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Award for Early Career Research Contributions

• Date: Jul. 24, 2013
• Title:
  Finite Temperature Effect on Structural Changes of Single Crystaline Graphite under Plasma Irradiatione

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Context: In our previous work [1, 2], hydrogen injection into single crystalline graphite was performed by binary-collisionapproximation-based (BCA) simulation [3] and a hybrid simulation [4, 5] of BCA and molecular dynamics (MD) simulation [6, 7]. As a result, an interesting phenomenon called "channeling" was observed in the case of crystalline structure. Because of the channeling effect, incident atoms with specific incident angle corresponding to crystalline structure move straightly without causing large angle scattering in the target material. The mean depth of incident atoms in the case where the channeling effect exists strongly depend on the temperature of the target materials because the vibration of atoms of target material causes dechanneling by hitting and kicking the projectile away from the channeling path. In this paper [8], therefore, to investigate the effect of the finite temperature of the target material, our BCA simulation code AC∀T is extended to handle the thermal vibration of atoms.

References: [1] S. Saito, A. M. Ito, A. Takayama, and H. Nakamura, “Structural Change of Single-Crystalline Graphite under Plasma Irradiation”, Jpn. J. Appl. Phys., 52, 01AL02, (2013). [2] S. Saito, A. Takayama, A. M. Ito, and H. Nakamura, “Progress of Binary-Collision-Approximation-Based Simulation for Cumulative Structural Changes of Target Materials”, Proc. Int. Conf. Modeling and Simulation Technology, 197-200, (2011). [3] S. Saito, A. M. Ito, A. Takayama, and H. Nakamura, “Binary-Collision-Approximation-Based Simulation of Noble Gas Irradiation to Tungsten Materials”, accepted to Journal of Nuclear Materials. [4] S. Saito, A. M. Ito, A. Takayama, T. Kenmotsu, and H. Nakamura, “Hybrid Simulation between Molecular Dynamics and Binary Collision Approximation Codes for Hydrogen Injection into Carbon Materials”, J. Nucl. Mater, 415, S208-S211, (2011). [5] S. Saito, A. M. Ito, A. Takayama, T. Kenmotsu, and H. Nakamura, “How to Combine Binary Collision Approximation and Multi-Body Potential for Molecular Dynamics”, Progress in Nuclear Science and Technology, 2, 44-50, (2011). [6] S. Saito, A. M. Ito, and H. Nakamura, “Reaction between Graphene and Hydrogen under Oblique Injection”, J. Appl. Phys., 110, 084320, (2011). [7] S. Saito, A. M. Ito, A. Takayama, and H. Nakamura, “Anisotropic Bond Orientation of Amorphous Carbon by Deposition”, Jpn. J. Appl. Phys., 51, 01AC05, (2012). [8] S. Saito, A. Takayama, A. M. Ito, and H. Nakamura, “Finite Temperature Effect on Structural Changes of Single Crystalline Graphite under Plasma Irradiation”, Proc. Int. Conf. Simulation Technology, 46-50, (2012).