Talman, R

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Laboratory of Nuclear Studies, Cornell UniversityAugust, 2000THE STORAGE RING AS RADIATION SOURCERichard TalmanLaboratory of Nuclear StudiesCornell UniversityIthaca NY 14853ABSTRACTThese notes derive from my part of a course on using storage ringsas synchrotron light sources, given with Sol Gruner, spring term 2000.Sol emphasized the \downstream" view, especially detection apparatus.My part gave an \upstream" view of the storage ring as radiation source.There is a large degree of overlap of these notes with the famous storagering report by Sands. The main dierence is the emphasis on using thering as source of photons rather than as colliding beam facility.By now there is a considerable body of material describing this topic,and detailed \handbook" formulas are available for the important quan-tities. I refer to this material occasionally, but my intention is more toemphasize the intuitive content of the subject, even when this yields for-mulas having only a semi-quantitative validity. My rationale is that it isharder to grasp the essentials of the subject than to nd and understandexact formulations once one has the general idea. To promote this ap-proach I pretend that all storage ring development has been motivated bytheir use as sources of synchrotron light, even though early generation ra-diation sources were entirely parasitic, and early ring designs were drivenby particle physics considerations.In the rst chapter I promote the view that the evolution of inter-nal/electron and external/photon beams are \essentially" equivalent, andare subject to the same formulas. To exploit this \economy" it is necessaryto apply to beams of photons terms that are familiar mainly to acceleratorphysicists. Unfortunately this (not very deep) synthesis is suciently novelthat I am unaware of any helpful references.The major deciency of these notes, at this time, is that, though imag-inary, futuristic, undulators are discussed at length, currently employedmagnetic wigglers and undulators are not|in the original course syllabuswigglers were regarded as being downstream. The essential ideas are cov-ered, however. Another deciency is that, though the main ingredientsof FEL theory are described, they are not stitched together coherently.Also, though supposedly sophisticated statistical methods (such as Fokker-Planck) are explained, no examples are included (at this time.)

The Storage Ring as Radiation Source

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