• B.S. in Physics, University of Rochester, Rochester, New York, USA
• M.S. in Physics, Lehigh University, Bethlehem, Pennsylvania, USA
• Ph.D. in Physics, Lehigh University, Bethlehem, Pennsylvania, USA

• Outstanding Research Award, 2007, Thammasat University.
• Outstanding Dissertation Award, 2005, National Research Council of Thailand (NRCT).
• Development and Promotion of Science and Technology Talents Project (DPST) Scholarship, 1990-2004.

Nuclear fission, Nuclear fusion, Thermal and particle transport, Magneto hydrodynamic instability, Plasma-surface interactions, Plasma fuelling system, Neutron and radiation sources.

Plasma Physics and Nuclear Fusion

This work aims to study plasma behaviors and nuclear fusion reactions that occur inside a device called a “Tokamak”. The research focuses on various topics including thermal and particle transports, plasma instability, plasma-wall interactions, and plasma heating. The results can contribute in simulating the time evolution of temperature and density profiles in tokamaks. This research contributes in an essential way to the interpretation and planning of experiments, validation of theory against experimental results, development of plasma control techniques, and the design of next step devices such as ITER.

• 2004-Present: SIIT
• 2000-2004: Research Assistant, Physics Department, Lehigh University, Bethlehem, Pennsylvania, USA
• 1998-1999: Lab Instructor and Teaching Assistant, Physics Department, Lehigh University, Bethlehem, Pennsylvania, USA

• Chatthong B and Onjun T, “Simulations of ITER in the presence of ITB using the NTV intrinsic toroidal rotation model”, Nuclear Fusion, (2013); 53: (1), Paper No. 013007, 11 p.
• Klaywittaphat P and Onjun T, “Scaling of the density peak with pellet injection in ITER”, Plasma Science and Technology, (2012); 14: (12) 1035.
• Pianroj Y and Onjun T, “Simulation of H-mode plasma in tokamak using a complete core-edge modeling in the BALDUR code”, Plasma Science and Technology, (2012); 14: (9) 778
• Klaywittaphat P and Onjun T, “Simulations of plasma behavior during pellet injection in ITER”, Plasma Physics Reports, (2012); 38: (6) 496
• Pianroj Y, Techakunchaiyanunt J; and Onjun T, “Model for pedestal transport based on suppression of anomalous transport using ω_E×B flow shear and magnetic shear”, Journal of the Physical Society of Japan, (2012); 81: (6), Paper No. 044502, 13 p.
• Pianroj Y and Onjun T, “Projection of bootstrap current in the ITER with standard type I ELMy H-mode and steady state scenarios”, Songklanakarin Journal of Science and Technology, (2012); 34: (1) 77
• Leekhaphan P and Onjun T, “Pellet injection into h-mode ITER plasma with the presence of internal transport barriers”, Plasma Physics Reports, (2011); 37: (4) 321
• Wisitsorasak A and Onjun T, “Impacts of pellets injected from the low-field side on plasma in ITER”, Plasma Physics Reports, (2011); 37: (1) 1
• Chatthong B and Onjun T, “Self-consistent simulations of standard h-mode ITER with the presence of an internal transport barrier”, Thammasat International Journal of Science and Technology, (2011); 16: (1), 42
• Buangam W, Onjun T, Suwanna S, and Singhsomroje W, “New models for predicting pedestal temperature and density in ELMy h-mode plasma”, Thammasat International Journal of Science and Technology, (2011); 16: (1), 54
• Pianroj Y, Suwanna S, and Onjun T, “Performance analysis of low-power tokamak reactors using predictive integrated modeling code”, Thammasat International Journal of Science and Technology, (2011); 16: (1), 66
• Klaywittaphat P, Onjun T, Kessaratikoon P, and Picha R, “Study of NGS pellet ablation rate in ITER based on two different pellet ablation rate models using 1.5D BALDUR code”, Thammasat International Journal of Science and Technology, (2010); 15: (4), 49
• Pianroj Y, Chuchinda C, Leekhaphan P, Onjun T, “Bahaviors of impurity in ITER plasma with standard type I ELMy h-mode and steady-state scenarios”, Plasma Physics Reports, (2010); 36: (10) 827
• Chatthong B, Onjun T and Singhsomroje W, “Model for toroidal velocity in H-mode plasmas in the presence of internal transport barriers”, Nuclear Fusion (2010); 50: (6)
• Siriwitpreecha A and Onjun T, “Development of density and temperature boundary condition models in L-mode tokamak plasmas”, Thammasat International Journal of Science and Technology, (2010); 15: (3), 19
• Leekhaphan P and Onjun T, “Impurity transport and helium accumulation in ITER”, Thammasat International Journal of Science and Technology, (2010); 15: (3), 47
• Poolyarat N, Onjun T and Promping J, “Simulation study of HL-2A-like plasma using integrated predictive modeling code”, Plasma Physics Reports (2009); 35: (11) 987 (Published in Russian in Fizika Plazmy (2009) 35: (11) 1066).
