WO2022014685A1 - 電磁場制御用部材 - Google Patents
電磁場制御用部材 Download PDFInfo
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- WO2022014685A1 WO2022014685A1 PCT/JP2021/026677 JP2021026677W WO2022014685A1 WO 2022014685 A1 WO2022014685 A1 WO 2022014685A1 JP 2021026677 W JP2021026677 W JP 2021026677W WO 2022014685 A1 WO2022014685 A1 WO 2022014685A1
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- rod
- electromagnetic field
- field control
- axial direction
- control member
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—HANDLING OF PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/08—Deviation, concentration or focusing of the beam by electric or magnetic means
- G21K1/087—Deviation, concentration or focusing of the beam by electric or magnetic means by electrical means
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
Definitions
- the present disclosure relates to an electromagnetic field control member used in an accelerator or the like for accelerating charged particles such as electrons and heavy particles.
- Non-Patent Document 1 Ceramic Chamber integrated pulse magnet (Ceramics Chamber with integrated Pulsed-Magnet, hereinafter referred to as CCiPM) (Non-Patent Document 1). ..
- CCiPM is provided with a cylindrical insulating member made of ceramics, formed along the axial direction of the insulating member, and a substrate-shaped conductive member is embedded in a through hole penetrating the thickness direction of the insulating member.
- the conductive member acts as a part of a partition wall that separates the inside and the outside of the insulating member, and secures the airtightness inside the insulating member.
- Applicants have previously made an insulating member made of cylindrical ceramics and having a plurality of through holes along the axial direction in order to maintain the airtightness of the space located inside the insulating member for a long period of time.
- a conductive member that closes the through hole so as to have an opening that opens on the outer periphery of the insulating member made of metal, and a feeding terminal connected to the conductive member.
- the feeding terminal is the insulation that forms the through hole.
- Electromagnetic field control that is separated from the inner wall of the member, has a first end and a second end in the axial direction, and at least one of the first and second ends is farther from the inner wall than the central portion of the feeding terminal.
- Patent Document 1 A member for use is proposed (Patent Document 1).
- the electromagnetic field control member of the present disclosure is made of cylindrical ceramics, has an insulating member having a plurality of through holes extending in the axial direction, a long conductive member that closes the through holes, and a conductive member in the through holes. It is provided with a plurality of plate-shaped power supply terminals that are joined to a member to supply electricity from the outside.
- the conductive member is composed of a plurality of rod-shaped members connected along the axial direction.
- FIG. 3 is an enlarged view of a portion P in the sectional view taken along line BB in FIG. 1 (b). It is an enlarged view of the Q part in FIG. 1 (b). It is an enlarged view of the S part in FIG. (A), (b) and (c) are a plan view, a front view and a side view showing an example of an H-shaped terminal in the feeding terminal, respectively.
- (A) and (b) are a front view and a side view showing an example of a U-shaped terminal in a feeding terminal, respectively.
- (A) and (b) are a plan view and a side view showing an example of a conductive member composed of a plurality of rod-shaped members, respectively. It is an enlarged view of the end region in FIG. 7 (b).
- (A) and (b) are a plan view and a cross-sectional view showing another example of a conductive member composed of a plurality of rod-shaped members, respectively.
- the present embodiment provides an electromagnetic field control member provided with a conductive member capable of improving stability and durability even after repeated heating and cooling.
- CCiPM ceramic chamber integrated pulse magnet
- FIG. 1A shows an electromagnetic field control member 100 according to an embodiment of the present disclosure, which is CCiPM.
- the electromagnetic field control member 100 shown in FIG. 1 includes an insulating member 1 and flanges 2 and 2 attached to both ends of the insulating member 1, respectively.
- the flanges 2 and 2 are connected to each other by a shaft 3.
- the insulating member 1 is made of tubular ceramics.
- the insulating member 1 has a plurality of through holes 4 extending along the axial direction.
- the axial direction is a direction along the central axis of the insulating member 1 made of tubular ceramics.
- the insulating member 1 is provided with a plurality of first power supply terminals 5 and a plurality of second power supply terminals 6 at both ends, respectively.
- the first power supply terminal 5 is a terminal for power supply, and is connected to an external device via the line 7 as shown in FIG. 1 (b). Further, the two adjacent second power feeding terminals 6 are connected to another external device via the line 8.
- the conductive member 9 is arranged in the through hole 4. ..
