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Vibration study of the APS storage ring 0. 8 meter quadrupole magnet/magnet support assembly

Description: The objectives of this study are as follows: Determine the vibration characteristics (frequency, damping, and mode shapes) of the magnet on prototypic supports (the actual mounting system used to mount the magnet on the girder). Measure system response to ambient floor motion. Measure the effect of various modifications to determine if the magnet response can be modified to minimize unwanted response characteristics. Modifications investigated include support schemes, increasing system damping,… more
Date: June 1, 1991
Creator: Jendrzejczyk, J.A.; Wambsganss, M.W. & Smith, R.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Magnet innovations for linacs

Description: It is possible to produce large magnetic fields at the aperture of permanent magnet quadrupoles, even when the magnetic aperture is very small. That, combined with their compactness, makes permanent magnet quadrupoles very powerful components of small aperture linacs. Results will be presented about past and present work on both fixed and variable strength permanent magnets suitable for use in and around linacs.
Date: June 1, 1986
Creator: Halbach, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Measurements of magnetization multipoles in four centimeter quadrupoles for the SSC

Description: Higher multipoles due to magnetization of the superconductor in superconducting dipole and quadrupole magnets has been observed in over twenty years. This report presents measurements of the 12 pole and 20 pole multipoles in a model one-meter long four-centimeter bore SSC type quadrupole built at the Lawrence Berkeley Laboratory (LBL). The measurements were compared with calculations of the field structure using magnetization theory. Good agreement was observed between the measured multipoles a… more
Date: June 1, 1991
Creator: Green, M. A.; Barale, P. J.; Benjegerdes, R. W.; Gilbert, W. S.; Green, M. I.; Scanlan, R. M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Magnet R&D for the US LHC Accelerator Research Program (LARP)

Description: In 2004, the US DOE established the LHC Accelerator Research Program (LARP) with the goal of developing a technology base for future upgrades of the LHC. The focus of the magnet program, which is a collaboration of three US laboratories, BNL, FNAL and LBNL, is on development of high gradient quadrupoles using Nb{sub 3}Sn superconductor. Other program components address issues regarding magnet design, radiation-hard materials, long magnet scale-up, quench protection, fabrication techniques and c… more
Date: June 1, 2006
Creator: Gourlay, S. A.; Ambrosio, G.; Andreev, N.; Anerella, M.; Barzi, E.; Bossert, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Vibration Measurements to Study the Effect of Cryogen Flow in Superconducting Quadrupole.

Description: The conceptual design of compact superconducting magnets for the International Linear Collider final focus is presently under development. A primary concern in using superconducting quadrupoles is the potential for inducing additional vibrations from cryogenic operation. We have employed a Laser Doppler Vibrometer system to measure the vibrations in a spare RHIC quadrupole magnet under cryogenic conditions. Some preliminary results of these studies were limited in resolution due to a rather lar… more
Date: June 25, 2007
Creator: He, P.; Anerella, M.; Aydin, S.; Ganetis, G.; Harrison, M.; Jain, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design and Construction of the PEP-II Low Energy Ring

Description: We describe the design and construction status of theLow-Energy Ring (LER) of the PEP-II project, a collaboration of SLAC,LBNL, and LLNL. In the past year we have optimized LER parameters andstarted component fabrication. By reusing the original wigglers, we wereable to simplify the design of the distributed wiggler photon dump, whichmust dissipate 260 kW of power. The number of RF stations (eachcomprising a klystron powering two 476-MHz cavities) was reduced from 4to 3. We have begun fabricati… more
Date: June 1, 1996
Creator: Hsieh, H.; Yourd, R. & Zisman, M. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Uncoupled achromatic tilted S-bend

Description: A particular section of the electron beam transport line, to be used in the e-cooling project [l] of the Relativistic Heavy Ion Collider (RHIC), is constrained to displace the trajectory with both horizontal and vertical offsets so that the outgoing beamline is parallel to the incoming beamline. We also require that section be achromatic in both planes. This mixed horizontal and vertical achromatic Sbend is accomplished by rotating the two dipoles and the quadrupoles of the line, about the long… more
Date: June 23, 2008
Creator: Tsoupas, N.; Kayran, D.; Litvinenko, V. & MacKay, W. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Production, Characterization, and Acceleration of Optical Microbunches

