Variable short period electron beam wiggler for free electron lasers

Claim 1

A wiggler, said wiggler for use in a free electron laser, said wiggler operating on an input electron beam from said free electron laser, said wiggler comprising: a Type II superconducting material device, said Type II superconducting material device receiving said electron beam, said Type II superconducting material device interacting by means of magnetic fields with said electron beam by means of fluxoid lattices having a magnetic field of variable period generated by an external magnetic field, said external magnetic field having a field strength less than an upper critical magnetic field and greater than a lower critical magnetic field, said electron beam interacting with said magnetic field of said fluxoid lattices outputting laser radiation of a wavelength as determined by the fluxoid lattice, said wavelength of said laser radiation being proportional to a period of said wiggler, said Type II superconducting material device having a longitudinal axis; a means of drawing a vacuum about said Type II superconducting material device; a means for cooling said Type II superconducting material device to at least a temperature to make said device superconducting; a means for generating said external magnetic field, said means for generating said external magnetic field being positioned longitudinally about said longitudinal axis of said Type II superconducting material device, said external magnetic field being parallel said longitudinal axis of said Type II superconducting material device, said means for generating said external magnetic field being able to change the field strength along said longitudinal axis; and a means for powering said means for generating said external magnetic field.