Effect of magnetic field distribution on ECR ion source discharge

Liu, Yu-Guo; Jiang, Ke; Zhao, Guangyi; Benchao, Lou; Hu, Yonghong; Liu, Rong

doi:10.1007/s41365-018-0464-3

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…Regardless of the variation in the magnetic field distribution, the plasma will eventually be concentrated in the center of the discharge chamber, with the maximum electron density near the discharge chamber proper and the minimum electron density at the walls. However, the distribution and concentration of the plasma are different, which is consistent with the results of the antenna source simulation [28]. The saddle-shaped magnetic field has a more vital magnetic field confinement force than the flat and Gaussian-distribution magnetic fields.…”

Section: Effects Of Three Classical Axial Magnetic Field Distribution...supporting

confidence: 83%

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Design of a Miniaturized Electron Cyclotron Resonance Ion Source for High-Voltage Proton Accelerator

Yu,

He,

Zhao

et al. 2023

Applied Sciences

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The Electron Cyclotron Resonance (ECR) ion source fulfills high-current, high-efficiency, and compactness requirements for high-voltage proton accelerators. It is a cathode-free source that uses microwaves to heat a magnetically confined plasma, so there is no cathode loss resulting in a short service life. We finished the design for a miniaturization ECR ion source system, including a microwave system and source body. The traditional microwave system’s scale, which is approximately 1 m, has been reduced to 0.234 m, and the transmission efficiency is greater than 90%. The influence of cavity size and magnetic field distribution on gas ionization is analyzed under the condition that the outer size of the permanent magnet ring is limited, and the optimal scheme of cavity size and saddle-shaped magnetic field distribution is obtained. This design meets the requirement of fitting the ion source system into the restricted space in the high-voltage accelerator’s head.

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Section: Effects Of Three Classical Axial Magnetic Field Distribution...supporting

confidence: 83%

“…Sci. 2023,13, x FOR PEER REVIEW 15 of 18 simulation[28]. The saddle-shaped magnetic field has a more vital magnetic field confinement force than the flat and Gaussian-distribution magnetic fields.…”

mentioning

confidence: 99%

Design of a Miniaturized Electron Cyclotron Resonance Ion Source for High-Voltage Proton Accelerator

Yu,

He,

Zhao

et al. 2023

Applied Sciences

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show abstract

“…X-(Extraordinary) mode. In the magnetic field configuration shown in figure 9, the magnetic field around the rod antenna is lower than that at the side wall of the chamber, forming a so-called low-field-side injection for the X-wave [34]. In this case, the injected X-wave will sequentially encounter, in the Clemmow-Mullaly-Allis diagram [35], the cutoff layer of right-hand polarized wave and the upper hybrid resonance (UHR) layer, before reaching the ECR layer.…”

Section: Exact Location Of Gas Breakdown In Ecr Layermentioning

confidence: 99%

On abnormal behaviors of ion beam extracted from electron cyclotron resonance ion thruster driven by rod antenna in cross magnetic field

Li¹,

Fu²,

Yang³

et al. 2021

Plasma Sci. Technol.

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In a 2.45 GHz electron cyclotron resonance (ECR) ion thruster powered with rod antenna under a cross magnetic field, abnormal behaviours such as sudden drop of ion beam current (I b) and larger increasing-rate of I b in the high microwave power (P w) discharges at high gas flow rates were observed. A differential method was proposed to reveal the changes in the radial profiles of gray values extracted from the end-view discharge images. The increasing-rate of I b with respect to P w was used to evaluate efficiencies of ion production and transport. Analyses indicate that discharges are dominantly sustained by ordinary wave via electron heating in the electron plasma resonance layer that can shift along the rod-antenna, and extraordinary wave can only ignite a discharge in the ECR layer in the low gas flow rate regime. In terms of the confinement region defined by the magnetic field lines intercepting with the screen grid, the confinement region of the optimized 2.45 GHz cross magnetic field takes the shape of hourglass, enabling the high increasing-rate of I b with respect to P w in high power discharges at high gas flow rates. Correlated with the accompanied bright boundary layer appearing in the differentiated image, the sudden drop of I b in the low gas flow rate regime is attributed to the discharge ignited by the enhanced extraordinary wave in the ECR layer neighbouring the narrowest confinement region, where the produced ions can promptly enter the loss region.

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“…The reaction processes of hydrogen plasma are complicated, the dominant production pathways of H + 1 , H + 2 and H + 3 are shown in table 1, and the reaction cross sections are mainly affected by the electron temperature in the plasma [12,13]. Ion source operating parameters would change the plasma density, electron temperature distribution, and the probability of electron-ion recombination on the wall, then affect the production of different ions [14].…”

Section: Jinst 15 T04005 3 Proton Fraction Measurementmentioning

confidence: 99%

Proton beam intensity and proton fraction measurement of the 2.45 GHz ECR ion source

Wei

Pan

et al. 2020

J. Inst.

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In this paper we report results of experimental studies of the dependence of the proton beam intensity and proton fraction of the 2.45 GHz electron cyclotron resonance (ECR) ion source on the operational parameters such as extraction voltage, microwave window, impedance matching, gas flow, microwave power, pipeline gas pressure, plasma chamber size, and magnetic field. The DC hydrogen ion beams are measured and analyzed on the bench of ion source and pre-analysis system of the Lanzhou university high intensity neutron generator ZF400. Our results show that a higher proton beam intensity and fraction can be obtained with a microwave window made up of 2 mm AlN. The proton beam intensity and fraction strongly depend on the three-stub tuner that controls the impedance matching between microwave and plasma. We also observe notable beam loss under the lower vacuum pressure condition. K: Ion sources (positive ions, negative ions, electron cyclotron resonance (ECR), electron beam (EBIS)

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Effect of magnetic field distribution on ECR ion source discharge

Cited by 8 publications

References 14 publications

Design of a Miniaturized Electron Cyclotron Resonance Ion Source for High-Voltage Proton Accelerator

Design of a Miniaturized Electron Cyclotron Resonance Ion Source for High-Voltage Proton Accelerator

On abnormal behaviors of ion beam extracted from electron cyclotron resonance ion thruster driven by rod antenna in cross magnetic field

Proton beam intensity and proton fraction measurement of the 2.45 GHz ECR ion source

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