- the conductive member 9 is made of a metal such as copper and extends in the axial direction together with the through hole 4. As shown in FIG. 3, the conductive member 9 closes the through hole 4. Since the conductive member 9 closes the through hole 4, the airtightness of the space 11 surrounded by the inner circumference of the insulating member 1 is ensured.
- the conductive member 9 may be made of oxygen-free copper (for example, the alloy number specified in JIS H 3100: 2012 is C1020 or the alloy number specified in JIS H 3510: 2012 is C1011 or the like).
- the conductive member 9 secures a conductive region for passing an induced current excited to accelerate or deflect electrons, heavy particles, etc. moving in the space 11.
- the conductive member 9 may have a flat plate shape, but it is preferable that the conductive member 9 is curved along the inner circumference of the tubular insulating member 1.
- the flatness of the inner surface 9a on the space 11 side and the outer surface 9b on the outer side is preferably 50 ⁇ m or less.
- the parallelism of the outer surface 9b with respect to the inner surface 9a is preferably 70 ⁇ m or less. If at least one of the flatness and the parallelism is in the above range, the airtightness of the space 11 is improved.
- the first power supply terminal 5 and the second power supply terminal 6 penetrate the insulating member 1 in order to supply electric power to the conductive member 9 from an external device near both ends of the conductive member 9 arranged along the axial direction. It is connected to the conductive member 9 in the hole 4.
- a metallized layer 12 is formed on the inner wall of the insulating member 1 facing each other with the through hole 4 interposed therebetween.
- the metallized layer 12 is formed from one end face to the other end face forming a through hole 4 extending in the axial direction.
- the metallized layer 12 include molybdenum as a main component and manganese.
- the molybdenum content is 80% by mass or more and 85% by mass or less
- the manganese content is 15% by mass or more and 20% by mass or less.
- the surface of the metallized layer 12 may be provided with a metal layer containing nickel as a main component.
- a plating layer may be formed instead of the metallized layer 12.
- the thickness of the metallized layer 12 is, for example, 15 ⁇ m or more and 45 ⁇ m or less.
- the thickness of the metal layer is, for example, 0.1 ⁇ m or more and 2 ⁇ m or less.
- the inner wall of the insulating member 1 on which the metallized layer 12 is formed has an inclined surface 13A in which the width (interval) between the inner walls facing each other gradually increases from the inner circumference to the outer circumference of the insulating member 1.
- a vertical surface 13B located on the inner peripheral side of the insulating member 1 and having a constant width between inner walls facing each other.
- the inclined surface 13A and the vertical surface 13B are preferably provided over the entire length of the through hole 4.
- the angle ⁇ (see FIG. 3) formed by the inner walls facing each other across the through hole 4 is 8 ° or more, preferably 12 ° or more, 20 ° or less, preferably 16 ° or less. It is good to have it.
- the angle ⁇ is in this range, the mechanical strength of the insulating member 1 can be maintained, and cracks in the insulating member 1 can be further suppressed.
- the angle ⁇ formed by the facing inner walls may be measured in a cross section orthogonal to the axial direction.
- the three-point bending strength indicating the mechanical strength of the insulating member 1 is, for example, 350 MPa or more.
- the three-point bending strength may be determined in accordance with JIS R 1601: 2008 (ISO 14704: 2000 (MOD)).
- the vertical surface 13B is formed on the inner peripheral side of the insulating member 1, a gap is generated between the side surface of the conductive member 9 and the metallized layer 12 formed on the inner wall due to the variation in the angle of the inclined surface 13A.
- the airtightness between the conductive member 9 and the insulating member 1 is increased, and the airtightness of the entire electromagnetic field control member 100 is improved.
- the inclined surface 13A and the vertical surface 13B should be continuous.
- the first power feeding terminal 5 is inserted into the through hole 4 along the radial direction of the insulating member 1, and the bottom portion is in contact with the conductive member 9.
- the first power feeding terminal 5 is erected on the conductive member 9.
- the first power feeding terminal 5 is made of a metal such as copper, and the line 7 is connected to the rear end portion as described above.
- the line 7 is made of a metal such as copper, and is particularly preferably made of oxygen-free copper (for example, the alloy number specified in JIS H 3100: 2012 is C1020 or the alloy number specified in JIS H 3510: 2012 is C1011 or the like).
- the first power feeding terminal 5 includes an H-shaped terminal 14 and a U-shaped terminal 15 that supports the H-shaped terminal 14. .
