CN107478913B - Superconducting cavity vertical test insert - Google Patents
Superconducting cavity vertical test insert Download PDFInfo
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- CN107478913B CN107478913B CN201710616402.8A CN201710616402A CN107478913B CN 107478913 B CN107478913 B CN 107478913B CN 201710616402 A CN201710616402 A CN 201710616402A CN 107478913 B CN107478913 B CN 107478913B
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- liquid helium
- vertical test
- vacuum
- superconducting cavity
- top flange
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- 238000012360 testing method Methods 0.000 title claims abstract description 127
- 239000007788 liquid Substances 0.000 claims abstract description 104
- 239000001307 helium Substances 0.000 claims abstract description 93
- 229910052734 helium Inorganic materials 0.000 claims abstract description 93
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 93
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 230000005855 radiation Effects 0.000 claims description 22
- 238000009413 insulation Methods 0.000 claims description 13
- 238000011282 treatment Methods 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 229910001069 Ti alloy Inorganic materials 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
Abstract
The invention discloses a superconducting cavity vertical test insert, which comprises a vertical test hanger, a vacuum system and a vertical test top flange, and is characterized by further comprising a liquid helium buffer groove and N liquid helium grooves, wherein each liquid helium groove corresponds to a superconducting cavity and is used for accommodating the superconducting cavity to be tested and liquid helium required for cooling the superconducting cavity; wherein, each liquid helium tank is respectively connected and fixed with a clamping plate of the vertical test hanging bracket; the liquid helium buffer tank is positioned between the hanging plate and the clamping plate of the vertical test hanging bracket and is fixedly connected through the hanging rod of the vertical test hanging bracket; the liquid filling pipe of the liquid helium buffer tank is connected with the vertical test top flange, the liquid helium buffer tank is provided with N liquid helium transmission lines, and each liquid helium transmission line is connected with one liquid helium tank and used for liquid helium transmission between the liquid helium buffer tank and the liquid helium tank; the vacuum system is provided with N vacuum pipelines, and each vacuum pipeline is used for being connected with a superconducting cavity to be tested. The invention greatly improves the testing efficiency.
Description
Technical Field
The invention relates to a superconducting cavity vertical test insert, and belongs to the technical field of particle accelerators and superconducting low temperatures.
Background
The superconducting cavity vertical test insert is an important component of a superconducting cavity vertical test system and is a supporting and hoisting system formed by multiple materials. The device works in a severe environment with low temperature, high vacuum and radiation of 2K (or 4K), and has the main functions of hoisting a superconducting cavity, sealing and testing the Dewar vacuum, and being used as a mounting carrier of a multilayer heat insulation plate, a vacuum pump, a radio frequency cable, a pressure gauge, a temperature sensor and other superconducting cavity testing accessory equipment.
In order to further explore the deep structure of the research substances, the mystery and law of the nature are revealed, the application of basic research in the technical field is promoted, and the superconducting accelerator is the focus of attention of scientists. The superconducting accelerator can accelerate particles to higher energy within a short distance, so that the high-energy particles can collide for high-energy physical research, and the analysis and research of living substances and material structures can be performed by utilizing rays emitted by the particles. Therefore, a plurality of large-scale superconductive accelerator projects at home and abroad are generated. The large-scale superconducting accelerator engineering needs a large number of superconducting cavities, for example, the linear accelerator coherent light source project being built in the United states needs more than 300 superconducting cavities, the future international linear collider jointly built by a plurality of national plans needs 16000 superconducting cavities, and the Shanghai free electron laser device to be built needs more than 700 superconducting cavities.
Each superconducting cavity must be mounted to a vertical test insert, the RF performance and some of the mechanical properties of the superconducting cavity are tested by a vertical test system, and after design requirements are met, the assembly is enabled. Because of the complex manufacturing process of superconducting cavities, many problems are currently under investigation, and therefore, one superconducting cavity can be subjected to multiple treatments and tests. To improve the vertical testing efficiency of superconducting chambers, compress the testing cycle and ensure the safety of the testing equipment requires a high efficiency, multi-functional vertical test insert system.
