Plasma Physics Laboratory Forrestal Campus, C-Site, Room L222 Princeton University PO Box 451, Princeton, NJ 08543 Tel: (609) 243-2162 Email: hji@pppl.gov		Department of Astrophysical Sciences Peyton Hall, Room 106 Princeton University 4 Ivy Lane, Princeton, NJ 08544 Tel: (609) 258-1014 Email: hji@princeton.edu
	Hantao Ji

News: On Sunday March 4th, 2018 at 8:13pm in the Jadwin Hall high bay of Princeton University, we have successfully achieved first plasma on FLARE (Facility for Laboratory Reconnection Experiments), concluding 4 years of the construction activity. Here is a short news story.

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Major Teaching Activities

• Current Course in AY2015-2019: AST552 (General Plasma Physics II: Magnetohydrodynamics) Click here for the course website

• Previous Course in AY2013-2015: AST555 (Fusion Plasmas and Plasma Diagnostics) 

• Previous Course in AY2006-2013: AST552 (General Plasma Physics II, Part I Magnetohydrodynamics)
  

Major Research Activities

• Study of angular momentum transport including Magnetorotational Instability (MRI) in experimental devices at PPPL. Selected publications:
  • D. Hung, E. Blackman, K. Caspary, E. Gilson, and H. Ji, "Experimental Confirmation of the Standard Magnetorotational Instability Mechanism with a Spring-Mass Analogue", submitted (2018). (arXiv:1801.03569v2)
  • K. Caspary, D. Choi, F. Ebrahimi, E. Gilson, J. Goodman, and H. Ji, "Effects of axial boundary conductivity on a free Stewartson-Shercliff layer", Phys. Rev. E 97, 063110 (2018). (pdf)
  • X. Wei, H. Ji, J. Goodman, F. Ebrahimi, E. Gilson, F. Jenko, and K. Lackner, "Numerical simulations of the Princeton magnetorotational instability experiment with conducting axial boundaries", Phys. Rev. E 94, 063107 (2016). (pdf)
    
  • E. Edlund and H. Ji, “Reynolds number scaling of the influence of boundary layers on the global behavior of laboratory quasi-Keplerian flows”, Phys. Rev. E 92, 043005 (2015). (pdf)
    
  • E. Edlund and H. Ji, “Nonlinear stability of laboratory quasi-Keplerian flows”, Phys. Rev. E 89, 021004 (2014). (pdf)
    
  • H. Ji and S. Balbus, “Angular Momentum Transport in Astrophysics and in the Lab”, Physics Today 66, 27 (2013). (pdf)
    
  • C. Gissinger, J. Goodman, and H. Ji, "The role of boundaries in the magnetorotational instability", Phys. Fluids 24, 074109 (2012). (pdf)
    
  • E. Schartman, H. Ji, M. Burin, and J. Goodman, "Stability of quasi-Keplerian shear flow in a laboratory experiment", Astron. Astrophys. 543, A94 (2012). (pdf)
  • E. Spence, A. Roach, E. Edlund, P. Sloboda, and H. Ji, "Free magnetohydrodynamic shear layers in the presence of rotation and magnetic field", Phys. Plasmas 19, 056502 (2012). (pdf)
    
