperature of 1000 ° C. or higher when assembled by brazing, and further, the high-frequency transmission window structure is heated to a high temperature of 700 ° C. or higher when each component of the high-frequency window structure and high-frequency input coupler is assembled by brazing. Exposed. At that time, since the thermal expansion coefficient of the material differs between the high frequency transmission window and each sleeve, tensile stress is generated in the high frequency transmission window when the temperature is increased or decreased during brazing. As a result, cracks may occur inside the high-frequency transmission window starting from the end of the joint surface of the high-frequency transmission window. When this crack penetrates the high-frequency transmission window, there is a problem that the high-frequency input coupler cannot be kept airtight.

JP 2015-141848 A

  The problem to be solved by the present invention is to provide a high-frequency transmission window structure and a high-frequency input coupler that can prevent cracks in the high-frequency transmission window.

  The high-frequency transmission window structure of this embodiment includes a high-frequency transmission window having a joint surface and a sleeve to which the joint surface of the high-frequency transmission window is brazed. The sleeve is provided with a width that is smaller than the width of the joint surface of the high-frequency transmission window, and a joint portion in which the center portion in the width direction of the joint surface is brazed and joined along both sides of the joint portion and protrudes from both sides of the joint portion. The outer surface of the joining surface in the width direction has an opposite groove. The depth dimension of the groove part is provided smaller than the width dimension of the width direction outer side part of the joint surface facing the groove part.

It is sectional drawing of a part of high frequency transmission window structure of the high frequency input coupler which shows one Embodiment. It is sectional drawing of a high frequency input coupler same as the above.

  Hereinafter, an embodiment will be described with reference to the drawings.

  FIG. 2 shows a cross-sectional view of the high-frequency input coupler 10.

  The high frequency input coupler 10 couples between the waveguide 11 that transmits a high frequency (microwave) radiated from a high frequency amplifier such as a klystron and the acceleration cavity 13 of the accelerator 12, and Is used to isolate the high pressure in the accelerating cavity 13 and the high frequency in the accelerating cavity 13.

  The high-frequency input coupler 10 includes a coupler main body 16 and a high-frequency transmission window structure 17 incorporated in the coupler main body 16.

  The coupler main body 16 has a columnar inner conductor 20 and a cylindrical outer conductor 21 that are arranged coaxially. High frequency is transmitted between the inner conductor 20 and the outer conductor 21. The inner conductor 20 is joined to the inner side of the high-frequency transmission window structure 17 and has an antenna portion 22 that protrudes from the acceleration cavity 13 of the accelerator 12. The outer conductor 21 is joined to the accelerator 12 at the outer side of the high-frequency transmission window structure 17.

  The high-frequency transmission window structure 17 includes a high-frequency transmission window 30 that is hermetically sealed and transmits high frequencies, and an inner conductor sleeve 31a and an outer conductor sleeve 31b as sleeves that constitute a transmission path.

  As a material of the high-frequency transmission window 30, for example, ceramic such as alumina is used. The high-frequency transmission window 30 is formed in a disc shape (annular shape) having a circular hole in the center.

  For example, a metal such as copper is used as the material of the inner conductor sleeve 31a and the outer conductor sleeve 31b. The inner conductor sleeve 31a and the outer conductor sleeve 31a are formed in a cylindrical shape and are arranged coaxially with the high-frequency transmission window 30 interposed therebetween.

  Then, the inner conductor sleeve 31a is inserted into the hole 33 of the high frequency transmission window 30, the high frequency transmission window 30 is inserted inside the outer conductor sleeve 31b, and the high frequency transmission window 30, the inner conductor sleeve 31a, and the outer conductor sleeve 31b are brazed. It is attached. The inner conductor sleeve 31a is brazed to the outer periphery of the inner conductor 20, and the outer conductor sleeve 31b is brazed to the end of the outer conductor 21.

  Next, FIG. 1 shows a partial cross-sectional view of the high-frequency transmission window structure 17.

  Joint surfaces (window-side joint surfaces) 35a and 35b that are brazed and joined to the outer peripheral surface of the inner conductor sleeve 31a and the inner peripheral surface of the outer conductor sleeve 31b are formed on the inner periphery and the outer periphery of the high-frequency transmission window 30. Inclined surfaces 36a and 36b, which are chamfered portions that are cut obliquely, are formed at the corners on both sides in the width direction of the inner periphery and outer periphery of the high-frequency transmission window 30. A metallized layer is formed on the joint surfaces 35a and 35b, and brazing materials 37a and 37b are provided on the metallized layer.