The general superconducting cavity vertical test insert system at home and abroad at present is shown in a schematic diagram in figure 1, and mainly comprises a vertical test top flange and a vertical test hanging bracket. The vertical test top flange is provided with a vacuum pump, a vacuum pipeline and other sensor devices. The vertical test hanger mainly comprises a plurality of layers of heat insulation boards, supporting boards, hanging rods, superconductive cavity fixing clamping boards and the like. The superconducting cavity to be tested is mounted to the test hanger as shown in fig. 1 and connected to the vacuum pipe and other sensing and measuring devices, and then the vertical test insert system is suspended entirely into the large test dewar and evacuated for temperature reduction testing. The vertical test top flange also serves to seal the test dewar vacuum.
This solution has the following drawbacks and disadvantages:
(1) The liquid helium quantity required for the performance test of the superconducting cavity is large, and the time period required for cooling and re-heating is long. Because the liquid helium is injected into the large Dewar for cooling the superconducting cavity, the liquid helium surface in the Dewar is required to be immersed into the superconducting cavity, and a certain height is required to be ensured for testing, and the liquid injection mode requires more cooling equipment (the Dewar inner cylinder, the superconducting cavity, the tooling hanging frame and the like), so that the cost of the liquid helium required for testing is increased, and the testing period is longer;
(2) Only one superconducting cavity can be subjected to cooling test at a time, the test efficiency is low, and the large-scale production test of the superconducting cavity is not facilitated. The vertical test insert has only one vacuum pipeline, and can be connected with only one superconducting cavity for cooling test each time under the condition of unchanged test period, so that the test efficiency is low;
(3) The radiation safety protection for the equipment on the vertical test top flange is insufficient. X-rays can be generated in the vertical testing process of the superconducting cavity, and the vacuum pump and other testing electronic devices are arranged on the vertical testing top flange, so that equipment is extremely easy to damage under the condition of no protection.
The three points influence the mass production test of the superconducting cavity to a certain extent, have high test cost and low efficiency, have certain equipment potential safety hazards and are not beneficial to the large-scale development and application of the superconducting accelerator.
Disclosure of Invention
In view of the technical problems existing in the prior art, an object of the present invention is to provide a superconducting cavity vertical test insert.
The technical scheme of the invention is as follows:
the vertical test insert of the superconducting cavity comprises a vertical test hanger, a vacuum system and a vertical test top flange, and is characterized by further comprising a liquid helium buffer tank and N liquid helium tanks, wherein each liquid helium tank corresponds to a superconducting cavity and is used for accommodating the superconducting cavity to be tested and liquid helium required for cooling the superconducting cavity; wherein, each liquid helium tank is respectively connected and fixed with a clamping plate of the vertical test hanging bracket; the liquid helium buffer tank is positioned between the hanging plate and the clamping plate of the vertical test hanging bracket and is fixedly connected through the hanging rod of the vertical test hanging bracket; the liquid filling pipe of the liquid helium buffer tank is connected with the vertical test top flange, the liquid helium buffer tank is provided with N liquid helium transmission lines, and each liquid helium transmission line is connected with one liquid helium tank and used for liquid helium transmission between the liquid helium buffer tank and the liquid helium tank; the vacuum system is provided with N vacuum pipelines, each vacuum pipeline is used for being connected with a superconducting cavity to be tested, and N is a natural number.
Further, the vacuum system comprises a vacuum pump and an N+1 through transfer pipe, wherein the vacuum pump is arranged on the outer side of the vertical test top flange, the vacuum pump is connected with the N vacuum pipes through the N+1 through transfer pipe, each vacuum pipe is provided with two vacuum valves, one vacuum valve is positioned on the outer side of the vertical test top flange, and the other vacuum valve is positioned on the inner side of the vertical test top flange.
Further, the device also comprises a radiation shielding plate; the radiation shield is mounted above the hanger plate of the vertical test hanger.
Further, the radiation shielding plate is of a circular structure, and is provided with N large holes for the vacuum pipeline to pass through and a plurality of small holes for the cable lines to pass through.
Further, the hanging plate of the vertical test hanging bracket is connected with the vertical test top flange through a hanging rod, and a heat insulation joint is added at the joint of the vertical test top flange and the hanging rod for heat insulation treatment; and a heat insulation joint is added at the joint of the suspender and the hanger plate for heat insulation treatment.