  • A. Roach, E. Spence, C. Gissinger, E. Edlund, P. Sloboda, J. Goodman and H. Ji, "Observation of a Free-Shercliff-Layer Instability in Cylinderical Geometry", Phys. Rev. Lett. 108, 154502 (2012). (pdf)
  • C. Gissinger, H. Ji, and J. Goodman, "Instabilities in magnetized spherical Couette flow", Phys. Rev. E 84, 026308 (2011). (pdf)
  • M. Nornberg, H. Ji, E. Schartman, A. Roach, and J. Goodman, "Observation of Magnetocoriolis Waves in a Liquid Metal Taylor Couette Experiment", Phys. Rev. Lett. 104, 074501 (2010). (pdf)
  • M. Burin, E. Schartman and H. Ji, "Local measurements of turbulent angular momentum transport in circular Couette flow", Exp. Fluids 48, 763 (2010). (pdf)
  • E. Schartman, H. Ji and M. Burin, "Development of a Couette–Taylor flow device with active minimization of secondary circulation ", Rev. Sci. Instrum. 80, 024501 (2009). (pdf)
  • H. Ji, P. Kronberg, S. Prager, and D. Uzdensky, "Mini-conference on angular momentum transport in laboratory and nature", Phys. Plasmas 15, 058302 (2008). (pdf)
  • W. Liu, J. Goodman, and H. Ji, "Traveling waves in magnetized Taylor-Couette flow", Phys. Rev. E 76, 016310 (2007). (pdf)
  • W. Liu, J. Goodman, I. Herron, and H. Ji, "Helical magnetorotational instability in magnetized Taylor-Couette flow", Phys. Rev. E 74, 056302 (2006). (pdf)
  • H. Ji, M. Burin, E. Schartman, and J. Goodman, "Hydrodynamic turbulence cannot transport angular momentum effectively in astrophysical disks", Nature 444, 343 (2006). (pdf, introduction by S. Balbus)
  • W. Liu, J. Goodman, and H. Ji, "Simulation of Magnetorotational Instability in a Magnetized Couette Flow", Astrophys. J. 643, 306 (2006). (pdf)
  • M. Burin, E. Schartman, H. Ji, R. Cutler, P. Heitzenroeder,  W. Liu, L. Morris, and S. Raftopolous, "Reduction of Ekman Circulation within Circular Couette Flow", Exp. Fluids 40, 962 (2006). (pdf)
  • A. Kageyama, H. Ji, J. Goodman, F. Chen, and E. Shoshan, "Numerical and Experimental Investigation of Circulation in Short Cylinders", J. Phys. Soc. Jpn. 73, 2434 (2004). (Abstract) (pdf file)
  • J. Goodman and H. Ji, "Magnetorotational Instability of Dissipative Couette Flow", J. Fluid Mech. 462, 365 (2002). (Abstract) (pdf file)
  • H. Ji, J. Goodman, and A. Kageyama, "Magnetorotational Instability in a Rotating Liquid Metal Annulus", Monthly Notices of Royal Astronomical Society 325, L1 (2001). (Abstract) (pdf file)

• Study of magnetic reconnection, especially in the Magnetic Reconnection Experiment (MRX) and Facility for Laboratory Reconnection Experiments (FLARE) at PPPL. Selected publications:
  
  • J. Yoo, J. Jara-Almonte, E. Yerger, S. Wang, T. Qian, A. Le, H. Ji, M. Yamada, W. Fox, E.-H. Kim, L.-J. Chen, and D. Gershman, "Whistler Wave Generation by Anisotropic Tail Electrons During Asymmetric Magnetic Reconnection in Space and Laboratory", Geophys. Res. Lett. 45, 8054 (2018). (pdf)
  • J. Jing, C. Liu, J. Lee, H. Ji, N. Liu, Y. Xu, and H. Wang, "Statistical Analysis of Torus and Kink Instabilities in Solar Eruptions", Astrophys. J. 864, 138 (2018). (pdf)
  • A. von Stechow, W. Fox, J. Jara-Almonte, J. Yoo, H. Ji, and M. Yamada, "Electromagnetic fluctuations during guide field reconnection in a laboratory plasma", Phys. Plasmas 25, 052120 (2018). (pdf)
  • J. Yoo, B. Na, J. Jara-Almonte, M. Yamada, H. Ji, V. Roytershteyn, M. Argall, W. Fox, and L.-J. Chen, "Electron heating and energy inventory during asymmetric reconnection in a laboratory plasma", J. Geophys. Res. 122, 9264 (2017). (pdf)
  • W. Fox, F. Sciortino, A. von Stechow, J. Jara-Almonte, J. Yoo, H. Ji, and M. Yamada, "Experimental Verification of the Role of Electron Pressure in Fast Magnetic Reconnection with a Guide Field", Phys. Rev. Lett. 118, 125002 (2017). (pdf)
  • C. Myers, M. Yamada, H. Ji, J. Yoo, J. Jara-Almonte, and W. Fox, "Quasi-static and dynamic magnetic tension forces in arched, line-tied magnetic flux ropes", Plasma Phys. Control. Fusion 59, 014048 (2016). (pdf)
  • C. Myers, M. Yamada, H. Ji, J. Yoo, J. Jara-Almonte, and W. Fox, "Laboratory study of low-b forces in arched, line-tied magnetic flux ropes", Phys. Plasmas 23, 112102 (2016). (pdf)
  • J. Jara-Almonte, H. Ji, M. Yamada, J. Yoo, and W. Fox, "Laboratory Observation of Resistive Electron Tearing in a Two-Fluid, Reconnecting Current Sheet", Phys. Rev. Lett. 117, 095001 (2016). (pdf) (click here for a news story)
  • C. Myers, M. Yamada, H. Ji, J. Yoo, W. Fox, J. Jara-Almonte, A. Savcheva, and E. DeLuca, "A dynamic magnetic tension force as the cause of failed solar eruptions", Nature 528, 526 (2015). (pdf)
  • Y. Chen, K. Fujimoto, C. Xiao, and H. Ji, "Plasma waves around separatrix in collisionless magnetic reconnection with weak guide field", J. Geophys. Res. 120, 6309 (2015) (pdf).
  • M. Yamada, J. Yoo, J. Jara-Almonte, W. Daughton, H. Ji, R. Kulsrud, and C. Myers, "Study of energy conversion and partitioning in the magnetic reconnection layer of a laboratory plasma", Phys. Plasmas 22, 056501 (2015). (pdf)
  • H. Ji and E. Zweibel, "Understanding Particle Acceleration in Astrophysical Plasmas", Science 347, 944 (2015). (pdf)
    
