Xw. Zhu et Gx. Pei, A NEW POSSIBLE METHOD FOR DECREASING THE WAVELENGTH OF GYROTRON, International journal of infrared and millimeter waves, 18(11), 1997, pp. 2191-2193
The weak transverse shear magnetic field is first proposed to decrease
the working wavelength of Gyrotron. Using Lie perturbation method, we
give the modified wave particle resonant relation in guiding magnetic
field with weak transverse shear magnetic field.