Schematic of the experimental apparatus Incident energy and charge deposition dependences of electron transmission through a microsized tapered glass capillary S. J. Wickramarachchi1, T. Ikeda2, B. S. Dassanayake3, D. Keerthisinghe1, J. A. Tanis1 1 Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA 2 Atomic Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan 3 Department of Physics, Faculty of Science, University of Peradeniya, Sri Lanka Introduction The guiding of highly charged ions (HCIs) and electrons through insulating nanocapillary foils [1,2] and microsized glass capillaries has been investigated in recent years [3,4] Microsized tapered glass capillaries have attracted attention because of their high focusing ability [5] and ability to produce high density charged ion beams [6] Applications of tapered glass capillaries High resolution x-ray imaging [7] In-air PIXE analysis [8] Nuclear Reaction Analysis [9] Biological cell surgery [10] Incident electron energies of 500 and 1000 eV on a tapered Borosilicate glass capillary were studied The capillary had an inlet inner diameter of 800 µm and outlet diameter of 100 µm The sample was prepared by the RIKEN laboratory in Japan and the measurements were conducted at Western Michigan University Angular and charge deposition dependences of the transmitted intensities at 500 eV and 1000 eV were examined e gun = Tilt angle  = Azimuthal Angle θ = Observation angle Spectrometer For 500 eV, transmitted energy spectra have the energy width and centroid energy equal to those of incident beam, the transmission is elastic For 1000 eV, inelastic nature of the energy spectra is clearly seen with the green and blue peaks giving evidence by broader energy width compare to the elastic red peak Charge deposition dependence 500 eV (beam flux into capillary ~60 pA) Transmission gradually increased (charge up constants ~65 nC) Reaches relatively stable transmission with some oscillations Elastic behavior dominant 1000 eV (beam flux into capillary ~25 pA) Quicker charge up was observed (charge up constants ~ 3.5 nC) Periodic oscillations were observed For larger tilt angles stable transmission was observed Both elastic and inelastic transmission contribute References [1] N. Stolterfoht et al., Phys. Rev. A 88, 133201 (2002) [2] S. Das et al., Phys. Rev. A 76, 042716 (2007) [3] T. Ikeda et al., J. Phys. Conf. Ser. 399, 012007 (2012) [4] B. S. Dassanayake et al., Phys. Rev. A 81, 020701(R) (2010) [5] T. Nebiki et al., J. Vac. Sci. Technol. A 21, 1671 (2003) [6] D. Sekiba et al., Nucl. Instr. and Meth. B 266, 2125 (2008) [7] J. Hasegawa et al., Nucl. Instr. and Meth. B 266, 2125 (2008) [8] T. Nebiki et al., Nucl. Instrum. Meth. Phys. Res. B 249, 226 (2006) [9] D. Sekiba et al., Nucl. Instr. and Meth. B 266, 4027 (2008) [10] Iwai et al., App. Phys. Lett. 92, 023509 (2008) Three peak structure attributed to direct transmission and reflection from each wall Energy dependence shows elastic transmission (Coulomb deflection) for 500 eV and inelastic transmission for 1000 eV Charge dependence for 500 eV slowly increases for all angles investigated; for 1000 eV transmission almost immediately and oscillates for small angles and is nearly stable equilibrium for the larger angle. Conclusion Present Work Schematic of the experimental apparatus Electrons emitted from the e-gun were directed through the tapered glass capillary sample and analyzed by the spectrometer.  and θ are the tilt angle of the sample and observation angle, respectively Angular dependence 500 eV 1000 eV Energy dependence Angular distributions for 500 eV and 1000 eV incident electrons for tilt angle ψ and spectrometer angle θ as indicated Energy spectra for the maximum transmitted intensity positions indicated on angular spectra. Beam flux into capillary  5 –15 pA Electrons transmitted up to -6.5o for 500 eV and -9.50 for 1000 eV Beam intensity profiles had up to 3 peaks for both energies