Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where D. Keerthisinghe is active.

Publication


Featured researches published by D. Keerthisinghe.


Physica Scripta | 2013

Dependence of electron transmission on charge deposited in tapered glass macrocapillaries at a tilt angle of 5.0

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

Transmission and guiding of fast electrons through insulating PET nanocapillaries

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

Broadening in the energy distribution of electron beams transmitted through a micrometer-sized tapered glass capillary

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

Electron Transmission through Polycarbonate Nanocapillaries

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

Transmission of Fast Highly Charged Ions through a Single Glass Macrocapillary and Polycarbonate Nanocapillary Foils

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

Angular and time dependence of electron transmission through a macroscale tapered glass capillary

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

Electron transmission through a microsize tapered glass capillary

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

Charge deposition dependence and energy loss of electrons transmitted through insulating PET nanocapillaries

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

Angular dependence of electron transmission through a microsized tapered glass capillary

S.J. Wickramarachchi; T. Ikeda; D. Keerthisinghe; B.S. Dassanayake; J. A. Tanis


Physical Review A | 2015

Elastic and inelastic transmission of electrons through insulating polyethylene terephthalate nanocapillaries

D. Keerthisinghe; B.S. Dassanayake; S.J. Wickramarachchi; N. Stolterfoht; J. A. Tanis

Collaboration


Dive into the D. Keerthisinghe's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar

J. A. Tanis

Western Michigan University

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

A. Ayyad

Western Michigan University

View shared research outputs
Top Co-Authors

Avatar

N. Stolterfoht

Helmholtz-Zentrum Berlin

View shared research outputs
Top Co-Authors

Avatar

B S Dassanayake

Western Michigan University

View shared research outputs
Top Co-Authors

Avatar

J A Tanis

Western Michigan University

View shared research outputs
Top Co-Authors

Avatar

G G De Silva

Western Michigan University

View shared research outputs
Top Co-Authors

Avatar

G G DeSilva

Western Michigan University

View shared research outputs
Top Co-Authors

Avatar

N Kayani

Western Michigan University

View shared research outputs
Researchain Logo
Decentralizing Knowledge