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@ARTICLE{Giacomelli:859893,
author = {Giacomelli, L. and Rigamonti, D. and Nocente, M. and Rebai,
M. and Tardocchi, M. and Cecconello, M. and Conroy, S. and
Hjalmarsson, A. and Franke, T. and Biel, W.},
title = {{C}onceptual studies of gamma ray diagnostics for {DEMO}
control},
journal = {Fusion engineering and design},
volume = {136},
number = {Part B},
issn = {0920-3796},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2019-00710},
pages = {1494 - 1498},
year = {2018},
abstract = {The future tokamak demonstration fusion reactor (DEMO) will
operate at unprecedented physical and technological
conditions where high reliability of the system components
is required. The conceptual study of a suite of DEMO
diagnostics is on-going. Among these, a Gamma-Ray
Spectrometric Instrument (GRSI) is being investigated to
assess its performance and information quality in view of
DEMO control. The GRSI foresees radial-orthogonal multi-line
of sight viewing DEMO plasma across its poloidal section as
a further development of the Gamma-Ray Camera of JET and of
the Radial Gamma-Ray Spectrometers proposed for ITER but
with stricter technological constraints. These include
surface availability in the Tritium Breeding Blankets of
DEMO vessel inner wall for diagnostics collimators openings,
diagnostics distance from the plasma, neutron irradiation
and activation of the reactor structures. On DEMO the
gamma-ray (γ) emission from DT plasmas consists of
T(d,γ)5He (Eγ = 16.63 MeV) and T(p,γ)4He
(Eγ = 19.81 MeV) reactions which for their high Eγ
would allow in principle for background-free measurements.
This work reports the assessment on the GRSI diagnostic
capability. Reactions cross sections are assessed and used
for the calculations of the reactions γ emission energy
spectrum under DEMO DT plasma conditions and compared with
14 MeV neutron emissions before and after the GRSI
collimator. Investigation of the GRSI γ spectrometers
performance is also presented. Measurement of the γ
emission intensity of T(d,γ)5He can be in principle used as
an independent assessment of DEMO DT plasmas fusion power.},
cin = {IEK-4},
ddc = {530},
cid = {I:(DE-Juel1)IEK-4-20101013},
pnm = {174 - Plasma-Wall-Interaction (POF3-174)},
pid = {G:(DE-HGF)POF3-174},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000452575300120},
doi = {10.1016/j.fusengdes.2018.05.041},
url = {https://juser.fz-juelich.de/record/859893},
}