Abstract
The first in-depth investigation of surface modification of materials by continuous, high-flux argon plasma bombardment under simultaneous erosion and redeposition conditions have been carried out for copper and 304 stainless steel using the PISCES facility. The plasma bombardment conditions are: incident ion flux range from 10 17 to 10 19 ions s −1 cm −2, total ion fluence between 10 19 and 10 22 ions cm −2, electron temperature range from 5 to 15 eV, and plasma density range from 10 11 to 10 13 cm −3. The incident ion energy is 100 eV. The sample temperature is between 300 and 650 K. Under redeposition-dominated conditions, the material erosion rate due to the plasma bombardment is significantly smaller (by a factor up to 10) than expected from the classical ion beam sputtering yield data. It is found that surface morphologies of redeposited materials strongly depend on the plasma bombardment condition. The effect of impurities on surface morphology is elucidated in detail. First-order models are implemented to interpret the reduced erosion rate and the surface morphology evolution. Also, fusion related surface properties of redeposited materials such as hydrogen reemission and plasma driven permeation have been characterized.
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