Suppressing of Co-Extracted Electrons in a Negative Ion Source-Numerical Simulation

• Autorzy: Turek Marcin , Węgierek Paweł

Identyfikatory

DOI

10.12913/22998624/152821

• Języki publikacji: EN

Abstrakty

EN

Electron co-extraction and suppression by a transverse magnetic fields is studied within a two dimensional particle-in-cell numerical model of surface ionisation ion source with beveled extraction opening. A novel approach of data presentation is proposed, based on the fact that dependences of co-extracted current on the filter strength could be approximated by four parameters only, describing e.g. initial electron current value and cut-off B value. In the paper the influence of extraction system geometry is considered – it is shown that the cut-off B value increases with the size of the opening in the extraction electrode, while the inclination of the extraction opening walls does not play any significant role. It is demostrated that the most of electron is eliminated by hiting the extraction electrode walls, however up to 30 % of electrons were lost by encountering the extraction channel walls due to the modification of their trajectories by the filter field. The influence of the magnetic filter field placement is also investigated – the center of the filter field has to be no further than 2 mm form the extraction channel orifice in order to achieve minimal values of the cut-off field (~20 mT). The possibly low extraction voltages are preferable, as the ammount of co-extracted electrons grows rapidly with Vext resulting in e.g. threefold increase of cut-off parameter value when extraction voltage is changed from 1 kV up to 10 kV. Within the considered model the filter field does not have any significant influecne on extracted H- current.

Słowa kluczowe

EN

particle-in-cell simulations; negative ion source; ion beam extraction

• Wydawca: Lublin University of Technology ; Polish Society of Ecological Engineering (PTIE), Branch of PTIE in Lublin
• Czasopismo: Advances in Science and Technology. Research Journal
• Rocznik: 2022
• Tom: Vol. 16, no 5
• Strony: 1--10
• Opis fizyczny: Bibliogr. 36 poz., fig.

Twórcy

autor

Turek Marcin

• Institute of Physics, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

autor

Węgierek Paweł

• Faculty of Electrical Engineering and Computer Science, Lublin University of Technology ul. Nadbystrzycka 38 D, 20-618 Lublin, Poland

• https://orcid.org/0000-0002-0812-3414

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).