- the H-shaped terminal 14 has an H-shaped top view, gaps 16 and 16 are formed on both sides, and the tip of the line 7 is fixed (screw-fastened, etc.) to the central portion. ) Is formed.
- screw insertion holes 17 are formed on both sides of the H-shaped terminal 14.
- the H-shaped terminal 14 has a T-shaped shape when viewed from the side.
- the U-shaped terminal 15 is formed in a plate shape, has a notch portion 18, and has screw insertion holes 19 formed on both sides of the notch portion 18. Has been done.
- the U-shaped terminal 15 is inserted into the gaps 16 and 16 on both sides of the H-shaped terminal 14, and the step 19 located at the upper part of the H-shaped terminal 14 (see FIG. 5C). ) Is in contact with the upper end of the U-shaped terminal 15, then the screw insertion holes 17 and 18 are communicated with each other, and are connected by bolts (not shown).
- the tip of the line 7 is screwed into the hole 14a in the center of the H-shaped terminal 14, so that the first power feeding terminal 5 and the line 7 are electrically connected.
- a groove 20 is formed in a predetermined range along the axial direction of the insulating member 1 on the upper surface (the surface on the through hole 4 side) of the conductive member 9.
- the lower end of the U-shaped terminal 15 is fitted into the groove 20, and the first power feeding terminal 5 is erected on the conductive member 9.
- the first power supply terminal 5 is composed of only two H-type terminals 14 and U-type terminals 15, the number of parts is small and the terminals can be easily fixed and removed from each other.
- the groove 20 may have a long shape, and the end faces of both ends of the groove 20 may have a curved surface shape, or the corner portions may have a chamfered structure. With such a structure, even if heating and cooling are repeated during use, the rod-shaped member 92 can easily absorb and relax the thermal stress, and cracks are less likely to occur in the rod-shaped member 92. Since the second power supply terminal 6 shown in FIGS. 1 and 2 has the same configuration as the first power supply terminal 5, it is erected on the conductive member 9 in the same manner as the first power supply terminal 5.
- the conductive member 9 is composed of a plurality of rectangular rod-shaped members 91 and 92, and the rod-shaped members 92 are connected to both ends of the rod-shaped member 91 along the axial direction. There is. That is, since the conductive member 9 is substantially divided into a plurality of parts, even if heating and cooling are repeated during use, the rod-shaped members 91 and 92 can easily absorb and relax the thermal stress, and the rod-shaped member 9 can be easily absorbed and relaxed. Cracks are less likely to occur in 91 and 92. Therefore, it becomes possible to improve stability and durability. Further, the rod-shaped members 91 and 92 can be easily mounted in the through hole 4.
- the conductive member 9 includes a rod-shaped member 91 located in the central region of the through hole 4 along the axial direction of the insulating member 1 and rod-shaped members 92 and 92 located in both end regions of the through hole 4. Including, the rod-shaped member 91 in the central region is longer than each rod-shaped member 92 in the both end regions. Therefore, it becomes easier to mount the rod-shaped members 91 and 92 in the through hole 4.
- the rod-shaped member 91 and the rod-shaped member 92 may have the same length, and conversely, the rod-shaped member 91 in the central region may be shorter than the rod-shaped member 92 in the end region.
- rod-shaped members 91, 92, and 92 are used in the above example, for example, two rod-shaped members having the same length or different lengths may be connected to each other, and the rod-shaped members to be connected may be connected.
- the number is not particularly limited.
- the rod-shaped members 91 and 92 have long main body portions 91a and 92a extending along the axial direction of the insulating member 1, respectively. It includes connecting portions 91b and 92b extending along the axial direction from the main body portions 91a and 92a.
- the connecting portions 91b and 92b have stepped surfaces 21 and 21 located between the upper surface and the lower surface of the main body portions 91a and 92a.
- the adjacent rod-shaped members 91 and 92 are connected by overlapping the stepped surfaces 21 and 21 of the adjacent connecting portions 91b and 92b.
- a brazed portion (not shown) in order to enhance the long-term reliability of the joining.
- the number of brazed portions should be two or less. Since the brazed portion is an electrical contact, the electrical contact resistance can be suppressed by limiting the number of the electrical contacts.
- the brazing material for forming the brazed portion for example, silver wax (for example, BAg-8, BAg-8A, BAg-8B) or the like can be used.
