The Los Alamos Accelerator Code Group (LAACG) is a national resource for members of the accelerator community who use and/or develop software for the design and analysis of particle accelerators, beam transport systems, light sources, storage rings, and components of these systems. Below the ...
DOE Information Bridge
We have vectorized the multi-group Monte Carlo code MORSE-DD. The Monte Carlo method is very powerful to simulate the motion of particles. However the Monte Carlo codes spend much calculation time, it is required to accelerate the codes by using vector pr...
National Technical Information Service (NTIS)
Benchmark problems were prepared for evaluating the calculation codes and the nuclear data for accelerator shielding design by the Accelerator Shielding Working Group of the Research Committee on Reactor Physics in JAERI. Four benchmark problems are trans...
The effort has two broad goals, which have been prioritized by DOE, as follows: to enhance the ARGUS code for use in practical accelerator design simulations; to release ARGUS to the accelerator community through the Los Alamos Accelerator Code Group (LAA...
The Los Alamos Accelerator Code Group (LAACG) maintains the two- and three-dimensional (2-D, 3-D) MAFIA codes and the POISSON/SUPERFISH codes at the National Magnetic Fusion Energy Computer Center (NMFECC). The codes, principally electromagnetic field solvers, are used for ...
Energy Citations Database
Keywords: GPU, acceleration, Overflow code. 1. INTRODUCTION ... There have been several studies illustrating the acceleration of scientific computing codes ...
NASA Website
A novel computer code is being developed to generate system level designs of radiofrequency ion accelerators. The goal of the Accelerator System Model (ASM) code is to create a modeling and analysis tool that is easy to use, automates many of the initial design calculations, supports trade studies used in assessing ...
A characteristic method for transport calculations in two-dimensional geometries has been developed as a part of the interface-current transport code TDT. A complete description of angular and spatial approximations, as well as numerical implementation is given. A new synthetic acceleration technique has also been developed based on piecewise uniform and ...
The working group on computational accelerator physics at the 11th Advanced Accelerator Concepts Workshop held a series of meetings during the Workshop. Verification, i.e., showing that a computational application correctly solves the assumed model, and validation, i.e., showing that the model correctly describes the modeled system, ...
The Los Alamos Accelerator Theory and Simulation Group (AT-6) maintains and distributes a standard version of the Poisson-Group codes (LATTICE, AUTOMESH, TEKPLOT, POISSON, PANDIRA, MIRT, FORCE, SUPERFISH, and SF01). These codes are the product of man-decades of development under the guidance of ...
Brief descriptions are given for MAFIA and POISSON/SUPERFISH are given. MAFIA is a computer-aided analysis and design of three-dimensional electromagnetic structures including electrostatic and magnetostatic devices, radio-frequency cavities, bellows, etc. The POISSON/SUPERFISH is a group of codes used in the computer-aided design of magnets and ...
Computer simulation is an indispensable tool in assisting the design, construction, and operation of accelerators. In particular, computer simulation complements analytical theories and experimental observations in understanding beam dynamics in accelerators. The ultimate function of computer simulation is to study mechanisms that limit the performance of ...
The highlights of the working group on plasma accelerators are presented, the three main topics are (i) the beat wave accelerators, (ii) other plasma accelerators, (iii) miscellaneous work on plasma accelerators. (AIP)
PARMILA (Phase And Radial Motion in Ion Linear Accelerators) is a drift-tube linac (DTL) ion-beam dynamics code. Over its long life, many versions have developed. The Los Alamos Accelerator Code Group distributes a version, for which a manual is available. Unless otherwise specified, all ...
A novel computer code is being developed to generate system level designs of radiofrequency ion accelerators with specific applications to machines of interest to Accelerator Driven Transmutation Technologies (ADTT). The goal of the Accelerator System Model (ASM) code is to create a modeling ...
The operation of the accelerator driven reactor with subcritical condition provides a more flexible choice of the reactor materials and of design parameters. A deep subcriticality is chosen sometime from the analysis of point kinetics. When a large reactor is operated in deep subcritical condition by using a localized spallation source, the power distribution has strong ...
A novel approach is proposed for charged particle transport calculations using a recently developed second-order, self-adjoint angular flux (SAAF) form of the Boltzmann transport equation with continuous slowing-down. A finite element discretization that is linear continuous in space and linear discontinuous (LD) in energy is described and implemented in a one-dimensional, planar geometry, ...
Group 1: Electron Acceleration and Propagation. Group Leader: ... for electron propagation and acceleration; Observational and theoretical constraints on ...
The wakefield accelerator concept consists of utilizing the electric field generated by the motion of one group of particles to accelerate another group of particles. Essentially, the wakefield accelerator is a transformer which transfers the energy in a ...
Accelerator Driven Systems (ADS) present one of the most viable solutions for transmutation and effective utilization of nuclear fuel. Spent fuel from reactors will be partitioned to separate plutonium and other minor actinides to be transmuted in the ADS. Without the ADS, minor actinides must be stored at a geologic repository for long periods of time. One problem with ADS is ...
NASA Astrophysics Data System (ADS)
The shape of an rf pulse is distorted due to dispersion encountered in acceleration through traveling-wave linear accelerator structures. Simulations are made to ascertain the severity of this distortion in cavities designed to operate at various group velocities. The pulse suffers maximum degradation when propagated through ...
The compression and acceleration of an external electron bunch into the laser wakefield is studied using 3D modeling with the LAPLAC code and compared to analytical predictions. It is shown, for a laser propagating in a plasma channel, that the nonlinear laser pulse dynamics together with the finite laser spot size influence the electron bunch compression ...
... Accession Number : ADA223954. Title : Transform Coding and Differential Pulse Code Modulation for Group 4 Facsimile. ...
DTIC Science & Technology
The desirable features of an ion beam extraction and acceleration modeling code are outlined, and features of the BEAM (Beam Extraction and Acceleration Modeling) code are described. Examples of typical calculations are given and plans for future development are presented. 16 refs.
, the wave-induced mean flow for internal waves is larger than the horizontal group velocity, cgx, even. While running, the code systematically computes the in- stantaneous vertical profiles of the mean of the stability of the wavepacket to self-acceleration, these are compared with the horizontal group velocity
E-print Network
The MCNP code is written and maintained by Group X-TM at Los Alamos National Laboratory. In response to the demands of the accelerator community, the authors have undertaken a major effort to expand the capabilities of MCNP to increase the set of transportable particles; to make use of newly evaluated high-energy nuclear data tables ...
... Consider the following chunk of code: 13 ... The content addressable memory accelerates searches involving boolean patterns while the function ...
May 7, 2008 ... The code shown in brackets { } at the beginning of each section indicates which environment, or acceleration regime, is applicable to the ...
We developed a code for accelerator modeling which will allow users to create and analyze accelerators through a graphical user interface (GUI). The GUI can read an accelerator from files or create it by adding, removing and changing elements. It also creates 4D orbits and lifetime plots. The ...
Sep 3, 2009 ... The use of a GPU to accelerate the code is considered here. Here is a short paper (PDF), and here are slides from a talk (PDF). ...
Contents: Groups and fields; Group codes and vector spaces; Cyclic codes; Burst error correcting codes; Peterson's decoding rule for binary Bose-Chaudhuri codes; Coding theorems of information theory; Implementation of error-correcting ...
The linac codes group discussed two main topics: the PARMTEQ codes and their environment and limitations of the linac simulation codes. These topics are contained in this paper. 7 refs.
In this paper, we present a detailed analysis of the modes of a dielectric-loaded rectangular waveguide accelerating structure. In general, the acceleration field in a synchronous acceleration mode is non-uniform in the two transverse dimensions. However, we could use an array of these structures rotated alternatively by 90 degrees to ...
Highlights of major projects in the Accelerator Technology Division of the Los Alamos National Laboratory are presented. The first section deals with the Fusion Materials Irradiation Test Facility's 2-MeV accelerator on which tests began in May, as scheduled. Then, activities are reported on beam dynamics, inertial fusion, structure development, the ...
The Accident Response Group (ARG) at the Los Alamos National Laboratory has established specific design criteria for two vans that will be used to transport personnel and massive equipment across various types of terrain. The vans must be capable of meeting survivability requirements when subjected to acceleration loads of 10 to 20 g's in ...
The cw CCL being designed for the Accelerator Production of Tritium (APT) project accelerates protons from 96 MeV to 211 MeV. It consists of 99 segments each containing up to seven accelerating cavities. Segments are coupled by intersegment coupling cavities and grouped into supermodules. The design method needs to ...
ARGUS is a three-dimensional, electromagnetic, particle-in-cell (PIC) simulation code that is being distributed to U.S. accelerator laboratories in collaboration between Science Applications International Corporation (SAIC[sup TM]) and the Los Alamos Accelerator Code Group (LAACG). It uses a ...
ARGUS is a three-dimensional, electromagnetic, particle-in-cell (PIC) simulation code that is being distributed to U.S. accelerator laboratories in collaboration between SAIC and the Los Alamos Accelerator Code Group. It uses a modular architecture that allows multiple physics modules to share ...
Before parallelizing a code, a programmer should optimize his code for single CPU execution. Many optimization techniques can accelerate performance in ...
of Advanced Accelerator Concepts. Student poster award winners: Working Group 1: Laser-plasma accelerators Poster winner: Jens Osterhoff, MPQ Working Group 2: Computation Poster...
Science.gov Websites
A summary is given of the activities of those in the Media Accelerator Group. Attention was focused on the Inverse Cherenkov Accelerator, the Laser Focus Accelerator, and the Beat Wave Accelerator. For each of these the ultimate capability of the concept was examined as well as the next series ...
The MCNP code is written and maintained by Group X-TM at Los Alamos National Laboratory. In response to a variety of needs, and particularly in support of the Accelerator Production of Tritium (APT) program, the authors have recently undertaken a major effort to expand the capabilities of MCNP to increase the set of transportable ...
In this paper, we first review the magnets needed in accelerators, then discuss computations for accelerator magnets performed with present codes, and finally describe a new volume integral code which shows promise, and should be suitable for parallel computation. 9 refs., 10 figs.
Accelerator injector designs have been evaluated using two computer codes. The first code self consistently follows relativistic particles in two dimensions. Fields are obtained in the Darwin model which includes inductive effects. This code is used to study cathode emission and acceleration to ...
The Experimental Physics and Industrial Control System (EPICS) collaboration now consists of many accelerator, astronomy and particle detector projects. Many of these groups contribute code to the collaboration. The interest of the sponsoring laboratory is always the primary driver in decisions about developing new ...
The time dependent spectrum of neutrons in the water-moderated Oak Ridge Electron Linear Accelerator (ORELA) target has been calculated using a modified version of the MORSE multi-group Monte Carlo code with an analytic hydrogen scattering model. Distribu...
The coarse-mesh rebalance method, based on neutron conservation, is used in discrete ordinates neutron transport codes to accelerate convergence of the within-group scattering source. Though very powerful for this application, the method is ineffective in...
The working group on computation addressed three physics areas: (i) plasma-based accelerators (laser-driven and beam-driven), (ii) high gradient structure-based accelerators, and (iii) electron beam sources and transport [1]. Highlights of the talks in these areas included new models of breakdown on the microscopic scale, new ...
TDD, or in any methodology that combines testing during development. Index Terms--Development Tools. We believe that such tools are an important step forward towards accelerating TDD retesting software tools. The CodePsychologist, which was previously developed in our group [25], is a tool which
In the paper the results are presented for calculation of the transverse wake and RF kick from the power and HOM couplers of the ILC acceleration structure. The RF kick was calculated stand-alone by HFSS, CST MWS and COMSOL codes while the wake kick was calculated by GdfidL. The calculation precision and convergence for both cases are discussed and ...
Presented here is the first part of a study to implement convergence acceleration techniques based on the multigrid concept in the Proteus computer code. A review is given of previous studies on the implementation of multigrid methods in computer codes fo...
In the framework of the CARE HHH European Network, we have developed a web-based dynamic accelerator-physics code repository. We describe the design, structure and contents of this repository, illustrate its usage, and discuss our future plans, with emphasis on code benchmarking.
This paper is a result of a group of simulations used to determine the optimal parameters for a pulsed power electron gun. As electrostatic codes such as PBGUNS tend to be cheaper, easier to use, and have less stringent computational requirements than time dependent codes such as MAFIA, it was desirable to determine those regimes in ...
The approach used to calculate the two-electron integral by many electronic structure packages including generalized atomic and molecular electronic structure system-UK has been designed for CPU-based compute units. We redesigned the two-electron compute algorithm for acceleration on a graphical processing unit (GPU). We report the acceleration strategy ...
PubMed
The two-dimensional quasistatic simulation code WAKE [P. Mora and T. Antonsen, Phys. Plasmas 4, 217 (1997)] used to model laser pulse propagation in tenuous plasma is modified to describe the dynamics of energetic particles. In the original code, all particles were assumed to satisfy the quasistatic approximation, which assumes that the driver and its ...
