| Paper | Title | Page |
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| MOD2 | Characterization of the ECR ion source LEGIS extraction system and its low energy beam transport line at Legnaro National Laboratories | 22 |
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| At INFN-Legnaro National Laboratories the heavy ions accelerator complex is fed with beams produced by a permanent magnet ECR source called LEGIS (LEGnaro ecrIS). Although suitable intensities and charge states to fulfil the requests of the users are normally guaranteed, the first part of the Low Energy Beam Transport line (LEBT) downstream of the ion source suffers from non-negligible losses and a lack of scalability when switching between ions with different mass-to-charge ratios, thus leading to a machine preparation time longer than would be desirable. These criticalities called for a deep characterization of the beam coming out from the ion source, especially in the case of high charge states heavy ions production, normally showing the lowest intensities. This contribution describes the numerical studies performed on the extraction system of the LEGIS source and its LEBT. The physics case used is a ²⁰⁸Pb³¹⁺ beam produced for a nuclear physics experiment in fall 2022. As will be shown, the results shed light on the reasons for the bad reproducibility and transmission, mostly due to aberrations induced on the extracted beam by the first optical elements. | ||
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Slides MOD2 [7.465 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ECRIS2024-MOD2 | |
| About • | Received ※ 04 October 2024 — Revised ※ 16 October 2024 — Accepted ※ 29 January 2025 — Issued ※ 15 June 2025 | |
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TUA3 |
The electrostatic deceleration of ions injected into an ECRIS CB plasma | |
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| The capture of the 1+ beam is a key parameter in the charge breeding process with an ECRIS-Charge Breeder as it greatly influences the 1+N+ conversion efficiency. The shape of the efficiency vs incident ion energy « Delta V » curve originally led to the theory of slowing down of the injected ions essentially by cumulative small-angle scatterings in collisions with the buffer gas ions. Recent experiments carried out with the PHOENIX charge breeder at LPSC tends to show that the electrostatic deceleration plays a greater role than historically considered. For this study, we varied the CB plasma potential by acting on the microwave power parameter and by measuring the optimum injection energy for sodium, rubidium and cesium ions. Both i) the correlation between the plasma potential and optimum injection energy parameters and ii) the independence of the optimum energy value as a function of the incident ion mass support the new model based on a slowing down essentially electrostatic. | ||
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Slides TUA3 [2.588 MB] | |
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| TUB1 | Progress in 3D self-consistent full wave-PIC modelling of space resolved ECR plasma properties | 76 |
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| We present updates of a simulation suite to model in-plasma ion-electron dynamics, including self-consistent electromagnetic (EM) wave propagation and ion population kinetics to study atomic processes in ECR plasmas. The EM absorption is modelled by a heuristic collisional term in the cold dielectric tensor. However, we are stepping beyond the cold approximation, modelling the hot tensor with non-collisional RF wave damping. The tool calculates steady-state particle distributions via a full wave-PIC code and solves for collisional-radiative process giving atomic population and charge state distribution. The scheme is general and applicable to many physics’ cases of interest for the ECRIS community, including the build-up of the charge-state-distribution and the plasma emitted X-ray and optical radiation. We present its last updates and future perspectives, using as a case-study the PANDORA scenario. We report about studying in-plasma dynamics of injected metallic species and radioisotopes ionisation efficiency for different injection conditions and plasma parameters. The code is capable of reconstructing space-resolved plasma emissivity, to be directly compared to plasma emission measurements, and modelling plasma-induced modification of radioactivity. | ||
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Slides TUB1 [21.575 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ECRIS2024-TUB1 | |
| About • | Received ※ 03 October 2024 — Revised ※ 14 October 2024 — Accepted ※ 29 January 2025 — Issued ※ 01 May 2025 | |
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| TUP07 | Modification of the flexible plasma trap for high-intensity metal ion beams production | 105 |
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| NQSTI (National Quantum Science and Technology Institute) is the enlarged partnership on QST established under the National Recovery and Resilience Plan (NRRP) funded by the European Union – NextGenerationEU. In this framework, there is a growing interest in the availability of mA beams of singly charged (1+) metallic ions to realise quantum devices. To satisfy this request, the joint INFN Laboratories LNS and LNL proposed to modify the Flexible Plasma Trap (FPT), installed at LNS, thus transforming it into a simple mirror Electron Cyclotron Resonance Ion Source (ECRIS). This contribution describes the various technical solutions that will be adopted, foreseeing novel radial RF and gas/metal injection systems, focusing particularly on the design and simulations of a flexible extraction system capable of handling different beam intensities and ion species. Specifically, the project targets the production of high-intensity beams of singly charged ions such as Fe⁺, and Ba⁺, highlighting the versatility and innovation of the proposed modifications. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ECRIS2024-TUP07 | |
| About • | Received ※ 09 October 2024 — Revised ※ 15 October 2024 — Accepted ※ 20 January 2025 — Issued ※ 07 March 2025 | |
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| THA2 | Numerical design of an innovative superconducting magnetic trap for probing β-decay in ECR plasmas | 159 |
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| The main aim of Plasmas for Astrophysics Nuclear Decays Observation and Radiation for Archaeometry (PANDORA) project is to build a flexible magnetic plasma trap where plasma reaches a density nₑ ∼ 10¹¹ – 10¹³ cm⁻³, and a temperature, in units of kT, kTₑ ∼ 0.1 – 30 keV in order to measure, for the first time, nuclear β-decay rates in stellar-like conditions. Here we present the numerical design of the PANDORA magnetic system, carried out by using the commercial simulators OPERA and CST Studio Suite. In particular, we discuss the design choices taken to: 1) obtain the required magnetic field levels at relevant axial and radial positions; 2) avoid the magnetic branches along the plasma chamber wall; 3) find the optimal position for the set of plasma diagnostics that will be employed. The magnetic trap has been conceived to be as large as possible, both in radial and axial directions, in order to exploit the plasma confinement mechanism on a bigger plasmoid volume. The plasma chamber will have a length of 700 mm and a diameter of 280 mm. The magnetic trap tender procedure has been completed in June 2024 and the structure realization is expected to start in late 2024. | ||
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Slides THA2 [6.420 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ECRIS2024-THA2 | |
| About • | Received ※ 25 January 2025 — Revised ※ 28 January 2025 — Accepted ※ 30 January 2025 — Issued ※ 15 June 2025 | |
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