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Study of F- Production in BaBar RPCs

Description: The BaBar detector has operated over 200 2nd generation Resistive Plate Chambers (RPCs) in the forward endcap since 2002. Many chambers have increased noise rates and high voltage currents. These aging symptoms are correlated with the integrated RPC current as expected, but also depend on the rate and direction of the gas flow, indicating that pollutants produced in the gas can accelerate aging of downstream RPC surfaces. HF produced by decomposition of the Freon 134a component of the BaBar RPC… more
Date: February 22, 2008
Creator: Band, H.R.; /Wisconsin U., Madison; Bellini, F.; /Rome U. /INFN, Rome; Covarelli, R.; /Perugia U. /INFN, Perugia et al.
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Partner: UNT Libraries Government Documents Department
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B, D and K Decays

Description: The present report documents the results of Working Group 2: B, D and K decays, of the workshop on Flavor in the Era of the LHC, held at CERN from November 2005 through March 2007. With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct detection of new particles will be the main avenue to establish the presence of NP at the LHC, indirect searches wi… more
Date: March 7, 2008
Creator: Artuso, M.; Asner, D. M.; Ball, P.; Baracchini, E.; Bell, G.; Beneke, M. et al.
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Partner: UNT Libraries Government Documents Department
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The state of the art in hadron beam cooling

Description: Cooling of hadron beams (including heavy-ions) is a powerful technique by which accelerator facilities around the world achieve the necessary beam brightness for their physics research. In this paper, we will give an overview of the latest developments in hadron beam cooling, for which high energy electron cooling at Fermilab's Recycler ring and bunched beam stochastic cooling at Brookhaven National Laboratory's RHIC facility represent two recent major accomplishments. Novel ideas in the field … more
Date: September 1, 2008
Creator: Prost, L. R. & Derwent, P.
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Partner: UNT Libraries Government Documents Department
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Engineered and Administrative Safety Systems for the Control of Prompt Radiation Hazards at Accelerator Facilities

Description: The ANSI N43.1 Standard, currently in revision (ANSI 2007), sets forth the requirements for accelerator facilities to provide adequate protection for the workers, the public and the environment from the hazards of ionizing radiation produced during and from accelerator operations. The Standard also recommends good practices that, when followed, provide a level of radiation protection consistent with those established for the accelerator communities. The N43.1 Standard is suitable for all accele… more
Date: December 17, 2007
Creator: Liu, James C.; Vylet, Vashek & Walker, Lawrence S.
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Partner: UNT Libraries Government Documents Department
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A review of ground-based heavy-ion radiobiology relevant to space radiation risk assessment: Part II. Cardiovascular and immunological effects

Description: The future of manned space flight depends on an analysis of the numerous potential risks of travel into deep space. Currently no radiation dose limits have been established for these exploratory missions. To set these standards more information is needed about potential acute and late effects on human physiology from appropriate radiation exposure scenarios, including pertinent radiation types and dose rates. Cancer risks have long been considered the most serious late effect from chronic daily… more
Date: February 26, 2007
Creator: Blakely, Eleanor A. & Chang, Polly Y.
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Partner: UNT Libraries Government Documents Department
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Comparative Study of Vibration Stability at Operating Light Source Facilities and Lessons Learned in Achieving NSLS II Stability Goals

Description: In an effort to ensure that the stability goals of the NSLS II will be met once the accelerator structure is set on the selected BNL site a comprehensive evaluation of the ground vibration observed at existing light source facilities has been undertaken. The study has relied on measurement data collected and reported by the operating facilities as well as on new data collected in the course of this study. The primary goal of this comprehensive effort is to compare the green-field conditions tha… more
Date: June 23, 2008
Creator: Simos,N.; Fallier, M. & Amick, H.
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Partner: UNT Libraries Government Documents Department
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SciDAC advances in beam dynamics simulation: from light sources to colliders

Description: In this paper, we report on progress that has been made in beam dynamics simulation, from light sources to colliders, during the first year of SciDAC-II accelerator project,"Community Petascale Project for Accelerator Science and Simulation (ComPASS)." Several parallel computational tools for beam dynamics simulation will be described. A number of applications in current and future accelerator facilities, e.g., LCLS, RHIC, Tevatron, LHC, ELIC, are presented.
Date: June 16, 2008
Creator: Qiang, Ji; Qiang, J.; Borland, M.; Kabel, A.; Li, R.; Ryne, R. et al.
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Partner: UNT Libraries Government Documents Department
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Enhanced Method for Cavity Impedance Calculations

Description: With the proposal of medium to high average current accelerator facilities the demand for cavities with extremely low Higher Order Mode (HOM) impedances is increasing. Modern numerical tools are still under development to more thoroughly predict impedances that need to take into account complex absorbing boundaries and lossy materials. With the usually large problem size it is preferable to utilize massive parallel computing when applicable and available. Apart from such computational issues, w… more
Date: May 1, 2009
Creator: Marhauser, Frank; Rimmer, Robert; Tian, Kai & Wang, Haipeng
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Partner: UNT Libraries Government Documents Department
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High-Fidelity RF Gun Simulations with the Parallel 3D Finite Element Particle-In-Cell Code Pic3P

