HB2012 - List of Keywords (beam-loading)

Paper	Title	Other Keywords	Page
WEO1A04	Longitudinal Instabilities in the SPS and Beam Dynamics Issues with High Harmonic RF Systems	emittance, synchrotron, damping, controls	358
	E.N. Shaposhnikova, T. Argyropoulos, T. Bohl, J. Esteban Müller, H. Timko CERN, Geneva, Switzerland
	Even after a successful impedance reduction programme which eliminated the microwave instability in the SPS another longitudinal instability is still one of the main intensity limitations. It is observed during acceleration ramp for both single bunch and multibunch beams at intensities below the nominal LHC intensity. With the lower transition energy of the new SPS optics, under intensive studies now, the thresholds are increased. However, even in this case the operation of the 4th harmonic RF system is required for stability of the nominal beams. To cope with the higher intensity beams required for the future High Luminosity LHC an upgrade program for both RF systems is under way. The results of studies of the parameter space required for beam stability are presented and compared with operation modes of double RF systems in other accelerators.
	Slides WEO1A04 [6.135 MB]

Paper

Title

Other Keywords

Page

WEO1A04

Longitudinal Instabilities in the SPS and Beam Dynamics Issues with High Harmonic RF Systems

emittance, synchrotron, damping, controls

358

E.N. Shaposhnikova, T. Argyropoulos, T. Bohl, J. Esteban Müller, H. Timko
CERN, Geneva, Switzerland

Even after a successful impedance reduction programme which eliminated the microwave instability in the SPS another longitudinal instability is still one of the main intensity limitations. It is observed during acceleration ramp for both single bunch and multibunch beams at intensities below the nominal LHC intensity. With the lower transition energy of the new SPS optics, under intensive studies now, the thresholds are increased. However, even in this case the operation of the 4th harmonic RF system is required for stability of the nominal beams. To cope with the higher intensity beams required for the future High Luminosity LHC an upgrade program for both RF systems is under way. The results of studies of the parameter space required for beam stability are presented and compared with operation modes of double RF systems in other accelerators.

Slides WEO1A04 [6.135 MB]