- the stepped surfaces 21 and 21 are located between the upper surface and the lower surface of the main body portions 91a and 92a, but the stepped surface is located between both side surfaces of the main body portions 91a and 92a.
- the surfaces 21 and 21 may be located.
- the end faces of the main body portions 91a, 92a of one of the rod-shaped members 91 or 92 and the connecting portions 91b, 92b of the other rod-shaped member 92 or 91 It is preferable to have a gap 22 between the end face and the end face. Even if the rod-shaped members 91 and 92 are repeatedly heated and cooled to expand and contract, the presence of the gap 22 causes an impact on the end faces of the connecting portion 91b and the main body portion 92a, and between the end faces of the connecting portion 92b and the main body portion 91a. You can reduce the number of additions.
- the axial length of the gap 22 is, for example, 0.8 mm or more and 1.2 mm or less.
- the end surface 92c of the tip end portion of the rod-shaped member 92 located at both ends of the through hole 4 along the axial direction of the insulating member 1 is preferably curved. Since the tip of the rod-shaped member 92 is on the non-connecting side, stress concentration at the tip on the non-connecting side can be relaxed by forming the end surface 92c of the tip into a curved surface.
- the end surface 92c may be curved at least in a plan view, but may be curved in a side view (that is, over the entire circumference).
- the end surface 92c of the tip end portion of the rod-shaped member 92 may have a chamfered structure (C chamfering, R chamfering, etc.) at a corner portion at least in a plan view.
- FIGS. 9A and 9B show other connecting structures of the plurality of rod-shaped members 91, 92. That is, as shown in FIGS. 9A and 9B, the rod-shaped members 91, 92 have long main body portions 91a, 92a extending in the axial direction and axially from the main body portions 91a, 92a.
- the connecting portions 91b and 92b extend along the connecting portions 91b and 92b, and the connecting portions 91b and 92b have an inclined surface 23 located between the upper surface and the lower surface of the main body portions 91a and 92a.
- the adjacent rod-shaped members 91, 92 are connected by joining the inclined surfaces 23, 23 of the connecting portion connecting portions 91b, 92b with each other by a brazing portion (not shown). Even when the connecting portions 91b and 92b having such an inclined surface 23 are connected, the stress remaining on the insulating member 1 is relaxed, so that cracks in the insulating member 1 can be suppressed for a long period of time.
- the brazing material forming the brazed portion is, for example, silver wax (for example, BAg-8, BAg-8A, BAg-8B).
- the inclined surfaces 23, 23 may be formed not between the upper surface and the lower surface of the main body portions 91a, 92a, but between both side surfaces of the main body portions 91a, 92a.
- the above-mentioned insulating member 1 has electrical insulation and non-magnetism, and is made of, for example, ceramics containing aluminum oxide as a main component, ceramics containing zirconium oxide as a main component, and particularly from ceramics containing aluminum oxide as a main component. It is preferable to be.
- the ceramics contain aluminum oxide as a main component, magnesium, calcium and silicon may be contained as oxides.
- the average particle size of the aluminum oxide crystals is preferably 5 ⁇ m or more and 20 ⁇ m or less.
- the area of the grain boundary phase per unit area is reduced as compared with the case where the average particle size is less than 5 ⁇ m, so that the thermal conductivity is improved.
- the area of the grain boundary phase per unit area increases as compared with the case where the average particle size exceeds 20 ⁇ m, the adhesion of the metallized layer 12 becomes higher due to the anchor effect of the metallized layer 12 in the grain boundary phase. The reliability is improved and the mechanical properties are improved.
- an average particle diameter D 50 is polished by Doban using diamond abrasive grains having a 3 [mu] m. Then, it is polished on a tin plate using diamond abrasive grains having an average particle size D 50 of 0.5 ⁇ m.
- the polished surface obtained by these polishings is subjected to heat treatment at 1480 ° C. until the crystal particles and the grain boundary layer can be distinguished, and a cross section as an observation surface is obtained. The heat treatment is performed for, for example, about 30 minutes.
- the heat-treated surface is observed with an optical microscope, and an image is taken at a magnification of, for example, 400 times.
- the measurement range is an area of 4.8747 ⁇ 10 2 ⁇ m 2.
- image analysis software for example, Win ROOF manufactured by Mitani Shoji Co., Ltd.
- the particle size of each crystal can be obtained, and the average particle size of each crystal is individual. It is an arithmetic mean of the particle size which is the equivalent diameter of the crystal circle.
- the kurtosis of the particle size of the aluminum oxide crystal is preferably 0 or more.
- the kurtosis of the particle size of the aluminum oxide crystal is preferably 0.1 or more.
- Kurtosis is a statistic that generally indicates how much the distribution deviates from the normal distribution, and indicates the degree of kurtosis of the mountain and the degree of spread of the hem. When the kurtosis is less than 0, the kurtosis is gentle and the hem is short. When it is larger than 0, it means that the point is sharp and the hem is long. In the normal distribution, the kurtosis is 0.
- the kurtosis can be determined by the function Kurt provided in Excel (registered trademark, Microsoft Corporation) using the particle size of the crystal.
- the kurtosis of the particle size of the aluminum oxide powder as a raw material may be 0 or more.
- the ceramics containing aluminum oxide as a main component are ceramics having an aluminum oxide content of 90% by mass or more in which Al is converted into Al 2 O 3 out of 100% by mass of all the components constituting the ceramics.
- the ceramics containing zirconium oxide as a main component are ceramics having a zirconium oxide content of 90% by mass or more in which Zr is converted into ZrO 2 out of 100% by mass of all the components constituting the ceramics.
- the components constituting the ceramics are identified using an X-ray diffractometer (XRD) using CuK ⁇ rays, and then contain elements using a fluorescent X-ray analyzer (XRF) or an ICP emission spectroscopic analyzer (ICP). The amount may be determined and converted into the content of the identified component.
- the size of the insulating member 1 is set, for example, to have an outer diameter of 35 mm or more and 45 mm or less, an inner diameter of 25 mm or more and 35 mm or less, and an axial length of 340 mm or more and 420 mm or less.
- an insulating member 1 made of ceramics whose main component is aluminum oxide first, aluminum oxide powder as a main component, aluminum oxide powders, silicon oxide and calcium carbonate powders, and aluminum oxide powders as needed are added.
- the dispersant to be dispersed is pulverized and mixed with a ball mill, a bead mill or a vibration mill to form a slurry, a binder is added to the slurry and mixed, and then spray-dried to obtain granules containing aluminum oxide as a main component.
- the time for grinding and mixing is adjusted so that the particle size of the powder is 0 or more.
- the average particle size (D 50 ) of the aluminum oxide powder is 1.6 ⁇ m or more and 2.0 ⁇ m or less, and the content of the magnesium hydroxide powder in 100% by mass of the total of the powder is 0.43 to 0.53 mass. %, The content of the silicon oxide powder is 0.039 to 0.041% by mass, and the content of the calcium carbonate powder is 0.020 to 0.022% by mass.
- the granules obtained by the above method are filled in a molding die, and a molded product is obtained by using a hydrostatic pressure press molding method (rubber press method) or the like, for example, setting the molding pressure to 98 MPa or more and 147 MPa or more.
- a hydrostatic pressure press molding method rubber press method
- a long pilot hole that becomes a plurality of through holes 4 along the axial direction of the insulating member 1 and a pilot hole that opens both end faces along the axial direction of the insulating member 1 are formed by cutting. Then, all of them are formed into a cylindrical molded body.
- the molded body formed by cutting is heated in a nitrogen atmosphere for 10 hours to 40 hours, held at 450 ° C. to 650 ° C. for 2 hours to 10 hours, and then naturally cooled to obtain a binder. It disappears and becomes a degreased body. Then, the molded body (defatted body) is oxidized in an atmospheric atmosphere, for example, by setting the firing temperature to 1500 ° C. or higher and 1800 ° C. or lower and holding the molded body (defatted body) at this firing temperature for 4 hours or more and 6 hours or less to contain aluminum oxide as a main component. A sintered body having an average particle size of aluminum crystals of 5 ⁇ m or more and 20 ⁇ m or less can be obtained.
- the insulating member 1 can be obtained by grinding the inner circumference and the outer circumference of the sintered body, respectively.
