Russ Doerner - Controlled Fusion Atomic Data Center

T retained in Be rich codeposits can be more
easily removed during divertor bakeout
D/Be in codeposits (at. %)
1 10 100
Baldwin et al.
PSI-16 Maine USA (2004)
J. Nucl. Mater. (accepted)
50 o C (O ~ 3 at. %)
ITER bake
150 o C (O ~ 30 at. %)
Co-deposited a:CH layer
Causey et al. J. Nucl.
Mater. 176-7 (1990) 987
300 o C (O ~ 33 at. %)
1 10 100
H/C in codeposits (at. %)
• Although more hydrogen
isotopes are retained during
lower temperature
codeposition, they are more
easily desorbed
• ITER can bake divertor to
375°C (after coolant drain)
• Codeposits will be in line-ofsight
of erosion location
200 400 600 800 1000
• Oxygen bake may not be
Temperature ( o C)
needed
UCSD
University of California San Diego
R. Doerner, March 22, 2005
PSIF workshop, ORNL