Current neutralization and plasma polarization for intense ion beams propagating through magnetized background plasmas in a two-dimensional slab approximation

Abstract

A two-dimensional electromagnetic Particle-in-Cell (PIC) simulation model is proposed to study the propagation of intense ion beams with beam width w_b small compared to the electron skin depth c/ω_pe through background plasmas in the presence of external applied magnetic fields. The effective electron gyroradius w_ge is found to be an important parameter for ion beam transport in the presence of magnetic fields. In the beam regions, the background plasmas respond differently to the ion beam of width w_b<w_ge and w_b>w_ge for the given magnetic field and beam energy. For the case of beam width w_b<w_gewith relative weak external magnetic fields, the rotation effects of plasma electrons are found to be significant and contributes to the significant enhancement of the self-electric and self-magnetic fields. While for the case of beam width w_b>w_ge with relative strong external magnetic fields, the rotation effects of plasma electrons are strongly inhibited and a well neutralization of ion beam current can be found. Finally, the influences of different beam widths, beam energies and magnetic fields on the neutralization of ion beam current are summarized for the cases of w_b<w_ge<c/ω_ge, w_ge<w_b<c/ω_pe and w_b<c/ω_pe<w_ge.

Graphical abstract

Keywords

current neutralization / ion beams / magnetized plasmas / Particle-in-Cell simulations

References

[1] A. Ng, T. Ao, F. Perror, M. W. C. Dharma-Wardana, and M. E. Foord, Idealized slab plasma approach for the study of warm dense matter, Laser Part. Beams, 2005, 23(04): 527

[2] R. P. Drake, High-Energy-Density Physics, Berlin: Springer-Verlag, 2006

[3] N. A. Tahir, D. H. H. Hoffmann, A. Kozyreva, A. Shutov, J. A. Maruhn, U. Neuner, A. Tauschwitz, P. Spiller, and R. Bock, Shock compression of condensed matter using intense beams of energetic heavy ions, Phys. Rev. E, 2000, 61(2): 1975

[4] N. A. Tahir, D. H. H. Hoffmann, A. Kozyreva, A. Shutov, J. A. Maruhn, U. Neuner, A. Tauschwitz, P. Spiller, and R. Bock, Equation-of-state properties of high-energy-density matter using intense heavy ion beams with an annular focal spot, Phys. Rev. E, 2000, 62(1): 1224

[5] P. K. Roy, S. S. Yu, E. Henestroza, A. Anders, F. M. Bieniosek, J. Coleman, S. Eylon, W. G. Greenway, M. Leitner, B. G. Logan, W. L. Waldron, D. R. Welch, C. Thoma, A. B. Sefkow, E. P. Gilson, P. C. Efthimion, and R. C. Davidson, Drift compression of an intense neutralized ion beam, Phys. Rev. Lett., 2005, 95(23): 234801

[6] S. S. Yu, R. P. Abbott, R. O. Bangerter, J. J. Barnard, R. J. Briggs, D. Callahan, C. M. Celata, R. Davidson, C. S. Debonnel, S. Eylon, A. Faltens, A. Friedman, D. P. Grote, P. Heitzenroeder, E. Henestroza, I. Kaganovich, J. W. Kwan, J. F. Latkowski, E. P. Lee, B. G. Logan, P. F. Peterson, D. Rose, P. K. Roy, G. L. Sabbi, P. A. Seidl, W. M. Sharp, and D. R. Welch, Heavy ion fusion (HIF) driver point designs, Nucl. Instrum. Methods Phys. Res. A, 2005, 544(1-2): 294

[7] I. D. Kaganovich, G. Shvets, E. Startsev, and R. C. Davidson, Nonlinear charge and current neutralization of an ion beam pulse in a pre-formed plasma, Phys. Plasmas, 2001, 8(9): 4180

[8] D. R. Welch, D. V. Rose, B. V. Oliver, and R. E. Clark, Simulation techniques for heavy ion fusion chamber transport, Nucl. Instrum. Methods Phys. Res. A, 2001, 464(1-3): 134

[9] I. D. Kaganovich, E. Startsev, and R. C. Davidson, Nonlinear plasma waves excitation by intense ion beams in background plasma, Phys. Plasmas, 2004, 11(7): 3546

