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in creator/contributor: "Catalan-Lasheras, N."  
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Electron Cloud Mitigation in the Spallation Neutron Source Ring

Description: The Spallation Neutron Source (SNS) accumulator ring is designed to accumulate, via H{sup -} injection, protons of 2 MW beam power at 1 GeV kinetic energy at a repetition rate of 60 Hz [1]. At such beam intensity, electron-cloud is expected to be one of the intensity-limiting mechanisms that complicate ring operations. This paper summarizes mitigation strategy adopted in the design, both in suppressing electron-cloud formation and in enhancing Landau damping, including tapered magnetic field an… more
Date: March 17, 2008
Creator: Wei, J.; Blaskiewicz, Michael; Brodowski, J.; Cameron, P.; Davino, Daniele; Fedotov, A. et al.
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Partner: UNT Libraries Government Documents Department
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ACCELERATOR PHYSICS MODEL OF EXPECTED BEAM LOSS ALONG THE SNS ACCELERATOR FACILITY DURING NORMAL OPERATION.

Description: The most demanding requirement in the design of the SNS accelerator chain is to keep the accelerator complex under hands-on maintenance. This requirement implies a hard limit for residual radiation below 100 mrem/hr at one feet from the vacuum pipe and four hours after shutdown for hundred days of normal operation. It has been shown by measurements as well as simulation [l] that this limit corresponds to 1-2 Watts/meter average beam losses. This loss level is achievable all around the machine e… more
Date: June 3, 2002
Creator: Catalan-Lasheras, N.; Cousineau, S.; Galambos, J.; Holtkamp, N.; Raparia, D.; Shafer, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Transverse Instabilities in Rhic.

Description: The beam quality in RHIC can be significantly impacted by a transverse instability which can occur just after transition [1]. Data characterizing the instability are presented and analyzed. Techniques for ameliorating the situation are considered.
Date: May 12, 2003
Creator: Blaskiewicz, M.; Cameron, P.; Catalan-Lasheras, N.; Dawson, C.; Degen, C.; Drees, K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Assessment of Thermal Shock Attenuation in the Particle Bed of the Spallation Neutron Source Collimator

Description: A thermal shock analysis in a particle bed that surrounds the Spallation Neutron Source (SNS) beam tube in the various collimation locations is performed using a detailed thermal/stress wave propagation formulation. The goal of this effort is to assess the response of the particle bed when subjected to the full proton beam under off-normal operating conditions and its ability to attenuate the induced stress shock. Conclusions are drawn on the basis of comparison between the responses of (a) the… more
Date: June 30, 2000
Creator: Simos, N.; Ludewig, H.; Walker, J.; Catalan-Lasheras, N.; Wei, J. & Todosow, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preliminary estimates of dose and residual activation of selected components in ring collimation straight of the SNS

Description: The highest doses to components in the SNS ring are expected to be to those located in the collimation straight section. In this paper the authors present estimated doses to magnets and cable located between collimators. In addition the buildup of relatively long half-life radioactive isotopes is estimated, following machine operation and shutdown. Finally, the potential dose to operators approaching the machine following operation and shutdown for four hours is made. The results indicate that … more
Date: June 30, 2000
Creator: Ludewig, H.; Catalan-Lasheras, N.; Simos, N.; Walker, J.; Mallen, A.; Wei, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Collimation System of the Sns Transfer Lines.

Description: The High Energy Beam Transport (HEBT) and Ring to Target Beam Transport (RTBT) lines of the Spallation Neutron Source (SNS) include collimation systems that protect the line itself, as well as the systems downstream. Due to the one-pass mechanism in a transfer line, collimation can only provide protection against accidental losses while shaping the beam is reserved for multi-pass systems as rings. Efficiency has to be improved by increasing the impact parameter in the collimator in the first pa… more
Date: June 18, 2001
Creator: Catalan-Lasheras, N. & Raparia, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Double-Wall Collimator Design of the SNS Project

Description: The collimator absorber array of the Spallation Neutron Source (SNS) project is responsible for stopping the 1.0 GeV protons that are in the halo of the beam. It is estimated that 0.1% of the 2 MW beam will be intercepted by the adopted collimating scheme implemented at various sections of the beam transport and accumulation. This paper summarizes the conceptual design of the collimator absorber as well as the supporting detailed analysis that were performed and guided the design process. Key r… more
Date: June 18, 2001
Creator: Simos, N.; Ludewig, H.; Catalan-Lasheras, N. & Crivello, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design Optimization and the Path Towards a 2 MW Spallation Neutron Source

Description: The Spallation Neutron Source (SNS) is designed to ultimately reach an average proton beam power of 2 MW for pulsed neutron production. The SNS physics groups analyze the machine performance within the hardware constraints, optimize the accelerator design, and establish the best path towards a 2 MW and higher spallation neutron source.
Date: June 18, 2001
Creator: Wei, J.; Blaskiewicz, M.; Catalan-Lasheras, N.; Davino, D.; Fedotov, A.; Lee, Y. Y. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Thermo-Mechanical Response of the Halo Intercepts Interacting with the SNS Proton Beam

Description: Integral part of the primary collimator of the SNS accumulator ring is a halo intercept assembly in the form of movable scraper blades that allow interception of the halo protons in four planes. In order to achieve large coulomb scattering of the halo protons and energy losses of less than 1%, platinum was chosen as the material of choice while its thickness was optimized to satisfy the energy loss requirements. This paper outlines the adopted design of the scraper assembly and presents the the… more
Date: June 18, 2001
Creator: Simos, N.; Ludewig, H.; Catalan-Lasheras, N.; Brodowski, J. & Wei, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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