TY - GEN
T1 - Challenges for energy ramping in a compact booster synchrotron
AU - Mikhailov, S. F.
AU - Wu, Y. K.
AU - Li, J.
AU - Popov, V. G.
AU - Hartman, S. M.
PY - 2007
Y1 - 2007
N2 - A booster synchrotron has been recently commissioned at Duke University FEL Laboratory as a part of the High Intensity Gamma-ray Source (HIGS) facility. The booster provides top-off injection into the storage ring in the energy range of 0.24 - 1.2 GeV. In order to minimize the cost of the project, the booster is designed with a very compact footprint. As a result, unconventionally high field bending magnets at 1.76 T are required. A main ramping power supply drives all dipoles and quadrupoles. Quadrupole trims are used to compensate for tune changes caused by the change of relative focusing strength during ramping. Sextupoles compensate for chromatic effects caused by dipole magnet pole saturation. All these compensations have to be performed as a function of beam energy. Above 1.1 GeV, where the magnets are heavily saturated, the reduction of dynamic aperture is compensated by redistribution of strength among the sextupole families. With these compensations, effects of the magnet saturation do not cause any considerable beam loss during injection, energy ramping, and extraction.
AB - A booster synchrotron has been recently commissioned at Duke University FEL Laboratory as a part of the High Intensity Gamma-ray Source (HIGS) facility. The booster provides top-off injection into the storage ring in the energy range of 0.24 - 1.2 GeV. In order to minimize the cost of the project, the booster is designed with a very compact footprint. As a result, unconventionally high field bending magnets at 1.76 T are required. A main ramping power supply drives all dipoles and quadrupoles. Quadrupole trims are used to compensate for tune changes caused by the change of relative focusing strength during ramping. Sextupoles compensate for chromatic effects caused by dipole magnet pole saturation. All these compensations have to be performed as a function of beam energy. Above 1.1 GeV, where the magnets are heavily saturated, the reduction of dynamic aperture is compensated by redistribution of strength among the sextupole families. With these compensations, effects of the magnet saturation do not cause any considerable beam loss during injection, energy ramping, and extraction.
UR - http://www.scopus.com/inward/record.url?scp=51349152398&partnerID=8YFLogxK
U2 - 10.1109/PAC.2007.4441033
DO - 10.1109/PAC.2007.4441033
M3 - Conference contribution
AN - SCOPUS:51349152398
SN - 1424409179
SN - 9781424409174
T3 - Proceedings of the IEEE Particle Accelerator Conference
SP - 1212
EP - 1214
BT - Proceedings of the IEEE Particle Accelerator Conference, PAC07
T2 - IEEE Particle Accelerator Conference, PAC07
Y2 - 25 June 2007 through 29 June 2007
ER -