Simulations of ECRIS performance for different working materials

Mironov, V. E.; Bogomolov, S. L.; Bondarchenko, A. E.; Efremov, A.; Kuzmenkov, Konstantin; Loginov, V. N.

doi:10.1088/1748-0221/13/12/c12002

Cited by 3 publications

(5 citation statements)

References 13 publications

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“…12. Threearm pattern is always observed in experiments and had been reproduced already in our previous publications [2]. The main feature in the Fig.…”

Section: Spatial Distributions Of the Ion Densitiessupporting

confidence: 82%

“…Positions of those ions that are lost at the extraction electrode are shown in Fig.12. Threearm pattern is always observed in experiments and had been reproduced already in our previous publications [2]. The main feature in the Fig.12 is a compact spot in the center of distribution and relatively intense strips along the star arms.…”

Section: Spatial Distributions Of the Ion Densitiessupporting

confidence: 79%

“…where E0 is the wave electric field amplitude in vacuum. This estimate comes from the relation between the electromagnetic wave energy flux (I) and the wave electric field amplitude: 𝐼 = 2 in assumption of negligible variation in the microwave power density while it propagates in plasma. It follows from Eqs.1 and 5 that when the wave is approaching the ECR surface in direction from the higher magnetic field, it is slowed down and its amplitude is decreasing.…”

Section: Interaction With Microwavesmentioning

confidence: 99%

“…The ion module uses the PIC-MCC methods to trace movement of ions in the magnetic and internal electric fields of the source [2]. The ions undergo elastic and un-elastic collisions with other ions, neutrals and electrons.…”

Section: General Description and Matching Of The Module Solutionsmentioning

confidence: 99%

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Spatial distributions of plasma potential and density in electron cyclotron resonance ion source

Mironov

Bogomolov

Bondarchenko

et al. 2020

Plasma Sources Sci. Technol.

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The Numerical Advanced Model of Electron Cyclotron Resonance Ion Source (NAM-ECRIS) is applied for studies of the physical processes in the source. Solutions of separately operating electron and ion modules of NAM-ECRIS are matched in iterative way such as to obtain the spatial distributions of the plasma density and of the plasma potential. Results reveal the complicated profiles with the maximized plasma density close to the ECR surface and on the source axis. The ion-trapping potential dips are calculated to be on the level of ~(0.01-0.05) V being located at the plasma density maxima. The highly charged ions are also localized close to the ECR surface. The biased electrode effect is due to an "electron string" along the source axis formed by reflection of electrons from the biased electrode and the extraction aperture. The string makes profiles of the highly charged ions more peaked on the source axis, thus increasing the extracted ion currents.

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“…12. Threearm pattern is always observed in experiments and had been reproduced already in our previous publications [2]. The main feature in the Fig.…”

Section: Spatial Distributions Of the Ion Densitiessupporting

confidence: 82%

Section: Spatial Distributions Of the Ion Densitiessupporting

confidence: 79%

Section: Interaction With Microwavesmentioning

confidence: 99%

Section: General Description and Matching Of The Module Solutionsmentioning

confidence: 99%

See 2 more Smart Citations

Spatial distributions of plasma potential and density in electron cyclotron resonance ion source

Mironov

Bogomolov

Bondarchenko

et al. 2020

Plasma Sources Sci. Technol.

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“…14 One of these techniques is the gas-mixing, [15][16][17] where a gas of lower mass is injected into the plasma populated with the gas of heavier mass. The gas-mixing yields substantial improvement in the intensity of highly charged ions, and the ion-cooling model 18 is believed to work behind it. So far, there exists no empirical formula that can accurately provide the mass of a suitable mixing gas for the main plasma.…”

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confidence: 99%

Studies of pure and nitrogen gas mixed xenon ECR plasma: Signature of abundance dependent unusual trends in isotope anomaly