  On the outer peripheral surface of the inner conductor sleeve 31a, a joint portion 39a for brazing and joining the inner peripheral joint surface 35a of the high-frequency transmission window 30 is formed, and groove portions 40a are formed on both sides of the joint portion 39a. . On the inner peripheral surface of the outer conductor sleeve 31b, a joint portion 39b for brazing and joining the outer joint surface 35b of the high-frequency transmission window 30 is formed, and groove portions 40b are formed on both sides of the joint portion 39b. .

  In the joint portions 39a and 39b, sleep-side joint surfaces 41a and 41b to which the joint surfaces 35a and 35b of the high-frequency transmission window 30 are brazed are formed.

  The groove portions 40a and 40b have side surfaces 42a and 42b on both sides in the groove width direction, and bottom surfaces 43a and 43b on the groove back side. The side surfaces 42a and 42b are formed in an inclined shape so as to expand from the bottom surfaces 43a and 43b toward the opening side. The side surfaces of the joint portions 39a and 39b are constituted by the side surfaces 42a and 42b of the groove portions 40a and 40b, and the cross-sectional shapes of the joint portions 39a and 39b are trapezoidal.

  The width W1 of the joint portions 39a and 39b is provided smaller than the width W2 of the joint surfaces 35a and 35b of the high-frequency transmission window 30. Center portions 44a and 44b in the width direction of the joint surfaces 35a and 35b of the high-frequency transmission window 30 are brazed and joined to the joint portions 39a and 39b. Therefore, the width direction outer side portions 45a and 45b located on both sides of the width direction central portions 44a and 44b of the joint surfaces 35a and 35b of the high frequency transmitting window 30 are projected (exposed) from the joint portions 39a and 39b, and the groove portions 40a, It is arranged to face 40b.

  The depth dimension D1 of the groove portions 40a and 40b is set smaller than the width dimension W3 of the width direction outer side portions 45a and 45b of the joint surfaces 35a and 35b facing the groove portions 40a and 40b.

  Further, the brazing materials 37a and 37b are interposed between the joint portions 35a and 35b in the width direction of the high-frequency transmission window 30 and the sleep-side joint surfaces 41a and 41b of the joint portions 39a and 39b. ing.

  Part of the brazing material 37a, 37b has meniscus portions 47a, 47b between the width direction outer side portions 45a, 45b of the joint surfaces 35a, 35b of the high frequency transmission window 30 and the side surfaces 42a, 42b of the joint portions 39a, 39b. Forming. The meniscus portions 47a, 47b are thin on the end portions 48a, 48b side of the width direction outer side portions 45a, 45b of the joint surfaces 35a, 35b, and are end portions 48a of the width direction outer side portions 45a, 45b of the joint surfaces 35a, 35b, The thickness gradually increases from the 48b side toward the side surfaces 42a and 42b of the joint portions 39a and 39b, joined to the entire area of the side surfaces 42a and 42b of the joint portions 39a and 39b, and reaches the bottom surfaces 43a and 43b of the groove portions 40a and 40b. Yes.

  The high-frequency transmission window assembly 17 configured as described above is exposed to a high temperature of, for example, 1000 ° C. or more when assembled by brazing the high-frequency transmission window assembly 17 itself. When the parts of the vessel 10 are assembled by brazing, they are exposed to a high temperature of 700 ° C. or higher.

  At this time, the ceramic high frequency transmission window 30 and the copper inner conductor sleeve 31a and outer conductor sleeve 31b have different thermal expansion coefficients. Stress is likely to occur.

  If the entire width direction of the joint surfaces 35a and 35b of the high-frequency transmission window 30 is brazed to the inner conductor sleeve 31a and the outer conductor sleeve 31b, the end portions 48a and 48b of the joint surfaces 35a and 35b of the high-frequency transmission window 30 are As a starting point, a crack may occur toward the inside of the high-frequency transmission window 30.

