Basic research of pellet injector for inertial fusion
| Project/Area Number |
07458115
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Osaka University |
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Principal Investigator |
YAMANAKA Tatsuhiko Institute of Laser Engineering, Osaka University, Professor, レーザー核融合研究センター, 教授 (80107143)
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| Co-Investigator(Kenkyū-buntansha) |
NORIMATSU Takayoshi Institute of Laser Engineering, Osaka University, Associate Professor, レーザー核融合研究センター, 助教授 (50135753)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1997: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1996: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Injector / Inertial fusion / Pellet / Coil gun / Linear motor / Sabot / Laser / Magnetic |
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| Research Abstract |
Basic technology necessary to develop a fuel pellet injection system for a future laser fusion reactor was investigated. The project is dictated to develop precise velocity control technology and trace technology for the injected pellet.
In the future laser fusion reactor, fuel pellets consisting 6-mm-diameter capsule filled with deuterium and tritium are injected into the center at repetition rate of few IIz. Since the implosion efficiency strongly depends upon the irradiation uniformity, the fuel pellet must be exactly located at the firing position when it is irradiated by laser beams. Current understanding for the centering accuracy is less than 50 micrometer. Since the injection velocity of the pellet is about 300 m/s, this specification requires the detection system with 10 micro rad in direction and 0.1 micro second in the timing.
Since the required injection velocity of 300 m/s is already demonstrated somewhere, we concentrated in improving the repeatability. For the first stem, influence of deviation in the initial position on the final injection velocity was investigated. We found that a deviation of 100 micrometer from the optimized position result in velocity deference of 10^6. We can say that the accuracy of initial pellet loading is not so serious for injection system.
For the trace technology, we proposed a detection system consisting of three flat laser beams and three photo detectors. We found that the system can detect the passage of s real size pellet with accuracy of 10 ns in the timing and 10 micrometer in the position. There results indicate futuer trace system can be constructed by using one set for x, and y axis each and 3 sets of x-y units for Z (injection) axis.
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Report
(4 results)
Research Products
(6 results)