Description: Optical microbunches with a spacing of 800 nm have been produced for laser acceleration research. The microbunches are produced using a inverse Free-Electron-Laser (IFEL) followed by a dispersive chicane. The microbunched electron beam is characterized by coherent optical transition radiation (COTR) with good agreement to the analytic theory for bunch formation. In a second experiment the bunches are accelerated in a second stage to achieve for the first time direct net acceleration of electron… more
Date: June 20, 2008
Creator: Sears, Christopher M.S. & /SLAC, /Stanford U.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Electrons in a positive-ion beam with solenoid or quadrupole magnetic transport

Description: The High Current Experiment (HCX) is used to study beam transport and accumulation of electrons in quadrupole magnets and the Neutralized Drift-Compression Experiment (NDCX) to study beam transport through and accumulation of electrons in magnetic solenoids. We find that both clearing and suppressor electrodes perform as intended, enabling electron cloud densities to be minimized. Then, the measured beam envelopes in both quadrupoles and solenoids agree with simulations, indicating that theoret… more
Date: June 4, 2007
Creator: Molvik, A. W.; Kireeff Covo, M.; Cohen, R.; Coleman, J.; Sharp, W.; Bieniosek, F. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development and Test of TQC models, LARP Technological Quadrupole Magnets

Description: In support of the development of a large-aperture Nb3Sn superconducting quadrupole for the Large Hadron Collider (LHC) luminosity upgrade, two-layer quadrupole models (TQC and TQS) with 90mm aperture are being constructed at Fermilab and LBNL within the framework of the US LHC Accelerator Research Program (LARP). This paper describes the development and test of TQC01b, the second TQC model, and the experience during construction of TQE02 and TQC02, subsequent models in the series. ANSYS analysi… more
Date: June 1, 2008
Creator: Bossert, R. C.; Ambrosio, G.; Andreev, N.; Barzi, E.; Carcagno, R.; Feher, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nb3Sn Quadrupoles in the LHC IR Phase I Upgrade

Description: After a number of years of operation at nominal parameters, the LHC will be upgraded for higher luminosity. This paper discusses the possibility of using a limited number of Nb{sub 3}Sn quadrupoles for hybrid optics layouts for the LHC Phase I luminosity upgrades with both NbTi and Nb{sub 3}Sn quadrupoles. Magnet parameters and issues related to using Nb{sub 3}Sn quadrupoles including aperture, gradient, magnetic length, field quality, operation margin, et cetera are discussed.
Date: June 23, 2008
Creator: Zlobin,A.; Johnstone, J.; Kashikhin, V.; Mokhov, N.; Rakhno, I.; deMaria, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design of Nb3Sn Coils for LARP Long Magnets

Description: The LHC Accelerator Research Program (LARP) has a primary goal to develop, assemble, and test full size Nb{sub 3}Sn quadrupole magnet models for a luminosity upgrade of the Large Hadron Collider (LHC). A major milestone in this development is to assemble and test, by the end of 2009, two 4 m-long quadrupole cold masses, which will be the first Nb{sub 3}Sn accelerator magnet models approaching the length of real accelerator magnets. The design is based on the LARP Technological Quadrupoles (TQ),… more
Date: June 1, 2007
Creator: Ferracin, Paolo; Ambrosio, G.; Andreev, N.; Anerella, M.; Barzi, E.; Bossert, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radiation and thermal analysis of superconducting quadrupoles in the interaction region of linear collider