Acceleration is a significant feature of game-deciding situations in the various codes of football. However little is known about the acceleration characteristics of football players, the effects of acceleration training, or the effectiveness of different training modalities. This study examined the effects of ...
A novel computer code is being developed to generate system level designs of radiofrequency ion accelerators with specific applications to machines of interest to Accelerator Driven Transmutation Technologies (ADTT). The goal of the Accelerator System Mod...
A major obstacle to collaboration on accelerator projects has been the sharing of lattice description files between modeling codes. To address this problem, a lattice description format called Accelerator Markup Language (AML) has been created. AML is bas...
The development of a three dimensional code calculating the electron beam trajectory in accelerating structure is reported. An electron plasma wave excited to a known amplitude is supposed and the electron acceleration in the field of this wave is analyti...
This paper contains a listing of more than 150 programs that have been used in the design and analysis of accelerators. Given on each citation are person to contact, classification of the computer code, publications describing the code, computer and language runned on, and a short description of the code. ...
Computer codes, which transform a number of pseudoparticles through a simulated machine, form the backbone of accelerator design techniques. When minimization of beam loss within the machine is a primary design objective, it becomes necessary to consider beam behavior in detail, and questions of both the physics and computational aspects of the simulation ...
... PULSE CODE MODULATION Qz FOR GROUP 4 FACSIMILE DTIC ... 4), in which Differential Pulse Code Modulation (DPCM) and ...
This paper reviews the basic characteristics of free-electron laser (FEL) oscillators, and describes a group of codes that have been developed to analyze and design rf-linac-driven FELs. The optical performance of an FEL has been treated using 1-D time-dependent (finite pulse) codes that describe the characteristics of the optical ...
First, some general properties of codes which are invariant under the permutation groups were given. For these codes an interesting relation is given between the minimum weights of dual codes. Secondly, results on minimum weights in BCH codes are presente...
We have developed a multi-group Monte Carlo neutron transport code using C++ and the Parallel Object-Oriented Methods and Applications (POOMA) class library. This transport code, called MC++, currently computes k and {alpha}-eigenvalues and is portable to and runs parallel on a wide variety of platforms, including MPPs, clustered SMPs, ...
Research is reported for the combined groups consisting of the Accelerator Division and the Magnetic Fusion Energy Group. Major topics reported include accelerator operations, magnetic fusion energy, and advanced accelerator development. (GHT)
...2010-10-01 false Classification codes and compatibility groups of explosives...Class 1 § 173.52 Classification codes and compatibility groups of explosives. (a) The classification code for an explosive, which is...
Code of Federal Regulations, 2010
... M. Haftel - Code 4665 Dr. S. Ossakow - Code 4700 (26 copies) Dr. V. Patel - Code 4701 Dr. A. Robson - Code 4708 Dr ... Dr. James W.-K. Mark, L-477 ...
A new code to calculate the effects of intrabeam scattering (IBS) has been developed in MATLAB based on the approximation suggested by K. Bane. It interfaces with the Accelerator Toolbox but can also read in lattice functions from other codes. The code ha...
TWODANT solves the two-dimensional multigroup transport equation in x-y, r-z, and r-theta geometries. Both regular and adjoint, inhomogeneous (fixed source and homogeneous (k-effective and eigenvalue search)) problems subject to vacuum, reflective, periodic, white, or inhomogeneous boundary flux conditions are solved. General anisotropic scattering is allowed and anisotropic inhomogeneous sources ...
Sandia National Laboratories (SNL) designs, tests and operates a variety of accelerators that generate large amounts of high energy Bremsstrahlung radiation over an extended time. Typically, groups of similar accelerators are housed in a large building that is inaccessible to the general public. To facilitate independent operation of ...
This report presents highlights of major projects in the Accelerator Technology Division of the Los Alamos National Laboratory. The first section deals with the Fusion Materials Irradiation Test Facility's 2-MeV accelerator on which tests began in May, as scheduled. Then, activities are reported on beam dynamics, inertial fusion, structure ...
... Accession Number : ADA153583. Title : Further Studies of the NRL Collective Particle Accelerator VIA Numerical Modeling with the MAGIC Code. ...
HALT Highly Accelerated Life Test. HAST Highly Accelerated Stress Testing. HBT Heterojunction Bipolar Transistor. RT Room Temperature ...
