Nuclear microprobe performance in high-current proton beam mode for micro-PIXE

作者: P. Vavpetič , M. Kelemen , B. Jenčič , P. Pelicon

DOI: 10.1016/J.NIMB.2017.01.023

关键词:

摘要: Abstract The performance of a nuclear microprobe is dominantly determined by the brightness injected ion beam. At Jožef Stefan Institute (JSI), negative hydrogen beams are created in multicusp source and into 2 MV tandetron accelerator. output characteristics were tuned order to obtain matching proton beam intensities for accelerator object slits as well. For optimal focusing high-current mode (I > 100 pA) sub-micrometer dimensions, dedicated thin nanostructures with sharp edges have been manufactured. Set was micromachined focused (FIB) at film reference material, produced Reference Materials Measurements (IRMM) constituted 57 μg/cm 2 titanium on vitreous carbon substrate. profiles measured scans across over long measuring times, indicating eventual slow drifts sample from direction. Overall, dimensions 600 nm obtained, demonstrating appropriate stability micro-PIXE (micro-Particle Induced X-ray Emission) resolution elemental analysis biological tissue samples prepared freeze-dried state or frozen-hydrated state. resulting required high current 3 MeV presented.

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