Search results for "Triplet lens"

showing 2 items of 2 documents

Characterisation of beam focus quality in biomedical nuclear microscopy: A Fourier optics approach

2009

Abstract The central peak widths of the 2D-autocorrelation function have been investigated as a Figure of Merit (FoM) of focus quality in nuclear microscopy using a quadrupole triplet lens system. The beam focus could be reliably characterised for direct scanning transmission ion microscopy (direct-STIM) images obtained with fluences as small as 5.8 × 10 9 ions cm - 2 which colocalisation tests showed did not introduce significant beam-induced changes in the cells.

Nuclear and High Energy PhysicsChemistrybusiness.industryFourier opticsScanning confocal electron microscopyTriplet lensIonOpticsQuadrupoleFigure of meritFocus (optics)businessInstrumentationBeam (structure)Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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A gas ionisation Direct-STIM detector for MeV ion microscopy

2015

Abstract 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–Muller 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 …

Nuclear and High Energy Physicsta114Physics::Instrumentation and Detectorsbusiness.industryChemistryResolution (electron density)DetectorTriplet lensMeV ion microscopeFocused ion beamionisation detectorOpticsIonizationRadiation damagedirect-STIMAtomic physicsbioimagingbusinessInstrumentationField ion microscopeReNcells VMDiodeNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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