Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatial heterogeneity of W transmutation in a fusion device   Accurately quantifying the transmutation rate of tungsten (W) under neutron
irradiation is a necessary requirement in the assessment of its performance as
an armour material in a fusion power plant. The usual approach of calculating
average responses, assuming large, homogenised material volumes, is
insufficient to capture the full complexity of the transmutation picture in the
context of a realistic fusion power plant design, particularly for rhenium (Re)
production from W. Combined neutron transport and inventory simulations for
representative {\it spatially heterogeneous} models of a fusion power plant
show that the production rate of Re is strongly influenced by the local spatial
environment. Localised variation in neutron moderation (slowing down) due to
structural steel and coolant, particularly water, can dramatically increase Re
production because of the huge cross sections of giant resolved resonances in
the neutron-capture reaction of \(^{186}\)W at low neutron energies.
Calculations using cross section data corrected for temperature (Doppler)
effects suggest that temperature may have a relatively lesser influence on
transmutation rates.

15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph