D. Keerthisinghe
Western Michigan University
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Publication
Featured researches published by D. Keerthisinghe.
Physica Scripta | 2013
S.J. Wickramarachchi; B.S. Dassanayake; D. Keerthisinghe; T. Ikeda; J. A. Tanis
The characteristics of charge deposited (time) into a tapered glass capillary were studied for an incident energy of ? 1025?eV at a tilt angle of 5?. Electron beams resulting in intensities of 1.5?7000?nC deposited into a tapered borosilicate glass capillary were investigated for inlet/outlet diameters of 800/100??m. The electron transmission consisted of stable transmission, fluctuations, blocking and self-discharging associated with a sudden rise of?transmission as deposited charge was ejected from the capillary. In the case of stable transmission, it was found to be due to both elastic and inelastic contributions, with inelastic transmission dominant.
22nd International Conference on the Application of Accelerators in Research and Industry, CAARI 2012 | 2013
D. Keerthisinghe; B.S. Dassanayake; S.J. Wickramarachchi; A. Ayyad; N. Stolterfoht; J. A. Tanis
Transmission and guiding of electrons traveling through insulating PET nanocapillaries were measured for different sample tilt angles at the energies of 500 and 800 eV. Direct transmission and guiding and the transition between the two regions were observed for angles near zero degrees. Elastic and inelastic spectra and a combination of the two were seen in the different regions.
Journal of Physics: Conference Series | 2014
S.J. Wickramarachchi; T Ikeda; D. Keerthisinghe; B S Dassanayake; J. A. Tanis
The transmission of electrons through a tapered glass capillary was observed for 1000 eV incident electrons up to tilt angles of ~9.5°. Tilt angle dependence of the energy loss broadening shows clear correspondence of elastic and inelastic processes. Both were found for smaller tilt angles.
Journal of Physics: Conference Series | 2012
D. Keerthisinghe; B S Dassanayake; G G De Silva; A. Ayyad; J A Tanis
Transmission of electrons through a polycarbonate nanocapillary foil with diameter 200 nm and aspect ratio ~ 40 has been studied at energies 500 and 1000 eV. The direct transmission of electrons was observed for both energies while onset of guiding was observed for 500 eV. Time (charge) evolution measurements were also carried out at different sample tilt angles.
Journal of Physics: Conference Series | 2012
A. Ayyad; B S Dassanayake; D. Keerthisinghe; G G DeSilva; T Elkafrawy; N Kayani; J A Tanis
Transmission of 3 MeV protons and 16 MeV O5+ ions through a single glass macrocapillary and a polycarbonate nanocapillary foil has been investigated. Results show that 3 MeV protons transmit through the capillary and the foils with little or no energy loss, while 16 MeV O5+ ions show transmission through the capillary and the foil with energy losses that vary with the tilt angle, and there are also changes in the charge state.
Journal of Physics: Conference Series | 2012
G G De Silva; B S Dassanayake; D. Keerthisinghe; A. Ayyad; J A Tanis
The transmission of electrons through a tapered glass capillary was observed for 500, 800 and 1000 eV incident electrons up to about ~1?. No significant energy loss was found for the sample tilt angles investigated. The guiding ability of electrons was found to decrease with increasing energy. Time evolution measurements reveal unstable transmission through the capillary consistent with sudden bursts of elastic transmissions.
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 2011
S.J. Wickramarachchi; B.S. Dassanayake; D. Keerthisinghe; A. Ayyad; J A Tanis
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 2013
D. Keerthisinghe; B.S. Dassanayake; S.J. Wickramarachchi; N. Stolterfoht; J. A. Tanis
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 2013
S.J. Wickramarachchi; T. Ikeda; D. Keerthisinghe; B.S. Dassanayake; J. A. Tanis
Physical Review A | 2015
D. Keerthisinghe; B.S. Dassanayake; S.J. Wickramarachchi; N. Stolterfoht; J. A. Tanis