Charge state distribution studies of pure and oxygen mixed krypton ECR plasma – signature of isotope anomaly and gas mixing effect

Kumar, Pravin; Mal, Kedar; Rodrigues, G.

doi:10.1002/jms.3842

Cited by 5 publications

(1 citation statement)

References 27 publications

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“…With these intensities, no isotope anomaly in the pure and mixed xenon plasma was seen. Later, the gas‐mixing effect and the isotope anomaly were studied in the pure and oxygen mixed krypton plasma by measuring the intensity of only four highly abundant isotopes, namely, 82 Kr (~11.58%), 83 Kr (~11.49%), 84 Kr (~57%), and 86 Kr (17.3%) (three isotopes have nearly equal abundances, which are far from that of the fourth one) 26 . The gas‐mixing effect was prominent in the krypton ECR plasma, whereas the trends in the isotope anomaly were very strange.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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Effect of gas mixing on Xe ion currents from an ECR ion source

et al. 2019

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Gas mixing technique has been used in order to increase the current of highly charged ions of Xe at the TIFR‐ECRIA. The He, N2, O2, Ne, and Ar are used as support gases, and their effect on output currents of Xe ions is studied. The effective ion charge and the total loss rate of ions are calculated from the measured currents. It is found that molecular gases, such as N2 and O2, exhibit better mixing effect in the enhancement of output of highly charged Xe ions. Furthermore, we describe this 14.5‐GHz ECR ion source mounted on a high voltage (400 kV) deck, with its four beamlines, as well as the control system for the remote operation.

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Gas mixing effect on Kr ion currents from an ECR ion source

Mandal

Tribedi

2019

Nuclear Instruments and Methods in Physics Research Section B:

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Charge state distribution studies of pure and oxygen mixed krypton ECR plasma – signature of isotope anomaly and gas mixing effect

Cited by 5 publications

References 27 publications

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

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

Effect of gas mixing on Xe ion currents from an ECR ion source

Gas mixing effect on Kr ion currents from an ECR ion source

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