A gas ionisation Direct-STIM detector for MeV ion microscopy

Norarat, Rattanaporn (School of Engineering – HE-Arc Ingénierie, HES-SO // University of Applied Sciences Western Switzerland ; Rajamangala University of Technoloy Lanna, Chiang Rai, Thailand ; University of Jyväskylä, Jyväskylä, Finland) ; Guibert, Edouard (School of Engineering – HE-Arc Ingénierie, HES-SO // University of Applied Sciences Western Switzerland) ; Jeanneret, Patrick (School of Engineering – HE-Arc Ingénierie, HES-SO // University of Applied Sciences Western Switzerland) ; Dellea, Mario (School of Engineering – HE-Arc Ingénierie, HES-SO // University of Applied Sciences Western Switzerland) ; Jenni, Josef (School of Engineering – HE-Arc Ingénierie, HES-SO // University of Applied Sciences Western Switzerland) ; Roux, Adrien (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland) ; Stoppini, Luc (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland) ; Whitlow, Harry J. (School of Engineering – HE-Arc Ingénierie, HES-SO // University of Applied Sciences Western Switzerland)

Direct-Scanning Transmission Ion Microscopy (Direct-STIM) is a powerful technique that yields structural information in sub-cellular whole cell imaging. Usually, a Si p-i-n diode is used in Direct-STIM measurements as a detector. In order to overcome the detrimental effects of radiation damage which appears as a broadening in the energy resolution, we have developed a gas ionisation detector for use with a focused ion beam. The design is based on the ETH Frisch grid-less off-axis Geiger–Müller geometry. It is developed for use in a MeV ion microscope with a standard Oxford Microbeams triplet lens and scanning system. The design has a large available solid angle for other detectors (e.g. proton induced fluorescence). Here we report the performance for imaging ReNcells VM with μm resolution where energy resolutions of <24 keV fwhm could be achieved for 1 MeV protons using isobutane gas.


Keywords:
Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEPIA - Genève
HE-Arc Ingénierie
Institute:
inSTI - Institut des Sciences et Technologies industrielles
Date:
2015-04
Published in:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Numeration (vol. no.):
2015, vol. 348, pp. 58-61
DOI:
ISSN:
0168-583X
Appears in Collection:

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 Record created 2021-03-19, last modified 2021-03-22

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