Magnetic energy analyzer with a microchannel plate calibrated using cellulose nitrate film

Hirano, Koji; Yamamoto, Toshikazu; Okabe, Yushiro; Shimoda, Katsuji

doi:10.1063/1.1139560

Cited by 9 publications

(2 citation statements)

References 11 publications

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“…In the case of small to medium energy PF devices, with capacitor bank energy up to a few tens of kilojoules, beam target processes involving axially directed deuteron beams were found to account for the observed anisotropy and neutron yield [2,4,5]. Measurements of the energy distribution function of deuterons were obtained using TOF detectors Thomson analysers [2,3,6,[8][9][10][11][12]14]. The energy spectrum of the deuterons was found to be in the 0.02-10 MeV range, for PF devices of characteristic bank energy in the 5-200 kJ range.…”

Section: Discussionmentioning

confidence: 99%

Ion beam emission in a low energy plasma focus device operating with methane

Bhuyan¹,

Chuaqui²,

Favre³

et al. 2005

J. Phys. D: Appl. Phys.

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An investigation of ion beam emission from a low energy plasma focus (PF) device operating with methane is reported. Graphite collectors, operating in the bias ion collector mode, are used to estimate the energy spectrum and ion flux along the PF axis, using the time-of-flight technique. The ion beam signals are time correlated with the emission of soft x-ray pulses from the pinched focus plasma. The correlation of ion beam intensity with filling gas pressure indicates that the beam emission is maximized at the optimum pressure for focus formation at peak current. Ion beam energy correlations for operation in methane indicate that the dominant charge states in carbon ions are C+4 and C+5. The estimated maximum ion energy for H+, C+4 and C+5 are in the range of 200–400 keV, 400–600 keV and 900–1100 keV, respectively, whereas their densities are maximum for the energy range 60–100 keV, 150–250 keV and 350–450 keV, respectively. These results suggest that the ion beams are emitted from a high density, high temperature, short lived focus plasma, at a time which appears to precede the emission of soft x-ray pulses. The properties of the carbon ion beams are discussed in the context of potential applications in materials science.

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Section: Discussionmentioning

confidence: 99%

Ion beam emission in a low energy plasma focus device operating with methane

Bhuyan¹,

Chuaqui²,

Favre³

et al. 2005

J. Phys. D: Appl. Phys.

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“…1) The energy is sometimes more than one hundred times as large as the bank voltage. 2) The mechanism of the production of these ions has been investigated for several decades and various theories have been considered. 3,4) However, the physical mechanism of the production of these ions remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Ion Beams Produced in a Plasma Focus Device

Takao¹,

Doi²,

Hirata³

et al. 2001

Jpn. J. Appl. Phys.

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The characteristics of the ion beams produced in a plasma focus device were studied. In the experiment, a Mather-type plasma focus device was used which was prefilled with H 2 at 2.3 Torr. Ion species and their energy spectra were evaluated with a Thomson parabola spectrometer. The particle pinhole image was obtained with an aluminum filtered particle pinhole camera. The ion current density was measured with a biased ion collector. From the measurement, the proton beam energy was found to be distributed from 0.15 MeV to 2 MeV. The particle pinhole image of the proton beam with an energy of more than 1 MeV has spotlike patterns. The ion current density of 2400 A/cm 2 with a pulse width of 50 ns was observed on the axis at z = 260 mm from the top of the anode. The peak power brightness of the proton beams was evaluated to be 18 GW/cm 2 /sr/keV, and the total power brightness was evaluated to be 20 TW/cm 2 /sr.

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