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Commissioning Results of Slow Extraction of Heavy Ions From the AGS Booster.

Description: Brookhaven's AGS Booster has been modified to deliver slow extracted beam to a new beam line, the NASA Space Radiation Laboratory (NSRL). This facility was constructed in collaboration with NASA for the purpose of performing radiation effect studies for the NASA space program. The design of the resonant extraction system has been described in [1]. A more detailed description, which includes predictions of the slow extracted beam time structure has been described in [2]. In this report we w… more
Date: May 12, 2003
Creator: Brown, K. A.; Bellavia, S.; Binello, S.; Brelsford, B.; Dumont, D.; Eng, W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Status of RHIC head-on beam-beam compensation project

Description: Two electron lenses are under construction for RHIC to partially compensate the head-on beam-beam effect in order to increase both the peak and average luminosities. The final design of the overall system is reported as well as the status of the component design, acquisition, and manufacturing. An overview of the RHIC head-on beam-beam compensation project is given in [1], and more details in [2]. With 2 head-on beam-beam interactions in IP6 and IP8, a third interaction with a low-energy electr… more
Date: March 28, 2011
Creator: Fischer, W.; Anerella, M.; Beebe, E.; Bruno, D.; Gassner, D.M.; Gu, X. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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RHIC electron lens test bench diagnostics

Description: An Electron Lens (E-Lens) system will be installed in RHIC to increase luminosity by counteracting the head-on beam-beam interaction. The proton beam collisions at the RHIC experimental locations will introduce a tune spread due to a difference of tune shifts between small and large amplitude particles. A low energy electron beam will be used to improve luminosity and lifetime of the colliding beams by reducing the betatron tune shift and spread. In preparation for the Electron Lens installatio… more
Date: May 16, 2011
Creator: Gassner, D.; Beebe, E.; Fischer, W.; Gu, X.; Hamdi, K.; Hock, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effect of the electron lenses on the RHIC proton beam closed orbit

Description: We are designing two electron lenses (E-lens) to compensate for the large beam-beam tune spread from proton-proton interactions at IP6 and IP8 in the Relativistic Heavy Ion Collider (RHIC). They will be installed at RHIC IR10. The transverse fields of the E-lenses bending solenoids and the fringe field of the main solenoids will shift the proton beam. We calculate the transverse kicks that the proton beam receives in the electron lens via Opera. Then, after incorporating the simplified E-lens l… more
Date: February 1, 2011
Creator: Gu, X.; Luo, Y.; Pikin, A.; Okamura, M.; Fischer, W.; Montag, C. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The effects of the RHIC E-lenses magnetic structure layout on the proton beam trajectory

Description: We are designing two electron lenses (E-lens) to compensate for the large beam-beam tune spread from proton-proton interactions at IP6 and IP8 in the Relativistic Heavy Ion Collider (RHIC). They will be installed in RHIC IR10. First, the layout of these two E-lenses is introduced. Then the effects of e-lenses on proton beam are discussed. For example, the transverse fields of the e-lens bending solenoids and the fringe field of the main solenoids will shift the proton beam. For the effects of t… more
Date: March 28, 2011
Creator: Gu, X.; Pikin, A.; Luo, Y.; Okamura, M.; Fischer, W.; Gupta, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Designing a beam transport system for RHIC's electron lens

Description: We designed two electron lenses to apply head-on beam-beam compensation for RHIC; they will be installed near IP10. The electron-beam transport system is an important subsystem of the entire electron-lens system. Electrons are transported from the electron gun to the main solenoid and further to the collector. The system must allow for changes of the electron beam size inside the superconducting magnet, and for changes of the electron position by 5 mm in the horizontal- and vertical-planes.
Date: March 28, 2011
Creator: Gu, X.; Pikin, A.; Okamura, M.; Fischer, W.; Luo, Y.; Gupta, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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RHIC electron lens beam transport system design considerations

Description: To apply head-on beam-beam compensation for RHIC, two electron lenses are designed and will be installed at IP10. Electron beam transport system is one of important subsystem, which is used to transport electron beam from electron gun side to collector side. This system should be able to change beam size inside superconducting magnet and control beam position with 5 mm in horizontal and vertical plane. Some other design considerations for this beam transport system are also reported in this pap… more
Date: October 1, 2010
Creator: Gu, X.; Pikin, A.; Okamura, M.; Fischer, W.; Luo, Y.; Gupta, R. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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THE AGS ELECTROSTATIC SEPTUM.

