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Performance of particle in cell methods on highly concurrent computational architectures
Particle in cell (PIC) methods are effective in computing Vlasov-Poisson system of equations used in simulations of magnetic fusion plasmas. PIC methods use grid based computations, for solving Poisson’s equation or more generally Maxwell’s equations, as well as Monte-Carlo type methods to sample the Vlasov equation. The presence of two types of discretizations, deterministic field solves and Monte-Carlo methods for the Vlasov equation, pose challenges in understanding and optimizing performance on today large scale computers which require high levels of concurrency. These challenges arises from the need to optimize two very different types of processes and the interactions between them. Modern cache based high-end computers have very deep memory hierarchies and high degrees of concurrency which must be utilized effectively to achieve good performance. The effective use of these machines requires maximizing concurrency by eliminating serial or redundant work and minimizing global communication. A related issue is minimizing the memory traffic between levels of the memory hierarchy because performance is often limited by the bandwidths and latencies of the memory system. This paper discusses some of the performance issues, particularly in regard to parallelism, of PIC methods. The gyrokinetic toroidal code (GTC) is used for these studies and a new …
Date:
September 23, 2009
Creator:
Adams, M. F.; Ethier, S. & Wichmann, N.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Marion Adams, April 10, 2009
The National Museum of the Pacific War presents an interview with Marion Adams. Adams was drafted into the Army in July of 1941. He served in the 43rd Engineer Construction Battalion, building roads, hospitals and kitchens. In 1942 he traveled to Australia, where he helped build three airstrips. They traveled to Oro Bay, Papua New Guinea, building railroads and airstrips. Adams was also trained as a medic, serving in the First Aid station. He provides details of both work experiences in engineering and building and assisting the sick and injured. He recalls helping the many wounded in Manila, as well as delivering supplies to the prison camps. He was discharged in June of 1945.
Date:
April 10, 2009
Creator:
Adams, Marion
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Marion Adams, April 10, 2009
The National Museum of the Pacific War presents an interview with Marion Adams. Adams was drafted into the Army in July of 1941. He served in the 43rd Engineer Construction Battalion, building roads, hospitals and kitchens. In 1942 he traveled to Australia, where he helped build three airstrips. They traveled to Oro Bay, Papua New Guinea, building railroads and airstrips. Adams was also trained as a medic, serving in the First Aid station. He provides details of both work experiences in engineering and building and assisting the sick and injured. He recalls helping the many wounded in Manila, as well as delivering supplies to the prison camps. He was discharged in June of 1945.
Date:
April 10, 2009
Creator:
Adams, Marion
Object Type:
Text
System:
The Portal to Texas History
Scaling to 150K cores: recent algorithm and performance engineering developments enabling XGC1 to run at scale
Particle-in-cell (PIC) methods have proven to be eft#11;ective in discretizing the Vlasov-Maxwell system of equations describing the core of toroidal burning plasmas for many decades. Recent physical understanding of the importance of edge physics for stability and transport in tokamaks has lead to development of the fi#12;rst fully toroidal edge PIC code - XGC1. The edge region poses special problems in meshing for PIC methods due to the lack of closed flux surfaces, which makes fi#12;eld-line following meshes and coordinate systems problematic. We present a solution to this problem with a semi-#12;field line following mesh method in a cylindrical coordinate system. Additionally, modern supercomputers require highly concurrent algorithms and implementations, with all levels of the memory hierarchy being effe#14;ciently utilized to realize optimal code performance. This paper presents a mesh and particle partitioning method, suitable to our meshing strategy, for use on highly concurrent cache-based computing platforms.
Date:
October 1, 2009
Creator:
Adams, Mark F.; Ku, Seung-Hoe; Worley, Patrick; D'Azevedo, Ed; Cummings, Julian C. & Chang, C. S.
Object Type:
Article
System:
The UNT Digital Library
Weatherization Assistance Program Technical Assistance Center
The following is a synopsis of the major achievements attributed to the operation of the Weatherization Assistance Program Technical Assistance Center (WAPTAC) by the National Association for State Community Services Programs (NASCSP). During the past five years, the WAPTAC has developed into the premier source for information related to operating the Weatherization Assistance Program (WAP) at the state and local levels. The services provide through WAPTAC include both virtual technical support as well as hands-on training and instruction in classroom and in the field. The WAPTAC achieved several important milestones during its operation including the establishment of a national Weatherization Day now celebrated in most states, the implementation of a comprehensive Public Information Campaign (PIC) to raise the awareness of the Program among policy makers and the public, the training of more than 150 new state managers and staff as they assume their duties in state offices around the country, and the creation and support of a major virtual information source on the Internet being accessed by thousands of staff each month. The Weatherization Assistance Program Technical Assistance Center serves the Department of Energy's (DOE) Office of Weatherization and Intergovernmental Program as a valuable training and technical assistance resource for …
Date:
January 7, 2009
Creator:
Adams, Robert
Object Type:
Report
System:
The UNT Digital Library
Searches for Charginos and Neutralinos with the D0 Detector
Within the framework of supersymmetry, charginos and/or neutralinos are often the preferred topics of searches for experimental evidence. This is due to the facts that in much of parameter space they are the lightest supersymmetric partners and they offer unique final states to separate from standard model backgrounds. The D0 experiment has performed several recent searches including the traditional trilepton final state and a decay chain involving dark photons.
Date:
October 1, 2009
Creator:
Adams, T.
Object Type:
Article
System:
The UNT Digital Library
Renaissance of the ~1 TeV Fixed-Target Program
This document describes the physics potential of a new fixed-target program based on a {approx} TeV proton source. Two proton sources are potentially available in the future: the existing Tevatron at Fermilab, which can provide 800 GeV protons for fixed-target physics, and a possible upgrade to the SPS at CERN, called SPS+, which would produce 1 TeV protons on target. In this paper we use an example Tevatron fixed-target program to illustrate the high discovery potential possible in the charm and neutrino sectors. We highlight examples which are either unique to the program or difficult to accomplish at other venues.
Date:
May 1, 2009
Creator:
Adams, T.; Appel, Jeffrey A.; Arms, Kregg Elliott; Balantekin, A. B.; Conrad, Janet Marie; Cooper, Peter S. et al.
Object Type:
Article
System:
The UNT Digital Library
Expression of Interest for Neutrinos Scattering on Glass: NuSOnG
We propose a 3500 ton (3000 ton fiducial volume) SiO{sub 2} neutrino detector with sampling calorimetry, charged particle tracking, and muon spectrometers to run in a Tevatron Fixed Target Program. Improvements to the Fermilab accelerator complex should allow substantial increases in the neutrino flux over the previous NuTeV quad triplet beamline. With 4 x 10{sup 19} protons on target/year, a 5 year run would achieve event statistics more than 100 times higher than NuTeV. With 100 times the statistics of previous high energy neutrino experiments, the purely weak processes {nu}{sub {mu}} + e{sup -} {yields} {nu}{sub {mu}} + e{sup -} and {nu}{sub {mu}} + e{sup -} {yields} {nu}{sub e} + {mu}{sup -} (inverse muon decay) can be measured with high accuracy for the first time. The inverse muon decay process is independent of strong interaction effects and can be used to significantly improve the flux normalization for all other processes. The high neutrino and antineutrino fluxes also make new searches for lepton flavor violation and neutral heavy leptons possible. In this document, we give a first look at the physics opportunities, detector and beam design, and calibration procedures.
Date:
July 1, 2009
Creator:
Adams, T.; Bugel, L.; Conrad, J. M.; Fisher, P. H.; Formaggio, J. A.; de Gouvea, A. et al.
Object Type:
Article
System:
The UNT Digital Library
QCD Precision Measurements and Structure Function Extraction at a High Statistics, High Energy Neutrino Scattering Experiment: NuSOnG
We extend the physics case for a new high-energy, ultra-high statistics neutrino scattering experiment, NuSOnG (Neutrino Scattering On Glass) to address a variety of issues including precision QCD measurements, extraction of structure functions, and the derived Parton Distribution Functions (PDFs). This experiment uses a Tevatron-based neutrino beam to obtain a sample of Deep Inelastic Scattering (DIS) events which is over two orders of magnitude larger than past samples. We outline an innovative method for fitting the structure functions using a parameterized energy shift which yields reduced systematic uncertainties. High statistics measurements, in combination with improved systematics, will enable NuSOnG to perform discerning tests of fundamental Standard Model parameters as we search for deviations which may hint of 'Beyond the Standard Model' physics.
Date:
June 1, 2009
Creator:
Adams, T.; U., /Florida State; Batra, P.; U., /Columbia; Bugel, Leonard G.; U., /Columbia et al.
