LASL INTENSE 14-MeV NEUTRON SOURCE. Page: 4 of 12
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LASL INTENSE 14-MEV NEUTRON SOURCE
Dale B. Henderson
At least two independent suggestions have been made to build a 14-14eV
neutron source at 104 to 1015 neutrons/cm2-sec for materials damage
studies related to fusion power reactors. Greater detail of the LASL
suggestion is presented here than in our earlier report. A feasibility
study is proposed in which such a 14 MeV source would be thoroughly in-
The need for neutron sources suitable to study
Damage phenomena anticipated in fusion reactor
tructural materials has been, by now, well estab-
ished. The latest estimate from the Scyllac group,
'or instance, is that the wall of a prototype pulsed
I-T reactor would sustain a flux of 14.06 MeV neu-
rons equal to 2.7 x 1014 neut/cm2-sec (at one pulse
er second).1 Other estimates span the range from
O1" to 1015 neut/cm-2sec at 14 MeV. There are sev-
ral anticipated and perhaps also some unexpected
damage mechanisms which will be important at such
luxes and energies. The microscopic damage effects
transmutations to other metals, transmutation to
elium and hydrogen, production of lattice vacancies
ad interstitials, etc.) will interact with the host
aterial, with each other, and with effects due to
he material temperature and stress fields in a very
anplicated way. The resulting effects of engineer-
ng interest - swelling, reduced ductility, enhanced
reep rates, modified strength, etc. - are expected
to be very important, but are impossible to predict
from knowledge of the microscopic effects. It is
for this reason that a neutron source is needed
which can provide the correct flux and energy spec-
trum to samples which may be maintained at the ap-
propriate temperature under the appropriate stress
Such a source is quite obviously a variant of
the Cockcroft-Walton D-T source, in continuous op-
eration at a thousand times the present day maximum
intensity, with enough room available close-in to
locate the experimental samples. Such a source was
proposed for fusion reactor application by Colombant
and Lidsky2 and then again in the present context at
LASL by Dreicer and Henderson.3
The present report summarizes the ideas which
underlay our earlier report with some improvements
in the calculations. It also locates certain LASL
expertise and facilities which could be brought to
bear on a program to actually build such a source.
These include extensive special experience with
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Henderson, D.B. LASL INTENSE 14-MeV NEUTRON SOURCE., report, January 1, 1972; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1026021/m1/4/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.