Russ Doerner - Controlled Fusion Atomic Data Center

Be rich surface layers form during exposure
and shield underlying carbon from erosion
T surface = 700ºC T surface = 800ºC
100
100
80
80
60
60
40
40
20
T surface ~ 250C
T surface ~ 700C
20
T surface ~ 900C
T surface ~ 1000C
0
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35
Be plasma concentration (%)
0
0 0.1 0.2 0.3 0.4 0.5
Be plasma concentration (%)
• Be surface concentration after 5000 sec. P-B exposure.
• ITER will have 1-10% Be impurity concentration in the
divertor plasma
UCSD
University of California San Diego
R. Doerner, March 22, 2005
PSIF workshop, ORNL