Magnetic quadrupole simulations for focusing the electron beams emitted by a plasma focus device

Isolan, Lorenzo; Sumini, Marco

doi:10.1016/j.radphyschem.2020.108970

Radiation Physics and Chemistry

2020

DOI: 10.1016/j.radphyschem.2020.108970

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Magnetic quadrupole simulations for focusing the electron beams emitted by a plasma focus device

Lorenzo Isolan

Marco Sumini

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2023

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Cited by 2 publications

References 13 publications

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Low-field NMR with multilayer Halbach magnet and NMR selective excitation

Telfah,

Bahti,

Kaufmann

et al. 2023

Sci Rep

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This study introduces a low-field NMR spectrometer (LF-NMR) featuring a multilayer Halbach magnet supported by a combined mechanical and electrical shimming system. This setup offers improved field homogeneity and sensitivity compared to spectrometers relying on typical Halbach and dipole magnets. The multilayer Halbach magnet was designed and assembled using three nested cylindrical magnets, with an additional inner Halbach layer that can be rotated for mechanical shimming. The coils and shim-kernel of the electrical shimming system were constructed and coated with layers of zirconia, thermal epoxy, and silver-paste resin to facilitate passive heat dissipation and ensure mechanical and thermal stability. Furthermore, the 7-channel shim coils were divided into two parts connected in parallel, resulting in a reduction of joule heating temperatures from 96.2 to 32.6 °C. Without the shimming system, the Halbach magnet exhibits a field inhomogeneity of approximately 140 ppm over the sample volume. The probehead was designed to incorporate a solenoidal mini coil, integrated into a single planar board. This design choice aimed to enhance sensitivity, minimize $${B}_{1}$$ B 1 inhomogeneity, and reduce impedance discrepancies, transmission loss, and signal reflections. Consequently, the resulting linewidth of water within a 3 mm length and 2.4 mm inner diameter sample volume was 4.5 Hz. To demonstrate the effectiveness of spectral editing in LF-NMR applications at 29.934 MHz, we selectively excited hydroxyl and/or methyl protons in neat acetic acid using optimal control pulses calculated through the Krotov algorithm.

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Low-field NMR with multilayer Halbach magnet and NMR selective excitation

Telfah,

Bahti,

Kaufmann

et al. 2023

Sci Rep

View full text Add to dashboard Cite

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Rotating magnetic field configuration for controlled particle flux in material processing applications

Pandey

Agarwal

Joshi

2023

International Journal of Materials Research

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Plasma technology has been an integral part of the semiconductor industries, especially to achieve the desired etch and selectivity of the outcome. These outcomes depend on various factors including the confinement of the charged particles of the plasma source. One of the widely employed confinement schemes is the multipole arrangement of magnetic fields, also known as a multicusp. Such arrangement provides minimum-B field value near the plasma axis and plays significant role in plasma-based ion sources for material processing and in plasma thrusters for spacecraft applications. In the present work, a novel rotating multicusp about its axis is studied to investigate its effect on the confinement of electrons present within it. The multicusp is allowed to rotate with a finite rotational speed, in the range of 0–107 rotation per second, thus inducing an axial electric field. It will lead to a directed axial flux of the electrons, determined by the rotational speed of the multicusp. The dynamics of the electrons enclosed within a rotating multicusp have been studied to explore its radial confinement. The results are of significance for semiconductor industries and others where downstream or afterglow plasmas are utilized for material applications.

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Magnetic quadrupole simulations for focusing the electron beams emitted by a plasma focus device

Cited by 2 publications

References 13 publications

Low-field NMR with multilayer Halbach magnet and NMR selective excitation

Low-field NMR with multilayer Halbach magnet and NMR selective excitation

Rotating magnetic field configuration for controlled particle flux in material processing applications

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