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Abstract
Description
内面9aに対する外面9bの平行度は、70μm以下であるとよい。
平面度および平行度の少なくともいずれかが上記範囲であれば、空間11の気密性が向上する。
メタライズ層12は、例えば、モリブデンを主成分とし、マンガンを含むものが挙げられる。この場合、メタライズ層12を構成する成分100質量%のうち、例えば、モリブデンの含有量が80質量%以上85質量%以下であり、マンガンの含有量が15質量%以上20質量%以下である。また、メタライズ層12の表面には、ニッケルを主成分とする金属層を備えていてもよい。なお、メタライズ層12に代えて、メッキ層を形成してもよい。
メタライズ層12の厚みは、例えば、15μm以上45μm以下である。
金属層の厚みは、例えば、0.1μm以上2μm以下である。
軸方向に直交する断面において、貫通孔4を挟んで対向する内壁のなす角度θ(図3を参照)は、8°以上、好ましくは12°以上で、20°以下、好ましくは16°以下であるのがよい。角度θがこの範囲であるときには、絶縁部材1の機械的強度を維持することができるとともに、絶縁部材1へのクラックをさらに抑制することができる。
なお、対向する内壁のなす角度θの測定にあたっては、軸方向に直交する断面において測定すればよい。
絶縁部材1の機械的強度を示す3点曲げ強度は、例えば、350MPa以上である。3点曲げ強度は、JIS R 1601:2008(ISO 14704:2000(MOD))に準拠して求めればよい。
一方、U型端子15は、図6(a)、(b)に示すように、板状で形成され、切り欠き部18を有すると共に、該切り欠き部18の両側にねじ挿通孔19が形成されている。
溝20にU型端子15の下端部が嵌入されることにより、第1の給電端子5を導電部材9上に安定的に立設することができる。
溝20は長尺状であり、溝20の両端部の端面が、曲面状であるか、または角部が面取り構造を有していてもよい。このような構造であると、使用時に加熱および冷却を繰り返しても、棒状部材92で熱応力を吸収緩和しやすくなり、棒状部材92にクラックが発生しにくくなる。
図1、図2に示す第2の給電端子6は、第1の給電端子5と同様の構成であるので、第1の給電端子5と同様にして導電部材9上に立設されている。
なお、棒状部材91と棒状部材92は、同じ長さであってもよく、また、上記と逆に、中央領域の棒状部材91が端部領域の棒状部材92より短くてもよい。さらに、上記の例では3つの棒状部材91、92、92を使用したが、例えば、長さが同じか、あるいは相異なる2つの棒状部材を連結したものであってもよく、連結する棒状部材の数は特に制限されない。
これにより、加熱および冷却を繰り返しても、連結部91b,92bで熱応力を吸収緩和しやすくなり、棒状部材91、92にクラックが発生するおそれがさらに低減する。
なお、端面92cは少なくとも平面視において曲面状であればよいが、側面視においても(すなわち全周にわたって)曲面状であってもよい。
また、曲面状とする代わりに、棒状部材92の先端部の端面92cが、少なくとも平面視において、角部が面取り構造(C面取り、R面取り等)を有していてもよい。
なお、傾斜面23、23は、本体部91a、92aの上面と下面との間でなく、本体部91a、92aの両側面の間に形成されていてもよい。
酸化アルミニウムの結晶の平均粒径は、5μm以上20μm以下であるのが好ましい。
尖度とは、一般に、分布が正規分布からどれだけ逸脱しているかを表す統計量で、山の尖り度と裾の広がり度を示している。尖度が0未満のときは尖りが緩やかで裾が短い。0より大きいときは尖りが急で裾が長いことを意味する。正規分布では、尖度は0となる。尖度は、結晶の粒径を用いて、Excel(登録商標、Microsoft Corporation)に備えられている関数Kurtにより求めることができる。尖度を0以上とするには、例えば、原料となる酸化アルミニウム粉末の粒径の尖度が0以上となるようにすればよい。
酸化ジルコニウムを主成分とするセラミックスとは、セラミックスを構成する全成分100質量%のうち、ZrをZrO2に換算した酸化ジルコニウムの含有量が90質量%以上であるセラミックスのことである。
セラミックスを構成する成分は、CuKα線を用いたX線回折装置(XRD)を用いて同定した後、蛍光X線分析装置(XRF)またはICP発光分光分析装置(ICP)を用いて、元素の含有量を求め、同定された成分の含有量に換算すればよい。
