Cyclotron Autoresonance Accelerator for Electron Beam Dry Scrubbing of Flue Gases

A self-scanning, highly-efficient electron beam source is being built for electron beam dry scrubbing (EBDS) of flue gases. The beam is to be prepared using cyclotron autoresonance acceleration (CARA), which has already experimentally demonstrated an rf efficiency above 90%. The design is based on simulation studies for a 250-kV, 25-A warm injected beam which is accelerated in a 112cm long CARA using 21 MW of rf power at 2.856 GHz. The accelerated gyrating beam has an energy of nearly 1.1 MeV, with a theoretical acceleration efficiency of 99%. The beam can be extracted from CARA through a foil window, once the axial magnetic field is down-tapered to zero, and self-scan on a conical surface across a rising flue gas stream in a field-free region.