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A 4 to 0.1 nm FEL Based on the SLAC Linac
The author show that using existing electron gun technology and a high energy linac like the one at SLAC, it is possible to build a Free Electron Laser operating around the 4 nm water window. A modest improvement in the gun performance would further allow to extend the FEL to the 0.1 nm region. Such a system would produce radiation with a brightness many order of magnitude above that of any synchrotron radiation source, existing or under construction, with laser power in the multigawatt region and subpicosecond pulse length.
Date:
June 5, 2012
Creator:
Pellegrini, C.
System:
The UNT Digital Library
Ab-initio calculation of optical properties of wurtzitic In_x Ga_1x N and In_x Al_1x N alloys including excitonic effects
None
Date:
September 5, 2012
Creator:
de Carvalho, L C; Schleife, A; Furthmueller, J & Bechstedt, F
System:
The UNT Digital Library
ADAPTING A CERTIFIED SHIPPING PACKAGE FOR STORAGE APPLICATIONS
For years shipping packages have been used to store radioactive materials at many DOE sites. Recently, the K-Area Material Storage facility at the Savannah River Site became interested in and approved the Model 9977 Shipping Package for use as a storage package. In order to allow the 9977 to be stored in the facility, there were a number of evaluations and modifications that were required. There were additional suggested modifications to improve the performance of the package as a storage container that were discussed but not incorporated in the design that is currently in use. This paper will discuss the design being utilized for shipping and storage, suggested modifications that have improved the storage configuration but were not used, as well as modifications that have merit for future adaptations for both the 9977 and for other shipping packages to be used as storage packages.
Date:
June 5, 2012
Creator:
Loftin, B. & Abramczyk, G.
System:
The UNT Digital Library
Advances in X-Band TW Accelerator Structures Operating in the 100 MV/M Regime
A CERN-SLAC-KEK collaboration on high gradient X-band accelerator structure development for CLIC has been ongoing for three years. The major outcome has been the demonstration of stable 100 MV/m gradient operation of a number of CLIC prototype structures. These structures were fabricated using the technology developed from 1994 to 2004 for the GLC/NLC linear collider initiative. One of the goals has been to refine the essential parameters and fabrication procedures needed to realize such a high gradient routinely. Another goal has been to develop structures with stronger dipole mode damping than those for GLC/NLC. The latter requires that the surface temperature rise during the pulse be higher, which may increase the breakdown rate. One structure with heavy damping has been RF processed and another is nearly finished. The breakdown rates of these structures were found to be higher by two orders of magnitude compared to those with equivalent acceleration mode parameters but without the damping features. This paper presents these results together with some of the earlier results from non-damped structures.
Date:
July 5, 2012
Creator:
Higo, Toshiyasu; Higashi, Yasuo; Matsumoto, Shuji; Yokoyama, Kazue; Adolphsen, Chris; Dolgashev, Valery et al.
System:
The UNT Digital Library
Analysis of Deformation Twinning in Tantalum Single Crystals Under Shock Loading Conditions
None
Date:
December 5, 2012
Creator:
Florando, J. N.; Barton, N. R.; El-Dasher, B.; McNaney, J. M. & Kumar, M.
System:
The UNT Digital Library
Beyond DVFS: A First Look at Performance Under a Hardware-Enforced Power Bound
None
Date:
March 5, 2012
Creator:
Rountree, B. R.; Ahn, D. H.; de Supinski, B. R.; Lowenthal, D. K. & Schulz, M.
System:
The UNT Digital Library
BOUT simulations of drift resistive ballooning L-mode turbulence in the edge of the DIII-D tokamak
None
Date:
November 5, 2012
Creator:
Cohen, B. I.; Umansky, M. V.; Nevins, W. M.; Makowski, M.; Boedo, J.; Rudakov, D. et al.
System:
The UNT Digital Library
Brute Force Modeling of the Kessler Syndrome
None
Date:
September 5, 2012
Creator:
Nikolaev, S.; Phillion, D.; Springer, H. K.; deVries, W.; Jiang, M.; Pertica, A. et al.
System:
The UNT Digital Library
Change Management Project award submission
None
Date:
December 5, 2012
Creator:
Teslich, R
System:
The UNT Digital Library
Charge transfer equilibria in ambient-exposed epitaxial graphene on (0001) 6 H-SiC
Article discussing research on charge transfer equilibria in ambient-exposed epitaxial graphene on (0001) 6 H-SiC.
Date:
June 5, 2012
Creator:
Sidorov, Anton N.; Gaskill, D. Kurt.; Buongiorno Nardelli, Marco; Tedesco, Joseph L.; Myers-Ward, Rachel L.; Eddy, Charles R. et al.
