Abstract
Thermal desorption of helium from graphite irradiated with 20 keV He + ions and surface erosion caused by ion irradiation have been studied. After He + ion irradiation, localized protrusions and uniform domed surface uplifting were observed on isotropic graphite at irradiation doses of 5.0 × 10 17 ions/cm 2 and 5.0 × 10 18 ions/cm 2 , respectively. The peak temperatures in thermal desorption curves have a tendency to rise with irradiation dose, and become constant at about 330°C for irradiation doses above 5.0 × 10 17 ions/cm 2 . Thermal desorption of helium considerably depends on the structure of graphite samples studied here. Glassy carbon and graphitized paper (PAPYEX) retained only 22% and 12% of the helium retention of isotropic graphite, respectively.
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