  • M. Yamada, J. Yoo, J. Jara-Almonte, H. Ji, R. Kulsrud, C. Myers, "Conversion of magnetic energy in the magnetic reconnection layer of a laboratory plasma", Nature Communications 5, 4774 (2014). (pdf)
    
  • J. Yoo, M. Yamada, H. Ji, J. Jara-Almonte, C. Myers, L.-J. Chen, "Laboratory study of magnetic reconnection with a density asymmetry across the current sheet", Phys. Rev. Lett. 113, 095002 (2014). (pdf)
  • J. Yoo, M. Yamada, H. Ji, J. Jara-Almonte, C. Myers, "Bulk ion acceleration and particle heating during magnetic reconnection in a laboratory plasma", Phys. Plasmas 21, 055706 (2014). (pdf)
  • J. Jara-Almonte, W. Daughton, and H. Ji, "Debye scale turbulence within the electron diffusion layer during magnetic reconnection", Phys. Plasmas 21, 032114 (2014). (pdf)
    
  • S. Dorfman, H. Ji, M. Yamada, J. Yoo, E. Lawrence, C. Myers, and T. Tharp, “Experimental observation of 3-D, implusive reconnection events in a Laboratory Plasma”, Phys. Plasmas 21, 012109 (2014). (pdf)
    
  • N. Jain, J. Buechner, S. Dorfman, H. Ji and A. Sharma, “Current disruption and its spreading in collisionless magnetic reconnection”, Phys. Plasmas 20, 112101 (2013). (pdf)
    
  • J. Yoo, M. Yamada, H. Ji, and C. Myers, “Observation of ion acceleration and heating during collisionless magnetic reconnection in a laboratory plasma”, Phys. Rev. Lett. 110, 215007 (2013). (pdf)
    
  • T.D. Tharp, M. Yamada, H. Ji, E. Lawrence, S. Dorfman, C. Myers, Y.-M. Huang, A. Bhattacharjee, “Study of the Effects of Guide Field on Hall Reconnection”, Phys. Plasmas 20, 055705 (2013). (pdf)
    
  • V. Roytershteyn, S. Dorfman, W. Daughton, H. Ji, M. Yamada, and H. Karimabadi, “Electromagnetic instability of thin reconnection layers: comparison of 3D simulations with MRX observations”, Phys. Plasmas 20, 061212 (2013). (pdf)
    
  • S. Dorfman, H. Ji, M. Yamada, J. Yoo, T. Tharp, E. Lawrence, and C. Myers, “Three-dimensional, Impulsive Magnetic Reconnection in a Laboratory Plasma”, Geophys. Phys. Lett. 40, 233 (2013). (pdf)
    
  • E. Lawrence, H. Ji, M. Yamada, and J. Yoo, “Laboratory Study of Hall Reconnection in Partially Ionized Plasmas”, Phys. Rev. Lett. 110, 015001 (2013). (pdf)
    
