ECRIS2020 - List of Keywords (solenoid)

Paper	Title	Other Keywords	Page
MOZZO02	ECR Discharge in a Single Solenoid Magnetic Field as a Source of the Wide-Aperture Dense Plasma Fluxes	plasma, ECR, extraction, experiment	47
	I. Izotov, A. Bokhanov, S. Golubev, M.Yu. Kazakov, S. Razin, R.A. Shaposhnikov, S.P. Shlepnev, V. Skalyga IAP/RAS, Nizhny Novgorod, Russia
	Funding: The reported study was supported by RFBR, project #19-32-90079, and by Presidential Grants Foundation (Grant #MD-2745.2019.2) Sources of dense plasma fluxes with wide aperture are extensively used in applied science, i.e. surface treatment, and as a part of neutral beam injectors. ECR discharge in a solenoidal magnetic field (i.e. with no magnetic mirrors for plasma confinement), sustained by a powerful radiation of modern gyrotrons is under consideration at IAP RAS as a possible alternative to widely used vacuum arc, RF and helicon discharges. The use of a high frequency radiation (37.5 GHz) allows to obtain a discharge at lower pressure, sustain almost fully ionized plasma with density more than 10¹³ cm^-3, whereas the power on the level of several hundreds of kW allows one to create such a plasma in considerably large volume. In the present work fluxes of hydrogen plasma with the equivalent current density of 750 mA/cm² and the total current of 5 A were obtained. A multi-aperture multi-electrode extraction system design capable of forming the non-divergent ion beam was developed with the use of IBSimu code.
	Slides MOZZO02 [0.681 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOZZO02
About •	Received ※ 27 September 2020 — Revised ※ 30 January 2021 — Accepted ※ 13 May 2021 — Issue date ※ 18 May 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUZZO06	Beams with Three-Fold Rotational Symmetry: A Theoretical Study	ECR, ion-source, simulation, dipole	110
	C.Y. Wong ORNL, Oak Ridge, Tennessee, USA S.M. Lund FRIB, East Lansing, Michigan, USA
	Beams from ECR ion sources have 3-fold transverse rotational symmetry induced by the ECR sextupole. The symmetry imposes equality constraints among transverse beam moments, which can be derived using a theoretical framework we developed. Since the constraints are solely a consequence of the rotational symmetry of external fields, they hold for a multi-species beam with arbitrary composition and space charge intensity. These constraints provide a new tool to analyze phase space properties of ECR beams and their impact on low-energy transport. We prove that, regardless of their triangulated spatial density profile, beams with 3-fold rotational symmetry have the same RMS emittance and Twiss parameters along any transverse direction. These counter-intuitive results are applied to the FRIB Front End to show how symmetry arguments challenge long-standing assumptions and bring clarity to the beam dynamics.
	Slides TUZZO06 [0.846 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO06
About •	Received ※ 28 September 2020 — Revised ※ 14 May 2021 — Accepted ※ 18 May 2021 — Issue date ※ 03 November 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOZZO02

ECR Discharge in a Single Solenoid Magnetic Field as a Source of the Wide-Aperture Dense Plasma Fluxes

plasma, ECR, extraction, experiment

47

I. Izotov, A. Bokhanov, S. Golubev, M.Yu. Kazakov, S. Razin, R.A. Shaposhnikov, S.P. Shlepnev, V. Skalyga
IAP/RAS, Nizhny Novgorod, Russia

Funding: The reported study was supported by RFBR, project #19-32-90079, and by Presidential Grants Foundation (Grant #MD-2745.2019.2)
Sources of dense plasma fluxes with wide aperture are extensively used in applied science, i.e. surface treatment, and as a part of neutral beam injectors. ECR discharge in a solenoidal magnetic field (i.e. with no magnetic mirrors for plasma confinement), sustained by a powerful radiation of modern gyrotrons is under consideration at IAP RAS as a possible alternative to widely used vacuum arc, RF and helicon discharges. The use of a high frequency radiation (37.5 GHz) allows to obtain a discharge at lower pressure, sustain almost fully ionized plasma with density more than 10¹³ cm^-3, whereas the power on the level of several hundreds of kW allows one to create such a plasma in considerably large volume. In the present work fluxes of hydrogen plasma with the equivalent current density of 750 mA/cm² and the total current of 5 A were obtained. A multi-aperture multi-electrode extraction system design capable of forming the non-divergent ion beam was developed with the use of IBSimu code.

Slides MOZZO02 [0.681 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOZZO02

About •

Received ※ 27 September 2020 — Revised ※ 30 January 2021 — Accepted ※ 13 May 2021 — Issue date ※ 18 May 2021

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUZZO06

Beams with Three-Fold Rotational Symmetry: A Theoretical Study

ECR, ion-source, simulation, dipole

110

C.Y. Wong
ORNL, Oak Ridge, Tennessee, USA
S.M. Lund
FRIB, East Lansing, Michigan, USA

Beams from ECR ion sources have 3-fold transverse rotational symmetry induced by the ECR sextupole. The symmetry imposes equality constraints among transverse beam moments, which can be derived using a theoretical framework we developed. Since the constraints are solely a consequence of the rotational symmetry of external fields, they hold for a multi-species beam with arbitrary composition and space charge intensity. These constraints provide a new tool to analyze phase space properties of ECR beams and their impact on low-energy transport. We prove that, regardless of their triangulated spatial density profile, beams with 3-fold rotational symmetry have the same RMS emittance and Twiss parameters along any transverse direction. These counter-intuitive results are applied to the FRIB Front End to show how symmetry arguments challenge long-standing assumptions and bring clarity to the beam dynamics.

Slides TUZZO06 [0.846 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO06

About •

Received ※ 28 September 2020 — Revised ※ 14 May 2021 — Accepted ※ 18 May 2021 — Issue date ※ 03 November 2021

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)