Outgassing characteristics and composition analysis of aluminum alloy extrudate under electron beam irradiation

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  • Osamu Konno
    Laboratory of Nuclear Science, Tohoku University, 1-2-1, Mikamine, Taihakuku, Sendai 982, Japan
  • Tsutomu Ohi
    Superconducting & Cryogenic, Technology Center, Kobe Steel Ltd., 5-5 Takatukadai 1-chome, Nishiku, Kobe 637-02, Japan

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Abstract

<jats:p>Outgassing characteristics and a combined surface analysis of two kinds of aluminum alloy extrudate produced in both a dry nitrogen shrouding and in air have been examined to investigate their suitability for a beam duct of an electron linear accelerator. Under conditions closely simulating the environment in the accelerator, the outgassing rate and partial pressure have been measured. Auger electron spectroscopy and secondary ion mass spectroscopy have been used to examine the surface composition and depth profile. The maximum outgassing rates per current during 55 μA irradiation were 9.1×10−8 and 1×10−8 (Torr ℓ/s cm2)/μA for the aluminum alloy extrudates produced in air and nitrogen shrouding processes, respectively. There were significant differences in partial pressure of H2, H2O, CO, and CO2 for the two extrudates, which were found to depend on the thickness of the oxide layer on the surface and the surface composition. The Auger and secondary-ion depth profile analysis revealed that after irradiation, the oxide layers on the surfaces were thicker than before irradiation by 15.5 and 40 Å for samples extruded in nitrogen and air, respectively. It seems that the observed changes in surface composition result not only from heating effects but also directly from interactions of the electrons in the alloy.</jats:p>

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