Quadruple-bend achromatic low emittance lattice studies

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

doi:10.1063/1.2740070

Quadruple-bend achromatic low emittance lattice studies

Rev Sci Instrum. 2007 May;78(5):055109. doi: 10.1063/1.2740070.

Authors

M H Wang¹, H P Chang, H C Chao, P J Chou, C C Kuo, H J Tsai, S Y Lee, W M Tam, F Wang

Affiliation

¹ National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan.

PMID: 17552862
DOI: 10.1063/1.2740070

Abstract

A quadruple-bend achromatic (QBA) cell, defined as a supercell made of two double-bend cells with different outer and inner dipole bend angles, is found to provide a factor of 2 in lowering the beam emittance relative to the more conventional double-bend achromat. The ratio of bending angles of the inner dipoles to that of the outer dipoles is numerically found to be about 1.5-1.6 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 nonachromat in performance by providing a small natural beam emittance and some zero-dispersion straight sections. A lattice with 12 QBA cells and a preliminary dynamic aperture study serves as an example.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Computer-Aided Design*
Energy Transfer
Equipment Design
Equipment Failure Analysis
Radiation Dosage
Reproducibility of Results
Scattering, Radiation
Sensitivity and Specificity
Synchrotrons / instrumentation*
Transducers*