Nuclear analysis of the DEMO divertor survey visible high-resolution spectrometer

Luís, R.; Nietiadi, Yohanes; Silva, A.; Gonçalves, Bruno; Franke, Thomas; Biel, W.

doi:10.1016/j.fusengdes.2021.112460

Cited by 3 publications

(4 citation statements)

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“…The flux and dose rate values in the port cell are more than three orders of magnitude higher than those obtained with the reference model of the port without diagnostics (neutron fluxes below 1 × 10 7 n cm −2 s −1 were obtained in the port cell with the reference model). For the remaining port diagnostics, the design of the first doglegs is effective to reduce the streaming, as shown in a previous study [25].…”

Section: Neutron Fluxes Gamma Fluxes and Dose Rates In The Port Cellsupporting

confidence: 53%

“…Previous studies have been published with neutronics simulations for the DSC concept [17,23,24], but with limited results for the full DSC and its impact on the neutron and gamma fluxes in the VV. A work focused on an early design of the divertor survey visible high-resolution spectrometer has also been published, which aimed mainly to assess the loads in the first mirrors and the impact of the number of doglegs in the EP ducts on the radiation streaming to the port cells [25]. The objective now is to extend those simulations to more complex geometries and to include additional diagnostics that were not studied before.…”

Section: Introductionmentioning

confidence: 99%

“…The remaining diagnostics have much smaller openings in the first wall (all below 28 cm 2 ). Furthermore, they have doglegs, which will reduce streaming to the port cells, as shown before [25].…”

mentioning

confidence: 99%

“…The first wall has 2 mm thick armor made of tungsten, with a second layer of 6.09% water and 93.91% EUROFER, taken directly from the definition of the WCLL BB which follows Most of the materials used in the equatorial port model are summarized in Figure 27 The first wall has 2 mm thick armor made of tungsten, with a second layer of 6.09% wate and 93.91% EUROFER, taken directly from the definition of the WCLL BB which follow The remaining diagnostics have much smaller openings in the first wall (all below 28 cm 2 ). Furthermore, they have doglegs, which will reduce streaming to the port cells, as shown before [25].…”

mentioning

confidence: 99%

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Neutronics Simulations for DEMO Diagnostics

Luís

Nietiadi

Quercia

et al. 2023

Sensors

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One of the main challenges in the development of a plasma diagnostic and control system for DEMO is the need to cope with unprecedented radiation levels in a tokamak during long operation periods. A list of diagnostics required for plasma control has been developed during the pre-conceptual design phase. Different approaches are proposed for the integration of these diagnostics in DEMO: in equatorial and upper ports, in the divertor cassette, on the inner and outer surfaces of the vacuum vessel and in diagnostic slim cassettes, a modular approach developed for diagnostics requiring access to the plasma from several poloidal positions. According to each integration approach, diagnostics will be exposed to different radiation levels, with a considerable impact on their design. This paper provides a broad overview of the radiation environment that diagnostics in DEMO are expected to face. Using the water-cooled lithium lead blanket configuration as a reference, neutronics simulations were performed for pre-conceptual designs of in-vessel, ex-vessel and equatorial port diagnostics representative of each integration approach. Flux and nuclear load calculations are provided for several sub-systems, along with estimations of radiation streaming to the ex-vessel for alternative design configurations. The results can be used as a reference by diagnostic designers.

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Section: Neutron Fluxes Gamma Fluxes and Dose Rates In The Port Cellsupporting

confidence: 53%