NODEX is a multigroup nodal diffusion theory code for general three-dimensional reactor analysis. The nodal solution procedure used in the code is based on a high order version of the Nodal Expansion Method (NEM). This transverse integrated nodal method is capable of obtaining extremely accurate solutions to the node-wise homogeneous diffusion equation on ...
Electron cloud instabilities have been observed in many circular accelerators around the world and raised concerns of future accelerators and possible upgrades. In this thesis, the electron cloud instabilities are studied with the quasi-static particle-in-cell (PIC) code QuickPIC. Modeling in three-dimensions the long timescale ...
In this paper we will review recent activities in the area of code development as it affects the accelerator community. We will first discuss the changing computing environment. We will review how the computing environment has changed in the last 10 years, with emphasis on computing power, operating systems, computer languages, graphics standards, and ...
A summary is given on the work presented and discussed in the Laser-Plasma Acceleration Working Group at the 2004 Advanced Accelerator Concepts Workshop, including the Plasma Acceleration Subgroup (Group-Leader: Eric Esarey; Co-Group-Leader: Sergei Tochitsky) and the Plasma ...
The evolution of the spin during acceleration in the Relativistic Heavy Ion Collider (RHIC) has been studied with a new numerical code, Spink. Results of spin tracking through resonances are shown.
The paper presents a brief description of the models incorporated in PHITS and the present status of the code, showing some benchmarking tests of the PHITS code for accelerator facilities and space radiation.
A prototype gamma-ray telescope employing the coded aperture mask technique has been constructed and
NASA Technical Reports Server (NTRS)
This special issue on laser and plasma accelerators illustrates the rapid advancement and diverse applications of laser and plasma accelerators. Plasma is an attractive medium for particle acceleration because of the high electric field it can sustain, with studies of acceleration processes remaining one of the ...
This paper describes the physics design of a 100 keV, 60 A H(-) accelerator for the diagnostic neutral beam (DNB) for international tokamak experimental reactor (ITER). The accelerator is a three grid system comprising of 1280 apertures, grouped in 16 groups with 80 apertures per beam group. ...
This paper describes the physics design of a 100 keV, 60 A H- accelerator for the diagnostic neutral beam (DNB) for international tokamak experimental reactor (ITER). The accelerator is a three grid system comprising of 1280 apertures, grouped in 16 groups with 80 apertures per beam group. ...
A new neutron transport code for time-dependent analyses of nuclear systems has been developed. The code DORT-TD is based on the well-known Discrete Ordinates code DORT, which solves the steady-state neutron transport equation in two dimensions for an arbitrary number of energy groups and standard regular ...
Comparisons made by the Large Core Code Evaluation Working Group (LCCEWG) show that excellent agreement is obtained by different diffusion theory codes run on different computers at different installations in computing representative models of large fast reactors. It is noted that finite difference diffusion theory computer ...
Science Accelerator Share | E-mail | RSS Archive | RSS | Widget Featured Search: geothermal | Featured Search Archive Widget Inclusion Code You may download and install the Science...
RACETRACK is a computer code to simulate transverse nonlinear particle motion in accelerators. Transverse magnetic fields of higher order are treated in thin magnet approximation. Multipoles up to 20 poles are included. Energy oscillations due to the nonl...
A computer simulation code at the Lawrence Livermore National Laboratory (LLNL) to predict the performance of a railgun electromagnetic accelerator has been developed and validated. The code, called MAGRAC (MAGnetic Railgun ACcelerator), models the perfor...
A computer simulation code has been developed and validated at the Lawrence Livermore National Laboratory (LLNL) to predict the performance of a railgun electromagnetic accelerator. The code, called MAGRAC (MAGnetic Railgun ACcelerator), models the perfor...
This report presents the results of a study to implement convergence acceleration techniques based on the multigrid concept in the two-dimensional and three-dimensional versions of the Proteus computer code. The first section presents a review of the rele...
A description of the computer code AKZEPTANZ is given. Using this code the first-order acceptance areas of the Rossendorf EGP-10-1 tandem accelerator have been calculated. At an injection energy of 23 keV they are practically independent of the terminal v...
In the framework of the CARE HHH European Network, we have developed a web-based dynamic accelerator-physics code repository. We describe the design, structure and contents of this repository, illustrate its usage, and discuss our future plans, with empha...