The main innovation points of the invention include:
(1) Adding a liquid helium buffer tank: the liquid helium buffer groove is added in the vertical test insert, and is connected with the liquid helium groove of the superconducting cavity through a low-temperature pipeline, when the liquid injection cooling test is carried out on the superconducting cavity, liquid injection is only needed to be carried out in the liquid helium buffer groove, and liquid helium does not need to be injected into the large Dewar. Because the liquid helium buffer tank is connected with the liquid helium tank of the superconducting cavity through the liquid helium transmission line, liquid helium can flow into the liquid helium tank of the superconducting cavity through the low-temperature transmission line to submerge the superconducting cavity, and the large Dewar only needs to keep a vacuum state at the moment. The liquid helium has the function of mainly providing a low-temperature test environment for the superconducting cavity, when the liquid helium tank of the superconducting cavity is filled with liquid helium, the physical characteristics of the superconducting cavity already meet the test requirements, the liquid helium in the liquid helium buffer tank can be supplemented from the outside in the test process, the liquid helium tank of the superconducting cavity is always ensured to be filled with liquid, and the liquid helium surface in the liquid helium buffer tank is maintained at a certain height. The mode can meet the requirement of vertical test of the superconducting cavity. Since the volume of the liquid helium buffer tank and the superconducting cavity liquid helium tank is much smaller than the volume of the Dewar, the volume and the mass of equipment required to be cooled are correspondingly reduced. Therefore, the use amount of test liquid helium is saved, the test cost is reduced, the temperature reduction liquid injection period and the rewarming period of the superconducting cavity are shortened, and the test efficiency is improved.
(2) Four vacuum pipes are adopted, and a vacuum pump is shared: the vacuum pump is arranged in the center of the vertical test top flange of the superconducting cavity, and a pump vacuum port is connected with four vacuum pipelines through a five-way pipe, the four vacuum pipelines share one vacuum pump, and each vacuum pipeline is provided with a separate valve. Each vacuum pipeline can be connected with one superconducting cavity vacuum valve, so that 4 superconducting cavities can be installed at one time and subjected to cooling test, the test efficiency is greatly improved, the test cost of each superconducting cavity is reduced, and the large-scale batch test of the superconducting cavities is facilitated.
(3) Radiation shielding plates are added on the vertical test hanging frame: x-rays generated in the testing process can be blocked by the increased radiation shielding plate, so that the radiation dose at the vertical test top flange is reduced, and the safety of equipment of a vacuum pump system and other electronic monitoring devices is facilitated.
Fig. 2 is a schematic diagram of a design scheme of a superconducting cavity vertical test insert, and the superconducting cavity vertical test insert system designed by the scheme mainly comprises a vertical test top flange, a vacuum system, a vertical test hanging bracket, a liquid helium buffer tank, a radiation shield and the like. The device can meet the vertical test of a plurality of superconducting cavities with liquid helium tanks at one time, can improve the test efficiency, saves the test cost, and improves the safety of equipment by adding the radiation protection device.
(1) Liquid helium buffer tank:
a schematic of the structure and installation of the liquid helium buffer tank is shown in fig. 3. The liquid helium buffer tank is connected with the hanging plate through a hanging rod, the upper part of the liquid helium buffer tank liquid injection pipe is welded with the top flange, four liquid helium transmission lines are arranged at the lower part of the liquid helium buffer tank, and the liquid helium transmission lines are used for being connected with the liquid helium tank of the superconducting cavity. External liquid helium is injected into the liquid helium buffer tank through a port of the liquid injection pipe, and liquid helium is injected into the liquid helium tank of each superconducting cavity through the liquid helium transmission line (in the test, each superconducting cavity is positioned in one liquid helium tank). The liquid helium buffer tank is positioned between the hanging plate of the vertical test hanging bracket and the clamping plate, the hanging rod of the vertical test hanging bracket is fixedly connected, the clamping plate is fixedly connected with the hanging rod at the lower end of the liquid helium buffer tank, and each superconducting cavity is respectively connected with the fixing clamping plate. The liquid helium buffer tank has smaller space volume compared with the external Dewar, and the liquid helium quantity required by the liquid injection container is small.
