4 papers

title:	Experimental non linear beam dynamics studies with a turn-by-turn phase space monitor at SPEAR
format:	conference procceeding
conference:	ICFA Workshop on Nonlinear and Collective Phenomena in Beam Physics
year:	1999
3 authors:	Terebilo, A. | C. Pellegrini | M. Cornacchia
abstract:	About 10 years ago the possibility of using turn-by-turn phase beam position monitors to gain insight into phase space dynamics of a single particle in a storage ring raised some interest among accelerator physicists. It was soon argued that Landau damping and collective effects would seriously complicate the interpretation of data. We have established that in SPEAR it is possible to lock a single bunch into a collective 'rigid body' mode. When in this mode the bunch will behave similar to a super particle of finite size with the charge equal to that of the bunch. In this paper we report on experiments that demonstrate this effect. We also numerically study the strong coupling limit, in which the transition to 'rigid body' motion occurs, for the two models proposed earlier. We present the experiments on non-linear resonance crossing and frequency map measurement in the 'super particle' framework. (11 References).
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title:	Observations, Measurements and Applications of a Steady Collective Mode in an Electron Storage Ring
format:	preprint
year:	1998
3 authors:	Terebilo, A. | C. Pellegrini | M. Cornacchia
abstract:	A single bunch of charged particles in a storage ring is a system of 10(9) - 10(11) coupled non-linear oscillators with radiative energy loss and compensated by the accelerating cavity. A stable collective mode in such system was induced and observed in SPEAR storage rign using a turn-by-turn phase space monitor. New possibilities of using this mode as a tool to experimentally study non-linear dynamics in storage rings are discussed.
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title:	Measurement of the variation of machine parameters and the effect of the power supplies ripple on the instantaneous tunes at SPEAR
format:	conference procceeding
conference:	1997 Particle Accelerator Conference
year:	1998
5 authors:	Terebilo, A. | C. Pellegrini | M. Cornacchia | Corbett, J. | Martin, D.
abstract:	For long term stability analysis, time variation of tunes is important. We have proposed and tested a technique for measuring the magnitude of this variation. This was made possible by using tune extraction algorithms that require small number of turns thus giving an instantaneous tune of the machine. In this paper we demonstrate the measured effect of the tune modulation with 60 Hz power supplies ripple, power line interference from the SLAC linac operating at 30 Hz repetition rate, and non-periodic variation. (8 References).
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title:	Experimental nonlinear beam dynamics studies at SPEAR
format:	conference procceeding
conference:	1997 Particle Accelerator Conference
year:	1998
5 authors:	Terebilo, A. | C. Pellegrini | M. Cornacchia | Corbett, J. | Martin, D.
abstract:	The frequency map analysis of a Hamiltonian system recently introduced to accelerators physics in combination with turn-by-turn phase space measurements opens new experimental opportunities for studying nonlinear dynamic in storage rings. In this paper we report on the experimental program at SPEAR having the goal of measuring the frequency map of the machine. In this paper we discuss the accuracy of the instantaneous tune extraction from experimental data and demonstrate the possibility of frequency map measurement. (7 References).
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