High-flux deuterium plasma exposure tests of actively-cooled divertor plate units in PISCES-B

摘要

An actively-cooled divertor plate mock-up with three kinds of carbon-based armor tiles (IG430U, MFC-1, and CX2002U) designed and fabricated by JAERI was bombarded with steady-state and high-flux deuterium plasmas produced in UCLA PISCES-B. The plasma densities, electron temperatures, and ion fluxes were measured from 1 to 3x10(sup 19) m(sup -3), from 4 to 12 eV, and from 1.2 to 2.1x10(sup 23) ions/m(sup 2)s, respectively. The total ion fluence was of the order of 10(sup 26) ions/m(sup 2). Interesting surface morphologies have been observed for the plasma-bombarded surfaces, having relatively large agglomerated carbon particles with diameters up to 100 micrometers. The plasma heat flux was measured with a calorimeter embedded in a graphite (IG430U) to range from 1.1 to 4.4 MW/m(sup 2), which is in good agreement with the calculated value with a simple sheath theory. (author). (ERA citation 19:023224)