Flexible vacuum vessel bolometer camera design in ITER to adapt to the final position of the gaps between Blanket Modules

Pataki, A.; Hermann, D.; Ingesson, L. C.; Meister, H.; Nádasi, G.; Penzel, F.; Reichle, R.; Sánchez, J.; Walach, U.

doi:10.1016/j.fusengdes.2019.04.023

Cited by 3 publications

(4 citation statements)

References 1 publication

(1 reference statement)

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“…Locations on the vacuum vessel (VV) wall have challenging interfaces with blanket modules (BM) and require dedicated cut-outs for the camera housing as well as a clear view through the gap between BMs. A detailed investigation on this topic is given in [3]. Locations on divertor cassettes need to consider the remote-handling (RH) movements of cassettes during installation which significantly constrict the space envelopes available for bolometer cameras.…”

Section: Overview Of the Iter Bolometer Diagnosticmentioning

confidence: 99%

Performance estimations for the ITER bolometer diagnostic

Meister

Penzel

Szabo-Balint

et al. 2019

Fusion Engineering and Design

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The ITER bolometer diagnostic shall provide the measurement of the total radiation emitted from the plasma, a part of the overall energy balance. Up to 550 lines-of-sight (LOS) will be installed in ITER observing the whole plasma from many different angles to enable reliable measurements and tomographic reconstructions of the spatially resolved radiation profile. The performance of the diagnostic is intimately linked to the constraints imposed by the design requirements, the sensor and data acquisition design, as well as expected noise levels.The results presented contain the estimated signal intensities for the current design and integration of bolometer cameras in ITER, based on the simulated radiation profile for the ITER standard scenario (DT-plasma at 15 MA, 500 MW with low impurity content). The corresponding power deposited onto the absorber ranges between 0.5 µW and 2 mW. The expected noise levels derived mainly from lab measurements and compared to operating bolometer systems yield estimated values for ITER in the order of 1 µW, clearly indicating a need for optimizing the diagnostic.The optimization potential is discussed. Cameras for which the light yield could be increased are identified. Also, the potential for enhancing the sensitivity by using different absorber thicknesses is explored.

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Section: Overview Of the Iter Bolometer Diagnosticmentioning

confidence: 99%

Performance estimations for the ITER bolometer diagnostic

Meister

Penzel

Szabo-Balint

et al. 2019

Fusion Engineering and Design

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“…An interlayer between the camera platform and the VV has to ensure a good thermal contact. More details on the design are given in [1].…”

Section: Fig 1 Vv Bolometer Camera Housing -Exploded Drawingmentioning

confidence: 99%

“…The bolometer cameras are located at the walls of the structure facing the plasma. Considered in detail, the cameras will be installed in equatorial port 1, in the upper ports 1 and 17, in 5 divertor cassettes (18, 26, 44, 49 and 54) and behind blanket modules (BM) in the vacuum vessel sectors: 1, 3, 4, 6, 8 and 9 [1]. Overall, 71 cameras are delivering 550 lines of sight (LOS).…”

Section: Introductionmentioning

confidence: 99%

On structural analyses of the ITER vacuum vessel bolometer camera housing conceptual design

Jakšić

Meister

Penzel

et al. 2019

Fusion Engineering and Design

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The ITER bolometer provides an absolutely calibrated measurement of the radiation emitted by the plasma, which is a part of the total energy balance. The development is especially challenging because of the extreme environmental conditions within the vacuum vessel (VV) during plasma operation. The bolometer has to guarantee reliable measurements within an environment characterized by high neutron flux as well as temperatures exceeding 200°C. In addition to the thermal loads, the bolometer body is exposed to the mechanical loads caused by electromagnetic forces during transient events of plasma disruption. This paper describes a possible procedure for a structural analysis of the bolometer camera body. To examine all-important structural properties of the bolometer body, a multiple nonlinear finite element model based on a CAD conceptual design has been generated. Subsequently, a transient mechanical analysis has been performed using the finite element code ANSYS. A general electromagnetic model, taking into account the contribution of all structural parts and electromagnetic loading starting with the DINA code, generated the input for the analysis. From the wide range of DINA results, the worst-case load scenario has been chosen. The results of the structural analysis regarding the camera housing structural integrity are presented and discussed here.

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“…22 cameras are mounted directly to the Vacuum Vessel (VV) surface distributed on six different sectors (S01, S03, S04, S06, S08, S09) of ITER. The design principle of these different cameras has been shown previously in several publications: VV cameras [2], PP cameras [3] and divertor cameras [4]. This paper will present the final design of the first component of the ITER bolometer diagnostic of the VV cameras, the cable installation template (CIT) which is a First Plasma (FP) component.…”

Section: Introduction To the Iter Bolometers And The Need Of A Cable ...mentioning

confidence: 96%

Final design of the ITER bolometer first plasma component: cable installation template

et al. 2021

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The ITER bolometer cable installation template is a first plasma component which main function is to provide a temporary fixation of the mineral insulated cables and to protect them through first plasma operation inside the vacuum vessel until the final bolometer cameras are installed in the second assembly phase. In this paper, the final design of the cable installation template will be presented, the assembly procedures and important functional design details in order to be compliant with its interfaces, the vacuum vessel, the flux loops, the electrical services, the first plasma components and the assembly. Requirements that drive the design will be explained, along with the technical solutions chosen to fulfill them. Important sub-components will be presented in more detail, such as the boss fixation, which will compensate geometrical uncertainties of the as-built boss positioning, as well as the mineral insulated cable holder, which will prepare the electrical termination and facilitate the installation of final vacuum vessel cameras during the second assembly phase of ITER. Additionally, the step-by-step assembly plan agreed with the team of ITER machine assembly and tooling will be described. A custom developed boss welding tool will be described as well. The system load specifications applicable for this first plasma component will be presented as well and an overview of the structural integrity analysis report will be given. It will be shown that most loads on the component are very limited and there is no risk of structural failure or loss of relevant system functions. The paper concludes with a summary of the work and an overview of the procurement and delivery status to ITER.

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Flexible vacuum vessel bolometer camera design in ITER to adapt to the final position of the gaps between Blanket Modules

Cited by 3 publications

References 1 publication

Performance estimations for the ITER bolometer diagnostic

Performance estimations for the ITER bolometer diagnostic

On structural analyses of the ITER vacuum vessel bolometer camera housing conceptual design

Final design of the ITER bolometer first plasma component: cable installation template

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