A compact neutron generator using a field ionization source

Persaud, A.; Waldmann, O.; Kapadia, Rehan; Takei, Kuniharu; Javey, Ali; Schenkel, T.

doi:10.1063/1.3672437

Cited by 19 publications

(13 citation statements)

References 9 publications

(1 reference statement)

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“…1 They are also used in ion sources, for example field ionization sources for neutron generators. [2][3][4][5][6] In all cases, it is important to be able to characterize the field emitter samples, which can be done using electron field emission experiments, see for example Ref. 7.…”

Section: Introductionmentioning

confidence: 99%

Analysis of slope-intercept plots for arrays of electron field emitters

Persaud

2013

Journal of Applied Physics

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In electron field emission experiments, a linear relationship in plots of slope vs. intercept obtained from Fowler-Nordheim analysis is commonly observed for single tips or tip arrays. By simulating samples with many tips, it is shown here that the observed linear relationship results from the distribution of input parameters, assuming a log-normal distribution for the radius of each tip. Typically, a shift from the lower-left to the upper-right of a slope-intercept plot has been correlated with a shift in work function. However, as shown in this paper, the same effect can result from a variation in the number of emitters

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Section: Introductionmentioning

confidence: 99%

Analysis of slope-intercept plots for arrays of electron field emitters

Persaud

2013

Journal of Applied Physics

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“…Compact, high current plasma discharge devices also enable parametric studies of materials relevant for our understanding of plasma-wall interactions in fusion reactors, complementing efforts conducted with large plasma devices [45]. This approach can further inform the development of very compact neutron sources that can replace radiological neutron sources for applications requiring relatively low neutron yields [46]. Table 1: Summary of errors and uncertainties affecting measured neutron yields, relative yields and the value of an electron screening potential, Ue.…”

Section: Discussionmentioning

confidence: 99%

Investigation of light ion fusion reactions with plasma discharges

Schenkel

Persaud

Wang

et al. 2019

Journal of Applied Physics

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The scaling of reaction yields in light ion fusion to low reaction energies is important for our understanding of stellar fuel chains and the development of future energy technologies. Experiments become progressively more challenging at lower reaction energies due to the exponential drop of fusion cross sections below the Coulomb barrier. We report on experiments where deuterium-deuterium (D-D) fusion reactions are studied in a pulsed plasma in the glow discharge regime using a benchtop apparatus. We model plasma conditions using particle-in-cell codes. Advantages of this approach are relatively high peak ion currents and current densities (0.1 to several A/cm 2 ) that can be applied to metal wire cathodes for several days. We detect neutrons from D-D reactions with scintillator-based detectors. For palladium targets, we find neutron yields as a function of cathode voltage that are over 100 times higher than yields expected for bare nuclei fusion at ion energies below 2 keV (center of mass frame). A possible explanation is a correction to the ion energy due to an electron screening potential of 1000±250 eV, which increases the probability for tunneling through the repulsive Coulomb barrier. Our compact, robust setup enables parametric studies of this effect at relatively low reaction energies.

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“…Various types of neutron generators have been made and tested at different groups [3]- [5]. A wide variety of applications ranging from medical and basic science to homeland security are in need of compact high-flux neutron generators, especially in neutron activation studies, detection of explosives, detection of special nuclear materials, neutron radiography, and chemical analysis [6]- [8].…”

Section: Introductionmentioning

confidence: 99%

Ion Beam Profile Diagnostic Methods for Vacuum Arc Ion Source in Sealed-Tube Neutron Generator

Zhi‐Jian

Long

Wang

et al. 2015

IEEE Trans. Plasma Sci.

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The pulsed ion beam from a vacuum arc source in a compact sealed-tube neutron generator owns many special features, such as multiparticle mixture beams, high-intensity beams, short pulsewidth beams, transporting in a single gap acceleration system, and eccentric beams. Beam profile and composition are useful information for designing a high-intensity sealed-tube neutron generator, especially for the insulation withstand of the device, the life of the tritium target, the neutron yield, and so on. An improved traditional online diagnostic method that uses an aluminum-coated scintillator screen and a novel offline diagnostic method that is based on secondary ion mass spectrometry are introduced, respectively. The preliminary experimental results can show the intensity distribution of the ion beam profile and the composition with high resolution. The results from the two methods can fit each other well.Index Terms-Beam profile, neutron generator, scintillator screen, secondary ion mass spectrometry (SIMS), vacuum arc ion source.

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A compact neutron generator using a field ionization source

Cited by 19 publications

References 9 publications

Analysis of slope-intercept plots for arrays of electron field emitters

Analysis of slope-intercept plots for arrays of electron field emitters

Investigation of light ion fusion reactions with plasma discharges

Ion Beam Profile Diagnostic Methods for Vacuum Arc Ion Source in Sealed-Tube Neutron Generator

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