Quadruple-bend achromatic low emittance lattice studies

Author

Wang, M.H. ; Chang, H.P. ; Chou, P. ; Chao, H.C. ; Kuo, C.C. ; Lee, S.Y. ; Tam, W.M. ; Wang, F.

Author_Institution

Nat. Synchrotron Radiat. Res. Center, Hsinchu

fYear

2007

fDate

25-29 June 2007

Firstpage

86

Lastpage

88

Abstract

A quadruple-bend-achromatic (QBA) cell, defined as a super cell made of two double-bend (DB) cells with different outer and inner dipole bend angles, is found to provide a factor of two in lowering the beam emittance of electron synchrotron light sources. The ratio of bending angles of the inner dipoles to that of the outer dipoles is numerically found to be about 1.5 to 1.6 for an optimal low beam emittance in the isomagnetic condition. The QBA lattice provides an advantage over the double-bend achromat or the double-bend non-achromat in performance by providing some zero dispersion straight- sections and a small natural beam emittance. A lattice with 12 QBA cells with a preliminary dynamic aperture study serves as an example.

Keywords

beam handling techniques; electron accelerators; particle beam diagnostics; synchrotrons; beam emittance; double-bend cells; double-bend nonachromat; dynamic aperture; electron synchrotron light sources; isomagnetic condition; quadruple-bend-achromatic cell low-emittance lattice; Chaos; Damping; Electron beams; Electron emission; Intrusion detection; Lattices; Physics; Storage rings; Synchrotron radiation; Undulators;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2007. PAC. IEEE

Conference_Location

Albuquerque, NM

Print_ISBN

978-1-4244-0916-7

Type

conf

DOI

10.1109/PAC.2007.4440129

Filename

4440129