BIW2012 - List of Authors (Gallo, A.)

Paper	Title	Page
TUPG001	Mitigation and Control of Instabilities in DAΦNE Positron Ring	136
	A. Drago, D. Alesini, T. Demma, A. Gallo, S. Guiducci, C. Milardi, P. Raimondi, M. Zobov INFN/LNF, Frascati (Roma), Italy
	The positron beam in the DAΦNE e⁺e⁻ collider has always been suffering from strong e-cloud instabilities. In order to cope with them, several approaches have been adopted along the years: flexible and powerful bunch-by-bunch feedback systems, solenoids around the straight sections of the vacuum chamber and, in the last runs, e-cloud clearing electrodes inside the bending and wiggler magnets. Of course classic diagnostics tools have been used to evaluate of the effectiveness of the adopted measures and the correct setup of the devices, in order to acquire the total beam current and the bunch-by-bunch currents, to plot in real time synchrotron and betatron instabilities, to verify the vertical beam size enlargement in collision and out of collision. Besides, to evaluate the efficacy of the solenoids and of the clearing electrodes versus the instability speed, the more powerful tools have been the special diagnostics routines making use of the bunch-by-bunch feedback systems to quickly compute the growth rate instabilities in different beam conditions.

Paper

Title

Page

Mitigation and Control of Instabilities in DAΦNE Positron Ring

136

A. Drago, D. Alesini, T. Demma, A. Gallo, S. Guiducci, C. Milardi, P. Raimondi, M. Zobov
INFN/LNF, Frascati (Roma), Italy

The positron beam in the DAΦNE e⁺e⁻ collider has always been suffering from strong e-cloud instabilities. In order to cope with them, several approaches have been adopted along the years: flexible and powerful bunch-by-bunch feedback systems, solenoids around the straight sections of the vacuum chamber and, in the last runs, e-cloud clearing electrodes inside the bending and wiggler magnets. Of course classic diagnostics tools have been used to evaluate of the effectiveness of the adopted measures and the correct setup of the devices, in order to acquire the total beam current and the bunch-by-bunch currents, to plot in real time synchrotron and betatron instabilities, to verify the vertical beam size enlargement in collision and out of collision. Besides, to evaluate the efficacy of the solenoids and of the clearing electrodes versus the instability speed, the more powerful tools have been the special diagnostics routines making use of the bunch-by-bunch feedback systems to quickly compute the growth rate instabilities in different beam conditions.