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open access

Experiment to Detect Accelerating Modes in a Photonic Bandgap Fiber

Description: An experimental effort is currently underway at the E-163 test beamline at Stanford Linear Accelerator Center to use a hollow-core photonic bandgap (PBG) fiber as a high-gradient laser-based accelerating structure for electron bunches. For the initial stage of this experiment, a 50pC, 60 MeV electron beam will be coupled into the fiber core and the excited modes will be detected using a spectrograph to resolve their frequency signatures in the wakefield radiation generated by the beam. They wil… more
Date: November 21, 2011
Creator: England, R.J.; /SLAC; Colby, E.R.; /SLAC; Ischebeck, R.; /Munich, Max Planck Inst. Quantenopt. et al.
Item Type: Refine your search to only Article
open access

GROUNDWATER MONITORING REPORT GENERATION TOOLS - 12005

Description: Compliance with National and State environmental regulations (e.g. Resource Conservation and Recovery Act (RCRA) and Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) aka SuperFund) requires Savannah River Site (SRS) to extensively collect and report groundwater monitoring data, with potential fines for missed reporting deadlines. Several utilities have been developed at SRS to facilitate production of the regulatory reports which include maps, data tables, charts a… more
Date: November 21, 2011
Creator: Lopez, N.
Item Type: Refine your search to only Article
open access

Jordan: Background and U.S. Relations

Description: This report provides an overview of Jordanian politics and current issues in U.S.-Jordanian relations. It provides a brief discussion of Jordan's government and economy and of its cooperation in promoting Arab-Israeli peace and other U.S. policy objectives in the Middle East.
Date: November 21, 2011
Creator: Sharp, Jeremy M.
Item Type: Refine your search to only Report
open access

The Lord's Resistance Army: The U.S. Response

Description: This report discusses the Lord's Resistance Army (LRA) and United States policy, strategic and humanitarian response. LRA is an armed group that originated in northern Uganda 24 years ago but has operated since 2006 in the remote border areas between the Central African Republic (CAR), Democratic Republic of Congo (DRC), and South Sudan. Led by Joseph Kony, its numbers are tiny, but its actions, which include massacres, mass abductions, sexual assault, and looting, have caused significant human… more
Date: November 21, 2011
Creator: Arieff, Alexis & Ploch, Lauren
Item Type: Refine your search to only Report
open access

Particle Physics Outreach to Secondary Education

Description: This review summarizes exemplary secondary education and outreach programs of the particle physics community. We examine programs from the following areas: research experiences, high-energy physics data for students, informal learning for students, instructional resources, and professional development. We report findings about these programs' impact on students and teachers and provide suggestions for practices that create effective programs from those findings. We also include some methods for… more
Date: November 21, 2011
Creator: Bardeen, Marjorie G.; Johansson, K. Erik & Young, M. Jean
Item Type: Refine your search to only Article
open access

Quarkonium States at B-Factories

Description: An overview is given on recent progress in the study of quarkonium spectroscopy at the B-factories. In particular, an updated status report is presented of the long list of 'charmonium-like' resonances newly discovered, whose assignment as true charmonium states is in most cases at least controversial. Also, new measurements on the decay properties of bottomonium states above open-B production thresholds are shown. Much of the progress attained in recent years in the study of the quarkonium spe… more
Date: November 21, 2011
Creator: Robutti, Enrico & /INFN, Genoa
Item Type: Refine your search to only Article
open access

Scrape-Off-Layer Flow Studies in Tokamaks: Final Report of LDRD Project 09-ERD-025

Description: A summary is given of the work carried out under the LDRD project 09-ERD-025 entitled Scrape-Off-Layer Flow Studies in Tokamaks. This project has lead to implementation of the new prototype Fourier Transform Spectrometer edge plasma flow diagnostic on the DIII-D National Fusion Facility at General Atomics, acquisition of carbon impurity concentration and flow data, and demonstration that the resulting data compare reasonably well with LLNL's edge plasma transport code UEDGE. Details of the work… more
Date: November 21, 2011
Creator: Rognlien, T. D.; Allen, S. L.; Ellis, R. M.; Porter, G. D.; Nam, S. K.; Weber, T. R. et al.
Item Type: Refine your search to only Report
open access

Solid Collection Efforts: Ta Collimator Evaluation

Description: Ta collimator sets that were part of the gated x-ray detector diagnostic (GXD) at NIF were analyzed for debris distribution and damage in 2011. These disks (ranging in thickness from 250 to 750 {mu}m) were fielded approximately 10 cm from target chamber center (TCC) on various symcap, THD and re-emit shots. The nose cone holder and forward Ta collimator (facing target chamber center, TCC) from all shots show evidence of surface melt. Non-destructive analysis techniques such as optical microscop… more
Date: November 21, 2011
Creator: Gostic, J M
Item Type: Refine your search to only Report
open access

Summary of Blast Shield and Material Testing for Development of Solid Debris Collection at the National Ignition Facility (NIF)

Description: The ability to collect solid debris from the target chamber following a NIF shot has application for both capsule diagnostics, particularly for fuel-ablator mix, and measuring cross sections relevant to the Stockpile Stewardship program and nuclear astrophysics. Simulations have shown that doping the capsule with up to 10{sup 15} atoms of an impurity not otherwise found in the capsule does not affect its performance. The dopant is an element that will undergo nuclear activations during the NIF … more
Date: November 21, 2011
Creator: Shaughnessy, D A; Gostic, J M; Moody, K J; Grant, P M; Lewis, L A & Hutcheon, I D
Item Type: Refine your search to only Report
open access

Target Visualization at the National Ignition Facility

Description: As the National Ignition Facility continues its campaign to achieve ignition, new methods and tools will be required to measure the quality of the targets used to achieve this goal. Techniques have been developed to measure target surface features using a phase-shifting diffraction interferometer and Leica Microsystems confocal microscope. Using these techniques we are able to produce a detailed view of the shell surface, which in turn allows us to refine target manufacturing and cleaning proce… more
Date: November 21, 2011
Creator: Potter, D
Item Type: Refine your search to only Thesis or Dissertation
open access

Transportation Security Information Sharing: Stakeholders Generally Satisfied but TSA Could Improve Analysis, Awareness, and Accountability

Description: A letter report issued by the Government Accountability Office with an abstract that begins "The U.S. transportation system, comprised of aviation, freight rail, highway, maritime, mass transit and passenger rail, and pipelines, moves billions of passengers and millions of tons of goods each year. Disrupted terrorist attacks involving rail and air cargo in 2010 demonstrate the importance of effective information sharing with transportation security stakeholders. The Transportation Security Admi… more
Date: November 21, 2011
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Report
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