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Due to covid 19 pandemic: virtual meetings only.
Research Interest
Research Interest
During my involvement in research as a graduate student, a postdoctoral scientist, and a visiting assistant professor, I have detected many types of particles and photons using a wide range of detectors, such as multi-channel plates, Faraday cups, PMTs, Charge-Coupled Devices (CCDs), calorimeters, photocathodes, and radiation detectors. In my quest to detect different particle/photons, I have realized that numerous projects can be set up in the undergraduate environment. Our surrounding provides boundless opportunities for us to interact with energetic particles and photons. The knowledge of particle/photon detection techniques not only opens new doors to accelerator/particle physics but also other areas of interest such as plasma physics, medical physics, condensed matter, security, remote sensing, etc.
Research Positions/ Experience
Research Positions/ Experience
Dr. Michael Schulz (Right) with his graduate students: Thusitha Arthanayaka (Front left) and Sachin Sharma (Back left).
Graduate Research Assistant
Graduate Research Assistant
Throughout my Ph.D. research (2010-2016), I have studied projectile coherent effects in the ionization of molecular Hydrogen (H2) and Helium (He) by proton impact. The studies were carried out at the Atomic, Molecular, and Optical (AMO) laboratory at Missouri S&T under the supervision of Dr. Michael Schulz.
Visitor
Visitor
During my brief visit at Fisher's lab at Missouri S&T (1 month - Jan 2019), I have learnt the application of ultra-cold atomic physics and laser cooling techniques to investigate the ionization dynamics of Lithium-6. There, I gained hands on experience in femto-second laser system, few-cycle pulse TiSa oscillator, mode locking techniques, and 2D/3D MOT techniques.
Dr. Daniel Fisher in front of his laser setup.
Savin's Group, Columbia University, in front of Navis Labs: Thusitha third from right.
Postdoctoral Scientist
Postdoctoral Scientist
After the completion of my doctoral studies, I have joined Department of Astrophysics at Columbia University, NYC as a Postdoctoral Research Scientist (Jan 2017- Dec 2018), where I was responsible for leading a series of experiments motivated by solar physics observations. The measurements were carried out at Lawrence Livermore Laboratories, CA.
Visiting Scientist
Visiting Scientist
At Electron Beam Ion Trap (EBIT) facility located at the Lawrence Livermore National Laboratory, I performed spectroscopic measurements to determine the electron densities (Feb 2017 - Dec 2018). Using EBIT, I have measured the Iron (Fe) M-shell spectral lines in the Extreme Ultra-Violet (EUV) regime to benchmark the electron densities. These results can be directly applicable to solar spectroscopy, and can also be used to test theoretical calculations. Further, these measurements will improve the scientific return of current and planned solar missions.
Thusitha Arthanayaka (Right) with his EBIT collaborators: Dr. Peter Beiersdorfer(Middle) and Dr. Gregory Brown (Left)
RESEARCH AWARDS AND HONORS
1. Dissertation Completion Fellowship, Missouri University of Science and Technology, May 2015.
2. Invited Talk: "Fully differential study of projectile coherence effects in atomic fragmentation processes", APS 68th Annual Gaseous Electron conference, Honolulu, HI, Oct 2015.
2. “Projectile Coherence Effects in Simple Atomic Systems”, M. Schulz, A. Hasan, B. Lamichhane, T. Arthanayaka, M. Dhital, and S. Bastola; J. Phys.: Conf. Ser. 1412 062007 (2020)
3. "Measurements of the effective electron density in an electron beam ion trap using extreme ultraviolet spectra and optical imaging", T. Arthanayaka, P. Beiersdorfer, G. Brown, M. Hahn, N. Hell, T.E. Lockard, and D. Savin, RSI, 89 (10), E119 (2018)
4. "Experimental comparison of spherically bent HAPG and Ge crystals", N. Hell, T.E. Lockard, P. Beiersdorfer, E. Magee, G. Brown, R. Shepherd, and T. Arthanayaka, RSI 89 (10), F21 (2018)
5. “Fully differential study of dissociative single capture and Coulomb explosion through double capture in p + H2 collisions”, B. R. Lamichhane, A. Hasan, T. Arthanayaka, M. Dhital, K. Koirala, T. Voss, R. A. Lomsadze, and M. Schulz, Phys. Rev. A, 96 (4), 042708 (2017)
6. “Fully Differential Study of Capture with Vibrational Dissociation in p+ H 2 Collisions”, B. Lamichhane, T. Arthanayaka, J. Remolina, A. Hasan, M. Ciappina, F. Navarrete, R. Barrachina, R. Lomsadze, M. Schulz, Phys. Rev. Lett. 119, 083402 (2017).
