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Nb3Sn for Radio Frequency Cavities

Description: In this article, the suitability of Nb3Sn to improve theperformance of superconducting Radio-Frequency (RF)cavities is discussed.The use of Nb3Sn in RF cavitiesis recognized as an enabling technology toretain a veryhigh cavity quality factor (Q0) at 4.2 K and tosignificantly improve the cavity accelerating efficiency per unitlength(Eacc). This potential arises through the fundamental properties ofNb3Sn. The properties that are extensively characterized in theliterature are, however, mainly rela… more
Date: December 18, 2006
Creator: Godeke, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High-gradient normal-conducting RF structures for muon cooling channels

Description: We present a status report on the research and development of high-gradient normal-conducting RF structures for the ionization cooling of muons in a neutrino factory or muon collider. High-gradient RF structures are required in regions enclosed in strong focusing solenoidal magnets, precluding the application of superconducting RF technology [1]. We propose using linear accelerating structures, with individual cells electromagnetically isolated, to achieve the required gradients of over 15 MV/m… more
Date: June 12, 2001
Creator: Corlett, J.N.; Green, M.A.; Hartman, N.; Ladran, A.; Li, D.; MacGill, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Detection of Short Circuits in Thermocouples by a Radio-Frequency Measurement of Inductance

Description: Abstract: "The development of a portable battery-operated instrument capable of detecting a short-circuit four or more inches from the hot junction of a five-foot-long thermocouple is described. The accuracy of measurement is inversely proportional to the length of the thermocouple and is not affected by changes in thermocouple temperature. A signal having a wave length much greater than the electrical length of the thermocouple is used to measure thermocouple inductance. The instrument consist… more
Date: 1956
Creator: Morris, Peter R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Integrated Predictive Models for ICRF-Edge Plasma Interactions

Description: The coupling of radiofrequency waves to the edge plasma of a fusion device produces strong nonlinear interactions with the plasma and surrounding material walls which must be controlled in order to protect the antenna and to obtain efficient heating of the core plasma. The goal of the STTR project was to develop the first quantitative numerical simulation of this problem. This report describes the results of the Phase I work by Lodestar and ORNL on this project.
Date: July 20, 2005
Creator: D'Ippolito, Daniel A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Transient beam loading in the ALS harmonic RF system

Description: We report on the commissioning of a higher harmonicradiofrequency system at the Advanced Light Source, designed to improvethe beam lifetime. We have achieved an increase above a factor of two inour best results up to now. Transient beam loading of the harmoniccavities, due to the unequal fill patterns, creates the greatestlimitation on lifetime improvement. We also describe several interestingeffects on the operation of the longitudinal and transverse multibunchfeedback system.
Date: June 1, 2000
Creator: Byrd, J.; De Santis, S.; Georgsson, M.; Stover, G.; Fox, J.; Prabhakar, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Internal Bunching in the Alternating Gradient Synchrotron (AGS)

Description: Four methods of rebunching protons within Brookhaven's AGS are discussed. The first method involving switching off the old r-f and switching on the new r-f simultaneously with the new r-f increasing adiabatically seems impractical. Two other methods utilize gradual removal of the old r-f voltage and introduction of the new r-f voltage, or the reverse. Removal of the old r-f voltage followed by introduction of the new seems to give the best results. Several phase diagrams are included. (D.C.W.)
Date: January 16, 1961
Creator: Robertson, D. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The rf experimental program in the fermilab mucool test area

Description: The rf R&D program for high-gradient, low frequency cavities to be used in muon cooling systems is underway in the Fermilab MUCOOL Test Area. Cavities at 805 and 201 MHz are used for tests of conditioning techniques, surface modification and breakdown studies. This work has the Muon Ionization Cooling Experiment (MICE) as its immediate goal and efficient muon cooling systems for neutrino sources and muon colliders as the long term goal. We study breakdown and dark current production under a… more
Date: May 20, 2005
Creator: Norem, J.; Sandstrom, R.; Bross, A.; Moretti, A.; Qian, Z.; Torun, Y. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Synchronization of x-ray pulses to the pump laser in an ultrafast x-ray facility

