Observation of impurity ions during a plasma translation experiment in nested Penning traps

Okada, Toshikazu; Himura, Haruhiko; Yamada, Shohei; Nishio, S.; Sanpei, Akio

doi:10.1016/j.physleta.2022.128617

Cited by 3 publications

(3 citation statements)

References 37 publications

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“…3 (b)). [11]. These phenomena should be related to the short-time confinement of charged particles in the pair of outer wells of the nested trap.…”

Section: Resultsmentioning

confidence: 98%

“…The fractional charge neutralization f in this experiment is 0.002, where fractional charge neutralization f is defined as f = n i /n e [10]. To prevent generation of impurity ions, potential barriers are set to ϕ iu0 , ϕ id0 = 10 V and ϕ eu0 , ϕ ed0 = −10 V [11]. It should be noted that the ion skin depth λ i in the experiment is 5.1×10 3 m, which is relatively longer than plasma radii (∼ 1 cm) confined in the BX-U.…”

Section: Resultsmentioning

confidence: 99%

“…4 (b) and 5 (a), the confinement time of charged particles trapped in the outer well of the nested trap is shorter than 1 s. Charged particles are not thermalized in the outer well of the nested trap. Even high-energy electrons are produced, which generate impurity ions[11]. These phenomena should be related to the short-time confinement of charged particles in the pair of outer wells of the nested trap.…”

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confidence: 99%

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Confinement Experiments of Pure Ion and Electron Plasmas in a Nested Trap

OKADA,

HIMURA,

NAKAJIMA

et al. 2023

Plasma and Fusion Research

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We perform experiments where lithium ion and electron plasmas are simultaneously confined in a nested trap to detect two-fluid plasma states. However, the behavior of charged particles in the nested trap is unexplained.Results of experiments demonstrate that the number of charged particles in the outer wells of the nested trap rapidly decreases and that peculiar deformations in ion and electron plasmas cause in some conditions.

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“…3 (b)). [11]. These phenomena should be related to the short-time confinement of charged particles in the pair of outer wells of the nested trap.…”

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Confinement Experiments of Pure Ion and Electron Plasmas in a Nested Trap

OKADA,

HIMURA,

NAKAJIMA

et al. 2023

Plasma and Fusion Research

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Single-shot fast cinematic imaging during merging process of multiple electron filaments in electrostatic potential well

Okada,

Himura,

Nakajima

et al. 2024

Review of Scientific Instruments

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For the first time, details of the spatial and temporal acceptable evolution of the merging process of co-rotating electron vortices in a potential well are successfully captured using a “single-shot method” with a high temporal resolution of 10 µs. Four-electron filaments are trapped inside the Beam eXperiment-Upgrade linear trap [H. Himura, Nucl. Instrum. Methods Phys. Res. A 811, 100 (2016)] with a uniform axial magnetic field and co-axial multi-ring electrodes. Images of non-emitting electron filaments are captured using a high-speed camera with up to 1 000 000 fps, a microchannel plate, a fast-decay phosphor screen of which fluorescence duration is 0.15 µs, and a super fine metallic mesh with an open area ratio of 89%. Images captured every 10 µs clearly show the growth of multiple short-wave instabilities in the wing trailing electron vortices. The experimental methods and measurement techniques presented in this paper can contribute to revealing exactly how small vortices evolve into a large structure or turbulence in a potential well through complex processes.

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