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![[Figure 2]](me0292fig2mag.jpg)
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Figure 2
Schematic diagram of an energy-recovery linac source of synchrotron radiation. A bright electron source injects electron bunches at a rate of up to 1.3 GHz into a superconducting linac cavity that accelerates electrons to a full energy of 5 GeV (the green balls `surfing' on the crest of the RF travelling wave). They circulate around a return arc producing brilliant X-ray beams in undulators (shown in red rectangles). The circumference of the arc is adjusted so that the pathlength of the electrons returning to the linac is 180° out of accelerating phase. Thus these (red balls) electrons ride in the trough of the RF wave and now give up their energy to the cavity. After being decelerated to low energy they are directed to a beam dump. Each electron makes one trip around the arc and its energy is recycled in the main linac, hence the name, energy-recovery linac. As opposed to storage rings, the bunch brilliance is primarily limited by the injector, not equilibration within the loop lattice. (Graphics provided by D. Bilderback.) |
![[Figure 2]](me0292fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