Description: The previous slow beam extraction electro static septum in the AGS was designed in 1981. Research documented at the Fermi Laboratory was used as the base line for this design. The septum consisted of a ground plane of .002 inch diameter wire tungsten-rhenium alloy (75%W 25%Re) with a hollow welded titanium cathode assembly. The vacuum chamber is stationary and the septum is moved with a pair of high vacuum linear feed throughs. After years of beam time, the frequency of failures increased. The … more
Date: May 12, 2003
Creator: HOCK,J. RUSSO,T. GLEN,J. BROWN,K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Comparing energy technology alternatives from an environmental perspective

Description: A number of individuals and organizations advocate the use of comparative, formal analysis to determine which are the safest methods for producing and using energy. Some have suggested that the findings of such analyses should be the basis upon which final decisions are made about whether to actually deploy energy technologies. Some of those who support formal comparative analysis are in a position to shape the policy debate on energy and environment. An opposing viewpoint is presented, arguing… more
Date: February 1, 1981
Creator: House, P W; Coleman, J A; Shull, R D; Matheny, R W & Hock, J C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Structure and design of the electron lens for RHIC

Description: Two electron lenses for a head-on beam-beam compensation are being planned for RHIC; one for each circulating proton beam. The transverse profile of the electron beam will be Gaussian up to a maximum radius of r{sub e} = 3{sigma}. Simulations and design of the electron gun with Gaussian radial emission current density profile and of the electron collector are presented. Ions of the residual gas generated in the interaction region by electron and proton beams will be removed by an axial gradient… more
Date: March 28, 2011
Creator: Pikin, A.; Fischer, W.; Alessi, J.; Anerella, M.; Beebe, E. Gassner, D.; Gu, X. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design of a proton-electron beam overlap monitor for the new RHIC electron lens, based on detecting energetic backscattered electrons

Description: The optimal performance of the two electron lenses that are being implemented for high intensity polarized proton operation of RHIC requires excellent collinearity of the {approx}0.3 mm RMS wide electron beams with the proton bunch trajectories over the {approx}2m interaction lengths. The main beam overlap diagnostic tool will make use of electrons backscattered in close encounters with the relativistic protons. These electrons will spiral along the electron guiding magnetic field and will be d… more
Date: April 15, 2012
Creator: T., Thieberger; Beebe, E.; Fischer, W.; Gassner, D.; Gu, X.; Hamdi, K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Proposed electron halo detector system as one of the beam overlap diagnostic tools for the new RHIC electron lens

Description: An electron lens for head-on beam-beam compensation planned for RHIC requires precise overlap of the electron and proton beams which both can have down to 0.3 mm rms transverse radial widths along the 2m long interaction region. Here we describe a new diagnostic tool that is being considered to aid in the tuning and verification of this overlap. Some of ultra relativistic protons (100 or 250 GeV) colliding with low energy electrons (2 to 10 keV) will transfer sufficient transverse momentum to c… more
Date: March 28, 2011
Creator: Thieberger, P.; Alessi, J.; Beebe, E.; Chasman, C.; Fischer, W.; Gassner, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A split-electrode for clearing scattered electrons in the RHIC e-lens

Description: We are designing two electron lenses that will be installed at RHIC IR10 to compensate for the head-on beam-beam effect. To clear accumulated scattered electrons from 100 GeV proton-electron head-on collisions in the e-lens, a clearing split electrode may be constructed. The feasibility of this proposed electrode was demonstrated via the CST Particle Studio and Opera program simulations. By splitting one of the drift tubes in the e-lens and applying {approx} 380 V across the two parts, the scat… more
Date: May 20, 2012
Creator: X., Gu; Pikin, A.; Thieberger, P.; Fischer, W.; Hock, J.; Hamdi, K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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