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#131
Considerations for the installation of MANTIS in AUG Oral
Andres Orduna Martinez (Max Planck Institute for Plasma Physics)
A. Burckhart, G. Papp, W. Roog, T. Wijkamp, M. Hoppe, A. Perek, T. Lunt, R. Dux, T. P ̈utterich, G. Pautasso, J. Illerhaus, and the ASDEX Upgrade Team
SCHEDULED This contribution is scheduled to be presented on Monday 10th 11:35-12:00
Abstract
Study of runaway electron (RE) dynamics in present-day tokamak experiments requires the analysis of RE distribution function. Reconstruction of RE distribution func tion has been done on TCV using multi-spectral imaging systems [1, 2]. Furthermore, AUG synchrotron spot radiation has been analysed using a single 10 nm width filter [3]. Based on this results, synthetic diagnostic simulations have been done to assess the relevance of a dedicated diagnostic for synchrotron spot radiation at AUG [4]. As a consequence, a MANTIS [5] having 6 channels will be installed in AUG to investigate RE beam dynamics. Therefore, a number of considerations have to be taken into account prior installation. Filters have to be selected to observe the synchrotron radiation while avoiding strong line radiation. An optical system needs to be selected based on its reliability during disruptions under a considerable neutron flux. A compromise between image resolution and sampling rate has to be found. Potential ports have to be pointed out based on the intensity contribution of the REs to the corresponding region of the distribution function. To asses the mentioned considerations, synthetic diagnostic simulations have been done using SOFT [6] to determine the filters central wavelengths and width, image resolution and camera locations that are best suited for the RE distribution recon struction. For the design of the optical system, a number of technical considerations such as wavelength transmission, neutron radiation induced absorption, and optical properties recovering mechanisms are assessed. [1] T. A. Wijkamp. “Multispectral imaging for the mitigation of tokamak damage by plasma exhaust and runaway electrons”. Phd Thesis. 2024. isbn: 978-94-6496-071-6. [2] T.A. Wijkamp et al. “Tomographic reconstruction of the runaway distribution function in TCV using multispectral synchrotron images”. In: Nuclear Fusion 61.4 (2021), p. 046044. doi: 10. 1088/1741-4326/abe8af. url: https://dx.doi.org/10.1088/1741-4326/abe8af. [3] M. Hoppe et al. “Spatiotemporal analysis of the runaway distribution function from synchrotron images in an ASDEX Upgrade disruption”. In: Journal of Plasma Physics 87.1 (2021). issn: 1469-7807. doi:10.1017/s002237782000152x. url: http://dx.doi.org/10.1017/S002237782000152X. [4] W. J. Roog. “Synchrotron imaging as a diagnostic for runaway electron distribution on ASDEX Upgrade”. MSc Thesis. 2023. [5] A. Perek. “Development and application of quantitative multispectral imaging in nuclear fusion research”. Phd Thesis). 2022. isbn: 978-90-386-5490-4. [6] M. Hoppe et al. “SOFT: a synthetic synchrotron diagnostic for runaway electrons”. In: Nuclear Fusion 58.2 (2018), p. 026032. doi: 10.1088/1741-4326/aa9abb. url: https://dx.doi.org/ 10.1088/1741-4326/aa9abb.
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