Possible generation of a <em> γ</em>-ray laser by electrons wiggling in a background laser<xref ref-type="fn" rid="cpb142464fn1">*</xref>

Possible generation of a γ-ray laser by electrons wiggling in a background laser*

Zhang Qi-Ren†

Sketch map for the multi-section active tube. The space between two parallel black lines shows the inside of the tube, while dotted lines show the trajectories of the electron injection.