(2) And (3) a vacuum system:
a schematic of the vertical test insert vacuum system is shown in fig. 4. The vacuum pump and the five-way valve are arranged on the top of the top flange. The five-way pipe is connected with four vacuum pipes, the vacuum pipes are connected with the top flange through flange sealing interfaces, each vacuum pipe is provided with two vacuum valves, one vacuum valve is arranged on the outer side of the top flange, and the other vacuum valve is arranged on the inner side of the top flange. The lower end of the vacuum pipeline is connected with a vacuum angle valve of the superconducting cavity. When the vacuum pump is started, two vacuum valves of the vacuum pipeline are opened to perform gas replacement, and then an angle valve on the superconducting cavity is opened, so that the vacuum pump directly pumps the vacuum of the cavity. Because four vacuum pipelines are arranged, four superconducting cavities can be connected at the same time, and the testing efficiency is improved; because the four vacuum pipelines share one set of vacuum system and each vacuum pipeline is provided with a vacuum valve, the cost of the vacuum pump is saved and the four vacuum pipelines can be ensured to work independently.
(3) Radiation shield
As shown in fig. 5, the radiation shielding plate has a circular structure, and eight holes are formed on the outer side of the shielding plate: four large holes and four small holes. The vacuum tubing passes through four large holes and small holes serve as channels for radio frequency cables, heaters, and other sensor cables.
The radiation shielding plate is fixed with the suspension rod and is arranged above the suspension plate, and the installation schematic diagram of the radiation shielding plate is shown in fig. 6 and is used for shielding X rays generated in the superconducting cavity testing process. And the safety of the vacuum pump and other electronic measuring equipment on the top flange is protected.
Compared with the prior art, the invention has the following positive effects:
the invention can greatly save the liquid helium consumption of the vertical test of the superconducting cavity (generally about 3000L of liquid helium is needed for the low-temperature test of the superconducting cavity, the liquid helium consumption of the test is about 1500L by adopting the vertical test insert of the superconducting cavity, and half of the liquid helium consumption and related cost are saved), and can shorten the test period of the superconducting cavity (generally the time period of testing one superconducting cavity is seven days, including installation, cooling and rewarming, but the time period of testing four superconducting cavities by adopting the vertical test insert of the superconducting cavity is shortened to three days), thereby greatly improving the test efficiency of the superconducting cavity and laying a certain foundation for the large-scale production test of the superconducting cavity. And the radiation shielding plate is added in the superconducting cavity vertical test insert, so that the safety of test equipment and surrounding environment is improved, and the superconducting cavity vertical test insert is convenient to push and apply to enterprises.
Drawings
FIG. 1 is a diagram of a generic vertical test insert system architecture and principles of operation;
FIG. 2 is a schematic diagram of a superconducting cavity vertical test insert design;
FIG. 3 is a schematic view of a liquid helium buffer tank and mounting structure;
FIG. 4 is a schematic diagram of a vacuum system;
FIG. 5 is a schematic view of a radiation shield structure;
fig. 6 is a schematic view of a radiation shield installation.
Detailed Description
For a better understanding of the technical solution of the present invention, the following describes the present invention in further detail with reference to the drawings and specific examples.
The materials from which the superconducting cavity vertical test inserts are made require high mechanical strength and no magnetic properties. The top flange can be made of 316L stainless steel (the demagnetizing treatment is needed after the processing), the multilayer heat insulation plate is made of hard foam materials, the supporting plate is made of hard aluminum plates, the hanging rod is made of titanium alloy (TA 4), the liquid helium buffer tank is made of titanium alloy (TA 2), the vacuum pipeline on the outer side of the top flange and the five-way pipe are made of 316L stainless steel, the vacuum pipeline on the inner side of the top flange is made of titanium alloy (TA 2), and the radiation shielding plate is made of lead plates. And G10 heat insulation joints are added at the joints of the top flange and the suspender and the joints of the suspender and the suspending board for heat insulation treatment, so that static heat leakage of the superconducting cavity vertical test insert system is reduced. The screw rod and the shaft sleeve do not need to be made of the same material, the screw rod can be made of titanium alloy or stainless steel, the shaft sleeve can be made of brass, and the same material is prevented from being blocked.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The vertical test insert of the superconducting cavity comprises a vertical test hanger, a vacuum system and a vertical test top flange, and is characterized by further comprising a liquid helium buffer tank and N liquid helium tanks, wherein each liquid helium tank corresponds to a superconducting cavity and is used for accommodating the superconducting cavity to be tested and liquid helium required for cooling the superconducting cavity; wherein, each liquid helium tank is respectively connected and fixed with a clamping plate of the vertical test hanging bracket; the liquid helium buffer tank is positioned between the hanging plate and the clamping plate of the vertical test hanging bracket and is fixedly connected through the hanging rod of the vertical test hanging bracket; the liquid filling pipe of the liquid helium buffer tank is connected with the vertical test top flange, the liquid helium buffer tank is provided with N liquid helium transmission lines, and each liquid helium transmission line is connected with one liquid helium tank and used for liquid helium transmission between the liquid helium buffer tank and the liquid helium tank; the vacuum system is provided with N vacuum pipelines, each vacuum pipeline is used for connecting a superconducting cavity to be tested, and N is a natural number; the vacuum system comprises a vacuum pump and an N+1 through transfer pipe, wherein the vacuum pump is arranged on the outer side of the vertical test top flange, the vacuum pump is connected with the N vacuum pipes through the N+1 through transfer pipe, each vacuum pipe is provided with two vacuum valves, one vacuum valve is positioned on the outer side of the vertical test top flange, and the other vacuum valve is positioned on the inner side of the vertical test top flange; the hanging plate of the vertical test hanging bracket is connected with the vertical test top flange through a hanging rod, and a heat insulation joint is added at the joint of the vertical test top flange and the hanging rod for heat insulation treatment; and a heat insulation joint is added at the joint of the suspender and the hanger plate for heat insulation treatment.