2022

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We report the effect of N 2 gas-mixing in the xenon electron cyclotron resonance (ECR) plasma, and abundance-dependent novel, exciting and unusual trends of the isotope anomaly. The xenon plasma was produced using a 10 GHz all-permanentmagnet NANOGAN ECR ion source, and the charge state distributions of naturally abundant six stable xenon isotopes with and without N 2 gas-mixing (at 25%, 50%, and 75%) were recorded. The intensity ratio of the heavier to lighter isotope, where the heavier isotope is less abundant, showed a clear signature of the isotope anomaly as explained by the linear Landau wave damping theory. Contrary to the theoretical prediction that the isotope anomaly should vanish with a relatively large fraction of the heavier isotope in mixed plasmas, the trends of intensity ratios observed in such cases are very unusual and have almost the mirror-symmetrical shapes of those trends recorded with less abundant heavier isotope. Further, the effect of relative mass difference on the isotope anomaly was also evidenced. The N 2 gas-mixing of the xenon plasma at 25% and 50% shifted the entire charge state distribution toward the higher intensity side owing to the supply of additional electrons that caused high ionization efficiency. However, a prominent gas-mixing effect was observed at 75% of N 2 mixing in the xenon plasma beyond the +7 charge state. The abundancedependent unusual trends in isotope anomaly have been explained by considering different ionic temperatures, ion heating by the wave damping, and Coulomb scattering in the core of the plasma.charge state distribution, electron cyclotron resonance (ECR) plasma, gas mixing effect, isotope anomaly, low energy accelerator, mass analyzer | INTRODUCTIONThe capability of producing multiply charged positive ions via the electron-impact ionization without using any cathode/filament made the electron cyclotron resonance ion sources (ECRIS) very popular among the accelerator physicists. [1][2][3][4][5][6][7] The intensities in ECRIS are mainly governed by the ion-confinement using the magnetic fields. In a typical structure, multipole permanent magnets are used for the radial confinement of the ions, whereas the axial confinement of the ions is achieved either by the permanent magnets or the electromagnets. 8,9 The fourth generation high-frequency ECRIS utilized superconducting magnetic coils for the axial confinement of the ions. [10][11][12] The resonant electrons, which have a gyration frequency equals to the frequency of the input electromagnetic wave, gain enough kinetic energy to ionize the gaseous atom/molecules and yield intense plasma. 13

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Modeling space-resolved ion dynamics in ECR plasmas for predicting in-plasma β-decay rates

et al. 2022

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Lifetimes of radioactive nuclei are known to be affected by the level configurations of their respective atomic shells. Immersing such isotopes in environments composed of energetic charged particles such as stellar plasmas can result in β-decay rates orders of magnitude different from those measured terrestrially. Accurate knowledge of the relation between plasma parameters and nuclear decay rates are essential for reducing uncertainties in present nucleosynthesis models, and this is precisely the aim of the PANDORA experiment. Currently, experimental evidence is available for fully stripped ions in storage rings alone, but the full effect of a charge state distribution (CSD) as exists in plasmas is only modeled theoretically. PANDORA aims to be the first to verify these models by measuring the β-decay rates of select isotopes embedded in electron cyclotron resonance (ECR) plasmas. For this purpose, it is necessary to consider the spatial inhomogeneity and anisotropy of plasma ion properties as well as the non-local thermodynamic equilibrium (NLTE) nature of the system. We present here a 3D ion dynamics model combining a quasi-stationary particle-in-cell (PIC) code to track the motion of macroparticles in a pre-simulated electron cloud while simultaneously using a Monte Carlo (MC) routine to check for relevant reactions describing the ion population kinetics. The simulation scheme is robust, comprehensive, makes few assumptions about the state of the plasma, and can be extended to include more detailed physics. We describe the first results on the 3D variation of CSD of ions both confined and lost from the ECR trap, as obtained from the application of the method to light nuclei. The work culminates in some perspectives and outlooks on code optimization, with a potential to be a powerful tool not only in the application of ECR plasmas but for fundamental studies of the device itself.

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Simulations of ECRIS performance for different working materials

Cited by 3 publications

References 13 publications

Spatial distributions of plasma potential and density in electron cyclotron resonance ion source

Spatial distributions of plasma potential and density in electron cyclotron resonance ion source

Studies of pure and nitrogen gas mixed xenon ECR plasma: Signature of abundance dependent unusual trends in isotope anomaly

Modeling space-resolved ion dynamics in ECR plasmas for predicting in-plasma β-decay rates

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