Description: SLAC's Advanced Computations Department (ACD) has developed the first parallel Finite Element 3D Particle-In-Cell (PIC) code, Pic3P, for simulations of RF guns and other space-charge dominated beam-cavity interactions. Pic3P solves the complete set of Maxwell-Lorentz equations and thus includes space charge, retardation and wakefield effects from first principles. Pic3P uses higher-order Finite Elementmethods on unstructured conformal meshes. A novel scheme for causal adaptive refinement and dy… more
Date: June 19, 2009
Creator: Candel, A; Kabel, A.; Lee, L.; Li, Z.; Limborg, C.; Ng, C. et al.
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Partner: UNT Libraries Government Documents Department
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Wakefield Computations for the CLIC PETS using the Parallel Finite Element Time-Domain Code T3P

Description: In recent years, SLAC's Advanced Computations Department (ACD) has developed the high-performance parallel 3D electromagnetic time-domain code, T3P, for simulations of wakefields and transients in complex accelerator structures. T3P is based on advanced higher-order Finite Element methods on unstructured grids with quadratic surface approximation. Optimized for large-scale parallel processing on leadership supercomputing facilities, T3P allows simulations of realistic 3D structures with unprece… more
Date: June 19, 2009
Creator: Candel, A; Kabel, A.; Lee, L.; Li, Z.; Ng, C.; Schussman, G. et al.
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Partner: UNT Libraries Government Documents Department
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State of the art in electromagnetic modeling for the Compact Linear Collider

Description: SLAC's Advanced Computations Department (ACD) has developed the parallel 3D electromagnetic time-domain code T3P for simulations of wakefields and transients in complex accelerator structures. T3P is based on state-of-the-art Finite Element methods on unstructured grids and features unconditional stability, quadratic surface approximation and up to 6th-order vector basis functions for unprecedented simulation accuracy. Optimized for large-scale parallel processing on leadership supercomputing f… more
Date: July 10, 2009
Creator: Candel, Arno; Kabel, Andreas; Lee, Lie-Quan; Li, Zenghai; Ng, Cho; Schussman, Greg et al.
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Partner: UNT Libraries Government Documents Department
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A Software Architecture for High Level Applications

Description: A modular software platform for high level applications is under development at the National Synchrotron Light Source II project. This platform is based on client-server architecture, and the components of high level applications on this platform will be modular and distributed, and therefore reusable. An online model server is indispensable for model based control. Different accelerator facilities have different requirements for the online simulation. To supply various accelerator simulators, … more
Date: May 4, 2009
Creator: Shen,G.
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Partner: UNT Libraries Government Documents Department
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Parallel 3D Finite Element Particle-in-Cell Simulations with Pic3P

Description: SLAC's Advanced Computations Department (ACD) has developed the parallel 3D Finite Element electromagnetic Particle-In-Cell code Pic3P. Designed for simulations of beam-cavity interactions dominated by space charge effects, Pic3P solves the complete set of Maxwell-Lorentz equations self-consistently and includes space-charge, retardation and boundary effects from first principles. Higher-order Finite Element methods with adaptive refinement on conformal unstructured meshes lead to highly effici… more
Date: June 19, 2009
Creator: Candel, A.; Kabel, A.; Lee, L.; Li, Z.; Ng, C.; Schussman, G. et al.
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Partner: UNT Libraries Government Documents Department
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High power fast ramping power supplies

Description: Hundred megawatt level fast ramping power converters to drive proton and heavy ion machines are under research and development at accelerator facilities in the world. This is a leading edge technology. There are several topologies to achieve this power level. Their advantages and related issues will be discussed.
Date: May 4, 2009
Creator: Marneris, I.; Bajon, E.; Bonati, R.; Sandberg, J.; Roser, T. & Tsoupas, N.
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Partner: UNT Libraries Government Documents Department
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Advances and future needs in particle production and transport code developments

Description: The next generation of accelerators and ever expanding needs of existing accelerators demand new developments and additions to Monte-Carlo codes, with an emphasis on enhanced modeling of elementary particle and heavy-ion interactions and transport. Challenges arise from extremely high beam energies and beam power, increasing complexity of accelerators and experimental setups, as well as design, engineering and performance constraints. All these put unprecedented requirements on the accuracy of … more
Date: December 1, 2009
Creator: Mokhov, N. V.
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Partner: UNT Libraries Government Documents Department
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Parallel Finite Element Particle-In-Cell Code for Simulations of Space-charge Dominated Beam-Cavity Interactions

Description: Over the past years, SLAC's Advanced Computations Department (ACD) has developed the parallel finite element (FE) particle-in-cell code Pic3P (Pic2P) for simulations of beam-cavity interactions dominated by space-charge effects. As opposed to standard space-charge dominated beam transport codes, which are based on the electrostatic approximation, Pic3P (Pic2P) includes space-charge, retardation and boundary effects as it self-consistently solves the complete set of Maxwell-Lorentz equations usi… more
Date: November 7, 2007
Creator: Candel, A. E.; Kabel, A. C.; Ko, Yong-kyu; Lee, L.; Li, Z.; Limborg-Deprey, C. et al.
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Partner: UNT Libraries Government Documents Department
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Charting the Course for Elementary Particle Physics