• Onjun T, “ITER performance study with the presence of internal transport barrier”, Journal of Plasma and Fusion Research Series (2009); 8: 347
• Onjun T and Pianroj Y, “Simulations of ITER with combined effects of internal and edge transport barriers”, Nuclear Fusion (2009); 49: 7
• Onjun T, “The effects of ErxB flow shear profile on the formation of internal transport barrier in ITER”, Thammasat International Journal of Science and Technology, (2009); 14: (3) 14
• Onjun T, “Improving h-mode pedestal temperature scalings with second ballooning stability”, Thammasat International Journal of Science and Technology, (2009); 14: (2) 42
• Onjun T, Siriburanon T, and Onjun O, “A pedestal temperature model with self-consistent calculation of safety factor and magnetic shear,” J. Phys.: Conf. Ser. 123 012013 (2008)
• Onjun T, Tharasrisuthi K, and Onjun O, “Projected performance of international thermonuclear experimental reactor Tokamak based on different pedestal width scalings” J. Phys.: Conf. Ser. 123 012034 (2008)
• Onjun T, “Predictions of ion and electron pedestal temperatures in ITER” Thammasat International Journal of Science and Technology (2008); 13: 33
• Promping J, Onjun T, and Poolyarat N, “The study of thermal transport in the HL-2A plasma experiment with ECRH,” KMITL Science Journal (2008); 8: (2) 79
• Tharasrisuthi K, Onjun T, and Onjun O, “Projections of ITER performance based on different pedestal width scalings”, Thammasat International Journal of Science and Technology (2008); 13: 45
• Siriburanon T, Onjun T, and Onjun O, “Development of new theoretical-based pedestal temperature model”, Thammasat International Journal of Science and Technology (2008); 13: 55
• Lonnroth J-S, Bateman G, Becoulet M, Beyer P, Corrigan G, Figarella C, Fundamenski W, Garcia O E, Garbet X, Huysmans G, Janeschitz G, Johnson T, Kiviniemi T, Kuhn S, Kritz A, Loarte A, Naulin V, Nave F, Onjun T, Pacher GW, Pacher HD, Pankin A, Parail V, PittsR, Saibene G, Snyder P, Spence J, Tskhakaya D, and Wilson H, “Integrated ELM modelling”, Contrib. Plasma Phys. (2006); 46 (7-9) 726-738
• Bateman G, Kritz AH, Pankin AY, Onjun T, McElhenny J E, and MacDonald C, “Simulatnios of pedestal formation and ELM cycles”, Plasma Physics and Controlled Fusion (2006); 48: A93
• Onjun T, “Pedestal temperature models based on first and second stability limits of ballooning modes”, Laser and Particle Beams (2006); 24: 113
• Pankin A Y, Bateman G, Brennan D P, Schnack D D, Snyder P B, Voitsekhovitch I, Kritz A H, Janeschitz G, Kruger S, Onjun T, Pacher G W, and Pacher H D. “Theory-based model for the pedestal, edge stability and ELMs in tokamaks,” Nuclear Fusion (2006); 46: 403
• Snyder S, Kritz A, Bateman G, Onjun T, and Parail V. “Effect of isotope mass on simulations of the high-mode pedestal and edge localized modes”, Physics of Plasmas (2005); 12: 112508
• Onjun T, Kritz A, Bateman G, and Parail V. “Magnetohydrodynamic-calibrated edge-localized mode model in simulations of International Thermonuclear Experimental Reactor”, Physics of Plasmas (2005); 12: 082513
• Pankin A Y, Bateman G, Brennan D P, Schnack D D, Snyder P B, Voitsekhovitch I, Kritz A H, Kruger S, Janeschitz G, Onjun T, Pacher G W, and Pacher H D. “ELM triggering conditions for the integrated modeling of H-mode plasmas”, Czechoslovak Journal of Physics (2005); 55: 367
• Pankin A Y,Voitsekhovitch I, Bateman G, Dnestrovski A, Janeschitz G, Murakami M, Osborne T, Kritz A H, Onjun T, Pacher G W, and Pacher H D. “Combined model for the H-mode pedestal and ELMs”, Plasma Physics and Controlled Fusion (2005); 47: 483
