RUPAC2012 - List of Keywords (closed-orbit)

Paper	Title	Other Keywords	Page
WEPPD007	Vertical Size of an Electron Beam at Siberia-2	quadrupole, betatron, coupling, sextupole	578
	A.G. Valentinov, V. Korchuganov, Y.V. Krylov, Y.L. Yupinov NRC, Moscow, Russia
	Brightness of the synchrotron radiation light sources is defined by electron beam sizes at radiation point. Horizontal size depends mainly from designed magnetic structure. Vertical size is defined by two processes: first, betatron coupling between vertical and horizontal motions and second, presence of vertical dispersion function at bending magnets. Vertical dispersion creates non-zero vertical emittance even without coupling. The report is dedicated to methods of vertical beam size decreasing at Siberia-2 storage ring. There are two families of skew-quadrupoles on the ring, one lens of every family in each of 6 cells of the magnetic structure. After analyzing of betatron coupling coefficient equation we stayed only two lenses in each family. As a result family currents for coupling compensation became much lower. In order to decrease vertical dispersion a special algorithm was developed and tested. Vertical dispersion on BPM azimuths was corrected by vertical displacements of sextupoles for chromaticity compensation. Maximal value of the dispersion became four times lower. It leaded to prominent vertical beam size decreasing.

Paper

Title

Other Keywords

Page

WEPPD007

Vertical Size of an Electron Beam at Siberia-2

quadrupole, betatron, coupling, sextupole

578

A.G. Valentinov, V. Korchuganov, Y.V. Krylov, Y.L. Yupinov
NRC, Moscow, Russia

Brightness of the synchrotron radiation light sources is defined by electron beam sizes at radiation point. Horizontal size depends mainly from designed magnetic structure. Vertical size is defined by two processes: first, betatron coupling between vertical and horizontal motions and second, presence of vertical dispersion function at bending magnets. Vertical dispersion creates non-zero vertical emittance even without coupling. The report is dedicated to methods of vertical beam size decreasing at Siberia-2 storage ring. There are two families of skew-quadrupoles on the ring, one lens of every family in each of 6 cells of the magnetic structure. After analyzing of betatron coupling coefficient equation we stayed only two lenses in each family. As a result family currents for coupling compensation became much lower. In order to decrease vertical dispersion a special algorithm was developed and tested. Vertical dispersion on BPM azimuths was corrected by vertical displacements of sextupoles for chromaticity compensation. Maximal value of the dispersion became four times lower. It leaded to prominent vertical beam size decreasing.