  • T. Tharp, M. Yamada, H. Ji, E. Lawrence, S. Dorfman, C. Myers, and J. Yoo, “Quantitative Study of Guide Field Effects on Hall Reconnection in a Laboratory Plasma”, Phys. Rev. Lett. 109, 165002 (2012) (pdf)
    
  • H. Ji and W. Daughton, "Phase diagram for magnetic reconnection in heliophysical, astrophysical, and laboratory plasmas," Phys. Plasmas 18, 111207 (2011) (pdf)
  • E. Zweibel, E. Lawrence, J. Yoo, H. Ji, M. Yamada, and L. Malyshkin, "Magnetic reconnection in partially ionized plasmas", Phys. Plasmas 18, 111211 (2011) (pdf)
  • E. Oz, C. Myers, M. Yamada, H. Ji, R. Kulsrud, and J. Xie, "Experimental verification of the Kruskal-Shafranov stability limit in line-tied partial-toroidal plasmas", Phys. Plasmas 18, 102107 (2011) (pdf)
  • V. Roytershteyn, W. Daughton, S. Dorfman, Y. Ren, H. Ji, M. Yamada, H. Karimabadi, L. Yin, B.J. Albright, and K.J. Bowers, "Driven magnetic reconnection near the Dreicer limit", Physics of Plasmas 17, 055706 (2010). (pdf)
  • M. Yamada, R. Kulsrud, and H. Ji, "Magnetic Reconnection", Reviews of Modern Physics 82, 603 (2010). (pdf)
  • Y. Wang, R. Kulsrud, and H. Ji, "An analytic study of the perpendicularly propagating electromagnetic drift instabilities in the Magnetic Reconnection Experiment", Physics of Plasmas 15, 122105 (2008). (pdf)
  • S. Dorfman, W. Daughton, V. Roytershteyn, H. Ji, Y. Ren, M. Yamada, "Two-dimensional fully kinetic simulations of driven magnetic reconnection with boundary conditions relevant to the Magnetic Reconnection Experiment", Physics of Plasmas 15, 102107 (2008). (pdf)
  • Y. Ren, M. Yamada, H. Ji, S. Dorfman, S. Gerhardt, R. Kulsrud, "Experimental study of the Hall effect and electron diffusion region during magnetic reconnection in a laboratory plasma", Physics of Plasmas 15, 082113 (2008). (pdf)
  • Y. Ren, M. Yamada, H, Ji, S. Gerhardt, R. Kulsrud, "Identification of the electron-diffusion region during magnetic reconnection in a laboratory plasma", Physical Review Letters 101, 085003 (2008). (pdf)
  • H. Ji, Y. Ren, M. Yamada, S. Dorfman, W. Daughton, S. Gerhardt, "New insights into dissipation in the electron layer during magnetic reconnection", Geophysical Research Letters 35, L13106 (2008). (pdf)
  • A. Kuritsyn, H. Ji, S. Gerhardt, Y. Ren, M. Yamada, "Effects of global boundary and local collisionality on magnetic reconnection in a laboratory plasma", Geophysical Research Letters 34, L16106 (2007). (pdf)
  • M. Inomoto, S. Gerhardt, M. Yamada, H. Ji, E. Belova, A. Kuritsyn, and Y. Ren, "Coupling between Global Geometry and the Local Hall Effect Leading to Reconnection-Layer Symmetry Breaking", Physical Review Letters 97, 135002 (2006). (pdf)
  • M. Yamada, Y. Ren, H. Ji, J. Breslau, S. Gerhardt, R. Kulsrud, and A. Kuritsyn, "Experimental study of two-fluid effects on magnetic reconnection in a laboratory plasma with variable collisionality", Physics of Plasmas 13, 052119 (2006). (pdf)
  • A. Kuritsyn, M. Yamada, S. Gerhardt, H. Ji, R. Kulsrud, and Y. Ren, "Measurements of the parallel and transverse Spitzer resistivities during collisional magnetic reconnection", Physics of Plasmas 13, 055703 (2006). (pdf)