Description: CERN has encouraged the US-LARP collaboration to participate in Phase I of the LHC luminosity upgrade by analyzing the benefits gained by using Nb3Sn technology to replace the functionality of select NbTi magnets that CERN is committed to construct. Early studies have shown that the much higher gradients (shorter magnetic lengths) and temperature margins (quench stability) of Nb3Sn magnets compared to their NbTi counterparts is favorable--allowing the insertion of additional absorbers between Q… more
Date: June 1, 2008
Creator: Drozhdin, A. I.; Kashikhin, V. V.; Kashikhin, V. S.; Lopes, M. L.; Mokhov, N. V.; Zlobin, A. V. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design Studies of Nb3Sn High-Gradient Quadrupole Models for LARP

Description: Insertion quadrupoles with large aperture and high gradient are required to achieve the luminosity upgrade goal of 10{sup 35} cm{sup -2} s{sup -1} at the Large Hadron Collider (LHC). In 2004, the US Department of Energy established the LHC Accelerator Research Program (LARP) to develop a technology base for the upgrade. Nb{sub 3}Sn conductor is required in order to operate at high field and with sufficient temperature margin. We report here on the conceptual design studies of a series of 1 m lo… more
Date: June 1, 2007
Creator: Sabbi, GianLuca; Andreev, Nikolai; Caspi, Shlomo; Dietderich, Daniel; Ferracin, Paolo; Ghosh, Arup et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Assembly and Test of a Support Structure for 3.6 m Long Nb3Sn Racetrack Coils

Description: The LHC Accelerator Research Program (LARP) is currently developing 4 m long Nb{sub 3}Sn quadrupole magnets for a possible upgrade of the LHC Interaction Regions (IR). In order to provide a reliable test bed for the fabrication and test of long Nb{sub 3}Sn coils, LARP has started the development of the long racetrack magnet LRS01. The magnet is composed of two 3.6 m long racetrack coils contained in a support structure based on an aluminum shell pre-tensioned with water-pressurized bladders and… more
Date: June 1, 2008
Creator: Ambrosio, G.; Anerella, M.; Caspi, S.; Cheng, D. W.; Felice, H.; Hafalia, A. R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development and Test of LARP Technological Quadrupole (TQC) Magnet

Description: In support of the development of a large-aperture Nb{sub 3}Sn superconducting quadrupole for the Large Hadron Collider (LHC) luminosity upgrade, two-layer quadrupole models (TQC and TQS) with 90 mm aperture are being constructed at Fermilab and LBNL within the framework of the US LHC Accelerator Research Program (LARP). This paper describes the construction and test of model TQC01. ANSYS calculations of the structure are compared with measurements during construction. Fabrication experience is … more
Date: June 1, 2007
Creator: Feher, S.; Bossert, R. C.; Ambrosio, G.; Andreev, N.; Barzi, E.; Carcagno, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Construction and Test of 3.6 m Nb3Sn Racetrack Coils for LARP

Description: Development of high-performance Nb{sub 3}Sn quadrupoles is one of the major goals of the LHC Accelerator Research Program (LARP). As part of this program, long racetrack magnets were made in order to check the fabrication steps for long Nb{sub 3}Sn coils, that the changes in coil length that take place during reaction and cooldown are correctly accounted for in the quadrupole design, and the use of a long aluminum shell for the support structure. This paper reports the construction of the first… more
Date: June 1, 2008
Creator: Wanderer, P.; Ambrosio, G.; Anerella, M.; Barzi, E.; Bossert, R.; Caspi, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SUPERCONDUCTING MAGNET NEEDS FOR THE ILC.

Description: The ILC Reference Design Report was completed early in February 2007. The Magnet Systems Group was formed to translate magnetic field requirements into magnet designs and cost estimates for the Reference Design. As presently configured, the lLC will have more than 13,000 magnetic elements of which more than 2300 will be based on superconducting technology. This paper will describe the major superconducting magnet needs for the ILC as presently determined by the Area Systems Groups, responsible … more
Date: June 25, 2007
Creator: PARKER, B.; TOMPKINS, J. C.; KASHIKHIN, V. I.; PALMER, M. A. & CLARKE, J. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nb3Sn quadrupoles in the LHC IR Phase I upgrade

