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RIS citation export for WEVIR01: Use of Reverse Bending Magnets in MBA Lattices

AU  - Streun, A.
ED  - Schaa, Volker RW
TI  - Use of Reverse Bending Magnets in MBA Lattices
J2  - Proc. of IPAC2020, Caen, France, 10-15 May 2020
CY  - Caen, France
T2  - International Particle Accelerator Conference
T3  - 11
LA  - english
AB  - Including reverse bending magnets further reduces the equilibrium emittance of multi-bend achromat (MBA) lattices through decoupling of dispersion and horizontal beta function. This coupling is a shortcoming of the classical theoretical minimum emittance (TME) cell preventing it from reaching lowest emittance at realistic, moderate focusing conditions. Rather small deflection angles of the reverse bends, in the order of 10% of the unit cell bending angle, are usually sufficient, and realized through down-feed by displacing the horizontally focusing quadrupoles of the unit cell by a small amount towards the storage ring inside. Reverse bends are indispensable in particular to enable emittance reduction from dipoles with longitudinal field variation, since these require very small dispersion at the central region of highest field strength. In past decades reverse bends were employed occasionally for isochronous lattices or to enhance damping. Now they are becoming an integral component of low emittance MBA lattices.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
ER  -