ここで、酸化アルミニウム粉末の平均粒径(D50)は1.6μm以上2.0μm以下であり、上記粉末の合計100質量%における水酸化マグネシウム粉末の含有量は0.43~0.53質量%、酸化珪素粉末の含有量は0.039~0.041質量%、炭酸カルシウム粉末の含有量は0.020~0.022質量%である。
そして、成形体(脱脂体)を大気雰囲気中で、例えば、焼成温度を1500℃以上1800℃以下とし、この焼成温度で4時間以上6時間以下保持することによって、酸化アルミニウムを主成分とし、酸化アルミニウムの結晶の平均粒径が、5μm以上20μm以下である焼結体を得ることができる。
この焼結体の内周および外周をそれぞれ研削加工することによって絶縁部材1を得ることができる。
2 フランジ
3 シャフト
4 貫通孔
5 第1の給電端子
6 第2の給電端子
7、8 ライン
9 導電部材
91,92 棒状部材
91a、92a 本体部
91b、92b 連結部
92c 端面
11 空間
12 メタライズ層
13A 傾斜面
13B 垂直面
14 H型端子
14a 穴
15 U型端子
16 間隙
17,18 ねじ挿通孔
19 段差
20 溝
21 段差面
22 間隙部
23 傾斜面
100 電磁場制御用部材
Claims (14)
- 円筒状のセラミックスからなり、軸方向に沿って伸びる複数の貫通孔を有する絶縁部材と、
前記貫通孔を閉塞する導電部材と、
前記貫通孔内で前記導電部材と接合して外部から電気を供給する複数の板状の給電端子とを備え、
前記導電部材は、前記軸方向に沿って連結された複数の棒状部材を備える、電磁場制御用部材。 - 複数の前記棒状部材は、ろう付け部によって互いに接合されてなる、請求項1に記載の電磁場制御用部材。
- 前記ろう付け部は、2箇所以下である、請求項2に記載の電磁場制御用部材。
- 複数の前記棒状部材のうち、前記軸方向に沿って伸びる前記貫通孔の少なくとも中央領域に位置する棒状部材と、前記軸方向に沿って伸びる貫通孔の端部領域に位置する棒状部材とを含み、前記中央領域に位置する棒状部材は、前記端部領域に位置する棒状部材よりも長さが長い、請求項1~3のいずれかに記載の電磁場制御用部材。
- 前記軸方向に沿った前記貫通孔の両端部に位置する前記棒状部材の先端部の端面が、曲面状であるか、または角部が面取り構造を有する、請求項1~4のいずれかに記載の電磁場制御用部材。
- 前記軸方向に沿った前記貫通孔の両端部に位置する前記棒状部材は、前記給電端子の下端部が嵌入される溝を有する、請求項1~5のいずれかに記載の電磁場制御用部材。
- 前記溝は長尺状であり、前記溝の両端部の端面が、曲面状であるか、または角部が面取り構造を有する、請求項6に記載の電磁場制御用部材。
- 前記棒状部材は、前記軸方向に沿って伸びる長尺状の本体部と、該本体部から軸方向に沿って伸びる連結部とを備え、該連結部は、前記本体部の上面と下面または両側面との間に位置する段差面を有する、請求項1~7のいずれかに記載の電磁場制御用部材。
- 隣り合う棒状部材は、前記連結部が有する前記段差面同士を接合させて連結されている、請求項8に記載の電磁場制御用部材。
- 隣り合う棒状部材のうち、一方の棒状部材が有する前記本体部の端面と、他方の棒状部材が有する前記連結部の端面との間に、間隙部を有している、請求項8または9に記載の電磁場制御用部材。
- 前記棒状部材は、前記軸方向に沿って伸びる長尺状の本体部と、該本体部から軸方向に沿って伸びる連結部とを備え、該連結部は、前記本体部の上面と下面または両側面との間に位置する傾斜面を有する、請求項1~7のいずれかに記載の電磁場制御用部材。
- 隣り合う棒状部材は、前記連結部が有する前記傾斜面同士を接合させて連結されている、請求項9に記載の電磁場制御用部材。
- 前記絶縁部材の内周から外周に向かって、前記貫通孔を挟んで対向する前記絶縁部材の内壁間の幅が漸増してなり、前記軸方向に直交する断面において、前記内壁のなす角度が8°以上16°以下である、請求項1~10のいずれかに記載の電磁場制御用部材。
- 前記給電端子は、H型端子と、該H型端子を支持するU型端子とを備えている、請求項1~11のいずれかに記載の電磁場制御用部材。
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| US18/015,692 US12542221B2 (en) | 2020-07-17 | 2021-07-15 | Electromagnetic field control member |
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