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Space-charge compensation in high-intensity proton rings

Description: Recently, it was proposed to use negatively charged electron beams for compensation of beam-beam effects due to protons in the Tevatron collider. The authors show that a similar compensation is possible in space-charge dominated low energy proton beams. The idea has a potential of several-fold increase of the FNAL Booster beam brightness. Best results will be obtained using three electron lenses around the machine circumference, using co-moving electron beam with time structure and profile appr… more
Date: September 21, 2000
Creator: A. Burov, G.W. Foster and V.D. Shiltsev
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Production and Testing Experience with the SRF Cavities for the CEBAF 12 GeV Upgrade

Description: The CEBAF recirculating CW electron linear accelerator at Jefferson Lab is presently undergoing a major upgrade to 12 GeV. This project includes the fabrication, preparation, and testing of 80 new 7-cell SRF cavities, followed by their incorporation into ten new cryomodules for subsequent testing and installation. In order to maximize the cavity Q over the full operable dynamic range in CEBAF (as high as 25 MV/m), the decision was taken to apply a streamlined preparation process that includes a… more
Date: September 1, 2011
Creator: A. Burrill, G.K. Davis, F. Marhauser, C.E. Reece, A.V. Reilly, M. Stirbet
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Muon LINAC for the International Design Study of the Neutrino Factory

Description: The first stage of muon acceleration in the Neutrino Factory utilises a superconducting linac to accelerate muons from 244 MeV to 900 MeV. The linac was split into three types of cryomodules with decreasing magnetic fields and increasing amounts of RF voltage but with the design of the superconducting solenoid and RF cavities being the same for all cryomodules. The current status of the muon linac for the International Design Study for the Neutrino Factory will be presented including a final la… more
Date: September 1, 2011
Creator: A. Kurup, C. Bontoiu, Morteza Aslaninejad, J. Pozimski, A. Bogacz, V.S. Morozov, Y.R. Roblin, K.B. Beard
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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RF and structural characterization of new SRF films

Description: In the past years, energetic vacuum deposition methods have been developed in different laboratories to improve Nb/Cu technology for superconducting cavities. Jefferson Lab is pursuing energetic condensation deposition via Electron Cyclotron Resonance. As part of this study, the influence of the deposition energy on the material and RF properties of the Nb thin film is investigated. The film surface and structure analyses are conducted with various techniques like X-ray diffraction, Transmissio… more
Date: September 1, 2009
Creator: A.-M. Valente-Feliciano,H. L. Phillips,C. E. Reece,X. Zhao,D. Gu,R. Lukaszew,B. Xiao,K. Seo
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effects of the Thickness of Niobium Surface Oxide Layers on Field Emission

Description: Field emission on the inner surfaces of niobium superconducting radio frequency cavities is still one of the major obstacles for reaching high accelerating gradients for SRF community. Our previous experimental results* seemed to imply that the threshold of field emission was related to the thickness of Nb surface oxide layers. In this contribution, a more detailed study on the influences of the surface oxide layers on the field emission on Nb surfaces will be reported. By anodization technique… more
Date: September 1, 2011
Creator: A.T. Wu, S. Jin, J.D. Mammosser, R.A. Rimmer, X.Y. Lu, K. Zhao
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fastest Electropolishing Technique on Niobium for Particle Accelerators

Description: Field emission on the inner surfaces of niobium (Nb) superconducting radio frequency (SRF) cavities is still one of the major obstacles for reaching high accelerating gradients for SRF community. Our previous experimental results [1] seemed to imply that the threshold of field emission was related to the thickness of Nb surface oxide layers. In this contribution, a more detailed study on the influences of the surface oxide layers on the field emission on Nb surfaces will be reported. By anodiza… more
Date: September 1, 2011
Creator: A.T. Wu, S. Jin, R.A. Rimmer, X.Y. Lu, K. Zhao
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Location Algorithms and Errors in Time-of-Arrival Systems

Description: This report describes least squares solution methods and linearized estimates of solution errors caused by data errors. These methods are applied to event locating systems which use time-of-arrival (TOA) data. Analyses are presented for algorithms that use the TOA data in a ''direct'' manner and for algorithms utilizing Time-of-arrival Squared (TSQ) methods. Location and error estimation results were applied to a ''typical'' satellite TOA detecting system. Using Monte Carlo methods, it was foun… more
Date: September 1, 2001
Creator: AARONSON, EUGENE A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

[News Release: New Board Member]

Description: A news release from the AIDS Interfaith Network about Rev. Charles Carnhan being elected to the Board of Directors of the AIDS National Interfaith Network.
Date: September 24, 1990
Creator: AIDS Interfaith Network
Item Type: Refine your search to only Text
Partner: UNT Libraries Special Collections
open access

[News Release: AIDS Interfaith Network]

Description: A news release from the AIDS Interfaith Network Inc. about being recognized as a model ministry to people with HIV/AIDS at the 2nd annual Conference held in Chicago.
Date: September 24, 1990
Creator: AIDS Interfaith Network Inc.
Item Type: Refine your search to only Text
Partner: UNT Libraries Special Collections
open access

AntiReflection Coating D

Description: Analytical expressions used to optimize AR coatings for single junction solar cells are extended for use in monolithic, series interconnected multi-junction solar cell AR coating design. The result is an analytical expression which relates the solar cell performance (through J{sub sc}) directly to the AR coating design through the device reflectance. It is also illustrated how AR coating design be used to provide an additional degree of freedom for current matching multi-junction devices.
Date: September 23, 1999
Creator: AIKEN,DANIEL J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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