  • Y. Ren, M. Yamada, S. Gerhardt, H. Ji, R. Kulsrud, and A.Kuritsyn, "Experimental Verification of the Hall Effect during Magnetic Reconnection in a Laboratory Plasma", Phys. Rev. Lett. 95, 055003 (2005). (Abstract) (pdf)
  • R. Kulsrud, H. Ji, W. Fox, and M. Yamada, "An electromagnetic drift instability in the magnetic reconnection experiment and its importance for magnetic reconnection", Phys. Plasmas 12, 082301 (2005). (Abstract) (pdf)
  • H. Ji, R. Kulsrud, W. Fox, and M. Yamada, "An obliquely propagating electromagnetic drift instability in the lower hybrid frequency range", J. Geophys. Res. 110, A08212 (2005). (Abstract) (pdf)
  • H. Ji, S. Terry, M. Yamada, R. Kulsrud, A. Kuritsyn, and Y. Ren, "Electromagnetic Fluctuations during Fast Reconnection in a Laboratory Plasma", Phys. Rev. Lett. 92, 115001(2004). (Abstract) (pdf)
  • F. Trintchouk, M. Yamada, H. Ji, R. M. Kulsrud, and T. A. Carter "Measurement of the transverse Spitzer resistivity during collisional magnetic reconnection", Phys. Plasmas 10, 319(2003). (Abstract) (pdf)
  • T. Carter, M. Yamada, H. Ji, R. Kulsrud, and F. Trintchouk "Experimental study of lower-hybrid drift turbulence in a reconnecting current sheet", Phys. Plasmas 9, 3272(2002). (Abstract) (pdf)
  • T. Carter, H. Ji, F. Trintchouk, M. Yamada, and R. Kulsrud, "Measurement of Lower-Hybrid Drift Turbulence in a Reconnecting Current Sheet", Phys. Rev. Lett. 88, 015001(2002). (Abstract) (pdf)
  • Hantao Ji, Troy Carter, Scott Hsu, and Masaaki Yamada, "Study of Local Reconnection Physics in a Laboratory Plasma", Earth Planets Space 53, 539(2001). (Abstract) (pdf)
  • S. Hsu, T. Carter, G. Fiksel, H. Ji, R. Kulsrud, and M. Yamada "Experimental Study of Ion Heating and Acceleration during Magnetic Reconnection", Phys. Plasmas 8, 1916(2001). (Abstract) (pdf)
  • S. Hsu, G. Fiksel, T. Carter, H. Ji, R. Kulsrud, and M. Yamada, "Local Measurement of Nonclassical Ion Heating during Magnetic Reconnection", Phys. Rev. Lett. 84, 3859(2000). (Abstract) (pdf)
  • M. Yamada, H. Ji et al., "Experimental investigation of the neutral sheet profile during magnetic reconnection", Phys. Plasmas 7, 1781(2000). (Abstract) (pdf)
  • H. Ji, "Helicity, Reconnection, and Dynamo Effects", AGU monograph "Magnetic Helicity in Space and Laboratory Plasmas", p.167 (1999). (Abstract) (pdf)
  • H. Ji, M. Yamada et al., "Magnetic Reconnection with Sweet-Parker Characteristics in Two-dimensional Laboratory Plasmas", Phys. Plasmas 6, 1743(1999). (Abstract) (pdf)
  • T.-H. Watanabe, T. Hayashi, T. Sato, M. Yamada, and H. Ji, "Modeling of magnetic island formation in magnetic reconnection experiment", Phys. Plasmas 6, 1253 (1999) (pdf)
  • H. Ji, M. Yamada et al., "Experimental Test of the Sweet-Parker Model of Magnetic Reconnection", Phys. Rev. Lett. 80, 3256(1998). (Abstract) (pdf)
  • M. Yamada, H. Ji et al., "Identification of Y-Shaped and O-Shaped Diffusion Regions during Magnetic Reconnection in a Laboratory Plasma", Phys. Rev. Lett. 78, 3117(1997). (Abstract) (pdf)
  • M. Yamada, H. Ji et al., "Study of Driven Magnetic Reconnection in a Laboratory Plasma", Phys. Plasmas 4, 1936(1997). (Abstract) (pdf)
  
