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![[Figure 4]](xe5005fig4mag.jpg)
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Figure 4
The ESRF is studying the replacement of its DBA lattice (left) with a hybrid 7BA lattice (a version from late 2013 shown at right). Gaps between the first and second dipoles and the sixth and seventh dipoles in the 7BA lattice allow the dispersion (red) to grow at sextupole sites, reducing the required sextupole gradient for chromatic correction. The first two and last two dipoles have a longitudinal gradient that tailors the optics to minimize emittance, while the central three dipoles are combined dipole–quadrupole magnets. A 14 cm, 3-pole wiggler located just downstream of the central dipole serves as a hard X-ray source. Another feature is the 4.6 mrad horizontal angle built in between adjacent achromats that enables ready installation of canted undulators, an angle made up by horizontally displacing the defocusing quadrupoles flanking the insertion straight when no canting is used. Note the vertical scale on the right is magnified by a factor of four. (Courtesy of P. Raimondi, ESRF.) |
![[Figure 4]](xe5005fig4.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
