Title :
Operation of Aladdin at lowered emittance
Author :
Bisognano, J.J. ; Bosch, R.A. ; Eisert, D.E. ; Green, M.A. ; Kleman, K.J. ; Trzeciak, W.S.
Author_Institution :
Synchrotron Radiat. Center, Wisconsin Univ., Madison, WI, USA
Abstract :
To increase the available photon flux density for users, alternate lattice tunings of the Aladdin synchrotron light source have been developed with horizontal emittances significantly lower than the present value of 127 π nm-rad. Reduction of the horizontal emittance by a factor of three has been obtained experimentally. When the fourth harmonic Landau cavity is used to lengthen the bunch, the observed beam lifetime with the new lattice is not significantly changed from that of the existing lattice. The present goal is to achieve a factor of four horizontal and a factor of two vertical emittance reduction routinely. Progress in making this new configuration fully operational is discussed, including the use of quadrupole shunts with correction software for beta function and dispersion correction, understanding of a mode coupling instability in higher-harmonic RF systems, RF clearing of ions, and fabrication of new optical monitoring stations
Keywords :
accelerator RF systems; electron accelerators; particle beam diagnostics; storage rings; Aladdin; RF systems; beam lifetime; beta function; dispersion; emittance; fourth harmonic Landau cavity; horizontal emittance; lattice tunings; mode coupling instability; quadrupole shunts; Compaction; Lattices; Light sources; Magnetic flux; Optical coupling; Optical device fabrication; Radio frequency; Stability; Synchrotron radiation; Undulators;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987868
