Abstract
A plasma based, deuterium and tritium (DT) fueled, volumetric 14 MeV neutron source (VNS) has been considered
as a possible facility to support the development of the demonstration fusion power reactor (DEMO). It can be used
to test and develop necessary fusion blanket and divertor components and provide sufficient database, particularly on
the reliability of nuclear components necessary for DEMO. The VNS device can be complement to ITER by reducing
the cost and risk in the development of DEMO. A low cost, scientifically attractive, and technologically feasible
volumetric neutron source based on the spherical torus (ST) concept has been conceived. The ST-VNS, which has a
major radius of 1.07 m, aspect ratio 1.4, and plasma elongation three, can produce a neutron wall loading from 0.5
to 5 MW m 2 at the outboard test section with a modest fusion power level from 38 to 380 MW. It can be used to
test necessary nuclear technologies for fusion power reactor and develop fusion core components include divertor,
first wall, and power blanket. Using staged operation leading to high neutron wall loading and optimistic availability,
a neutron fluence of more than 30 MW year m 2 is obtainable within 20 years of operation. This will permit the
assessments of lifetime and reliability of promising fusion core components in a reactor relevant environment. A full
scale demonstration of power reactor fusion core components is also made possible because of the high neutron wall
loading capability. Tritium breeding in such a full scale demonstration can be very useful to ensure the self-sufficiency
of fuel cycle for a candidate power blanket concept.
