Design and optimization of large accelerator systems through high-fidelity electromagnetic simulations

Abstract

SciDAC1, with its support for the "Advanced Computing for 21 st Century Accelerator Science and Technology" (AST) project, witnessed dramatic advances in electromagnetic (EM) simulations for the design and optimization of important accelerators across the Office of Science. In SciDAC2, EM simulations continue to play an important role in the "Community Petascale Project for Accelerator Science and Simulation" (ComPASS), through close collaborations with SciDAC CETs/Institutes in computational science. Existing codes will be improved and new multi-physics tools will be developed to model large accelerator systems with unprecedented realism and high accuracy using computing resources at petascale. These tools aim at targeting the most challenging problems facing the ComPASS project. Supported by advances in computational science research, they have been successfully applied to the International Linear Collider (ILC) and the Large Hadron Collider (LHC) in High Energy Physics (HEP), the JLab 12-GeV Upgrade in Nuclear Physics (NP), as well as the Spallation Neutron Source (SNS) and the Linac Coherent Light Source (LCLS) in Basic Energy Sciences (BES).

3D multiphysics modeling of superconducting cavities with a massively parallel simulation suite

“…The parallel finite-element multiphysics simulation suite ACE3P also allows for the rf, mechanical and thermal studies of more complex models, for instance, a string of cavities in a cryomodule [42][43][44]. In this case, special attention should be paid to the mesh as well as to the simulation settings that depend on the particular problem size and the amount of memory available per a computing node.…”

New Developments in the Simulation of Advanced Accelerator Concepts

“…'s 1 and 2 below. We consider the very challenging case of a 10 GeV quasilinear stage for an externally injected electron bunch, including a 2 m plasma density channel with central electron density n e =6x10 16 cm -3 and a laser pulse with =0.8 m and the following dimensionless parameters: a 0 =1, k p w 0 =3.8 and k p L=2 (see e.g. Ref.…”

“…The Advanced Computation department has also developed software, called TEM3P for modeling thermal effects [15,16] on rf cavities. Pic3P has been shown to agree well with PARMELA for a case where both are valid (low current) and to agree with MAFIA for higher-currents (in disagreement with PARMELA), and to run much faster than MAFIA.…”

Community petascale project for accelerator science and simulation: advancing computational science for future accelerators and accelerator technologies

“…These utilities are used with the 3P family of codes described above. Detailed descriptions of the ComPASS codes and their applications can be found in [10] for electromagnetics [11] for advanced acceleration and [12] for beam dynamics. The high-performancecomputing (HPC) capabilities of most of these codes were developed under the AST SciDAC project, each targeting specific areas of computational accelerator physics applications, with emphasis on the performance and high fidelity of the calculation.…”

“…For the RHIC II proposal, the e-RHIC concept design, the CEBAF upgrade proposal and the ELIC concept design, we focus on three areas: (1) electromagnetic simulation of superconducting rf cavities, with and without self-consistent beam treatment, (2) multiphysics beam dynamics simulations with emphasis on nonlinearities, beam-beam effects, and intrabeam scattering, and (3) electron cooling physics, aiming to quantitatively understand the dynamical friction force on ions moving through electron distributions in the presence of strong external fields. In the area of accelerator based x-ray light sources ComPASS tools are applied to help understand and predict limits on beam brightness, coherent and incoherent undulator radiation, emittance preservation, and microbunching [10,12]. In addition, ComPASS is assisting the development of advanced accelerator concepts [11].…”