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LCLS XTOD Attenuator System System Concept Report

Description: The attenuator system for the Linac Coherent Light Source (LCLS) X-ray Transport, Optics and Diagnostics (XTOD) system has been configured and analyzed by the Lawrence Livermore National Laboratory's New Technologies Engineering Division (NTED) as requested by the SLAC/LCLS program. The system layout, performance analyses and selection of the vacuum components are presented in this System Conceptual Review (SCR) report. Also included are the plans for prototype, procurement, mechanical integrat… more
Date: April 12, 2006
Creator: Kishiyama, K.; Roeben, M.; Trent, J.; Ryutov, D. & Shen, S.
Partner: UNT Libraries Government Documents Department
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Realizing the Opportunities of Neutron Cross Section Measurements at RIA

Description: The Rare Isotope Accelerator will produce many isotopes at never before seen rates. This will allow for the first time measurements on isotopes very far from stability and new measurement opportunities for unstable nuclei near stability. In fact, the production rates are such that it should be possible to collect 10 micrograms of many isotopes with a half-life of 1 day or more. This ability to make targets of short-lived nuclei enables the possibility of making neutron cross-section measurement… more
Date: October 13, 2004
Creator: Ahle, L; Hausmann, M; Reifarth, R; Roberts, K; Roeben, M; Rusnak, B et al.
Partner: UNT Libraries Government Documents Department
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The Need for a Neutron Source at the Rare Isotope Accelerator

Description: An intense neutron source facility with radiochemical processing capability is necessary at the Rare Isotope Accelerator to fully realize its potential benefit to stockpile stewardship and astrophysics. While many of the important physics missions of RIA can be addressed with radioactive ion beams, direct neutron cross-section measurements of interest to stockpile stewardship and astrophysics cannot because one cannot make a neutron target. Thus, one must collect a sufficient amount of the appr… more
Date: May 13, 2005
Creator: Ahle, L. E.; Rusnak, B.; Roberts, K. E.; Roeben, M. D.; Hausmann, M.; Reifarth, R. et al.
Partner: UNT Libraries Government Documents Department
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The GEM Detector projective alignment simulation system

Description: Precision position knowledge (< 25 microns RMS) of the GEM Detector muon system at the Superconducting Super Collider Laboratory (SSCL) is an important physics requirement necessary to minimize sagitta error in detecting and tracking high energy muons that are deflected by the magnetic field within the GEM Detector. To validate the concept of the sagitta correction function determined by projective alignment of the muon detectors (Cathode Strip Chambers or CSCs), the basis of the proposed GEM a… more
Date: July 9, 1993
Creator: Wuest, C. R.; Belser, F. C.; Holdener, F. R.; Roeben, M. D.; Paradiso, J. A.; Mitselmakher, G. et al.
Partner: UNT Libraries Government Documents Department
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The Physics of the Gas Attenuator for the Linac Coherent Light Source (LCLS)

Description: A systematic assessment of a variety of physics issues affecting the performance of the LCLS X-ray beam attenuator is presented. Detailed analysis of the gas flow in the gas attenuator and in the apertures is performed. A lot of attention is directed towards the gas ionization and heating by intense X-ray pulses. The role of these phenomena in possible deviations of the attenuation coefficient from its 'dialed in' value is evaluated and found small in most cases. Other sources of systematic and… more
Date: February 7, 2011
Creator: Ryutov, D. D.; Bionta, R. M.; Hau-Riege, S. P.; Kishiyama, K. I.; McMahon, D.; Roeben, M. D. et al.
Partner: UNT Libraries Government Documents Department
open access

Operating the LCLS Gas Attenuator and Gas Detector System with Apertures of 6mm Diameter

Description: The possibility of increasing the apertures of the LCLS gas attenuator/gas detector system is considered. It is shown that increase of the apertures from 3 to 6 mm, together with 4-fold reduction of the operation pressure does not adversely affect the vacuum conditions upstream or downstream. No change of the pump speed and the lengths of the differential pumping cells is required. One minor modification is the use of 1.5 cm long tubular apertures in the end cells of the differential pumping sy… more
Date: November 17, 2010
Creator: Ryutov, D. D.; Bionta, R. M.; Hau-Riege, S. P.; Kishiyama, K. I.; Roeben, M. D.; Shen, S. et al.
Partner: UNT Libraries Government Documents Department
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