2. The superconducting cavity vertical test insert of claim 1 further comprising a radiation shield; the radiation shield is mounted above the hanger plate of the vertical test hanger.
3. The superconducting cavity vertical test insert of claim 2 wherein the radiation shield has a circular configuration, the radiation shield having N large holes for passage of the vacuum conduit and a plurality of small holes for passage of cabling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710616402.8A CN107478913B (en) | 2017-07-26 | 2017-07-26 | Superconducting cavity vertical test insert |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710616402.8A CN107478913B (en) | 2017-07-26 | 2017-07-26 | Superconducting cavity vertical test insert |
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| Publication Number | Publication Date |
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| CN107478913A CN107478913A (en) | 2017-12-15 |
| CN107478913B true CN107478913B (en) | 2024-03-12 |
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| CN201710616402.8A Active CN107478913B (en) | 2017-07-26 | 2017-07-26 | Superconducting cavity vertical test insert |
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Families Citing this family (1)
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| CN112797309A (en) * | 2020-12-29 | 2021-05-14 | 探普(南京)工业科技有限公司 | Liquid helium dewar |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003083842A (en) * | 2001-09-17 | 2003-03-19 | Railway Technical Res Inst | Superconducting coil vibration testing device |
| CN102323160A (en) * | 2011-07-19 | 2012-01-18 | 兰州大学 | Multi-field coupling test system for superconducting material at temperature of between 373 and 4.2K |
| CN103716978A (en) * | 2014-01-14 | 2014-04-09 | 中国科学院近代物理研究所 | Half-wavelength superconductive accelerating cavity |
| CN105988053A (en) * | 2016-03-07 | 2016-10-05 | 中国科学院合肥物质科学研究院 | CICC conductor performance test system |
| CN207301181U (en) * | 2017-07-26 | 2018-05-01 | 中国科学院高能物理研究所 | A kind of superconductor cavity vertical checkout insert |
-
2017
- 2017-07-26 CN CN201710616402.8A patent/CN107478913B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003083842A (en) * | 2001-09-17 | 2003-03-19 | Railway Technical Res Inst | Superconducting coil vibration testing device |
| CN102323160A (en) * | 2011-07-19 | 2012-01-18 | 兰州大学 | Multi-field coupling test system for superconducting material at temperature of between 373 and 4.2K |
| CN103716978A (en) * | 2014-01-14 | 2014-04-09 | 中国科学院近代物理研究所 | Half-wavelength superconductive accelerating cavity |
| CN105988053A (en) * | 2016-03-07 | 2016-10-05 | 中国科学院合肥物质科学研究院 | CICC conductor performance test system |
| CN207301181U (en) * | 2017-07-26 | 2018-05-01 | 中国科学院高能物理研究所 | A kind of superconductor cavity vertical checkout insert |
Non-Patent Citations (1)
| Title |
|---|
| Design and commissioning of vertical test cryostats for XFEL superconducting cavities measurements;J. Polinski等;AIP Conference Proceedings;第1573卷(第1期);第1214-1221页 * |
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