  
• Study of magnetic field effects in high-energy-density (HED) laser plasmas, including magnetic reconnection. Selected publications:
• K. Huang, Q. Lu, L. Gao, H. Ji, X. Wang, and F. Fan, "Particle-in-cell simulations of magnetically driven reconnection using laser-powered capacitor coils", Phys. Plasmas 25, 052104 (2018). (pdf)
• G. Fiksel, W. Fox, L. Gao, and H. Ji, "A simple model for estimating a magnetic field in laser-driven coils", Appl. Phys. Lett. 109, 134103 (2016). (pdf)
• L. Gao, H. Ji, G. Fiksel, W. Fox, M. Evans, and N. Alfonso, "Ultrafast Proton Radiography of the Magnetic Fields Generated by Laser-Driven Coil Currents", Phys. Plasmas 23, 043106 (2016). (pdf)

• Study of plasma-facing components (PFC) and plasma-material interactions (PMI) including free-surface liquid metal flow for heat removal. Selected publications:
• K. Kusumi, T. Kunugi, T. Tokomine, Z. Kawara, S. Nakamura, E. Kolemen, and H. Ji, "Thermal mixing enhancement of liquid metal MHD free-surface flow by optimizing vortex generator arrays", Fusion Eng. Design 136, 223 (2018). (pdf)
• T. Huang, C. Jin, Y. Yang, X. Wu, L. Zhuge, Q. Wang, and H. Ji, "Control of Ion Species and Energy in High-Flux Helicon-Wave Excited Plasma Using Ar/N2 Gas Mixtures", IEEE Trans. Plasma Sci. 46, 895 (2018). (pdf)
• G. Zhang, T. Huang, C. Jin, X. Wu, L. Zhuge, and H. Ji, "Development of a helicon-wave excited plasma facility with high magnetic field for plasma-wall interactions studies", Plasma Sci. Tech. 20, 085603 (2018). (pdf)
• M. Hvasta, E. Kolemen, A. Fisher, and H. Ji, "Demonstrating electromagnetic control of free-surface, liquid-metal flows relevant to fusion reactors", Nucl. Fusion 58, 016022 (2018). (pdf)
• K. Kusumi, T. Kunugi, T. Yokomine, Z. Kawara, E. Kolemen, H. Ji, and E. Gilson, "Study of Thermal Mixing of MHD Liquid Metal Free-Surface Film Flow", Fusion Sci. Tech. 72, 796 (2017). (pdf)
• K. Kusumi, T. Tokomine, Z. Kawara, T. Kunugi, J. Hinojosa, E. Kolemen, H. Ji, and E. Gilson, "Study on thermal mixing of liquid-metal free-surface flow by obstacles installed at the bottom of a channel", Fusion Eng. Design 109-111, 1193 (2016). (pdf)
• J. Rhoads, E. Edlund, and H. Ji, "Effects of magnetic field on the turbulent wake of a cylinder in free-surface magnetohydrodynamic channel flow", J. Fluid Mech. 742, 446 (2014) (pdf, movie)
• C. Jin, T. Yu, Y. Zhao, Y. Bo, C. Ye, J. Hu, L. Zhuge, S. Ge, X. Wu, H. Ji, and J. Li, "Helicon Plasma Discharge in a Toroidal Magnetic Field of the Tokamak", IEEE Trans. Plasma Sci. 39, 3103 (2011). (pdf)
• M. Nornberg, H. Ji, J.L. Peterson, and J.R. Rhoads, "A liquid metal flume for free surface magnetohydrodynamic experiments", Rev. Sci. Instru. 79, 094501 (2008). (pdf)
• H. Ji, W. Fox, D. Pace, and H. Rappaport, "Study of Magnetohydrodynamic Surface Waves in Liquid Gallium", Phys. Plasmas 12, 012102 (2005). (Abstract) (pdf)

• Participation of satellite missions to study space plasmas. Selected publications:
• A. Vaivads et al., "Turbulence Heating ObserveR - satellite mission proposal", J. Plasma Phys. 82, 905820501 (2016). (pdf)
• A. Vaivads et al., "EIDOSCOPE: Particle Acceleration at Plasma Boundaries", Experimental Astronomy 33, 461 (2012).

