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2003 Fiscal Year Final Research Report Summary

Development of electrostatic accelerator for ice dust and the aggregates

Research Project

Project/Area Number 13554015
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Space and upper atmospheric physics
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

ARAKAWA Masahiko  Hokkaido University, Inst. Low Temp. Sci., Inst., 低温科学研究所, 助手 (10222738)

Co-Investigator(Kenkyū-buntansha) WATANABE Naoki  Hokkaido University, Inst. Low Temp. Sci., Inst., 低温科学研究所, 助手 (50271531)
MAENO Norikazu  Hokkaido University, Inst. Low Temp. Sci., Prof., 低温科学研究所, 教授 (50001657)
Project Period (FY) 2001 – 2003
Keywordslcy planets / Ice dust / Electrostatic accelerator / Impact experiment / Aggregates / High speed camera / Drag coefficient / Electric charge density
Research Abstract

We have developed an electrostatic accelerator to launch a ice dust and ice aggregates at a wide range of velocities from cm/s to km/s. The ice sample launched was prepared by a condensation, method : a cold copper plate cooled by liquid nitrogen was subjected to an air saturated with water vapor at -10℃. The condensed icy dust is an almost spherical shape with the size of 10 μm, Ice aggregates were grown by collecting each ice dust under high electric field more than 100 V/cm. The aggregate was charged under the electric field, so that it was launched by the electrostatic attraction. The relationship between the electric field and the velocity is derived as follows for the aggregates of 500μm.: V_i=0.25(V_<o>/d)^<0.9> (m/s), V_i: velocity, V_o: Voltage, d: distance between electrodes (d=2.5mm). The launch velocity is strongly affected by the air drag for the small aggregates, so we have set a vacuum chamber to eliminate the gas drag to the aggregates in the acceleration. We also used a longer acceleration tube to avoid disruption of the aggregates by the strong attraction force. As a result we have achieved 20m/s for 500μm aggregate at the electric field of 1kV/mm and 1 bar. In the evacuated condition of 0.1 bar, the launched velocity increased about 3 to 4 times higher than that of 1 bar at the same electric field strength. This means that it could be possible to achieve more than 100 m/s for ice aggregate of 500 μm at 1kV/mm.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Arakawa, M: "Ice-silicate fractionation among icy bodies due to the difference of impact strength between ice and ice-silicate mixture"Icarus. (In press). (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Maeno, N: "Effect of direct and alternating fields on friction between ice and metals"J.App.Phys. 95. 134-139 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Arakawa, M.: "Effect of direct and alternating fields on friction between ice and metals"Canadian Journal of Physics. 81. 209-216 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Watanabe, N.: "The dependence of H_2CO and CH_3OH formation on temperature and thickness of H_2O-CO ice during successive hydrogenation of CO"Astrophys.J.Lett.. 588. 121-124 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Arakawa, M.: "Impact experiments on porous icy-silicate cylindrical blocks and the implication for disruption and accumulation of small icy bodies"Icarus. 158. 516-531 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kato, M.: "Shock pressure attenuation in water ice at a pressure below 1 CPa"J.Geophys.Res.. 106. 17567-17578 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Arakaura, M., D.Tomizuka: "Ice-silicate fractionation among icy bodies clue to the difference of lmpact strength between ice and ice-cilicate mixture"Icarus. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Maeno, N., M.Arakawa: "Adhesion shear theory of ice friction at low sliding velocities combined with ice sintering"J.App.Phys.. 95. 134-139 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Arahawa, M., V.F.Petrenko, C.Chen: "Effect of direct and alternating fields on friction between ice and metals"Canadian Journal of Physics. 81. 209-216 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Watanabe, N., T.Shiraki, A.Kouchi: "The dependence of H_2CO and CH_3OH formation on temperature and thickness of H_2O-CO ice during successive hydrogenation of CO"Astrophys J.Lett.. 588. 121-124 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Arahawa, M., J.Leliwa-Kopystynski, N.Maeno: "Impact experiments on porous icy-silicate cylindrical blocks and the implication for disruption and accumulation of small icy bodies"Icarus. 158. 516-531 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kato, M., M.Higa, Y.Iijima, T.Kiyono, S.Nakazawa, M.Arakawa: "Shock pressure attenuation in water ice at a pressure below 1 GPa"J.Geophys.Res.. 106. 17567-17578 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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