7. “Fully differential study of projectile coherence effects in ionization of molecular hydrogen and atomic helium", T. Arthanayaka, Doctoral Dissertations. 2506. (2016).
8. “Fully Differential Study of Wave Packet Scattering in Ionization of Helium by Proton Impact”, T. Arthanayaka, B.R. Lamichhane, A. Hasan, S. Gurung, J. Remolina, S. Borbély, F. Járai-Szabó, L. Nagy, and M. Schulz, J. Phys. B 49, 13LT02 (2016)
9. "Fully Differential Study of Ionization in p + H2 Collisions near Electron – Projectile Velocity Matching", A. Hasan, T. Arthanayaka, B. Lamichhane, S. Sharma, S. Gurung, J. Remolina, S. Akula, D. Madison, M. Ciappina, R. Rivarola and M. Schulz, J. Phys. B 49, 04LT01 (2016).
10. “Influence of the post-collision interaction on interference effects in ionization of H2 by proton impact”, TP Arthanayaka, S Sharma, BR Lamichhane, A Hasan, J. Remolina, S. Gurung and M. Schulz, J. Phys. B 48, 175204 (2015).
11. “Separation of Single- and Two-Center Interference Effects in Ionization of H2 by Proton Impact”, T. P. Arthanayaka, S. Sharma, B. R. Lamichhane, A. Hasan, J. Remolina, S. Gurung and M. Schulz, J. Phys. B 48 071001 (2015).
12. “Fully Differential Study of Interference Effects in the Ionization of H2 by Proton Impact ”, S. Sharma, T. P. Arthanayaka, A. Hasan, B. R. Lamichhane, J. Remolina, A. Smith and M. Schulz, Phys. Rev. A 90, 052710 (2014).
13. “Triple Differential Study of Ionization of H2 by Proton Impact for Varying Electron Ejection Geometries”, A. Hasan, S. Sharma, T. P. Arthanayaka, B. R. Lamichhane, J. Remolina, S. Akula, D. H. Madison and M. Schulz, J. Phys. B 47 215201 (2014).
14. “Complete Momentum Balance in Ionization of H2 by 75 keV Proton Impact for Varying Projectile Coherence”, S. Sharma, T. P. Arthanayaka, A. Hasan, B. R. Lamichhane, J. Remolina, A. Smith and M. Schulz, Phys. Rev. A 89, 052703 (2014).
15. “Projectile Coherence Effects in Electron Capture by Proton Colliding with H2 and He”, S. Sharma, A. Hasan, K. N. Egodapitiya, T. P. Arthanayaka, G. Sakhelashvili, and M. Schulz, Phys. Rev. A 86, 022706 (2012).
2. " Initial state and polarization dependence of multi-photon ionization of Li*", N. DeSilva, B. Acharya, K. Romans, T. Arthanayaka, K. Compton, K. Foster, S. Sharma, D. Fischer, APS meeting, 27-31 May 2019, Milwaukee, Wisconsin (2019).
3. "Measurements of the effective electron density in an electron beam ion trap using extreme ultraviolet spectra and optical imaging", T. Arthanayaka, P. Beiersdorfer, G. Brown, M. Hahn, N. Hell, T.E. Lockard, and D. Savin, HTPD meeting, 15-19 April 2018, San Diego (2018).
