Characteristics of Ion Beams Produced in a Plasma Focus Device

Takao, Kazuto; Doi, Yasuhiro; Hirata, Shuzo; Shiotani, M.; Kitamura, I.; Takahashi, T.; Masugata, Katsumi

doi:10.1143/jjap.40.1013

Cited by 31 publications

(20 citation statements)

References 7 publications

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“…[1][2][3] The mechanism leading to the generation of the high energy ion beam is believed to be closely corelated to phenomena that give rise to localised high electric field, such as the rapid compression during the radial pinch phase and instability. In fact, from the measurements of electron beam, 4) there is indication that localised high electric field may be induced by both these two phenomena.…”

Section: Introductionmentioning

confidence: 99%

Generation Of High Energy Ion Beams from a Plasma Focus Modified for Low Pressure Operation

Wong

Choi²,

Leong

et al. 2002

Jpn. J. Appl. Phys.

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This paper reports on the modification of a small plasma focus device (UNU/ICTP PFF) to operate at low pressure for enhanced ion beam generation. For the present operation, the electrode geometry of the plasma focus device is modified to redirect the plasma motion at the end of the axial rundown phase so that normal plasma focus action will not occur. The redirection of the plasma leads to a rapid increase in the plasma resistivity and hence a high localized electric field will be established and as a result, high energy ion beam will be generated. With air as the working gas, pressure as low as 10 À3 mbar has been tested. At such a low pressure, breakdown of the discharge must be initiated with the use of a set of twelve plasma injection cable guns. The modified plasma focus has been shown to be able to produce high energy ion beams of nitrogen, argon and hydrogen consistently.

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Section: Introductionmentioning

confidence: 99%

Generation Of High Energy Ion Beams from a Plasma Focus Modified for Low Pressure Operation

Wong

Choi²,

Leong

et al. 2002

Jpn. J. Appl. Phys.

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“…39 While studying the characteristics of the hydrogen ion beam, Takao et al observed that the energy spectrum of the proton is distributed from a value in between 150 keV and 2 MeV. 21 In this experiment, we could detect much lower energy ions ͑Ն10 keV͒ as compared to the previous reports. It is evident from Fig.…”

Section: -3mentioning

confidence: 57%

“…the characteristics of hydrogen ion beam emission from a PF device and they observed that the proton beam energy is distributed from 0.15 to 2 MeV. 21 The angular distributions of the ion beam emission from the PF device with different experimental conditions were also investigated to some extent. Kelly and Marquez 22 found, while investigating the ion emission from a 5 kJ PF device, that the measured ion number at 0°͑anode axis͒ direction is approximately twice of that at 90°direction.…”

Section: Introductionmentioning

confidence: 99%

Temporal and spatial study of neon ion emission from a plasma focus device

Bhuyan¹,

Neog²,

Mohanty³

et al. 2011

Physics of Plasmas

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The temporal and spatial characteristics of the neon ion beam emissions from a low energy plasma focus device have been studied by employing a multiple Faraday cup assembly and the CR-39 track detectors at different angular and axial positions. In addition, the operating gas pressures were also varied to study the temporal and spatial characteristics of the neon ion beam emissions. The Faraday cup analyses show that the ion flux strongly depends on the operating gas pressure as well as the angular positions. The estimated ion energy measurements at the aperture of the Faraday cup indicate that the plasma focus device is a source of polyenergetic ions ranging from approximately a few keV to a few hundreds of keV, irrespective of the angular positions. The exposed CR-39 detectors have shown the formation of multiple ion tracks with diameter ranging from 2 to 13 m. The populations of lower diameter tracks ͑2-6 m͒ are observed to be more at 0°and 10°angles. It is also noticed that the most populated track counts have shifted toward the higher diameter as the angular positions change from 0°to 70°. The present study enables us to predict a clear picture of ion flux and energy distribution inside the plasma focus chamber that will help to use the device for material irradiation application in a more controlled manner.

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“…However, the physical mechanism of the production of these ions remains unclear. These energetic ions are considered to play an important role in the production of the intense neutron flux in the plasma focus device when using deuterium gas [4]. In addition, these ions are anticipated for application as an intense pulsed ion source.…”

Section: Introductionmentioning

confidence: 99%

“…In general, SSNTDs seem to be particularly suitable for time-integrated experimental studies of different nuclear reaction products, such as 3 He and 4 He nuclei, protons, fast neutrons and heavy impurity ions. Fast neutrons can be detected with the polycarbonate CR-39 (C 12 H 18 O 7 ) through the tracks of recoil protons originating in the detector material itself, or in radiator foils such as polyethylene placed in front.…”

Section: Introductionmentioning

confidence: 99%