A5041119441- Scientific Computing and Data Management
- Opinion Dynamics and Social Influence
- Software Engineering Techniques and Practices
- Nuclear Issues and Defense
- Complex Network Analysis Techniques
- Research Data Management Practices
- Risk Perception and Management
- Peer-to-Peer Network Technologies
- Anthropology: Ethics, History, Culture
- Photocathodes and Microchannel Plates
- Software Engineering Research
- Reliability and Maintenance Optimization
- Occupational Health and Safety Research
- Business Process Modeling and Analysis
- Risk and Safety Analysis
- Probabilistic and Robust Engineering Design
- Terrorism, Counterterrorism, and Political Violence
- Gyrotron and Vacuum Electronics Research
- Chemical Safety and Risk Management
- Particle accelerators and beam dynamics
- Technology Assessment and Management
- Particle Accelerators and Free-Electron Lasers
- Open Source Software Innovations
- Data Visualization and Analytics
- Big Data and Business Intelligence
Los Alamos National Laboratory
2013-2024
Michigan State University
2021-2023
Los Alamos Medical Center
2011
Instituto Benjamin Constant
2002
Computational and data-enabled science engineering are revolutionizing advances throughout society, at all scales of computing. For example, teams in the U.S. DOE Exascale Computing Project have been tackling new frontiers modeling, simulation, analysis by exploiting unprecedented exascale computing capabilities—building an advanced software ecosystem that supports next-generation applications addresses disruptive changes computer architectures. However, concerns growing about productivity...
Successful testing depends upon projecting from a test situation to the performance of technology under working conditions. Some have argued that projection is made possible primarily through collective agreement circumstances and conditions are similar in crucial ways. This paper argues better understood many cases as set local practices which produces change wider context use. In earthquake-engineering laboratory described here, this connection circulation skilled people, material objects...
During the Cold War, credibility of US nuclear weapons scientists was backed up by an integrated system for designing, testing, and manufacturing weapons. As War drew to a close in 1990s, warned that their knowledge so deeply embedded design testing it might not survive if this were disrupted. Sociologists Donald MacKenzie Graham Spinardi used as evidence role tacit design, suggesting halt could bring on crisis credibility, possibly ‘uninvention’ In paper, we examine how community has...
Scientific laboratories can sometimes be dangerous places to work, and safety concerns have a significant impact on the scientific research process. Because practices specify both behavioral norms technical standards, they provide an opportunity better understand relationships between organizational epistemic aspects of culture. This paper presents case study ‘pulsed-power’ facility at US Los Alamos National Laboratory, where electrical hazards are major concern. Drawing work by Mary Douglas...
L'ouragan Katrina deferla le 29 aout 2005 sur les cotes de la Louisiane aux Etats-Unis. Les consequences cette catastrophe naturelle ville La Nouvelle-Orleans furent desatreuses : innodations, pillages... articles ce dossier analysent en detail resposabilite des differents acteurs dans gestion crise et l'envisagent sous un angle historique philosophique. sont suivants Things Fall Apart Disaster, Infrastructure, and Risk ; Hurricane Stories, from Within Environmental Justice Expert Knowledge...
Scientific research communities can be represented as heterogeneous or multidimensional networks encompassing multiple types of entities and relationships. These might include researchers, institutions, meetings, publications, connected by relationships like authorship, employment, attendance. We describe a method for efficiently flexibly capturing, storing, extracting information from scientific using graph database. The database structure is based on an ontology that captures allowable...
US national research laboratories and agencies play an integral role in advancing science technology for the public good. The authors of this article, as Research Software Engineers (RSEs) allies from eight unique organizations, came together to explore RSE needs perspective development institutions. We identified three key areas improvement future RSEs pursue interest: community establishment, hiring retention, recognition. To retain cultivate essential talent, institutions must evolve...
High current bright sources are needed to power the next generation of compact rf and microwave systems. A major requirement is that such a source could be sustainably operated at high frequencies, well above 1 GHz, gradients, 100 MV/m. Field emission offer simplicity scalability in frequency era injector design, but output cycle charge gradient operation remain great largely unaddressed challenge. Here, field cathode based on ultra-nano-crystalline diamond or UNCD, an efficient planar...
This paper presents findings from a study of the email network large scientific research organization, focusing on methods for visualizing and modeling organizational hierarchies within large, complex datasets. In first part paper, we find that visualization interpretation data is facilitated by integration with information formal divisions levels. By aggregating traffic between units at various levels, derive several insights into how subdivisions organization interact each other outside...
Scientific users present unique challenges to visualization researchers. Their high-level tasks require them apply domain-specific expertise. We introduce a broader audience the CinemaScience project and demonstrate how enables efficient workflows that can bring in scientist expertise drive scientific insight.
In this work, a combination of cathode retraction and two-slit emittance measurement technique is proposed as an advanced means to individually modify growth components, specifically, rf injector fringe fields, isolate directly measure the thermal emittance, fundamental beam metric for electron beam. A case study LCLS-II-HE Low Emittance Injector (LEI), state-of-the-art superconducting radiofrequency (SRF) gun, designed LCLS-II HE upgrade used showcase power technique. Particularly, it...
We present the design and characterization of a dual-mode radiofrequency (rf) cavity, novel electromagnetic structure with potential benefits such as compactness, efficiency, cost reduction multifunctionality. The cavity was designed to balance considering several factors, mode frequencies, quality factor (Q-factor), minimizing cross talk between couplers. preformed various tests verify that this expected compared simulated results. As exampled here, combination fundamental TM 010 011 mode,...
This paper discusses the trends and tradeoffs between transverse ${\ensuremath{\sigma}}_{x}$ longitudinal ${\ensuremath{\sigma}}_{z}$ bunch dimensions, rf injector gradient, charge, intrinsic electron mean energy (MTE), where all can be chosen to independent, resulting effects on emittance brightness. Using a practical example of quarter wave normal conducting photoinjector, it is computationally found that regardless MTE there universal relation gradient $E$ aspect ratio...
With the end of "Cold War" U.S. nuclear weapon design laboratories has new work to do and their budgets remained intact. The paper discusses different programs proposals regarding maintenance transformation in weapons.