A new microwave coupling scheme for high intensity highly charged ion beam production by high power 24–28 GHz SECRAL ion source

Guo, Junwei; Sun, Limin; Zhang, W H; Feng, Y. C.; Shen, Zuojun; Li, L X; Li, J B; Zhang, X Z; Hitz, D.; Zhao, Hongwei

doi:10.1063/1.5131101

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…The source performances in terms of charge states and extracted currents has been explained by taking into account the different patterns of the electromagnetic field that are excited into the cavity, for a specific frequency (or set of frequencies) Mascali et al [9]; Gammino et al [10]. An improved coupling between microwaves and plasma is a key factor to design more powerful electron cyclotron resonance and microwave ion sources Hitz et al [11]; Zhao et al [12]; Xie et al [13]; Guo et al [14]; Mauro et al [15]. As said, the electron density is proportional to the square of the microwave pumping frequency: the higher the frequency the higher the microwave power the source plasma can absorb before the onset of instabilities.…”

Section: The Microwave Injection Systemmentioning

confidence: 99%

An Innovative Superconducting Magnetic Trap for Probing β-decay in Plasmas

et al. 2022

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The main aim of Plasmas for Astrophysics Nuclear Decays Observation and Radiation for Archaeometry (PANDORA) project is to build a compact and 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. One of the most important aspects of an ECR Ion Source (ECRIS) is its magnetic system. In this paper, the numerical design of the PANDORA magnetic system is presented and validated by using the commercial simulators OPERA and CST Studio Suite, showing an excellent agreement between each other in terms of axial and radial field profiles. In conjunction to the magnetic system design, the overall injection system, including the microwave lines for plasma heating and the isotopes injection schemes with a focus on the developments of the oven for solid elements, has been conceived and will be discussed.

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Section: The Microwave Injection Systemmentioning

confidence: 99%

An Innovative Superconducting Magnetic Trap for Probing β-decay in Plasmas

et al. 2022

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“…The source performances in terms of charge states and extracted currents has been explained by taking into account the different patterns of the electromagnetic field that is excited into the cavity, for a specific frequency (or set of frequencies) [1,2]. In order to enhance the source performances, several approaches have been used in the past years, such as the modification of the plasma cavity trying to better match the confining magnetic field profile [3], and the improvement of the microwave injection system by using modified or better cavity-matched waveguide configurations [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Slotted Waveguide Antenna Radiating in a “Plasma-Shaped” Cavity of an ECR Ion Source

Mauro

Torrisi

Leonardi

et al. 2021

Telecom

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The design of a microwave antenna sustaining a high-energy-content plasma in Electron Cyclotron Resonance Ion Sources (ECRISs) is, under many aspects, similar to the design of a conventional antenna but presenting also peculiarities because of the antenna lying in a cavity filled by an anisotropic plasma. The plasma chamber and microwave injection system design plays a critical role in the development of future ECRISs. In this paper, we present the numerical study of an unconventionally shaped plasma cavity, in which its geometry is inspired by the typical star-shaped ECR plasma, determined by the electrons trajectories as they move under the influence of the plasma-confining magnetic field. The cavity has been designed by using CST Studio Suite with the aim to maximize the on-axis electric field, thus increasing the wave-to-plasma absorption. As a second step, an innovative microwave injection system based on side-coupled slotted waveguides is presented. This new launching scheme allows an uniform power distribution inside the plasma cavity which could lead to an increase of ion source performances in terms of charge states and extracted currents when compared to the conventional axial microwave launch scheme. Finally, the use of both the “plasma-shaped” cavity and the microwave side coupled scheme could make the overall setup more compact.

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Overview of high intensity ion source development in the past 20 years at IMP

Sun

Zhao

Hongwei

et al. 2020

Review of Scientific Instruments

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Ion source development over the last 20 years at the IMP is reviewed. For versatile purposes, several types of ion sources have been involved in the research and development work at the IMP, i.e., the highly charged ECR (Electron Cyclotron Resonance) ion source, intense microwave ion source or the 2.45 GHz intense beam ECR ion source, and laser ion source (LIS). In the development of ECR ion sources, SECRAL (Superconducting ECR ion source with Advanced design in Lanzhou), Lanzhou ECR ion source, and Lanzhou all permanent magnet ECR ion source series have been made, which can cover the operation microwave frequency range of 10–28 GHz. The LIS with an Nd:YAG laser with a maximum output energy of 8 J in 8 ns pulse duration has been developed for very intense short pulse ion beams from solid materials such as C, Ti, Ni, Ag, and so on. Microwave ion sources have been built to produce intense pulsed or direct current beams from several mA to 100 mA for either high intensity accelerators or applications. This paper will give an overview of the high intensity ion source development at the IMP, especially on the recent progress and new results, such as the status of the fourth generation ECR ion source (first fourth generation ECR ion source), the production of recorded highly charged ion beams with SECRAL sources, key technology research studies, and so on.

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A new microwave coupling scheme for high intensity highly charged ion beam production by high power 24–28 GHz SECRAL ion source

Cited by 9 publications

References 15 publications

An Innovative Superconducting Magnetic Trap for Probing β-decay in Plasmas

An Innovative Superconducting Magnetic Trap for Probing β-decay in Plasmas

Design and Analysis of Slotted Waveguide Antenna Radiating in a “Plasma-Shaped” Cavity of an ECR Ion Source

Overview of high intensity ion source development in the past 20 years at IMP

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