Description: Accurate timing of ultrafast x-ray probe pulses emitted from a synchrotron radiation source with respect to a pump laser exciting processes in the sample under study is critical for the investigation of structural dynamics in the femtosecond regime. We describe a scheme for synchronizing femtosecond x-ray pulses relative to a pump laser. X-ray pulses of <100 fs duration are generated from a proposed source based on a recirculating superconducting linac [1,2,3]. Short x-ray pulses are obtaine… more
Date: May 30, 2002
Creator: Corlett, J.N.; Barry, W.; Byrd, J.M.; Schoenlein, R. & Zholents, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Rf System of the Bevatron

Description: Report discussing details of the design for the Bevatron at the University of California Radiation Laboratory. The Bevatron is a "6-billion-electron-volt (Bev) proton synchotron. This device will receive a 10-million-electron-volt (Mev) proton beam from a linear accelerator, and further accelerate a reasonable percentage of these protons, at a nominally constant radius of 600 inches, to a final energy greater than 6 Bev."
Date: June 4, 1954
Creator: Winningstad, C. Norman
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Radiofrequency Use and Management: Impacts From the World Administrative Radio Conference of 1979

Description: A study by the Office of Technology Assessment (OTA) that examines the Final Acts of the General World Administrative Radio Conference (WARC-79) "in a comprehensive way-describing U.S. preparations and involvement, and the impact of the conference" (p. 3).
Date: January 1982
Creator: United States. Congress. Office of Technology Assessment.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Characteristics of a RF-Driven Ion Source for a Neutron Generator Used For Associated Particle Imaging

Description: We present recent work on a prototype compact neutron generator for associated particle imaging (API). API uses alpha particles that are produced simultaneously with neutrons in the deuterium-tritium (2D(3T,n)4 alpha) fusion reaction to determine the direction of the neutrons upon exiting the reaction. This method determines the spatial position of each neutron interaction and requires the neutrons to be generated from a small spot in order to achieve high spatial resolution. The ion source for… more
Date: August 8, 2008
Creator: Wu, Ying; Hurley, John P.; Ji, Qing; Kwan, Joe & Leung, Ka-Ngo
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Recirculating Linac Based Synchrotron Light Source for Ultrafast X-Ray Science

Description: LBNL is pursuing a multi-divisional initiative that has this year further developed design studies and the scientific program for a facility dedicated to the production of x-ray pulses with ultra-short time duration. Our proposed x-ray facility [1] has the short x-ray pulse length ({approx};60 fs FWHM) necessary to study very fast dynamics, high flux (approximately 1011 photons/sec/0.1 percentBW) to study weakly scattering systems, and tuneability over 1-10 keV photon energy. The photon product… more
Date: May 30, 2002
Creator: Corlett, J.N.; Barry, W.; Byrd, J.M.; DeSantis, S.; Heimann, P.; Lidia, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Models for Automated Tube Performance Calculations

Description: High power radio-frequency systems, as typically used in fusion research devices, utilize vacuum tubes. Evaluation of vacuum tube performance involves data taken from tube operating curves. The acquisition of data from such graphical sources is a tedious process. A simple modeling method is presented that will provide values of tube currents for a given set of element voltages. These models may be used as subroutines in iterative solutions of amplifier operating conditions for a specific loadin… more
Date: December 12, 2002
Creator: Brunkhorst, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Commissioning of a Higher Harmonic RF System for the Advanced Light Source

Description: We report on the commissioning of a higher harmonic RF system designed to improve the Touschek lifetime of the Advanced Light Source. In our best results, we have achieved over a factor of two increase in the beam lifetime. Transient beam loading of the harmonic cavities by unequal fill patterns presents the greatest limitations on lifetime improvement. We also describe several interesting effects of the harmonic cavities on the operation of the longitudinal and transverse multibunch feedback s… more
Date: March 31, 2000
Creator: Byrd, John M.; De Santis, Stefano; Georgsson, Mattias; Stover,G.; Fox, John D. & Teytelman, Dmitry
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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