Speaker
Gerarda Maria Apruzzese
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.1025.pdf
45 EPS Conference on Plasma Physics 12696
Visible spectroscopy with liquid tin limiter on FTU plasma
G.M. Apruzzese , M.L. Apicella , M. Iafrati , G. Mazzitelli , F.Bombarda , L.Gabellieri , A.
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Romano and FTU Team
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ENEA, Fusion and Technologies for Nuclear Safety Department,
C.R. ENEA Frascati, via E. Fermi 45, 00044 Frascati (Rome), Italy
In the Frascati Tokamak Upgrade (FTU), two different liquid metals, as plasma facing
materials, have been studied, lithium and tin. The successful experiments with liquid lithium
limiter, started since 2006, have pointed out the importance to explore other liquid metal
materials such as tin whose operating window is much larger than that of lithium. The liquid
tin limiter, TLL, has been tested on FTU in the experimental campaign, started at the end of
2016 [1]. The preliminary analysis of the experimental data has been focused in detecting the
presence of tin in the discharge: suitable monitors are the spectroscopic diagnostics in the
visible, VUV and XUV ranges [2]. The experimental observation of the tin spectral lines
represents a new goal for extending the database of atomic nuclear data in the plasma
tokamak research. The observed spectra are compared with the NIST database. In particular,
the strong spectral lines of SnII, 607.8 nm and 645.3 nm, have been identified together with
other weaker ones in the visible and VUV range, while the XUV spectra have been analysed
and discussed in [3]. Moreover the quantity of the impurity in the plasma, in the presence of
tin limiter, has been analysed. Since the presence of the tin in the discharge is strongly
dependent on the heat load on the TLL, the correlation among the observed spectra and the
heat load on the TLL has been explored. Particular attention has been placed for experiments
with high heat load on TLL, performed operating with high electron density and with
additional heating power. For FTU standard discharges with I = 0.5MA and B = 5.4T, the tin
p T
limiter has been exposed to the plasma with a heat loads up to 18 MW/m , reaching the 2
maximum temperature value of 1700 C. The paper reports on the spectroscopic
o
measurements obtained during experiments with the tin limiter in FTU tokamak.
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Corresponding author: gerarda.apruzzese@enea.it (G.M. Apruzzese)
1. G.Mazzitelli et al., IAEA 2016,’Liquid metal experiments on FTU’,Ex/P8-21
2. G.M.Apruzzese et al., ISLA-V 2017, ‘First spectroscopic results with tin limiter on FTU plasma’, paper
submitted to Plasma Physics Reports
3. F.Bombarda et al.’High Resolution EUV Spectroscopy on FTU with Tin Liquid Limiter’, submitted to
this conference
