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in creator/contributor: "Petersen, B."  
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Photoelectron holography applied to surface structural determination

Description: Photoemitted electron waves are used as coherent source waves for angstrom-scale holographic imaging of local atomic geometry at surfaces. Electron angular distribution patterns are collected above a sample surface and serve as a record of the interference between source wave and waves scattered from surrounding ion cores. Using a mathematical imaging integral transformation, the three-dimensional structural information is obtained directly from these collected patterns. Patterns measured with … more
Date: May 1, 1995
Creator: Petersen, B.L.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

The first forty years, 1947-1987

Description: This report commemorates the fortieth anniversary of Brookhaven National Laboratory by representing a historical overview of research at the facility. The chapters of the report are entitled: The First Forty Years, Brookhaven: A National Resource, Fulfilling a Mission - Brookhaven's Mighty Machines, Marketing the Milestones in Basic Research, Meeting National Needs, Making a Difference in Everyday Life, and Looking Forward.
Date: January 1, 1987
Creator: Rowe, M.S. (ed.); Cohen, A. & Petersen, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A 1.8 K test facility for superconducting RF cavities

Description: To demonstrate the feasibility of superconducting RF technology for a high energy e{sup +}/e{sup {minus}} collider, a research and development program has begun with collaborators from Europe, Asia, and North America. The immediate goal of the R&D program is to build and operate a 50 meter-long linac at DESY with 1.3 GHz superconducting RF cavities at a temperature of 1.8 K - 2.0 K and an accelerating gradient of 15 MV/meter. The refrigeration for the test system at DESY initially will have a c… more
Date: April 1, 1994
Creator: Horlitz, G.; Knopf, U.; Lange, R.; Petersen, B.; Sellmann, D.; Trines, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Holographic atom imaging from experimental photoelectron angular distribution patterns

Description: One of the most challenging areas of materials research is the imaging of technologically relevant materials with microscopic and atomic-scale resolution. As part of the development of these methods, near-surface atoms in single crystals were imaged using core-level photoelectron holograms. The angle-dependent electron diffraction patterns that constitute an electron hologram were two-dimensionally transformed to create a three dimensional, real-space image of the neighboring scattering atoms. … more
Date: November 1, 1993
Creator: Terminello, L. J.; Lapiano-Smith, D. A.; Barton, J. J.; Petersen, B. L. & Shirley, D. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Toward a surface photoelectron diffractometer: A progress report on selected advances and an assessment

Description: X-ray diffractometric determination of atomic structures in ordered bulk systems is highly automated and has wide application. By contrast, surface crystallography, whether based on photon or electron scattering, is still in a relatively early stage of development. A summary is given of recent selected highlights in efforts to make progress toward surface photoelectron diffractometry and holography by our Berkeley-Penn State group. It is concluded that an automated photoelectron diffractometer … more
Date: October 6, 1993
Creator: Shirley, D. A; Zheng, Yu; Petersen, B. L.; Hussain, Z.; Huff, W. A.; Barton, J. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Radiation monitoring with CVD Diamonds and PIN Diodes at BaBar

Description: The BaBar experiment at the Stanford Linear Accelerator Center has been using two polycrystalline chemical vapor deposition (pCVD) diamonds and 12 silicon PIN diodes for radiation monitoring and protection of the Silicon Vertex Tracker (SVT). We have used the pCVD diamonds for more than 3 years, and the PIN diodes for 7 years. We will describe the SVT and SVT radiation monitoring system as well as the operational difficulties and radiation damage effects on the PIN diodes and pCVD diamonds in a… more
Date: February 13, 2008
Creator: Bruinsma, M.; Burchat, P.; Curry, S.; Edwards, A.J.; Kagan, H.; Kass, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Geant4-based Simulation Study of PEP-II Beam Backgrounds in the BABAR Detector at the SLAC B-Factory

Description: To improve the understanding of accelerator-induced backgrounds at the SLAC B-Factory, we simulate lost particle backgrounds in the BABAR detector originating from beam-gas interactions and radiative Bhabha scatters. We have extended the GEANT4-based BABAR detector simulation to include beam-line components and magnetic fields up to 8.5 m away from the interaction point. We describe the simulation model and then compare preliminary predicted background levels with measurements from dedicated si… more
Date: June 7, 2005
Creator: Lockman, W.S.; /UC, Santa Cruz; Kozanecki, W.; /DAPNIA, Saclay; Campbell, B.; Robertson, S.H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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