• Onjun T, Kritz A, Bateman G, Parail V, Wilson H, and Dnestrovskij A, “Interplay between ballooning and peeling modes in simulations of the time evolution of edge localized modes”, Physics of Plasmas (2005); 12: 012506
• Kritz AH, Bateman G, Kinsey J, Pankin A, Onjun T, Redd A, McCune D, Ludescher C, Pletzer A, Andre R, Zakharov L, Lodestro L, Pearlstein LD, Jong R, Houlberg W, Strand P, Wiley J, Valanju P, John HS, Waltz R, Mandrekas J, Mau TK, Carlsson J, and Braams B, “The National Transport Code Collaboration module library”, Computer Physics Communications (2004); 164; 108
• Onjun T, Kritz A, Bateman G, Parail V, Lonnroth J, and Huysmans G, “Integrated pedestal and core modeling of Joint European Torus JET triangularity scan discharges”, Physics of Plasmas (2004); 11: 3006
• Onjun T, Kritz A, Bateman G, Parail V, Wilson H, Lonnroth J, Huysmans G, and Dnestrovskij A, “Stability analysis of H-mode pedestal and edge localized modes in a Joint European Torus power scan”, Physics of Plasmas (2004); 11: 1469
• Paméla J, Emilia R. S, and JET EFDA Contributors “Overview of JET results”, Nuclear Fusion (2003); 43, 1540
• Kinsey J, Bateman G, Onjun T, Kritz A, Pankin A, Staebler G, and Waltz R, “Burning plasma projections using drift-wave transport models and scalings for the H-mode pedestal”, Nuclear Fusion (2003); 43: 1845
• Bateman G, Bandres M, Onjun T, Kritz A, and Pankin A, “Integrated predictive modeling of high-mode tokamak plasmas using a combination of core and pedestal models”, Physics of Plasmas (2003); 10: 4358
• Bateman G, Onjun T, and Kritz A, “Integrated predictive modelling simulations of burning plasma experiment designs”, Plasma Physics and Controlled Fusion (2003); 45: 1939
• Parail V, Bateman G, Becoulet M, Corrigan G, Heading D, Hogan J, Houlberg W, Huysmans G, Kinsey J, Korotkov A, Kritz A, Loarte A, Lonnroth J, McDonald D, Monier-Garbet P, Onjun T, Saibene G, Sartori R, Sharapov S, and Wilson H, “Integrated Predictive Modeling of JET H-mode Plasma with Type-I and Type-III ELMs”, Plasma Physics Reports (2003); 29: 539
• Mukhovatov V, Shimomura Y, Polevoi A, Shimada M, Sugihara M, Bateman G, Cordey J, Kardaun O, Pereverzev G, Voitsekhovich I, Weiland J, Zolotukhin O, Chudnovskiy A, Kritz A, Kukushkin A, Onjun T, Pankin A, and Perkins F, “Comparison of ITER performance predicted by semi-empirical and theory-Based Transport Models”, Nuclear Fusion (2003); 43: 942
• Onjun T, Bateman G, Kritz A, and Hammett G, “Models for the Pedestal Temperature at the Edge of H-mode Tokamak Plasmas”, Physics of Plasmas (2002); 9: 5018
• Onjun T, Bateman G, Kritz A, and Hannum D, “Comparison of low confinement mode transport simulations using the mixed Bohm/gyro-Bohm and Multi-mode-95 transport models,” Physics of Plasmas (2001); 8: 975
• Hannum D, Bateman G, Kinsey J, Kritz A, Onjun T, and Pankin A, “Comparison of high-mode predictive simulation using Mixed Bohm/gyro-Bohm and Multi mode(MMM95) transport models,” Physics of Plasmas (2001); 8: 965
• Staebler G, Waltz R, Kinsey J, Bateman G, Kritz A, Onjun T, Pankin A, Zhu P, and Horton W, “Drift wave based modeling of poloidal spin-up precursor and stepwise expansion of transport barriers,” Nuclear Fusion (2001); 41: 891

International Conferences:

• Klaywittaphat P and Onjun T, “Pellets trigger L to H-mode transitions in ITER”, in Proceedings of 2012 International Symposium on Technology for Sustainability (ISTS 2012) [CD-ROM], 21-24 November 2012, Bangkok, Thailand.
• Chatthong B, Onjun T, Picha R, and Poolyarat N, “Analytical study of L-H transition and transition criteria using bifurcation concept”, in Proceedings of 2012 International Symposium on Technology for Sustainability (ISTS 2012) [CD-ROM], 21-24 November 2012, Bangkok, Thailand.