Description: ''It was the best of times; it was the worst of times'' is the way Dickens begins the Tale of Two Cities. The line is appropriate to our time in particle physics. It is the best of times because we are in the midst of a revolution in understanding, the third to occur during my career. It is the worst of times because accelerator facilities are shutting down before new ones are opening, restricting the opportunity for experiments, and because of great uncertainty about future funding. My task to… more
Date: February 20, 2007
Creator: Richter, Burton
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Partner: UNT Libraries Government Documents Department
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Comparison of Design and Practices for Radiation Safety among Five Synchrotron Radiation Facilities

Description: There are more and more third-generation synchrotron radiation (SR) facilities in the world that utilize low emittance electron (or positron) beam circulating in a storage ring to generate synchrotron light for various types of experiments. A storage ring based SR facility consists of an injector, a storage ring, and many SR beamlines. When compared to other types of accelerator facilities, the design and practices for radiation safety of storage ring and SR beamlines are unique to SR facilitie… more
Date: June 29, 2005
Creator: Liu, James C.; Rokni, Sayed H.; Asano, Yoshihiro; Casey, William R. & Donahue, Richard J.
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Partner: UNT Libraries Government Documents Department
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Noninvasive Laser Probing of Ultrashort Single Electron Bunches for Accelerator And Light Source Development

Description: Companion development of ultrafast electron beam diagnostics capable of noninvasively resolving single bunch detail is essential for the development of high energy, high brightness accelerator facilities and associated beam-based light source applications. Existing conventional accelerators can exhibit timing-jitter down to the 100 femtosecond level which exceeds their single bunch duration capability. At the other extreme, in relatively jitterless environments, laser-plasma wakefield accelerat… more
Date: June 11, 2007
Creator: Bolton, P. R.
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Partner: UNT Libraries Government Documents Department
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Experimental Transport Benchmarks for Physical Dosimetry to Support Development of Fast-Neutron Therapy with Neutron Capture Augmentation

Description: The Idaho National Laboratory (INL), the University of Washington (UW) Neutron Therapy Center, the University of Essen (Germany) Neutron Therapy Clinic, and the Northern Illinois University(NIU) Institute for Neutron Therapy at Fermilab have been collaborating in the development of fast-neutron therapy (FNT) with concurrent neutron capture (NCT) augmentation [1,2]. As part of this effort, we have conducted measurements to produce suitable benchmark data as an aid in validation of advanced three… more
Date: June 1, 2006
Creator: Nigg, D. W.; Hartwell, J. K.; Venhuizen, J. R.; Wemple, C. A.; Risler, R.; Laramore, G. E. et al.
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Partner: UNT Libraries Government Documents Department
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Status of experimental data base development relevant to spaceradiation transport and protection

Description: This report describes the highlights and progress made in aprogram of measurements studying radiation transport through materials ofinterest to NASA. All measurements were preformed at acceleratorfacilities, primarily using GCR-like heavy-ion beams incident uponvarious elemental and composite targets. Both primary and secondaryparticles exiting the target were measured. The secondary particlesinclude both charged particles and neutrons. These measurements serve asuseful benchmarks and input to … more
Date: April 1, 2004
Creator: Heilbronn, Lawrence H.; Guetersloh, Stephen; Zeitlin, Cary & Miller, Jack
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Partner: UNT Libraries Government Documents Department
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Gas Test Loop Facilities Alternatives Assessment Report Rev 1

Description: An important task in the Gas Test Loop (GTL) conceptual design was to determine the best facility to serve as host for this apparatus, which will allow fast-flux neutron testing in an existing nuclear facility. A survey was undertaken of domestic and foreign nuclear reactors and accelerator facilities to arrive at that determination. Two major research reactors in the U.S. were considered in detail, the Advanced Test Reactor (ATR) and the High Flux Isotope Reactor (HFIR), each with sufficient p… more
Date: July 1, 2005
Creator: Skerjanc, William J. & Skerjanc, William F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Radiological Environmental Protection for PEP-II Ring High Luminosity Operation

Description: Stanford Linear Accelerator Center (SLAC) is located in northern California, USA. Radiological environmental protection is one of the main elements of the radiation protection program. One of SLAC's accelerator facilities is B-Factory, whose PEP-II accelerator ring has been operating since 1997 and is being upgraded to higher luminosity operation. Four radiological issues associated with high luminosity operation up to CY2008 are re-evaluated: (1) annual doses in IR halls, (2) annual skyshine d… more
Date: August 16, 2006
Creator: Liu, James C. & Nakao, Noriaki
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Partner: UNT Libraries Government Documents Department
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XTOD - XES Interface Control Document

Description: This document describes the interface between the LCLS XTOD System (WBS No.1.5) and the LCLS XES (WBS No.1.6). The interface locations ranging from the beam dump to the far experimental hall are identified. Subsystems that connect at or cross the boundary are identified.
Date: September 7, 2005
Creator: Trent, J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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