[10] E. Henestroza, S. Eylon, P. Roy, S. Yu, A. Anders, F. Bieniosek, W. Greenway, B. Logan, R. MacGill, D. Shuman, D. Vanecek, W. Waldron, W. Sharp, T. Houck, R. Davidson, P. Efthimion, E. Gilson, A. B. Sefkow, D. R. Welch, D. Rose, and C. Olson, Design and characterization of a neutralizedtransport experiment for heavy-ion fusion, Phys. Rev. ST Accel. Beams, 2004, 7(8): 083501

[11] P. K. Roy, S. S. Yu, S. Eylon, E. Henestroza, A. Anders, F. M. Bieniosek, W. G. Greenway, B. G. Logan, W. L. Waldron, D. L. Vanecek, D. R. Welch, D. V. Rose, R. C. Davidson, P. C. Efthimion, E. P. Gilson, A. B. Sefkow, and W. M. Sharp, Results on intense beam focusing and neutralization from the neutralized beam experiment, Phys. Plasmas, 2004, 11(5): 2890

[12] P. K. Roy, S. S. Yu, S. Eylon, E. Henestroza, A. Anders, E. P. Gilson, F. M. Bieniosek, W. G. Greenway, B. G. Logan, W. L. Waldron, D. B. Shuman, D. L. Vanecek, D. R. Welch, D. V. Rose, R. C. Davidson, P. C. Efthimion, I. D. Kaganovich, A. B. Sefkow, and W. M. Sharp, Drift compression and final focus options for heavy ion fusion, Nucl. Instrum. Methods Phys. Res. A, 2005, 544(1-2): 255

[13] J. S. T. Ng, P. Chen, H. Baldis, P. Bolton, D. Cline, W. Craddock, C. Crawford, F. J. Decker, C. Field, Y. Fukui, V. Kumar, R. Iverson, F. King, R. E. Kirby, K. Nakajima, R. Noble, A. Ogata, P. Raimondi, D. Walz, and A. W. Weidemann, Observation of plasma focusing of a 28.5 GeV positron beam, Phys. Rev. Lett., 2001, 87(24): 244801

[14] H. Qin, R. C. Davidson, J. J. Barnard, and E. P. Lee, Drift compression and final focus options for heavy ion fusion, Nucl. Instrum. Methods Phys. Res. A, 2005, 544(1-2): 255

[15] R. C. Davidson and H. Qin, Kinetic description of neutralized drift compression and transverse focusing of intense ion charge bunches, Phys. Rev. ST Accel. Beams, 2005, 8(6): 064201

[16] A. B. Sefkow and R. C. Davidson, Theoretical models for describing longitudinal bunch compression in the neutralized drift compression experiment, Phys. Rev. ST Accel. Beams, 2006, 9(9): 090101

[17] I. D. Kaganovich, E. A. Startsev, A. B. Sefkow, and R. C. Davidson, Charge and current neutralization of an ion-beam pulse propagating in a background plasma along a Solenoidal magnetic field, Phys. Rev. Lett., 2007, 99(23): 235002

[18] M. A. Dorf, I. D. Kaganovich, E. A. Startsev, and R. C. Davidson, Enhanced self-focusing of an ion beam pulse propagating through a background plasma along a Solenoidal magnetic field, Phys. Rev. Lett., 2009, 103(7): 075003

[19] T. Namiki, A new FDTD algorithm based on alternatingdirection implicit method, IEEE Trans. Microw. Theory Tech., 1999, 47(10): 2003

[20] R. W. Hockney and J. W. Eastwood, Computer Simulation Using Particles, New York: McGraw-Hill, 1981

[21] J. P. Berenger, A perfectly matched layer for the absorption of electromagnetic waves, J. Comput. Phys., 1994, 114(2): 185

[22] J. Villasenor and O. Buneman, Rigorous charge conservation for local electromagnetic field solvers, Comput. Phys. Commun., 1992, 69(2-3): 306

[23] M. A. Dorf, I. D. Kaganovich, E. A. Startsev, and R. C. Davidson, Whistler wave excitation and effects of selffocusing on ion beam propagation through a background plasma along a solenoidal magnetic field, Phys. Plasmas, 2010, 17(2): 023103

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