A THz Free Electron Laser (FEL) is being built in Ariel University. This project is collaboration between Ariel University, Tel Aviv University, and UCLA. Upon completion it is intended to become a user facility. The FEL is designed to emit radiation between 1 and 5  THz. It is planned to operate in the super radiance regime. The anticipated output of the FEL, is in excess of 150 KW instantaneous power. An essential part of every FEL is a device generating a periodic magnetic field denoted the wiggler. Here we describe a design of a Halbach [1] type permanent magnetic wiggler for the THz FEL.

References

[1] K. Halbach “Design of permanent multipole magnets with oriented rare earth cobalt material” Nuclear Instruments and Methods, Volume 169, Issue 1, 1 February 1980, Pages 1–10.

[2] ‎Nezah Balal, Eyal Magori & Asher Yahalom “Design of a Permanent ‎Magnet Wiggler for a THz Free Electron Laser” submitted to the proceedings of ‎XI Symposium of Magnetic Measurements (SPM), Częstochowa - Czarny Las, ‎Poland, 20th-22nd October 2014‎