1 - Nuclear Sciences and Applications - IAEA

32 BELL et al.
"5?
A
O
3 _ - O
D
C 2 -
1 --
1
1.0-
1.2-
1.4-
1.6-
I I
1.1 MA
1.3
1.5
1.7
AAj
I I
D
D ft
i
.§!
c6
S DD -
" V i
i
0 10 20 30
NEUTRAL INJECTION POWER (MW)
FIG. 2. Scaling of the peak neutron flux from D-D fusion reactions with neutral beam injection power.
Some discharges with current ramping during the NBI pulse are included.
o
Z. 2
1 -
A
O
_ o D
1.0-
1.2-
1.4-
1.6-
i i
1.1 MA
1.3
1.5
1.7
I I
10
(mag),2
(E (MJ
tot '
2 )
I
I
15 20
F/G. 5. Scaling of the peak neutron flux with the square of the peak stored energy for the intersection
of the data sets in Figs. 1 and 2.
achievement of good confinement is a reduction in hydrogen isotope recycling
at the limiter. In the degassing procedure described in Refs. [2], [7],
and [9], low-density helium discharges at modest plasma current are used
to remove deuterium from the surface layers of the graphite limiter. This
degassing is evidenced by a drop in D/3 emission and a reduction in the de-