• Dynamo EMF measurements, magnetic helicity conservation, fluctuation driven transport, confinement improvement in the Madison Symmetric Torus (MST), a medium-sized, toroidal reversed field pinch (RFP) device in the Department of Physics at the University of Wisconsin-Madison. Selected publications:
  • K. Kemel, A. Brandenburg, and H. Ji, "Model of driven and decarying magnetic turbulence in a cylinder", Phys. Rev. E 84, 056407 (2011) (pdf)
  • E. Blackman and H. Ji, "Laboratory plasma dynamos, astrophysical dynamos and magnetic helicity evolution", Monthly Notices of Royal Astronomical Society 369, 1837(2006). (pdf)
  • H. Ji and S.C. Prager, "The Alpha Dynamo Effects in Laboratory Plasmas", Magnetohydrodynamics 18, 191(2002). (Abstract) (pdf)
  • H. Ji, "Turbulent Dynamos and Magnetic Helicity", Phys. Rev. Lett. 83, 3198(1999). (Abstract) (pdf)
  • H. Ji, A.F.Almagri, S.C.Prager, and J.S.Sarff, "Time-resolved Observation of Discrete and Continuous MHD Dynamo in the Reversed-Field Pinch Edge", Phys. Rev. Lett. 73, 668 (1994). (Abstract) (pdf)
  • H. Ji et al., "Effect of Collisionality and Diamagnetism on the Plasma Dynamo", Phys. Rev. Lett. 75, 1086 (1995). (Abstract) (pdf)
  • H. Ji et al., "Measurement of the dynamo effect in a plasma", Phys. Plasmas 3, 1935 (1996). (Abstract) (pdf)
  • H. Ji, S.C.Prager, and J.S.Sarff, "Conservation of Magnetic Helicity during Plasma Relaxation", Phys. Rev. Lett. 74, 2945 (1995). (Abstract) (pdf)
  • M.R. Stoneking et al., "Particle Transport due to Magnetic Fluctuations", Phys. Rev. Lett. 73, 549 (1994). (pdf)
  • J.S. Sarff, S.A. Hokin, H. Ji, S.C.Prager, and C.R. Sovinec, "Fluctuation and Transport Reduction in a Reversed Field Pinch by Inductive Poloidal Current Drive", Phys. Rev. Lett. 72, 3670 (1994). (pdf)
  
  
• Concept innovation for magnetically confined fusion plasmas in the proposed SPIRIT (Self-organized Plasmas with Induction, Reconnection, and Injection Techniques): Field Reversed Configuration (FRC) plasmas formed by counter-helicity merging of spheromaks and low-aspect-ratio Reversed Field Pinch (RFP) plasmas formed by co-helicity merging of spheromaks. Selected Publications:
  • S. Gerhardt, E. Belova, M. Yamada, H. Ji, Y. Ren, B. McGeehan, M. Inomoto, "Field-reversed configuration formation scheme utilizing a spheromak and solenoid induction", Physics of Plasmas 15, 032503 (2008). (pdf)
  • S. Gerhardt, E. Belova, M. Yamada, H. Ji, M. Inomoto, Y. Ren, B. McGeehan, "New method for inductively forming an oblate field reversed configuration from a spheromak". Nuclear Fusion 48, 032001 (2008). (pdf)
  • S. Gerhardt, E. Belova, M. Yamada, H. Ji, M. Inomoto, C, Jacobson, R. Maqueda, B. McGeehan, Y. Ren, "Inductive sustainment of oblate field-reversed configurations with the assistance of magnetic diffusion, shaping, and finite-Larmor radius stabilization", Physics of Plasmas 15, 022503 (2008). (pdf)
  • S. Gerhardt, E. Belova, M. Yamada, H. Ji, M. Inomoto, R. Ren, B. McGeehan, "Inductive Sustainment of a Field-Reversed Configuration Stabilized by Shaping, Magnetic Diffusion, and Finite-Larmor-Radius Effects", Physical Review Letters 99, 245003 (2007). (pdf)
  • M. Yamada, H. Ji, S. Gerhardt, E. Belova, R. Davidson, D. Mikkelsen, "A Self-Organize Plasma with Induction, Reconnection, and Injection Techniques: the SPIRIT Concept for Field Reversed Configuration Research", Plasma Fusion Res. 2, 004 (2007). (pdf)
  • S. P. Gerhardt, E. Belova, M. Inomoto, M. Yamada, H. Ji, Y. Ren, and A. Kuritsyn, "Equilibrium and stability studies of oblate field-reversed configurations in the Magnetic Reconnection Experiment", Phys. Plasmas 13, 112508 (2006) (pdf)
  • H. Ji, E. Belova, S. P. Gerhardt, and M. Yamada, "Recent Advances in the SPIRIT (Self-organized Plasma with Induction, Reconnection, and Injection Techniques) Concept", J. Fusion Energy (2006) (pdf)
  • Elena V. Belova, Ronald C. Davidson, Hantao Ji, and Masaaki Yamada, "Advances in the numerical modeling of field-reversed configurations", Phys. Plasmas 13, 056115 (2006).
  • E.V. Belova, R.C. Davidson, H. Ji, M. Yamada, C.D. Cothran, M.R. Brown and M.J. Schaffer, "Numerical study of the formation, ion spin-up and nonlinear stability properties of field-reversed configurations", Nucl. Fusion 46, 162-170 (2006).
    
