Centre for Plasma Physics, The Queen's University of Belfast, United Kingdom.
Phys Rev Lett. 2010 Oct 22;105(17):175002. doi: 10.1103/PhysRevLett.105.175002. Epub 2010 Oct 19.
Slowly evolving, regularly spaced patterns have been observed in proton projection images of plasma channels drilled by intense (≳10¹⁹ W cm⁻²) short (∼1 ps) laser pulses propagating in an ionized gas jet. The nature and geometry of the electromagnetic fields generating such patterns have been inferred by simulating the laser-plasma interaction and the following plasma evolution with a two-dimensional particle-in-cell code and the probe proton deflections by particle tracing. The analysis suggests the formation of rows of magnetized soliton remnants, with a quasistatic magnetic field associated with vortexlike electron currents resembling those of magnetic vortices.
在强（≳10¹⁹ W·cm⁻²）短（∼1 ps）激光脉冲在电离气体射流中传播时，在等离子体通道的质子投影图像中观察到缓慢演变、规则间隔的图案。通过二维粒子模拟激光等离子体相互作用和随后的等离子体演化，并通过粒子追踪模拟质子的偏转，推断出产生这种图案的电磁场的性质和几何形状。分析表明，形成了磁化孤子残余物的行，与涡旋状电子电流相关联的准静态磁场类似于磁涡旋的磁场。