Object Type:
Article
System:
The UNT Digital Library
PILOT-SCALE HYDRAULIC TESTING OF RESORCINOL FORMALDEHYDE ION EXCHANGE RESIN
Savannah River National Laboratory (SRNL) performed pilot-scale hydraulic/chemical testing of spherical resorcinol formaldehyde (RF) ion exchange (IX) resin for the River Protection Project-Hanford Tank Waste Treatment & Immobilization Plant (WTP) Project. The RF resin hydraulic cycle testing was conducted in two pilot-scale IX columns, 1/4 and 1/2 scale. A total of twenty-three hydraulic/chemical cycles were successfully completed on the spherical RF resin. Sixteen of these cycles were completed in the 24-inch IX Column (1/2 scale column). Hydraulic testing showed that the permeability of the RF resin remained essentially constant, with no observed trend in the reduction of the permeability as the number of cycles increased. The permeability during the pilot-scale testing was 3 times better than the design requirements of the WTP full-scale IX system. The RF resin bed showed no tendency to form fissures or pack more densely as the number of cycles increased. Particle size measurements of the RF resin showed no indication of particle size change (for a given chemical) with cycles and essentially no fines formation. The permeability of the resin bed was uniform with respect to changes in bed depth. Upflow Regeneration and Simulant Introduction in the IX columns revealed another RF resin benefit; negligible …
Date:
May 28, 2009
Creator:
Adamson, D.
Object Type:
Article
System:
The UNT Digital Library
DEMONSTRATION OF SIMULATED WASTE TRANSFERS FROM TANK AY-102 TO THE HANFORD WASTE TREATMENT FACILITY
In support of Hanford's AY-102 Tank waste certification and delivery of the waste to the Waste Treatment and Immobilization Plant (WTP), Savannah River National Laboratory (SRNL) was tasked by the Washington River Protection Solutions (WRPS) to evaluate the effectiveness of mixing and transferring the waste in the Double Shell Tank (DST) to the WTP Receipt Tank. This work is a follow-on to the previous 'Demonstration of Internal Structures Impacts on Double Shell Tank Mixing Effectiveness' task conducted at SRNL 1. The objective of these transfers was to qualitatively demonstrate how well waste can be transferred out of a mixed DST tank and to provide insights into the consistency between the batches being transferred. Twelve (12) different transfer demonstrations were performed, varying one parameter at a time, in the Batch Transfer Demonstration System. The work focused on visual comparisons of the results from transferring six batches of slurry from a 1/22nd scale (geometric by diameter) Mixing Demonstration Tank (MDT) to six Receipt Tanks, where the consistency of solids in each batch could be compared. The simulant used in this demonstration was composed of simulated Hanford Tank AZ-101 supernate, gibbsite particles, and silicon carbide particles, the same simulant/solid particles used in the …
Date:
December 3, 2009
Creator:
Adamson, D.; Poirier, M. & Steeper, T.
Object Type:
Report
System:
The UNT Digital Library
Observation of muon intensity variations by season with the MINOS far detector
The temperature of the upper atmosphere affects the height of primary cosmic ray interactions and the production of high-energy cosmic ray muons which can be detected deep underground. The MINOS far detector at Soudan MN, USA, has collected over 67 million cosmic ray induced muons. The underground muon rate measured over a period of five years exhibits a 4% peak-to-peak seasonal variation which is highly correlated with the temperature in the upper atmosphere. The coefficient, {alpha}{sub T}, relating changes in the muon rate to changes in atmospheric temperature was found to be: {alpha}{sub T} = 0.874 {+-} 0.009 (stat.) {+-} 0.010$ (syst.). Pions and kaons in the primary hadronic interactions of cosmic rays in the atmosphere contribute differently to {alpha}{sub T} due to the different masses and lifetimes. This allows the measured value of {alpha}{sub T} to be interpreted as a measurement of the K{pi} ratio for E{sub p}/unit[7](TeV) of $0.13 {+-} 0.08, consistent with the expectation from collider experiments.
Date:
September 1, 2009
Creator:
Adamson, P.; Andreopoulos, C.; Arms, K. E.; Armstrong, R.; Auty, D. J.; Ayres, D. S. et al.
Object Type:
Article
System:
The UNT Digital Library
Search for muon-neutrino to electron-neutrino transitions in MINOS
This letter reports on a search for {nu}{sub {mu}} {yields} {nu}{sub e} transitions by the MINOS experiment based on a 3.14 x 10{sup 20} protons-on-target exposure in the Fermilab NuMI beam. We observe 35 events in the Far Detector with a background of 27 {+-} 5(stat.) {+-} 2(syst.) events predicted by the measurements in the Near Detector. If interpreted in terms of {nu}{sub {mu}} {yields} {nu}{sub e} oscillations, this 1.5 {sigma} excess of events is consistent with sin{sup 2}(2{theta}{sub 13}) comparable to the CHOOZ limit when |{Delta}m{sup 2}| = 2.43 x 10{sup -3} eV{sup 2} and sin{sup 2} (2{theta}{sub 23}) = 1.0 are assumed.
