| Paper | Title | Page |
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| TUZZO01 | Characterization of 2.45 GHz ECR Ion Source Bench for Accelerator-Based 14-MeV Neutron Generator | 95 |
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| The 2.45 GHz Electron Cyclotron Resonance Ion Source (ECRIS) has been indigenously developed. This development of ECRIS aims to provide high brightness, stable, and reliable D+ ion beam of 20 mA beam current in a continuous (CW) mode operation for an accelerator-based D-T neutron generator. The ECR ion source setup consists of a microwave system, a magnet system, a double wall water-cooled plasma chamber, a high voltage platform, a three-electrode ion extraction system, and a vacuum system. The ECR ion source test setup is installed, and the deuterium plasma is generated. A three-electrode extraction system is designed and fabricated for the ion beam extraction. A ~10 mA deuterium ion beam is extracted from the ECR ion source. The paper covers the detailed experimental setup of ion beam characterization and diagnostics used for measurement of beam profile, beam current, and beam emittance measurements. It also covers the latest results of beam emittance measurements. | ||
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Slides TUZZO01 [0.727 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO01 | |
| About • | Received ※ 29 September 2020 — Revised ※ 23 December 2020 — Accepted ※ 19 May 2021 — Issue date ※ 28 June 2022 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
| TUZZO06 | Beams with Three-Fold Rotational Symmetry: A Theoretical Study | 110 |
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| 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. | ||
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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) | |
| WEWZO05 | Beam Profile Measurements of Decelerated Multicharged Xe Ions from ECRIS for Estimating Low Energy Damage on Satellites Components | 125 |
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Electron cyclotron resonance ion source (ECRIS) has been constructed for producing synthesized ion beams in Osaka Univ.*,** Xe is used as fuel for ion propulsion engines on artificial satellites. There are problems of accumulated damages at irradiation and sputtering by low energy Xe ion from the engine. It is required to construct experimentally sputtering yield databases of ion beams in the low energy region from several hundred eV to 1keV, since there are not enough data of satellite component materials. Therefore, we are trying to investigate experimentally sputtering yield on materials by irradiating the low energy single species Xeq+ ion beams. However, there is a problem that if the low extraction voltage, the amount of beam currents is not enough to obtain ion beam flux for precise evaluation of sputtering yield data. Thus, we conduct to decelerate Xeq+ ion beams required low energy region after extracting at high voltage, e.g., 10kV. We measured the decelerated beam profile with x and y direction wire probes. As a result, we were able to estimate the dose of ion fluxes. We are going to conduct irradiation experiments on various materials.
*Y. Kato, et al., RSI, 2014, 85, 02A950-1-3. **Y. Kato, et al., RSI, 2016, 87, 02A710-1-4. |
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Slides WEWZO05 [8.964 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO05 | |
| About • | Received ※ 27 September 2020 — Revised ※ 25 September 2020 — Accepted ※ 29 September 2020 — Issue date ※ 14 July 2022 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
WEXZO01 |
High Intensity Ion Beam Extraction System for FECR | |
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| To meet the beam requirements of High Intensity heavy ion Accelerator Facility (HIAF), the Institute of Modern Physics is developing a Fourth generation ECR ion source (FECR). Targeting at the operation frequency of 45 GHz, FECR is expected to produce very high intensity highly charged heavy ion beams, such as 1.0 emA 238U35+, 2 emA 78Kr19+, 10 emA 16O6+, etc. Based on the records with the 3rd generation ECR ion source operating at 24-28 GHz, the corresponding total drain current of FECR could reach 20-60 emA. To extract such high intensity multi-charged ion beams from the source with high beam quality and transmission efficiency, conventional diode or triode extraction system might not be suitable, and therefore a 4-electrode extraction system with a total extraction voltage of 50 kV is designed to mitigate the space charge influences and minimize the beam emittance growth in the extraction region. In this paper, a 3D model of the FECR extraction system is built using the IBSimu code. The electrode angles, voltages and electrode spacings are optimized for different ion beam conditions respectively. Beam properties comparison of various simulation conditions are presented. | ||
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Slides WEXZO01 [7.712 MB] | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |