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An ultra-thin diamond membrane as a transmission particle detector and vacuum window for external microbeams

Abstract : Several applications of external microbeam techniques demand a very accurate and controlled dose delivery. To satisfy these requirements when post-sample ion detection is not feasible, we constructed a transmission single-ion detector based on an ultra-thin diamond membrane. The negligible intrinsic noise provides an excellent signal-to-noise ratio and enables a hit-detection efficiency of close to 100%, even for energetic protons, while the small thickness of the membrane limits beam spreading. Moreover, because of the superb mechanical stiffness of diamond, this membrane can simultaneously serve as a vacuum window and allow the extraction of an ion microbeam into the atmosphere.
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V. Grilj, N. Skukan, M. Pomorski, W. Kada, N. Iwamoto, et al.. An ultra-thin diamond membrane as a transmission particle detector and vacuum window for external microbeams. Applied Physics Letters, American Institute of Physics, 2013, 103, pp.243106. ⟨10.1063/1.4833236⟩. ⟨cea-01792091⟩

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