A5009826019- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Electromagnetic Simulation and Numerical Methods
- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Particle Detector Development and Performance
- Distributed and Parallel Computing Systems
- Photonic and Optical Devices
- Microwave Engineering and Waveguides
- Particle physics theoretical and experimental studies
- Electromagnetic Scattering and Analysis
- Advanced Data Storage Technologies
- Photonic Crystals and Applications
- Nuclear reactor physics and engineering
- Photocathodes and Microchannel Plates
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Parallel Computing and Optimization Techniques
- BIM and Construction Integration
- Electrostatic Discharge in Electronics
- Quantum Chromodynamics and Particle Interactions
- Simulation Techniques and Applications
- Spacecraft and Cryogenic Technologies
SLAC National Accelerator Laboratory
2006-2021
Universiti Malaysia Sarawak
2021
Menlo School
2002-2018
Linac Coherent Light Source
2002-2018
Pacific Northwest National Laboratory
2017
Lawrence Berkeley National Laboratory
2007
Stanford University
1993-2006
Stanford Synchrotron Radiation Lightsource
1993-2003
Brookhaven National Laboratory
2000
Turning the current experimental plasma accelerator state-of-the-art from a promising technology into mainstream scientific tools depends critically on high-performance, high-fidelity modeling of complex processes that develop over wide range space and time scales. As part U.S. Department Energy's Exascale Computing Project, team Lawrence Berkeley National Laboratory, in collaboration with teams SLAC Accelerator Laboratory Livermore is developing new simulation tool will harness power future...
WarpX is a general purpose electromagnetic particle-in-cell code that was originally designed to run on many-core CPU architectures. We describe the strategy, based AMReX library, followed allow use GPU-accelerated nodes OLCF’s Summit supercomputer, strategy we believe will extend upcoming machines Frontier and Aurora. summarize challenges encountered, lessons learned, give current performance results series of relevant benchmark problems.
The fully electromagnetic particle-in-cell code WarpX is being developed by a team of the U.S. DOE Exascale Computing Project (with additional non-U.S. collaborators on part code) to enable modeling chains tens hundreds plasma accelerator stages exascale supercomputers, for future collider designs. combining latest algorithmic advances (e.g., Lorentz boosted frame and pseudo-spectral Maxwell solvers) with mesh refinement runs computer processing unit graphical (GPU) architectures. In this...
The Public Works Department (PWD) Strategic Plan 2021-2025 outlines ambitious targets for Building Information Modelling (BIM) adoption, aiming 50% by 2021 and 80% 2025. Reflecting this trend, the Malaysian construction industry is progressively integrating BIM, which offers quantity surveyors a more reliable method, particularly developing cost estimates. However, BIM in surveying practices (QSP) has been slow, leading to limited overall use of their professional practices. Given urgent...
A search for additional evidence the rare kaon decay K+-->pi(+)nunu; has been made with a new data set comparable in sensitivity to previous exposure that produced single event. No events were found pion momentum region examined, 211<P<229 MeV/c. Including reanalysis of original set, backgrounds estimated contribute 0.08+/-0.02 events. Based on one observed event, branching ratio is B(K+-->pi(+)nunu;) = 1.5(+3.4)(-1.2)x10(-10).
An international team comprising SLAC, KEK, FNAL, JLAB and DESY is collaborating on the design, fabrication test of a low loss, 1.3 GHz 9-cell SRF structure as potential improvement for ILC main linac. The advantages this over TESLA include lower cryogenic shorter rise time, less stored energy. Among issues to be addressed in design are HOM damping, Lorentz force detuning multipacting. We will report damping calculations using parallel finite element eigenmode solver Omega3P progress made...
We report on a recent set of measurements the transverse wakefields from longitudinally tapered collimators. The were performed with low-emittance 1.19 GeV beam in SLAC linac by inserting collimator aperture into path and reconstructing vertical deflection as function position aperture. Each experiment was designed to present relatively large impedance minimize other contributions such resistivity. In addition, parameters chosen provide some insight scaling geometric wakefield collimator's...
