All Figures

$\begin{figure} \par\includegraphics[width=8cm,clip]{2716f1.eps} \end{figure}$ Figure 1: A schematic picture ( lower figure) of two current loops (Loop1 and Loop2) that are crossing with 90 degrees and the coordinate system ( upper figure). The system's size is N_x=300, N_y=N_z=200.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f2.eps} \end{figure}$ Figure 2: Time evolution of the isosurface of total magnetic field intensity with $\vert{\vec B}\vert$ = 0.26 during the collision of two current loops: a) t=0; b) $t= 35\tau _{\rm A}$ ; c) $t=59\tau _{\rm A}$ ; and d) $t=82\tau _{\rm A}$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f3.eps} \end{figure}$ Figure 3: Spatial structures of the electromagnetic fields at $t=59\tau _{\rm A}$ in Fig. 2c which are used in calculation of test proton orbits. a) B_x(gray scale) and vector plot of B_y-B_z on x=150. b) B_y(gray scale) and vector plot of B_x-B_z on y=100. c) E_x(gray scale) and vector plot of E_y-E_z on x=150. d) E_y(gray scale) and vector plot of E_x-E_z on y=100.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{2716f4.eps} \end{figure}$ Figure 4: a) The spatial value of the scalar product ${\vec E}\cdot{\vec B}$ in the x-z plane on y=100 at $t=59\tau _{\rm A}$ . b) The spatial value of the scalar product ${\vec E}\cdot{\vec B}$ in the y-z plane on x=150 at $t=59\tau _{\rm A}$ . The black region shows that the induced electric field is almost parallel to the local magnetic field, while the white region shows the region where the electric field is perpendicular to the local magnetic field.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{2716f5.eps} \end{figure}$ Figure 5: Proton energy spectra: (1) at $\omega _{ci}t=500$ where the power law index is about 3.6 in the high energy region; (2) at $\omega _{ci}t=1500$ , where the power law index is about 2.3 in the high energy region; (3) at $\omega _{ci}t=2500$ , where the power law index is about 2.0 in the high energy region.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{2716f6.eps} \end{figure}$ Figure 6: Proton velocity distribution functions of a) the x-direction; b) y-direction; and c) z-direction at $\omega _{ci}t=2500$ . The protons in Loop 2 can be accelerated to the negative y-direction, while the protons in Loop 1 can be accelerated to the positive z-direction.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f7.eps} \end{figure}$ Figure 7: Phase space plots of protons at $\omega _{ci}t=2500$ : a) x-V_y; and b) z-V_y. c) The spatial structure of the electric field, E_y(gray scale) and the vector plot of E_x-E_z on y=100, where the elliptic region corresponding to Fig. 4a shows that proton acceleration is dominant.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f8.eps} \end{figure}$ Figure 8: Phase space plots of protons at $\omega _{ci}t=2500$ : a) y-V_y; and b) z-V_y. c) The spatial structure of the electric field, E_x(gray scale) and the vector plot of E_y-E_z on x=150, where the elliptic region corresponding to Fig. 4b shows that proton acceleration is dominant.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f9.eps} \end{figure}$ Figure 9: Phase space plots of protons at $\omega _{ci}t=2500$ : a) x-V_z; and b) y-V_y. c) The spatial structure of the electric field, E_z(gray scale) and the vector plot of E_x-E_y on z=100, where the elliptic region corresponding to Fig. 4a shows that proton acceleration is dominant.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f10.eps} \end{figure}$ Figure 10: Phase space plots of protons at $\omega _{ci}t=2500$ : a) y-V_z; and b) z-V_z. c) The spatial structure of the electric field, E_x(gray scale) and the vector plot of E_y-E_z on x=150, where the elliptic region corresponding to Fig. 4b shows that proton acceleration is dominant.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{2716f1.eps} \end{figure}$	Figure 1: A schematic picture ( lower figure) of two current loops (Loop1 and Loop2) that are crossing with 90 degrees and the coordinate system ( upper figure). The system's size is N_x=300, N_y=N_z=200.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f2.eps} \end{figure}$	Figure 2: Time evolution of the isosurface of total magnetic field intensity with $\vert{\vec B}\vert$ = 0.26 during the collision of two current loops: a) t=0; b) $t= 35\tau _{\rm A}$ ; c) $t=59\tau _{\rm A}$ ; and d) $t=82\tau _{\rm A}$ .
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f3.eps} \end{figure}$	Figure 3: Spatial structures of the electromagnetic fields at $t=59\tau _{\rm A}$ in Fig. 2c which are used in calculation of test proton orbits. a) B_x(gray scale) and vector plot of B_y-B_z on x=150. b) B_y(gray scale) and vector plot of B_x-B_z on y=100. c) E_x(gray scale) and vector plot of E_y-E_z on x=150. d) E_y(gray scale) and vector plot of E_x-E_z on y=100.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{2716f5.eps} \end{figure}$	Figure 5: Proton energy spectra: (1) at $\omega _{ci}t=500$ where the power law index is about 3.6 in the high energy region; (2) at $\omega _{ci}t=1500$ , where the power law index is about 2.3 in the high energy region; (3) at $\omega _{ci}t=2500$ , where the power law index is about 2.0 in the high energy region.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{2716f6.eps} \end{figure}$	Figure 6: Proton velocity distribution functions of a) the x-direction; b) y-direction; and c) z-direction at $\omega _{ci}t=2500$ . The protons in Loop 2 can be accelerated to the negative y-direction, while the protons in Loop 1 can be accelerated to the positive z-direction.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f7.eps} \end{figure}$	Figure 7: Phase space plots of protons at $\omega _{ci}t=2500$ : a) x-V_y; and b) z-V_y. c) The spatial structure of the electric field, E_y(gray scale) and the vector plot of E_x-E_z on y=100, where the elliptic region corresponding to Fig. 4a shows that proton acceleration is dominant.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f8.eps} \end{figure}$	Figure 8: Phase space plots of protons at $\omega _{ci}t=2500$ : a) y-V_y; and b) z-V_y. c) The spatial structure of the electric field, E_x(gray scale) and the vector plot of E_y-E_z on x=150, where the elliptic region corresponding to Fig. 4b shows that proton acceleration is dominant.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f9.eps} \end{figure}$	Figure 9: Phase space plots of protons at $\omega _{ci}t=2500$ : a) x-V_z; and b) y-V_y. c) The spatial structure of the electric field, E_z(gray scale) and the vector plot of E_x-E_y on z=100, where the elliptic region corresponding to Fig. 4a shows that proton acceleration is dominant.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2716f10.eps} \end{figure}$	Figure 10: Phase space plots of protons at $\omega _{ci}t=2500$ : a) y-V_z; and b) z-V_z. c) The spatial structure of the electric field, E_x(gray scale) and the vector plot of E_y-E_z on x=150, where the elliptic region corresponding to Fig. 4b shows that proton acceleration is dominant.
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