• Tamman A, Nisoa M, and Onjun T, “Preliminary study of dust particle behaviors in magnetic field”, in Proceedings of 2012 International Symposium on Technology for Sustainability (ISTS 2012) [CD-ROM], 21-24 November 2012, Bangkok, Thailand.
• Chatthong B, Onjun T; Picha R and Poolyarat N, “Impact of toroidal flow on ITB H-mode plasma performance in fusion tokamak”, in Proceedings of the Second TSME International Conference on Mechanical Engineering [CD-ROM], 19-21 October, 2011, Krabi, Thailand.
• Pianroj Y, Adulsiriswad P, and Onjun T, “Preliminary testing of integrated simulation for L-mode tokamak plasma from consistent core-edge-SOL with BALDUR code”, in Proceedings of the Second TSME International Conference on Mechanical Engineering [CD-ROM], 19-21 October, 2011, Krabi, Thailand.
• Jomphoak A, Maturos T, Pogfay T, Karuwan C, Tuantranont A, and Onjun T., “Enhancement of thermal conductivity with Al2O3 for nanofluids”, in Proceedings of the First TSME International Conference on Mechanical Engineering (TSME-ICoME 2010), 20-22 October 2010, Ubon Ratchathani, Thailand.
• Siriwitpreecha A, Onjun T, Suwanna S, Picha R, and Poolyarat N, “Development of dynamic boundary density model in H-mode scenarios”, in Proceedings of the First TSME International Conference on Mechanical Engineering (TSME-ICoME 2010), 20-22 October 2010, Ubon Ratchathani, Thailand.
• Chatthong, B, Onjun T, Singhsomroje W, Poolyarat N, Suwanna S, and Picha R, “Simulations of ITB H-mode tokamak plasmas with predictive toroidal velocity model”, in Proceedings of the First TSME International Conference on Mechanical Engineering (TSME-ICoME 2010), 20-22 October 2010, Ubon Ratchathani, Thailand.
• Klaywittaphat P, Onjun T, Picha R, Poolyarat N, and Suwanna S, “Simulation of ITER plasma during pellet injection”, in Proceedings of the First TSME International Conference on Mechanical Engineering (TSME-ICoME 2010), 20-22 October 2010, Ubon Ratchathani, Thailand.
• Pianroj Y, Fukuyama A, Onjun T, Suwanna S, Poolyarat N, and Picha R, “Preliminary results of core-edge simulations of H-mode tokamak plasmas using BALDUR and TASK codes”, in Proceedings of the First TSME International Conference on Mechanical Engineering (TSME-ICoME 2010), 20-22 October 2010, Ubon Ratchathani, Thailand.
• Chuchinda C, Onjun T, Picha R, Klaywittaphat P, Poolyarat N, and Suwanna S, “Impurity behaviours in ITER plasmas with standard type I ELMy H-mode before and after heating phase”, in Proceedings of the 37th European Physical Society Conference on Plasma Physics (EPS 2010), 21-25 June 2010, Dublin, Ireland.
• Chatthong B, Onjun T, Picha R, Poolyarat N, Singhsomroje W, and Suwanna S, “Comparison of toroidal velocity models using integrated predictive modeling code in ITB H-mode plasma”, in Proceedings of the 37th European Physical Society Conference on Plasma Physics (EPS 2010), 21-25 June 2010, Dublin, Ireland.
• Siriwitpreecha A, Onjun T, Suwanna S, Picha R, and Poolyarat N, “Development of dynamic boundary density models with hydrogenic and impurity densities in H-mode scenarios”, in Proceedings of the 37th European Physical Society Conference on Plasma Physics (EPS 2010), 21-25 June 2010, Dublin, Ireland.
• Klaywittaphat P, Onjun T, Kessaratikoon P, Picha R, Poolyarat N, and Suwanna S, “Simulations of ITER plasma during pellet injection”, in Proceedings of the 37th European Physical Society Conference on Plasma Physics (EPS 2010), 21-25 June 2010, Dublin, Ireland.
