Development of the Cyclotron Radiation Source with Vortex property

Recently it has been shown that the radiation from a charged particle in spiral motion has vortex property. Although the cyclotron emission exists universally in nature, the vortex property has not been featured because this property is normally cancelled out due to the randomness in the gyro-phase of electrons. In order to generate the vortex radiation from mul-ti-electron in cyclotron motion, we are developing a method to control the gyro-phase by the high power gyrotron. The electrons which have cyclotron motion around the magnetic field can be phase-matched by interaction with the external high power circularly polarized gyrotron beam. The coherent radiation can be obtained from these phase matched electrons.