1999 Fiscal Year Final Research Report Summary
Development of comet nucleus simulation experiments
| Project/Area Number |
10554027
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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 | 展開研究 |
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| Research Field |
地球化学
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| Research Institution | Institute of Low Temperature Science, HOKKAIDO UNIVERSITY |
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Principal Investigator |
KOUCHI Akira Hokkaido Univ., Inst. Low Temp. Sci., Prof., 低温科学研究所, 教授 (60161866)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Naoki Hokkaido Univ., Inst. Low Temp. Sci., Inst., 低温科学研究所, 助手 (50271531)
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| Project Period (FY) |
1998 – 1999
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| Keywords | comet / cometary nucleus / amorphous ice / fine particles / ice |
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| Research Abstract |
We have developed new methods for making amorphous icy grains:
1 ) CO sublimation-induced disruption method
First, we deposited CO sample of 10 mm thickness. Second, thin film of amorphous water ice was deposited on the CO. After deposition, the substrate was heated by turning off the helium refrigerator. At temperatures around 30 K, corresponding to CO sublimation temperatures, the sublimation of CO occurred violently, and this caused the disruption of the thin film of amorphous water ice.
2) Continuous production method by fast codeposition of HィイD22ィエD2O and COィイD22ィエD2.
We found that continuous disruption of ice film occurred during the deposition , when deposition rate is larger than 3x10ィイD1-9ィエD1 m/s and when thickness of the film is larger than critical thickness.
In both method, we collected amorphous icy grains falling from the substrate using grain collector. These methods enables us to perform better comet nucleus simulation experiments than hitherto performed.
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