Localized chromaticity correction of low-beta insertions in storage rings

Abstract

The correction of the chror

The lattice for the 50-50 GeV muon collider

“…They are placed at positions with almost the same betatron functions and dispersion function, and are separated horizontally and vertically by phase advances π so that their nonlinear effect will be confined in the region between the two sextupoles. Their horizontal phase advances are also integral numbers of π from the triplet focusing F-quadrupole so that the chromaticity compensation for that quadrupole will be most efficient [2]. The SX2's are the two vertical correction sextupoles and are placed similarly at designated locations.…”

Low Energy Ring lattice of the PEP-II asymmetric B-factory

“…The previous IR design [2] had both x and y chromatic correction sextupoles in the IR. This required two -/ opti cal modules and two beta matching sections per each half IR.…”

“…For the Low En ergy Ring (LER) we have studied several different chro matic correction schemes since the conceptual design report (CDR) [1], Based on these studies, a hybrid solution with local and semi-local chromatic sextupoles has been selected as the new baseline lattice to replace the local scheme in the CDR [2]. The new design simplifies the interaction re gion (IR) and reduces the number of sextupoles in the arcs.…”

Generation of attosecond electron bunches

“…Therefore, we decided to do a local correction by using sextupole magnets exactly where most of the chromatic aberrations appeared. A similar approach had been used in PEP-II B-factory [5] and in a new design for NLC Final Focus [6]. In order to create a dispersion function near to final focus quadrupoles Q4 and Q5, we use one extra magnet B4 at the beginning of the focusing section of the beamline.…”