System:
The UNT Digital Library
Coexistence of the Alpha and Delta Phases in As-Cast Uranium-Rich U-Zr Alloys
None
Date:
September 5, 2012
Creator:
McKeown, J T; Irukuvarghula, S; Ahn, S; Wall, M; Hsiung, L L; McDeavitt, S et al.
System:
The UNT Digital Library
Compressing Phasor Measurement Data
None
Date:
December 5, 2012
Creator:
Top, P. & Breneman, J.
System:
The UNT Digital Library
Controllable enhanced dragging of light in ultradispersive media
Article discussing research on the controllable enhanced dragging of light in ultradispersive media.
Date:
July 5, 2012
Creator:
Rostovtsev, Yuri V. & Davuluri, Sankar
System:
The UNT Digital Library
DDT of Aluminum/Air Mixtures in a Tunnel
None
Date:
January 5, 2012
Creator:
Balakrishnan, K; Kuhl, A L & Bell, J B
System:
The UNT Digital Library
Design of An 18 MW Beam Dump for 500 GeV Electron/Positron Beams at An ILC
This article presents a report on the progress made in designing 18 MW water based Beam Dumps for electrons or positrons for an International Linear Collider (ILC). Multi-dimensional technology issues have to be addressed for the successful design of the Beam Dump. They include calculations of power deposition by the high energy electron/positron beam bunch trains, computational fluid dynamic analysis of turbulent water flow, mechanical design, process flow analysis, hydrogen/oxygen recombiners, handling of radioactive 7Be and 3H, design of auxiliary equipment, provisions for accident scenarios, remote window exchanger, radiation shielding, etc. The progress made to date is summarized, the current status, and also the issues still to be addressed.
Date:
July 5, 2012
Creator:
Amann, John; /SLAC; Arnold, Ray; /SLAC; Seryi, Andrei; /SLAC et al.
System:
The UNT Digital Library
Development of High Average Power Lasers for the Photon Collider
The laser and optics system for the photon collider seeks to minimize the required laser power by using an optical stacking cavity to recirculate the laser light. An enhancement of between 300 to 400 is desired. In order to achieve this the laser pulses which drive the cavity must precisely match the phase of the pulse circulating within the cavity. We report on simulations of the performance of a stacking cavity to various variations of the drive laser in order to specify the required tolerances of the laser system.
Date:
July 5, 2012
Creator:
Gronberg, Jeff; /LLNL, Livermore; Stuart, Brent; /LLNL, Livermore; Seryi, Andrei & /SLAC
System:
The UNT Digital Library
Dynamic structure factor in warm dense beryllium
None
Date:
April 5, 2012
Creator:
Glenzer, S H; Fortmann, C; Doeppner, T; Plagemann, K U; Sperling, P; Thiele, R et al.
System:
The UNT Digital Library
Electron Transport Studies of Annular Exploders
None
Date:
November 5, 2012
Creator:
Strozzi, D. J.; Tabak, M.; Shay, H. D. & Larson, D. J.
System:
The UNT Digital Library
Expert Unreviewed Safety Question Determinations (USQD)
None
Date:
April 5, 2012
Creator:
Mitchell, M A & Montgomery, P
System:
The UNT Digital Library
Extreme Star Formation in the Host Galaxies of the Fastest Growing Supermassive Black Holes at z = 4.8
This article reports new Herschel observations of extremely luminous optically selected active galactic nuclei.
Date:
March 5, 2012
Creator:
Mor, Rivay; Netzer, Hagai; Trakhtenbrot, Benny; Shemmer, Ohad & Lira, Paulina
System:
The UNT Digital Library
Focused-ion-beam Assisted Growth, Patterning, and Narrowing the Size Sidtributions of ZnO Nanowires for Variable Optical Properties and Enhanced Non-mechanical Energy Conversion
None
Date:
November 5, 2012
Creator:
Wang, X. Y.; Xie, S. F.; Liu, J.; Kucheyev, S. O. & Wang, Y. M.
System:
The UNT Digital Library
A Grid-based Binary Model for Coulomb Collisions in Plasmas
None
Date:
March 5, 2012
Creator:
Cohen, B I; Dimits, A M & Strozzi, D J
System:
The UNT Digital Library
Heterogeneous Task Scheduling for Accelerated OpenMP
None
Date:
January 5, 2012
Creator:
Scogland, T W; Rountree, B; Feng, W & de Supinski, B R
System:
The UNT Digital Library
A Hierarchical Approach for Load Balancing on Parallel Multi-core Systems
None
Date:
March 5, 2012
Creator:
Pilla, L L; Ribeiro, C P; Cordeiro, D; Mei, C; Bhatele, A; Navaux, P A et al.
System:
The UNT Digital Library