  • E. Belova, R. Davidson, H. Ji, and M. Yamada, "Kinetic effects on the stability properties of field-reversed configurations. II. Nonlinear evolution", Phys. Plasmas 11, 2523(2004).
  • E. Belova, R. Davidson, H. Ji, and M. Yamada, "Kinetic effects on the stability properties of field-reversed configurations. I. Linear stability", Phys. Plasmas 10, 2361(2003).
  • E. Belova, S. Jardin, H. Ji, M. Yamada, and R. Kulsrud, "Numerical study of global stability of oblate field-reversed configurations", Phys. Plasmas 8, 1267(2001). (Abstract) (pdf)
  • E. Belova, S. Jardin, H. Ji, M. Yamada, and R. Kulsrud, "Numerical study of tilt stability of prolate field-reversed configurations", Phys. Plasmas 7, 4996(2000). (Abstract) (pdf)
  • A. B. Hassam, R. M. Kulsrud, R. J. Goldston, H. Ji, and M. Yamada, "Steady State Thermoelectric Field-Reversed Configurations", Phys. Rev. Lett. 83, 2969(1999). (Abstract) (pdf)
  • H. Ji et al., "Studies of Global Stability of Field-reversed Configuration Plasmas Using a Rigid Body Model", Phys. Plasmas 5, 3685(1998). (Abstract) (pdf)
  
  
• 3D helical divertor design in the Large helical device (LHD), the world's largest stellarator being built at the National Institute for Fusion Science, Japan. Selected publications:
  • N. Ohyabu, N. Noda, H. Ji et al., "Helical Divertor in the Large Helical Device", J. Nucl. Mater. 196-198, 276 (1992).
  • O. Motojima et al., "Physics and Engineering Design Studies on the Large Helical Device", Fusion Eng. Design 20, 3 (1993).
  • N. Ohyabu, T. Watanabe, H. Ji et al., "The Large Helical Device (LHD) Helical Divertor", Nucl. Fusion 34, 387 (1994).
  
  
• Fluctuation driven transport, dynamo measurements, and anomalous ion heating in the Reversed Field Pinch University of Tokyo Experiment (REPUTE-1), a small-to-medium-sized, toroidal reversed field pinch (RFP) device at the University of Tokyo, Japan. Selected publications:
  • H. Ji, H. Toyama, K. Miyamoto, S. Shinohara, and A. Fujisawa, "Fluctuation and Electron-Heat Transport in a Reversed-Field-Pinch Plasma", Phys. Rev. Lett. 67, 62 (1991). (Abstract) (pdf)
  • H. Ji, H. Toyama, A. Fujisawa, S. Shinohara, and K. Miyamoto, "Fluctuation and Edge Current Sustainment in a Reversed-Field-Pinch", Phys. Rev. Lett. 69, 616 (1992). (Abstract) (pdf)
  • H. Ji et al., "Probe measurements in the REPUTE-1 reversed field pinch", Rev. Sci. Instrum. 62, 2326 (1991). (pdf)
  • A. Fujisawa, H. Ji et al., "Anomalous Ion Temperature and Plasma Resistance due to MHD Fluctuation in REPUTE-1 RFP Plasma", Nucl. Fusion 31, 1443 (1991). (pdf)