PAC07 - List of Sessions

TUZBC — CONCOM: Controls & Computing (26-Jun-07 16:30—17:50)

Chair: J. A. Holmes, ORNL, Oak Ridge, Tennessee

Paper	Title	Page
TUZBC01	Towards Simulation of Electromagnetics and Beam Physics at the Petascale	889
	Z. Li V. Akcelik, A. E. Candel, L. Ge, A. C. Kabel, K. Ko, L. Lee, C.-K. Ng, E. E. Prudencio, G. L. Schussman, R. Uplenchwar, L. Xiao SLAC, Menlo Park, California
	Funding: Work supported by DOE contract DE-AC02-76SF00515. Under the support of the U. S. DOE SciDAC program, SLAC has been developing a suite of 3D parallel finite-element codes aimed at high-accuracy, high-fidelity electromagnetic and beam physics simulations for the design and optimization of next-generation particle accelerators. Running on the latest supercomputers, these codes have made great strides in advancing the state of the art in applied math and computer science at the petascale that enable the integrated modeling of electromagnetics, self-consistent Particle-In-Cell (PIC) particle dynamics as well as thermal, mechanical, and multi-physics effects. This paper will present 3D results of trapped mode calculations in an ILC cryomodule and the modeling of the ILC Sheet Beam klystron, shape determination of superconducting RF (SCRF) cavities and multipacting studies of SCRF HOM couplers, as well as 2D and preliminary 3D PIC simulation results of the LCLS RF gun.
	Slides
TUZBC02	SciDAC Frameworks and Solvers for Multi-physics Beam Dynamics Simulations	894
	J. F. Amundson D. R. Dechow Tech-X, Boulder, Colorado J. Qiang, R. D. Ryne LBNL, Berkeley, California P. Spentzouris Fermilab, Batavia, Illinois
	The need for realistic accelerator simulations is greater than ever before due to the needs of design projects such as the ILC and optimization for existing machines. Sophisticated codes utilizing large-scale parallel computing have been developed to study collective beam effects such as space charge, electron cloud, beam-beam, etc. We will describe recent advances in the solvers for these effects and plans for enhancing them in the future. To date the codes have typically applied to a single collective effect and included just enough of the single-particle dynamics to support the collective effect at hand. We describe how we are developing a framework for realistic multi-physics simulations, i.e., simulations including the state-of-the-art calculations of all relevant physical processes.
	Slides
TUZBC03	Self-Consistent Computation of Electromagnetic Fields and Phase Space Densities for Particles on Curved Planar Orbits	899
	J. A. Ellison G. Bassi, K. A. Heinemann UNM, Albuquerque, New Mexico M. Venturini LBNL, Berkeley, California R. L. Warnock SLAC, Menlo Park, California
	Funding: Supported by DOE grant DE-FG02-99ER41104 and contracts DE-AC02-05CH11231 and DE-AC02-76SF00515. We discuss our progress on integration of the coupled Vlasov-Maxwell equations in 4D. We emphasize Coherent Synchrotron Radiation from particle bunches moving on arbitrary curved planar orbits, with shielding from the vacuum chamber, but also include space charge forces. Our approach provides simulations with lower numerical noise than the macroparticle method, and will allow the study of emittance degradation and microbunching in bunch compressors. The 4D phase space density (PSD) is calculated in the beam frame with the method of local characteristics (PF). The excited fields are computed in the lab frame from a new double integral formula. Central issues are a fast evaluation of the fields and a deep understanding of the support of the 4D PSD. As intermediate steps, we have (1) developed a parallel self-consistent code using particles, where an important issue is the support of the charge density; (2) studied carefully a 2D phase space Vlasov analogue; and (3) derived an improved expression of the field of a 1D charge/current distribution which accounts for the interference of different bends and other effects usually neglected. Results for bunch compressors are presented. Self Consistent Particle Method to Study CSR Effects in Bunch Compressors, Bassi, et.al., this conference.** CSR from a 1-D Bunch on an Arbitrary Planar Orbit, Warnock, this conference.
	Slides