Optimization of undulator design for high brightness sources (abstract)

Rowen, M.
July 1989
Review of Scientific Instruments;Jul1989, Vol. 60 Issue 7, p1871
Academic Journal
The properties of transverse undulators are systematically reviewed and the criteria for optimizing both the undulator and the electron beam parameters at the insert ion device are discussed. To achieve high brightness, and coherence, the maximum number ofundulator periods are desired. It is assumed the undulator is not divided into sections, separated by focussing quadrupoles, there for the length and minimum gap of the device is limited by the beam emittance and β function. A reduction of the period length corresponds to an increase in the energy first harmonic, thus to keep the same spectral output the operating beam energy is decreased, the emittance goes as E² in a storage ring, until reduced damphing and other factors start to dominate. Using conventional technologies, permanent magnet, hybrid and micropole undulators, the maximum magnetic deflection parameter K, and, therefore, flux, is limited at short period lengths even at small gaps. The optimization of undulator design, β function and beam energy for high brightness at a given wavelength is presented.


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