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A wiggler is an insertion device in a synchrotron. It is a series of magnets designed to periodically laterally deflect ('wiggle') a beam of charged particles (invariably electrons or positrons) inside a storage ring of a synchrotron. These deflections produce emission of broadband synchrotron radiation much like that of a bending magnet, but the intensity is higher due to the contribution of many magnet dipoles in the wiggler.
A wiggler has a broader spectrum of radiation than an undulator.
Typically the magnets in a wiggler are arranged in a Halbach array.
The design shown above is usually known as a Halbach wiggler.
