Development and Improvement Status of Active X-Ray Generators for Future Lunar and Planetary Landing Observations

Nagaoka, Hiroshi; Okada, Tatsuaki; Kusano, Hiroki; Tanaka, Naomichi; Naito, Masayuki; Hasebe, Nobuyuki

doi:10.2322/tastj.19.193

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…This discrepancy by the CT-MT discharge may be induced by the asymmetric shape of target support and crystal, i.e., rectangle support and cylindrical crystal. Typical X-ray spectra, which were similar to our previous works 11,12 , were obtained by the supporting plates except for the size of 1 cm × 5 cm (Fig. 4(a) and (b)).…”

Section: Time Profiles and Energy Spectra Of X-ray Countssupporting

confidence: 77%

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Electric discharge relevant to pyroelectric spontaneous polarization inducing irreproducibility of pyroelectric x-ray generation

Naito

Kusano

Nagaoka

et al. 2022

Advances in X-Ray/Euv Optics and Components XVII

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The spontaneous polarization of pyroelectric crystal is utilized to X-ray emission in low pressure gas of ~1 Pa, which has a potential as a future in-situ X-ray source with small size, light weight, and low electric power consumption. The pyroelectric X-ray production still has problems as its intensity and reproducibility because the mechanism of electron production is still an open question. We have experimentally and numerically evaluated pyroelectric X-ray generation relevant to electric discharges around the pyroelectric crystal with various sizes of target support and target with/without a needle. Three kinds of electric discharge, between crystal top and metallic target (CT-MT discharge), between crystal top and crystal bottom (CT-CB discharge), and along with crystal surface (CS discharge), were observed. The CT-MT discharge was measured by the 1 cm × 5 cm target support or target with a needle, which induced irregular X-ray increases. X-ray intensity became reproducible, but not so large when the CT-MT discharges were measured. The CTCB and CS discharges were active for the large target plates. These two discharges occur irregularly, resulting low reproducibility. While reduction of crystal potential by the CS discharge was not large, the CT-CB discharge stopped Xray emission. When the CT-CB was not measured, the X-ray intensity became large. Calculation results of electric fields at around the crystal supported the experimental results, which implied that selection of appropriate target support is one of important factors to obtain large and reproducible X-ray intensity by the pyroelectric X-ray generation.

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Section: Time Profiles and Energy Spectra Of X-ray Countssupporting

confidence: 77%

“…Large X-ray counts were measured during the cooling phase, i.e., X-ray emission from the Cu target. This tendency was common in the previous studies 8, [10][11][12] . Some irregular increases and stops of X-ray counts appear in the 1 cm × 5 cm (Fig.…”

Section: Time Profiles and Energy Spectra Of X-ray Countssupporting

confidence: 65%

Electric discharge relevant to pyroelectric spontaneous polarization inducing irreproducibility of pyroelectric x-ray generation

Naito

Kusano

Nagaoka

et al. 2022

Advances in X-Ray/Euv Optics and Components XVII

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“…This type of source has already been used in energy dispersive X‐ray fluorescence instruments 9,10 . The use of PXG for planetary XRF instrument has been studied previously with focus on source development 11,12 . The present work uses a commercial source and is focused on the improvement of detector resolution, measurement reproducibility, and peak selection algorithm implementation.…”

Section: Introductionmentioning

confidence: 99%

Improvements of portable energy dispersive X‐ray fluorescence instrument: Resolution withSilicon Drift Detector, measurements stability using pyroelectric sources, and adaptation for space use

Carapelle¹,

Lejeune²,

Morelle

et al. 2022

X-Ray Spectrometry

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An energy dispersive X‐ray fluorescence instrument has been developed to be used for space exploration. In particular, the electronic readout has been redesigned to withstand the radiation environment of space and improve the energy resolution down to 121.17 eV using an Silicon Drift Detector (SDD). Besides, the instrument uses pyroelectric sources as excitation sources. We include a renormalization to reduce measurement fluctuation from 25.2% to 3.7%. A peak search algorithm has been implemented based on calibration to improve accuracy and reduce possible aging drift effects.

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Development and Improvement Status of Active X-Ray Generators for Future Lunar and Planetary Landing Observations

Cited by 2 publications

References 5 publications

Electric discharge relevant to pyroelectric spontaneous polarization inducing irreproducibility of pyroelectric x-ray generation

Electric discharge relevant to pyroelectric spontaneous polarization inducing irreproducibility of pyroelectric x-ray generation

Improvements of portable energy dispersive X‐ray fluorescence instrument: Resolution withSilicon Drift Detector, measurements stability using pyroelectric sources, and adaptation for space use

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