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Dive into the research topics where A. Kabel is active.

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Featured researches published by A. Kabel.


ieee particle accelerator conference | 2007

Towards simulation of electromagnetics and beam physics at the petascale

Z. Li; V. Akcelik; A. Candel; S. Chen; L. Ge; A. Kabel; L. Lee; Cho-Kuen Ng; E. Prudencio; G. Schussman; R. Uplenchwar; Liling Xiao; K. Ko

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 PIC simulation results of the LCLS RF gun.


ieee particle accelerator conference | 2007

Modeling imperfection effects on dipole modes in TESLA cavity

Liling Xiao; C. Adolphsen; V. Akcelik; A. Kabel; K. Ko; L. Lee; Z. Li; Cho-Kuen Ng

The actual cell shapes of the TESLA cavities differ from the ideal due to fabrication errors, the addition of stiffening rings and the frequency tuning process. Cavity imperfection shifts the dipole mode frequencies and alters the Qexts from those computed for the ideal cavity. Qext increase could be problematic if its value exceeds the limit required for ILC beam stability. To study these effects, a cavity imperfection model was established using a mesh distortion method. The eigensolver Omega3P was then used to find the critical dimensions that contribute to the Qext spread and frequency shift by comparing predictions to TESLA cavity measurement data. Using the imperfection parameters obtained from these studies, fiducial cavity imperfection models are generated for the studies of wake fields.


Journal Name: Submitted to Journal of Physics: Conference Series; Conference: Invited talk at SCIDAC 2009: Scientific discovery through advanced computing program, San Diego, California, 14-18 Jun 2009 | 2009

State of the art in electromagnetic modeling for the Compact Linear Collider

Arno Candel; A. Kabel; Lie-Quan Lee; Zenghai Li; Cho Ng; Greg Schussman; Kwok Ko

SLACs Advanced Computations Department (ACD) has developed the parallel 3D electromagnetic time-domain code T3P for simulations of wakefields and transients in complex accelerator structures. T3P is based on state-of-the-art Finite Element methods on unstructured grids and features unconditional stability, quadratic surface approximation and up to 6 th -order vector basis functions for unprecedented simulation accuracy. Optimized for large-scale parallel processing on leadership supercomputing facilities, T3P allows simulations of realistic 3D structures with fast turn-around times, aiding the design of the next generation of accelerator facilities. Applications include simulations of the proposed two-beam accelerator structures for the Compact Linear Collider (CLIC) - wakefield damping in the Power Extraction and Transfer Structure (PETS) and power transfer to the main beam accelerating structures are investigated.


ieee particle accelerator conference | 2007

Parallel finite element particle-in-cell code for simulations of space-charge dominated beam-cavity interactions

A. Candel; A. Kabel; L. Lee; Z. Li; C. Limborg; Cho-Kuen Ng; E. Prudencio; G. Schussman; R. Uplenchwar; K. Ko

Over the past years,SLACs Advanced Computations Department (ACD) has developed the parallel finite element (FE) particle-in-cell code Pic3P (Pic2P) for simulations of beam-cavity interactions dominated by space- charge effects. As opposed to standard space-charge dominated beam transport codes, which are based on the electrostatic approximation,Pic3P (Pic2P) includes space-charge, retardation and boundary effects as it self-consistently solves the complete set of Maxwell-Lorentz equations using higher-order FE methods on conformal meshes. Use of efficient, large-scale parallel processing allows for the modeling of photoinjectors with unprecedented accuracy, aiding the design and operation of the next-generation of accelerator facilities. Applications to the Linac Coherent Light Source (LCLS) RF gun are presented.


Contributed to SCIDAC 2008: SCIENTIFIC DISCOVERY THROUGH ADVANCED COMPUTING, Seattle, Washington, 13-17 July 2008 | 2008

Computational science research in support of petascale electromagnetic modeling

Lie-Quan Lee; Volkan Akcelik; Lixin Ge; Sheng Chen; G. Schussman; Arno Candel; Zenghai Li; Liling Xiao; A. Kabel; Ravindra Uplenchwar; Cho-Kuen Ng; Kwok Ko

Computational science research components were vital parts of the SciDAC-1 accelerator project and are continuing to play a critical role in newly-funded SciDAC-2 accelerator project, the Community Petascale Project for Accelerator Science and Simulation (ComPASS). Recent advances and achievements in the area of computational science research in support of petascale electromagnetic modeling for accelerator design analysis are presented, which include shape determination of superconducting RF cavities, mesh-based multilevel preconditioner in solving highly-indefinite linear systems, moving window using h- or p- refinement for time-domain short-range wakefield calculations, and improved scalable application I/O.


PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) | 2001

Coherent synchrotron radiation calculations using TraFiC/sup 4/: multi-processor simulations and optics scans

A. Kabel

Coherent synchrotron radiation (CSR) is one of the most important effects in the design of high-quality beamlines with small bending radii. For a wide class of problems, numerical simulation is the only method to predict its effects. TraFiC/sup 4/ is one of several simulation codes in existence. In this paper, we describe its extension to multi-processor machines, resulting in a substantial saving of CPU time. Also, we describe a semi-analytical approach to the problem of optics-dependence of emittance growth due to CSR.


SPIN PHYSICS: 18th International Spin Physics Symposium | 2009

High‐Fidelity RF Gun Simulations with the Parallel 3D Finite Element Particle‐In‐Cell Code Pic3P

Arno Candel; A. Kabel; Lie-Quan Lee; Zenghai Li; C. Limborg; Cho Ng; Greg Schussman; Kwok Ko

SLAC’s Advanced Computations Department (ACD) has developed the first parallel Finite Element 3D Particle‐In‐Cell (PIC) code, Pic3P, for simulations of RF guns and other spacecharge dominated beam‐cavity interactions. Pic3P solves the complete set of Maxwell‐Lorentz equations and thus includes space charge, retardation and wakefield effects from first principles. Pic3P uses higher‐order Finite Element methods on unstructured conformal meshes. A novel scheme for causal adaptive refinement and dynamic load balancing enable unprecedented simulation accuracy, aiding the design and operation of the next generation of accelerator facilities. Application to the Linac Coherent Light Source (LCLS) RF gun is presented.


bipolar/bicmos circuits and technology meeting | 2003

Maxwell-Lorentz equations in general Frenet-Serret coordinates

A. Kabel

We consider the trajectory of a charged particle in an arbitrary external magnetic field. A local orthogonal coordinate system is given by the tangential, curvature, and torsion vectors. We write down Maxwells equations in this coordinate system. The resulting partial differential equations for the magnetic fields fix conditions among its local multipole components, which can be viewed as a generalization of the usual multipole expansion of the fields of magnetic elements.


bipolar/bicmos circuits and technology meeting | 2003

Parallel simulation algorithms for the three-dimensional strong-strong beam-beam interaction

A. Kabel

The strong-strong beam-beam effect is one of the most important effects limiting the luminosity of ring colliders. Little is known about it analytically, so most studies utilize numeric simulations. The two-dimensional realm is readily accessible to workstation-class computers (cf.,e.g.,[1, 2]), while three dimensions, which add effects such as phase averaging and the hourglass effect, require vastly higher amounts of CPU time. Thus, parallelization of three-dimensional simulation techniques is imperative; in the following we discuss parallelization strategies and describe the algorithms used in our simulation code, which will reach almost linear scaling of performance vs. number of CPUs for typical setups.


bipolar/bicmos circuits and technology meeting | 2003

Particle tracking and bunch population in TraFiC/sup 4/ 2.0

A. Kabel

Coherent Synchrotron Radiation (CSR) plays an important role in the design of accelerator components with high peak currents and small bending radii, such as magnetic bunch compressors, wigglers, and compact storage rings. The code TraFiC4 has been developed to design such elements[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12] ; it simulates CSR effects from first principles. We present a re-write of the tracking and user interface components of TraFiC 4 . Extensions and corrections include: expanded input language; generalized bunch populations (rectangular, Gaussian, user-specified function); new element types; truly three-dimensional dynamics (i. e., the restriction to a single plane of motion has been abandoned), vastly expanded documentation; documented C++ class interface; and improved dynamic load-balancing for parallel computers.

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Cho Ng

Stanford University

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K. Ko

Stanford University

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