Talk-Polywell.org

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http://www.newscientist.com/article/dn1 ... power.html

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This is different to sputtering. You get sputtering, which is fine atomic/gaseous/plasma which will contaminate the plasma. This is talking about micron-sized dust particles that are caused by the slow physical embrittlement and disintegration of the wall. You'll get both types of contamination.