A preliminary exploration of edge plasma current profile reconstruction from the atomic beam probe diagnostic

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F26%3A00648111" target="_blank" >RIV/61389021:_____/26:00648111 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0920379625007070" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0920379625007070</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.fusengdes.2025.115511" target="_blank" >10.1016/j.fusengdes.2025.115511</a>

Result language

angličtina

Original language name

A preliminary exploration of edge plasma current profile reconstruction from the atomic beam probe diagnostic

Original language description

The atomic beam probe (ABP) (Berta et al., 2013, Hacek et al., 2018, Réfy et al., 2019) is a diagnostic technique for plasma edge current density fluctuation measurement. Similarly to the imaging heavy ion beam probe (iHIBP) (Birkenmeier et al., 2019, Galdon-Quiroga et al., 2017, Galdon-Quiroga et al., 2024, Oyola et al., 2024), the technique is based on an atomic beam which is injected into the plasma. Along their path in the plasma, the atoms become ionized, and the resulting ion beam is deflected from the straight path by the electromagnetic forces, following a curved path and eventually leaving the plasma where its spatial current distribution can be measured by an appropriate detector system. Such a detector system was installed on the COMPASS tokamak (Pánek et al., 2016) based on a Faraday cup matrix (ABP (Réfy et al., 2019)), as well as a scintillator-based system on the ASDEX Upgrade tokamak (iHIBP (Galdon-Quiroga et al., 2024)) and on the HL-2A tokamak (Wu et al., 2022). The modeling of the ion beam distribution at the detector, knowing the plasma, the beam and the detector parameters is straightforward by integrating the equation of motion, and is called the forward problem. However, the inverse problem, namely the reconstruction of plasma parameters which affect the ion's paths, knowing the ion distribution fluctuation on the detector, the equilibrium magnetic field, the beam and the detector parameters is challenging, and has not been addressed yet. The motivation of this work is that some properties of the plasma edge current can be reconstructed by investigating the inverse problem. The results of such a diagnostic can have a strong impact on our understanding of the ELM-cycles or advanced plasma scenarios through the validation of the theoretical models since the diagnostic capabilities with sufficiently high time resolution for plasma edge current density are very limited. In this work we discuss the possibility of reconstructing some properties of the plasma edge current and analyze under which conditions is the reconstruction feasible. We write the governing equations of the ion motion in the plasma and formulate the inverse problem in theory. We support our analysis with forward calculations on the COMPASS tokamak device.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10304 - Nuclear physics

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2026

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Fusion Engineering and Design

ISSN

0920-3796

e-ISSN

1873-7196

Volume of the periodical

222

Issue of the periodical within the volume

January

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

6

Pages from-to

115511

UT code for WoS article

001621627200001

EID of the result in the Scopus database

2-s2.0-105021482772