Development of comet nucleus simulation experiments

彗核模拟实验进展

• 批准号: 10554027
• 负责人: KOUCHI Akira
• 金额: $ 9.79万
• 依托单位: Institute of Low Temperature Science, HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10554027/
• 关键词: comet; cometary nucleus; amorphous ice; fine particles; ice

We have developed new methods for making amorphous icy grains:1 ) CO sublimation-induced disruption methodFirst, 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.

我们发展了制备非晶冰粒的新方法：1）CO升华诱导破裂法首先，我们沉积了10 mm厚的CO样品。其次，在CO上沉积无定形水冰薄膜。沉积后，通过关闭氦制冷机来加热衬底。在30 K左右，CO升华温度附近，CO发生剧烈的升华，导致非晶水冰薄膜的破裂; 2）H_（22）O_（22）的快速共沉积连续制备方法。当沉积速率大于3 × 10 ~（-1）D_1 -9 × 10 ~（-1）D_1 m/s和薄膜厚度大于临界厚度时，两种方法都是利用颗粒收集器收集从衬底上脱落的非晶冰粒。这些方法使我们能够进行更好的彗星核模拟实验比迄今为止进行。

项目成果

Jepiskinns,P.,D.F.Blake and A.Kouchi: "Amorphous water ice- A solar system material" Solar System Ices. 139-155 (1998)

Jepiskinns,P.,D.F.Blake 和 A.Kouchi：“非晶水冰 - 太阳系材料”太阳系冰。

Arakawa, M.: "Collisional disruption of ice by high velocity impact" Proc.31th ISAS Lunar and Planetary Symp.13-16 (1998)

Arakawa, M.：“高速撞击对冰的碰撞破坏”Proc.31th ISAS Lunar and Planetary Symp.13-16 (1998)

Kouchi, A., et al.: "Crystallization Heat of Impure Amorphous H_20 Ice"Geophys. Res. Lett. in press

Kouchi, A. 等人：“不纯非晶态 H_20 冰的结晶热”Geophys。

Kouchi A.et al.: "New methods for making amorphous icy grains for comet nucleus simulation experiments"Proc.32nd ISAS Lunar and Planetary Symp.. 121-124 (1999)

Kouchi A.等人：“为彗星核模拟实验制作非晶冰粒的新方法”Proc.32nd ISAS Lunar and Planetary Symp.. 121-124 (1999)

香内晃: "宇宙のアモルファス物質"応用物理. 68. 1179-1180 (1999)

Akira Kanai：“宇宙中的无定形物质”应用物理学 68. 1179-1180 (1999)。