Title :
Synchrotron radiation perturbations in long transport lines
Author :
Leleux, G. ; Nghiem, P. ; Tkatchenko, A.
Author_Institution :
Lab. Nat. Saturne, CENS, Gif-sur-Yvette, France
Abstract :
The analytic formalism developed shows that the beam matrix representing synchrotron radiation perturbations are proportional to ( sigma /sub E//E)/sup 2/ approximately gamma /sup 5// rho /sup 2/. Therefore, the induced emittance growths increase drastically with energy for a given bending radius. In order to reduce beam degradations while conserving a reasonable bending radius, the results suggest that the use of optical structures such as isochronous and symmetric achromats is highly desirable. In addition, matching of the input beam to the Twiss ellipses of the achromat is necessary. In this case, bunch lengthening is minimized and transverse emittance growth is only governed by the (H) function which evidently must be as small as possible.<>
Keywords :
beam handling techniques; synchrotron radiation; Twiss ellipses; analytic formalism; beam degradations; beam matrix; bending radius; induced emittance growths; optical structures; symmetric achromats; synchrotron radiation perturbations; transverse emittance growth; Azimuth; Degradation; Electron beams; Electron emission; Electron optics; Magnetic analysis; Magnets; Optical beams; Stimulated emission; Synchrotron radiation;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164353