4. "Lawrence Livermore National Laboratory's EBIT-I Electron Beam Ion Trap: A host facility for interns", G. Brown, T. Arthanayaka, P. Beiersdorfer, N. Hell, T. Lockard, E. Magee, 2017 Annual Meeting of the Far West Section, November 3-4, 2017, Merced, California (2017)
5. “Density Diagnostics for Solar Physics Using an Electron Beam Ion Trap”, T.P. Arthanayaka, P. Beiersdorfer, G.V. Brown, M. Hahn, and D.W. Savin, 2017 Annual Meeting of the Far West Section, November 3-4, 2017, Merced, California (2017)
6. “Fully Differential Study of Capture with Vibrational Dissociation in p + H2 Collisions”, B. Lamichhane, T. Arthanayaka, J. Remolina, A Hasan, M. Ciappina, F. Navarrete, R. Barrachina, R. Lomsadze, M. Schulz, 70th Annual Gaseous Electronics Conference, November 6–10, 2017, Pittsburgh, Pennsylvania (2017)
7. “Understanding Solar Coronal Heating through Atomic and Plasma Physics Experiments”, D. W. Savin, T. Arthanayaka, P. Beiersdorfer, G. V. Brown, W. Gekelman, M. Hahn, S. Vincena, American Astronomical Society, 230 AAS Meeting, 4-8 June 2017, Austin, Texas (2017).
8. “Fully differential study on projectile coherence effects in ionization of helium by protons”, S. Sharma, T. Arthanayaka, B. Lamichhane, A. Hasan, S. Borbély, F. Járai-Szabó, L Nagy, 48th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics, June 5–9, 2017; Sacramento, California (2017).
9. “Experimental and theoretical fully differential study of coherence effects in ionization of He by proton impact”, M. Schulz, T. Arthanayaka, B. Lamichhane, A. Hasan, S. Gurung, J. Remolina, S. Borbely, F. Jarai-Szabo, L. Nagy, 69th Annual Gaseous Electronics Conference, October 10–14, 2016; Bochum, Germany (2016).
10. “Single- and two-center interference effects in fully differential cross sections for dissociative capture in 75 keV p + H2 collisions”, M. Schulz, B. Lamichhane, T. Arthanayaka, A. Hasan, J. Remolina, S. Li, 69th Annual Gaseous Electronics Conference, October 10–14, 2016; Bochum, Germany (2016).
11. ‘’Fully Differential Study of Projectile Coherence Effects in Atomic Fragmentation Processes”, T Arthanayaka, B Lamichhane, A Hasan, S Sharma, S. Gurung J. Remolina and M. Schulz, 68th Annual Gaseous Electronic Conference, Oct 12 – Oct 16, 2015, Honolulu, Hawaii (2015).
12. “Fully Differential Study of Projectile Coherence Effects in Ionization of H2”, T Arthanayaka, S Sharma, B Lamichhane, A Hasan, J. Remolina, A. Smith and M. Schulz, 67th Annual Gaseous Electronic Conference Vol 59, No. 8, Nov 2 – Nov 7, 2014, Raleigh, North Carolina (2014).
13. “Interference in Recoil-Ion Momentum Spectra for Ionization in p + H2 Collisions”, S. Sharma, A. Hasan, T. Arthanayaka, B. Lamichhane, J. Remolina, A. Smith and M. Schulz, 66th Annual Gaseous Electronic Conference Vol 58, No. 8, Sep 30 – Oct 4, 2013, Princeton, New Jersey (2013).
14. “Projectile Coherence Effects in Single and Dissociative Electron Capture in Collision of Protons with H2 and He”, S. Sharma, A. Hasan, K. Egodapitiya, T. Arthanayaka, G. Sakhelashvili, and M. Schulz, 65th Annual Gaseous Electronic Conference Vol 57, No. 8, Oct 22-26, 2012, Austin, Texas (2012).
Undergraduate Projects
Undergraduate Projects
Current undergraduate Projects
- Variable Casting/Superheating and its on Macro-sagregation of steel products .
Studies carried out at Evraz Pueblo (Steel fabricator in Pueblo, Colorado) laboratory.
Student: Jarad Ausbun, CSU-pueblo, Fall 2019
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