Date:
September 1, 2009
Creator:
Adamson, P.; Andreopoulos, C.; Arms, K. E.; Armstrong, R.; Auty, D. J.; Ayres, D. S. et al.
Object Type:
Article
System:
The UNT Digital Library
Imaging the molecular dynamics of dissociative electron attachment to water
Momentum imaging experiments on dissociative electron attachment to the water molecule are combined with ab initio theoretical calculations of the angular dependence of the quantum mechanical amplitude for electron attachment to provide a detailed picture of the molecular dynamics of dissociation attachment via the two lowest energy Feshbach resonances. The combination of momentum imaging experiments and theory can reveal dissociation dynamics for which the axial recoil approximation breaks down and thus provides a powerful reaction microscope for DEA to polyatomics.
Date:
October 19, 2009
Creator:
Adaniya, Hidihito; Rudek, B.; Osipov, Timur; Haxton, Dan; Weber, Thorsten; Rescigno, Thomas N. et al.
Object Type:
Article
System:
The UNT Digital Library
Iran's 2009 Presidential Elections
This report analyzes and discusses Iran's 2009 presidential election, particularly the campaigns of reformist candidate Mir Hussein Musavi and incumbent President Mahmoud Ahmadinejad. Allegations of vote rigging and election fraud have led to protests by supporters of candidate Musavi and have provoked international attention. This report also discusses the Obama Administration's reaction to the election results. This report also discusses briefly the current relationship between the U.S. and Iran, as well as U.S. concerns regarding Iran, such as Iran's efforts at building a nuclear weapons program.
Date:
July 6, 2009
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
Iran's 2009 Presidential Elections
This report analyzes and discusses Iran's 2009 presidential election, particularly the campaigns of reformist candidate Mir Hussein Musavi and incumbent President Mahmoud Ahmadinejad. Allegations of vote rigging and election fraud have led to protests by supporters of candidate Musavi and have provoked international attention.
Date:
June 22, 2009
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
Lebanon: Background and U.S. Relations
This report provides an overview of Lebanese politics, recent events in Lebanon, and current issues in U.S.-Lebanon relations and will be updated to reflect major developments.
Date:
January 21, 2009
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
Lebanon: Background and U.S. Relations
This report provides an overview of Lebanese politics, recent events in Lebanon, and current issues in U.S.-Lebanon relations and will be updated to reflect major developments.
Date:
July 23, 2009
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
Lebanon: Background and U.S. Relations
This report provides an overview of Lebanese politics, recent events in Lebanon, and current issues in U.S.-Lebanon relations and will be updated to reflect major developments.
Date:
May 19, 2009
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
Lebanon: Background and U.S. Relations
This report provides an overview of Lebanese politics, recent events in Lebanon, and current issues in U.S.-Lebanon relations and will be updated to reflect major developments.
Date:
November 2, 2009
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
Lebanon: Background and U.S. Relations
This report provides an overview of Lebanese politics, recent events in Lebanon, and current issues in U.S.-Lebanon relations.
Date:
November 30, 2009
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
U.S. Security Assistance to Lebanon
This report discusses the variety of current U.S. security assistance programs to Lebanon including objectives, vetting processes, end-use monitoring, and issues for Congress. The last section of this report discusses the upcoming elections and the future of U.S. security assistance to Lebanon.
Date:
May 20, 2009
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
Middle East Elections 2009: Lebanon, Iran, Afghanistan, and Iraq
This report provides an overview of the election contests in Lebanon, Iran, Afghanistan, and Iraq, including possible outcomes and implications for U.S. policy. The strategic influence of Iran in the Middle East, the stability of Iraq, and the ongoing war in Afghanistan are at the forefront of U.S. policy and Congressional interest in the region.
Date:
May 18, 2009
Creator:
Addis, Casey L. & Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Iran: Regional Perspectives and U.S. Policy
This report provides a description of Iran's neighbors' policies and interests, options for Congressional consideration, and an analysis of potential regional implications
Date:
October 7, 2009
Creator:
Addis, Casey L.; Blanchard, Christopher M.; Katzman, Kenneth; Migdalovitz, Carol; Nichol, Jim; Sharp, Jeremy M. et al.
Object Type:
Report
System:
The UNT Digital Library