  In the high frequency transmission window structure 17 of the present embodiment, the width W1 of the joint portions 39a and 39b of the inner conductor sleeve 31a and the outer conductor sleeve 31b is smaller than the width W2 of the joint surfaces 35a and 35b of the high frequency transmission window 30, and the joint portion 39a. , 39b are brazed to the width direction central portions 44a, 44b of the joint surfaces 35a, 35b of the high-frequency transmission window 30, and the depth dimension D1 of the groove portions 40a, 40b is the joint surface 35a facing the groove portions 40a, 40b. , 35b is provided smaller than the width dimension W3 of the outer side portions 45a, 45b in the width direction. As a result, the meniscus portions 47a and 47b of the brazing materials 37a and 37b formed between the width direction outer side portions 45a and 45b of the joint surfaces 35a and 35b of the high-frequency transmission window 30 and the side surfaces 42a and 42b of the joint portions 39a and 39b. The thicknesses of the end portions 48a and 48b of the width direction outer side portions 45a and 45b of the joint surfaces 35a and 35b are thin, and the joint portions 35a and 35b are joined from the end portions 48a and 48b side of the width direction outer side portions 45a and 45b. The thickness gradually increases toward the side surfaces 42a and 42b of 39a and 39b, and is joined to the entire area of the side surfaces 42a and 42b of the joint portions 39a and 39b and reaches the bottom surfaces 43a and 43b of the groove portions 40a and 40b. Therefore, the bonding area of the high-frequency transmission window 30 remains the same as before, and the bonding strength can be increased by dispersing and relaxing the stress applied to the end portions 48a and 48b of the bonding surfaces 35a and 35b of the high-frequency transmission window 30. it can. Thereby, it is possible to prevent cracks from occurring in the high-frequency transmission window 30.

  The brazed joint structure between the high-frequency transmission window 30 and the sleeve (the inner conductor sleeve 31a and the outer conductor sleeve 31b) of the high-frequency transmission window structure 17 is not limited to the high-frequency input coupler 10 described above. The wave electron tube can also be applied to a high-frequency transmission window structure provided in an output waveguide that outputs an amplified high frequency.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

10 High frequency input coupler
17 High-frequency transmission window structure
30 High-frequency transmission window
31a Inner conductor sleeve as sleeve
31b Outer conductor sleeve as sleeve
35a, 35b joint surface
37a, 37b Brazing material
39a, 39b joint
40a, 40b Groove
42a, 42b side
44a, 44b Center in the width direction
45a, 45b Width direction outer side
47a, 47b Meniscus section
48a, 48b end

Claims (4)

A high-frequency transmission window having a joint surface;
A sleeve to which the joint surface of the high-frequency transmission window is brazed,
The sleeve is provided with a width that is smaller than the width of the joint surface of the high-frequency transmission window and the width direction center portion of the joint surface is brazed and joined along both sides of the joint portion. The outer surface of the joint surface protruding from both sides of the joint portion has a groove portion facing the groove portion, and the depth dimension of the groove portion is smaller than the width dimension of the outer width portion of the joint surface facing the groove portion. A high-frequency transmission window structure characterized by that. A brazing material provided on the joint surface and brazed to the joint;
The brazing material gradually increases in thickness from an end portion of the widthwise outer side portion of the bonding surface toward a side surface of the bonding portion between the widthwise outer side portion of the bonding surface and the side surface of the bonding portion. The high-frequency transmission window structure according to claim 1, further comprising a meniscus portion bonded to the entire side surface of the bonding portion. A high-frequency transmission window that is annular and has joint surfaces on the outer periphery and inner periphery;
An inner conductor sleeve to which the joint surface of the inner periphery of the high-frequency transmission window is brazed,
An outer conductor sleeve to which the joint surface on the outer periphery of the high-frequency transmission window is brazed,
The inner conductor sleeve and the outer conductor sleeve are provided in a width smaller than the width of the joint surface of the high-frequency transmission window, and a joint portion in which a central portion in the width direction of the joint surface is brazed and joined. A widthwise outer portion of the joint surface that is provided along both sides and that has a groove portion facing the widthwise outer portion of the joint surface that protrudes from both sides of the joint portion, and the depth dimension of the groove portion faces the groove portion. A high frequency input coupler characterized in that it is provided smaller than the width dimension. A brazing material provided on the joint surface and brazed to the joint;
The brazing material gradually increases in thickness from an end portion of the widthwise outer side portion of the bonding surface toward a side surface of the bonding portion between the widthwise outer side portion of the bonding surface and the side surface of the bonding portion. The high frequency input coupler according to claim 3, further comprising a meniscus portion that is bonded to the entire side surface of the bonding portion.

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