CERN, Geneva
PS2 is a design study of a conventional magnet synchrotron considered to replace the existing PS at CERN. In this paper, studies on different aspect of single particle dynamics in the nominal PS2 Negative Momentum Compaction lattice are described. The global tuning flexibility of the ring and the geometric acceptance is demonstrated by a systematic scan of quadrupole settings. Frequency map analysis and dynamic aperture plots for two different chromaticity correction schemes are presented. The impact of magnet misalignments on the dynamic aperture is studied for one of them. A first study of the beam dynamics with magnetic multipole errors using frequency maps and the corresponding analytical tune-spread footprints is reported. It is thus demonstrated that multipole errors determine to a large extend the beam dynamics in PS2.
LBNL, Berkeley, California
CERN, Geneva
SLAC, Menlo Park, California
A new proton synchrotron, the PS2, was proposed to replace the current proton synchrotron at CERN for the LHC injector upgrade. Nonlinear space charge effects could cause significant beam emittance growth and particle losses and limit the performance of the PS2. In this paper, we report on simulation studies of the potential space-charge effects at the PS2 using three-dimensional self-consistent macro-particle tracking. We will discuss the impact of space-charge effects on the beam emittance growth, especially due to synchro-betatron coupling, aperture sizes, initial painted distribution, and RF ramping schemes. The computational model used in the simulation will also be discussed.
CERN, Geneva
Beam losses are a potential limiting factor in the performance in any high intensity synchrotron. For the new CERN PS2, an overall low loss design has been adopted. However, it is unavoidable that due to different processes a certain fraction of particles leave the beam core populating the so-called beam halo. A collimation system removes in a controlled way all particles outside the prescribed betatron and collimator acceptances. This article presents a two-stage betatron collimation design as an optical device for different long straight sections layouts. Parametric studies for the different main design parameters are presented and their influence in the expected cleaning efficiency of the system is analyzed and compared to the accepted thresholds of admissible losses. Finally, different errors were introduced in the lattice to test the robustness of the design against realistic operation scenarios.