Description: After a number of years of operation at nominal parameters, the LHC will be upgraded to a higher luminosity. This paper discusses the possibility of using a limited number of Nb{sub 3}Sn quadrupoles for hybrid optics layouts for the LHC Phase I luminosity upgrades with both NbTi and Nb{sub 3}Sn quadrupoles. Magnet parameters and issues related to using Nb{sub 3}Sn quadrupoles including aperture, gradient, magnetic length, field quality, operation margin, et cetera are discussed.
Date: June 1, 2008
Creator: Zlobin, A. V.; Johnstone, J. A.; Kashikhin, V. V.; Mokhov, N. V.; Rakhno, I. L.; De Maria, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

THE SUPERCONDUCTION MAGNETS OF THE ILC BEAM DELIVERY SYSTEM.

Description: The ILC Reference Design Report was completed early in February 2007. The Magnet Systems Group was formed to translate magnetic field requirements into magnet designs and cost estimates for the Reference Design. As presently configured, the ILC will have more than 13,000 magnetic elements of which more than 2300 will be based on superconducting technology. This paper will describe the major superconducting magnet needs for the ILC as presently determined by the Area Systems Groups, responsible … more
Date: June 25, 2007
Creator: PARKER,B.; ANEREELA, M.; ESCALLIE, J.; HE, P.; JAIN, A.; MARONE, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mechanical stability study of type IV cryomodule (ILC prototype)

Description: An ANSYS modal and harmonic finite element analysis (FEA) was performed in order to investigate cryomodule design mechanical stability for the proposed International Linear Collider (ILC). The current cryomodule, designated Type IV or (T4CM), closely follows the Type III TESLA Test Facility (TTF) version used at DESY, with the exception of a proposed location of the superconducting (SC) quadrupole at the center. This analysis considered the stringent stability criteria established for the ILC, … more
Date: June 1, 2007
Creator: McGee, M. W.; Doremus, R. & Wands, C. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Assembly and Tests of SQ02, a Nb3Sn Racetrack Quadrupole Magnet for LARP

Description: The US LHC Accelerator Research Program (LARP) consists of four US laboratories (BNL, FNAL, LBNL, and SLAC) collaborating with CERN to achieve a successful commissioning of the LHC and to develop the next generation of Interaction Region magnets. In 2004, a large aperture Nb{sub 3}Sn racetrack quadrupole magnet (SQ01) has been fabricated and tested at LBNL. The magnet utilized four subscale racetrack coils and was instrumented with strain gauges on the support structure and directly over the co… more
Date: June 1, 2007
Creator: Ferracin, Paolo; Ambrosio, G.; Barzi, E.; Caspi, S.; Dietderich, D. R.; Feher, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Magnetic and Mechanical Analysis of the HQ Model Quadrupole Designs for LARP

Description: Insertion quadrupoles with large bore and high gradient are required to upgrade the luminosity of the Large Hadron Collider (LHC). The US LHC Accelerator Research Program is developing Nb{sub 3}Sn technology for the upgrade. This effort includes a series of 1 m long Technology Quadrupoles (TQ), to demonstrate the reproducibility at moderate field, and High-gradient Quadrupoles (HQ) to explore the magnet performance limits in terms of peak fields, forces and stresses. The HQ models are expected … more
Date: June 1, 2008
Creator: Felice, Helene; Caspi, Shlomo; Ferracin, Paolo; Kashikhin, Vadim; Novitski, Igor; Sabbi, GianLuca et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electrons in a Positive-Ion Beam with Solenoid or Quadrupole Magnet Transport

Description: The High Current Experiment (HCX) is used to study beam transport and accumulation of electrons in quadrupole magnets and the Neutralized Drift-Compression Experiment (NDCX) to study beam transport through and accumulation of electrons in magnetic solenoids. We find that both clearing and suppressor electrodes perform as intended, enabling electron cloud densities to be minimized. Then, the measured beam envelopes in both quadrupoles and solenoids agree with simulations, indicating that theoret… more
Date: June 1, 2007
Creator: Molvik, A. W.; Cohen, R. H.; Friedman, A.; Covo, M. K.; Lund, S. M.; Sharp, W. M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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