• Onjun T, et al., “ITER Simulations with Internal and Edge Transport Barriers,” in Proc. 22nd IAEA Fusion Energy Conf., 13-18 October 2008, Geneva, Switzerland
• S. Suwanna, Onjun T, et al., “Pedestal Temperature Models with Self-Consistent Calculation of Safety Factor and Magnetic Shear,” in Proc. 22nd IAEA Fusion Energy Conf., 13-18 October 2008, Geneva, Switzerland
• R. Picha, Onjun T, et al., “Study of ITER Performance Based on Different Plasma Geometry,” in Proc. 22nd IAEA Fusion Energy Conf., 13-18 October 2008, Geneva, Switzerland
• S. Suwanna, T. Onjun, et al., “The Development of Pedestal Temperature Model with Self-Consistent Calculation of Safety Factor and Magnetic Shear,” in Proc. 35th EPS Conference on Plasma Phys. 9-13 June 2008, Hersonissos, Greece, (ECA Vol.32, P-4.015)
• N. Poolyarat, T. Onjun, et al., “The Study of Transport in ISTTOK and HL-2A Using Integrated Predictive Modeling Code,” in Proc. 35th EPS Conference on Plasma Phys. 9-13 June 2008, Hersonissos, Greece, (ECA Vol.32, P- 4.030)
• R. Picha, T. Onjun, et al., “Dependence of ITER Performance on Pedestal Temperature, Average Electron Density, Auxiliary Heating Power, and Impurity Content,” in Proc. 35th EPS Conference on Plasma Phys. 9-13 June 2008, Hersonissos, Greece, (ECA Vol.32, P-4.040)
• Onjun T, et al., “Investigation of Nuclear Fusion Performance in ITER Based on Mixed Bohm/gyro-Bohm and Multi-Mode Transport Models,” in Proc. International Conference on Engineering, Applied Sciences, and Technology, 21-23 November 2007, Bangkok, Thailand
• Onjun T, et al., “Self-Consistent Prediction of ITER Using Mixed Bohm/gyro-Bohm and Multi-Mode Core Transport Models,” in Proc. 5th IAEA Technical Meeting on “Steady State Operation of Magnetic Fusion Devices”, 14-17 May 2007, Daejeon, Republic of Korea
• Onjun T, et al., “Second Ballooning Stability Effect on H-mode Pedestal Scalings,” in Proc. 21st IAEA Fusion Energy Conf., 16-21 October 2006, Chengdu, China
• Jeenanunta C, …, and Onjun T, “Integrated Large-Scale Urban Simulation System for The Bangkok Metropolitan Area”, in Proc. International Conference on Simulation and Modeling, 17-19 January 2005, Bangkok, Thailand (2005)
• Guzdar P N, … Onjun T, et al., “Theory and theory-based models for the pedestal, edge stability and ELMs in tokamaks”, in Proc. 20th IAEA Fusion Energy Conf., 1-6 November 2004, Vilamoura, Portugal (2004)
• Onjun T, et al., “MHD-calibrated ELM model in simulations of ITER”, in Proc. 12th International Congress on Plasma Physics, 25-29 October 2004, Nice, France (2004)
• Pankin A Y, …, Onjun T, et al., “ELM triggering conditions for the integrated modeling of H-mode plasmas”, in Proc. 12th International Congress on Plasma Physics, 25-29 October 2004, Nice, France (2004)
• Bateman G,…, Onjun T, et al., “Issues concerning the simulation of the H-mode pedestal and ELMs in tokamaks”, in Proc. 31st European Physical Society Conference on Plasma Physics, 28-2 July 2004, London, England (2004)
• Kritz AH, Onjun T, et al., “Investigation of Instabilities that Trigger ELMs in JET Discharges”, in Proc. 30st European Physical Society Conference on Controlled Fusion and Plasma Physics, 7-11 July 2003, St. Petersburg, Russia (2003)
• Onjun T, et al., “Models for H-mode Pedestal Temperature and Predictions for Future Tokamak Designs”, in Proc. 11th International Congress on Plasma Physics, 15-19 July 2002, Sydney, Australia (2002)
• Kritz AH,…, Onjun T, et al., “Testing H-mode Pedestal and Core Transport Models Using Predictive Integrated Modeling Simulations,” in Proc. 29th EPS Conf. on Controlled Fusion and Plasma Physics, 17-21 June 2002, Montreux, Switzerland (2002)
• Parail V,…, Onjun T, et al., “Integrated Predictive Modelling of JET H-mode Plasma with Type-I ELMs,” in Proc. 19th IAEA Fusion Energy Conf., 14-19 October 2002, Lyon, France (2002)
• Osborne T H,…, Onjun T, et al., “Characteristics of the H-mode Pedestal and Extrapolation to ITER,” in Proc. 19th IAEA Fusion Energy Conf., 14-19 October 2002, Lyon, France (2002)
• Mukhovatov V,…, Onjun T, et al., “Comparison of ITER performance predicted by empirical, semi-empirical and theory-based transport models,” in Proc. 19th IAEA Fusion Energy Conf., 14-19 October 2002, Lyon, France (2002)
• Kinsey J E,…, Onjun T, et al., “Burning plasma projections using drift-wave transport models and scalings for the H-mode pedestal,” in Proc. 19th IAEA Fusion Energy Conf., 14-19 October 2002, Lyon, France (2002)