IPAC2012 - List of Authors (Ryne, R.D.)

Paper	Title	Page
MOPPC085	An Integrated Green Function Poisson Solver for Rectangular Waveguides	337
	R.D. Ryne LBNL, Berkeley, California, USA
	Funding: DOE Office of Science, Office of High Energy Physics and Office of Advanced Scientific Computing Research A new method is presented for solving Poisson's equation inside a rectangular waveguide. The method uses Fast Fourier Transforms (FFTs) to perform mixed convolutions and correlations of the charge density with an integrated Green function. Due to its similarity to the widely used Hockney algorithm for solving Poisson's equation in free space, this capability can be easily implemented in many existing particle-in-cell beam dynamics codes.

TUEPPB013	Development of an Advanced Computational Tool for Start-to-End Modeling of Next Generation Light Sources	1143
	J. Qiang, J.N. Corlett, C.E. Mitchell, C. F. Papadopoulos, G. Penn, R.D. Ryne, M. Venturini LBNL, Berkeley, California, USA
	Funding: Work supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Start-to-end simulation plays an important role in designing next generation light sources. In this paper, we present recent progress in further development and application of the parallel beam dynamics code, IMPACT, towards the fully start-to-end, multi-physics simulation of a next generation X-ray FEL light source. We will discuss numerical methods and physical models used in the simulation. We will also present some preliminary simulation results of a beam transporting through photoinjector, beam delivery system, and FEL beamlines.

TUPPP036	Large-scale Simulation of Synchrotron Radiation using a Lienard-Wiechert Approach	1689
	R.D. Ryne, C.E. Mitchell, J. Qiang LBNL, Berkeley, California, USA B.E. Carlsten, N.A. Yampolsky LANL, Los Alamos, New Mexico, USA
	Funding: DOE Office of Science, Office of Basic Energy Sciences; NNSA. Synchrotron radiation is one of the most important and difficult to model phenomena affecting lepton accelerators. Large-scale parallel modeling provides a means to explore properties of synchrotron radiation that would be impossible to study through analytical methods alone. We have performed first-principles simulations of synchrotron radiation, using a Lienard-Wiechert approach, with the same number of simulation particles as would be found in bunches with charge up to 1 nC. The results shed light on the importance of shot noise effects, the amplification of coherent synchrotron radiation due to longitudinal microbunching, the interplay of electric and magnetic forces, and the limits of the widely used one-dimensional model.

WEPPR011	Numerical Simulation Study of the Montague Resonance at the CERN Proton Synchrotron	2958
	J. Qiang, R.D. Ryne LBNL, Berkeley, California, USA G. Franchetti, I. Hofmann GSI, Darmstadt, Germany E. Métral CERN, Geneva, Switzerland
	Funding: This work partially supported by the US Department of Energy through the US LHC Accelerator Research Program (LARP) under Contract No. DE-AC02-05CH11231. The Montague resonance provides a coupling between the vertical and the horizontal dynamics of beams and can cause particle losses due to unequal aperture sizes of the accelerator. In this paper, we present a new numerical simulation study of a previous Montague resonance crossing experiment at the CERN PS including detailed three-dimensional space-charge effects and machine nonlinearity. The simulation reproduces the experimental data and suggests that the longitudinal synchrotron motion played an important role in enhancing transverse resonance coupling.

Paper

Title

Page

An Integrated Green Function Poisson Solver for Rectangular Waveguides

337

R.D. Ryne
LBNL, Berkeley, California, USA

Funding: DOE Office of Science, Office of High Energy Physics and Office of Advanced Scientific Computing Research
A new method is presented for solving Poisson's equation inside a rectangular waveguide. The method uses Fast Fourier Transforms (FFTs) to perform mixed convolutions and correlations of the charge density with an integrated Green function. Due to its similarity to the widely used Hockney algorithm for solving Poisson's equation in free space, this capability can be easily implemented in many existing particle-in-cell beam dynamics codes.

TUEPPB013

Development of an Advanced Computational Tool for Start-to-End Modeling of Next Generation Light Sources

1143

J. Qiang, J.N. Corlett, C.E. Mitchell, C. F. Papadopoulos, G. Penn, R.D. Ryne, M. Venturini
LBNL, Berkeley, California, USA

Funding: Work supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Start-to-end simulation plays an important role in designing next generation light sources. In this paper, we present recent progress in further development and application of the parallel beam dynamics code, IMPACT, towards the fully start-to-end, multi-physics simulation of a next generation X-ray FEL light source. We will discuss numerical methods and physical models used in the simulation. We will also present some preliminary simulation results of a beam transporting through photoinjector, beam delivery system, and FEL beamlines.

TUPPP036

Large-scale Simulation of Synchrotron Radiation using a Lienard-Wiechert Approach

1689

R.D. Ryne, C.E. Mitchell, J. Qiang
LBNL, Berkeley, California, USA
B.E. Carlsten, N.A. Yampolsky
LANL, Los Alamos, New Mexico, USA

Funding: DOE Office of Science, Office of Basic Energy Sciences; NNSA.
Synchrotron radiation is one of the most important and difficult to model phenomena affecting lepton accelerators. Large-scale parallel modeling provides a means to explore properties of synchrotron radiation that would be impossible to study through analytical methods alone. We have performed first-principles simulations of synchrotron radiation, using a Lienard-Wiechert approach, with the same number of simulation particles as would be found in bunches with charge up to 1 nC. The results shed light on the importance of shot noise effects, the amplification of coherent synchrotron radiation due to longitudinal microbunching, the interplay of electric and magnetic forces, and the limits of the widely used one-dimensional model.

WEPPR011

Numerical Simulation Study of the Montague Resonance at the CERN Proton Synchrotron

2958

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

Funding: This work partially supported by the US Department of Energy through the US LHC Accelerator Research Program (LARP) under Contract No. DE-AC02-05CH11231.
The Montague resonance provides a coupling between the vertical and the horizontal dynamics of beams and can cause particle losses due to unequal aperture sizes of the accelerator. In this paper, we present a new numerical simulation study of a previous Montague resonance crossing experiment at the CERN PS including detailed three-dimensional space-charge effects and machine nonlinearity. The simulation reproduces the experimental data and suggests that the longitudinal synchrotron motion played an important role in enhancing transverse resonance coupling.