The actual cell shapes of the TESLA cavities differ from ideal due to fabrication errors, addition stiffening rings and frequency tuning process. Cavity imperfection shifts dipole mode frequencies alters Qext's those computed for cavity. Qext increase could be problematic if its value exceeds limit required ILC beam stability. To study these effects, a cavity model was established using mesh distortion method. eigensolver Omega3P then used find critical dimensions that contribute spread...
The TTF-III power coupler adopted for the ILC baseline cavity design has shown a tendency to have long initial high processing time. A possible cause time is believed be multipacting in various regions of coupler. To understand performance limitations during processing, SLAC built flexible high-power test stand. plan individual sections coupler, which includes cold and warm coaxes, bellows, window, using stand identify problematic regions. provide insights test, detailed numerical...
A hollow-core photonic band-gap (PBG) lattice in a dielectric fiber has been proposed as high-gradient low-cost particle accelerator operating the optical regime where accelerating mode confined to defect PBG can be excited by high-power lasers [X. Lin, Phys. Rev. ST Accel. Beams 4, 051301 (2001)]. Developing efficient methods of coupling laser power into these structures requires thorough examination propagating and its near far-field radiation. In this paper, we develop simulation method...
For more than ten years, we have been working on R&D for X-band accelerator structures the JLC/NLC linear collider. Several types of Detuned (DS) and Damped Structures (DDS) successfully designed fabricated. They experimentally tested at both low power high to characterize their mechanical electrical properties. Recently started developing a new type damped detuned structure with optimized round-shaped cavities (RDDS). This paper discusses special specifications, design methods, fabrication...
Abstract The Particle-In-Cell code WarpX is being developed by a team of the U.S. DOE Exascale Computing Project to enable modeling chains tens plasma accelerators on exascale supercomputers, for future collider designs. combining latest algorithmic advances (e.g., boosted frame, pseudo-spectral Maxwell solvers) with mesh refinement and runs CPU GPU architectures. An example application up three successive muti-GeV stages presented. implementation architectures also reported.
The ever increasing demands placed upon machine performance have resulted in the need for more comprehensive particle accelerator modeling. Computer simulations are key to success of accelerators. Many aspects accelerators rely on computer modeling at some point, sometimes requiring complex simulation tools and massively parallel supercomputing. Examples include beams extreme intensities densities (toward quantum degeneracy limit), with ultra-fine control (down level individual particles)....
Under the support of U.S. DOE SciDAC program, SLAC has been developing a suite 3D parallel finite- element codes aimed at high-accuracy, high-fidelity electromagnetic and beam physics simulations for design optimization next-generation particle accelerators. Running on latest supercomputers, these have made great strides in advancing state art applied math computer science petascale that enable integrated modeling electromagnetics, self-consistent Particle-In-Cell (PIC) dynamics as well...
SLAC's Advanced Computations Department (ACD) has developed the parallel 3D electromagnetic time-domain code T3P for simulations of wakefields and transients in complex accelerator structures. is based on state-of-the-art Finite Element methods unstructured grids features unconditional stability, quadratic surface approximation up to 6 th -order vector basis functions unprecedented simulation accuracy. Optimized large-scale processing leadership supercomputing facilities, allows realistic...
Over the past years,SLAC's Advanced Computations Department (ACD) has developed 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 beam transport codes, which are based on electrostatic approximation,Pic3P includes space-charge, retardation and boundary effects as it self-consistently solves complete set Maxwell-Lorentz equations using higher-order FE methods...
In preparation for the 1997 SLC run, a novel RF bunch-length monitor has been installed in South Final Focus. The consists of ceramic gap beam pipe, 160-ft long X-band waveguide (WR90), and set dividers, tapers microwave detectors. Electromagnetic fields radiated through excite modes nearby open-ended waveguide, which transmits beam-induced signal to radiation-free shack outside beamline vault. There, combination power tapers, waveguides, crystal detectors is used measure 4 separate...