HB2012 - List of Authors (Qiang, J.)

Paper

Title

Page

Measurement and Simulation of Luminosity Leveling in LHC via Beam Separation

451

S. Paret, J. Qiang
LBNL, Berkeley, California, USA
R. Alemany-Fernandez, R. Calaga, R. Giachino, W. Herr, D. Jacquet, G. Papotti, T. Pieloni, L. Ponce, M. Schaumann
CERN, Geneva, Switzerland
R. Miyamoto
ESS, Lund, Sweden

Funding: This work supported by the US LHC Accelerator Research Program and the National Energy Research Scientific Computing Center of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Leveling of the luminosity in LHC by means of separating the beams colliding at an interaction point is examined. An experiment in which the separation of the beams was stepwise increased to up to 2.5 times the beam width is presented. The luminosity at all IPs and emittance of the beams were measured to detect possible side effects of the collision with an offset. Strong-strong simulations that closely follow the experimental setup are discussed and compared with the measurements. Finally, potential alternatives for luminosity leveling are briefly described.

Slides WEO1C06 [1.031 MB]

THO1D01

Fully 3D Long-term Simulation of the Coupling Resonance Experiments at the CERN PS

J. Qiang, R.D. Ryne
LBNL, Berkeley, California, USA
G. Franchetti, I. Hofmann
GSI, Darmstadt, Germany
E. Métral
CERN, Geneva, Switzerland

Funding: This work is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Space-charge driven nonlinear coupling resonance can have significant impact in high intensity linac and ring operation. Such a resonance causes emittance exchange between different degrees of freedom and may result in potential particle loss from the direction with smaller aperture size. In this paper, we will report on numerical simulation studies of the resonance crossing phenomena using a previous experiment at the CERN PS including detailed three-dimensional space-charge effects and machine nonlinearity.

Slides THO1D01 [0.589 MB]

Paper	Title	Page
WEO1C06	Measurement and Simulation of Luminosity Leveling in LHC via Beam Separation	451
	S. Paret, J. Qiang LBNL, Berkeley, California, USA R. Alemany-Fernandez, R. Calaga, R. Giachino, W. Herr, D. Jacquet, G. Papotti, T. Pieloni, L. Ponce, M. Schaumann CERN, Geneva, Switzerland R. Miyamoto ESS, Lund, Sweden
	Funding: This work supported by the US LHC Accelerator Research Program and the National Energy Research Scientific Computing Center of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Leveling of the luminosity in LHC by means of separating the beams colliding at an interaction point is examined. An experiment in which the separation of the beams was stepwise increased to up to 2.5 times the beam width is presented. The luminosity at all IPs and emittance of the beams were measured to detect possible side effects of the collision with an offset. Strong-strong simulations that closely follow the experimental setup are discussed and compared with the measurements. Finally, potential alternatives for luminosity leveling are briefly described.
	Slides WEO1C06 [1.031 MB]

THO1D01	Fully 3D Long-term Simulation of the Coupling Resonance Experiments at the CERN PS
	J. Qiang, R.D. Ryne LBNL, Berkeley, California, USA G. Franchetti, I. Hofmann GSI, Darmstadt, Germany E. Métral CERN, Geneva, Switzerland
	Funding: This work is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Space-charge driven nonlinear coupling resonance can have significant impact in high intensity linac and ring operation. Such a resonance causes emittance exchange between different degrees of freedom and may result in potential particle loss from the direction with smaller aperture size. In this paper, we will report on numerical simulation studies of the resonance crossing phenomena using a previous experiment at the CERN PS including detailed three-dimensional space-charge effects and machine nonlinearity.
	Slides THO1D01 [0.589 MB]