English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The hybrid multi-bend achromat (HMBA) lattice concept is adopted in somediffraction-limited storage ring designs, which can permit relatively largeon-momentum dynamic aperture and relatively weak sextupoles. In a typical HMBAlattice, the main arc section is constrained by the transverse phase advancesmaking -I transformation for sextupole cancellation. In this paper, a new HMBAlattice concept with sextupole cancellation across straight section isproposed, where -I is made between adjacent dispersion bumps of two latticecells. This makes the main arc section free of the phase advance constraint,and as a result, the number of bending magnets (bends) in the lattice cell andthe cell tunes can be easily changed, thus providing more choices for latticedesign. To achieve the large phase advances required for -I in this newconcept, split bend is used as the matching bend, which is a bend split intotwo pieces with a quadrupole in between. The split bend also serves to reducethe emittance, and the large phase advances also give low beta functions in thestraight section enhancing the insertion device brightness. Besides, for agiven emittance goal, this new HMBA lattice can have less bends than thetypical HMBA lattice due to stronger focusing in bend unit cells, which isbeneficial for saving space and suppressing intra-beam scattering effect. Twolattices are given as examples to demonstrate this new concept and show itslinear and nonlinear properties, and further extension is also discussed.

Hybrid multi-bend achromat lattice with sextupole cancellation across straight section