The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Marcel Placidi - One of the best experts on this subject based on the ideXlab platform.
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The PEP-N Interaction Region
Proceedings of the IEEE Particle Accelerator Conference, 2001Co-Authors: M. Sullivan, U. Wienands, John T. Seeman, M E Biagini, Marcel PlacidiAbstract:The PEP-N project consists of a small, very low-energy e- storage ring (VLER) located in one of the Interaction-straight Regions of PEP-II. The small ring is brought into collision with the low-energy (3.1 GeV) e+ beam (LER). The center-of-mass energies from this collision are between the φ and J/ψ resonances. We achieve a head-on collision through the use of a central magnetic dipole field that generates a large horizontal bending field. This field is also the central field of the detector. The large energy range of the VLER, in order to maximize the center-of-mass energy range, complicates the collision point geometry. In order to maintain the beam orbits near the collision point two techniques are used. The first is to scale the central dipole field up and down with the energy of the VLER and the second is to use passive shielding to decrease the integral B·dl of the dipole field seen by the VLER. Changes in the orbit of the LER are corrected with local bending magnets. Further details of the Interaction Region geometry as well as design issues that include synchrotron radiation from the high-current positron beam are discussed.
M E Biagini - One of the best experts on this subject based on the ideXlab platform.
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FURTHER PROGRESS ON A DESIGN FOR A SUPER-B Interaction Region*
2009Co-Authors: Michael Sullivan, M E Biagini, J. Seeman, Ulrich Wienands, P. Raimondi, Frascati, E. Paoloni, Pisa Infn, K. Bertsche, Simona BettoniAbstract:We present an improved design for a SuperB Interaction Region. The new design minimizes local bending of the two colliding beams by separating all beam magnetic elements near the Interaction Point (IP). The total crossing angle at the IP is increased from 48 mrad to 60 mrad. The first magnetic element is a six slice Permanent Magnet (PM) quadrupole with an elliptical aperture allowing us to increase the vertical space for the beam. This magnet starts 36 cm from the Interaction Point (IP). This magnet is only seen by the Low-Energy Beam (LEB), the High-Energy Beam (HEB) has a drift space at this location. This allows the preliminary focusing of the LEB which has a smaller beta y* at the IP than the HEB. The rest of the final focusing for both beams is achieved by two super-conducting side-by-side quadrupoles (QD0 and QF1). These sets of magnets are enclosed in a warm bore cryostat located behind the PM quadrupole for the LEB. We describe this design for the Interaction Region.
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AN IMPROVED DESIGN FOR A SUPER-B Interaction Region *
2008Co-Authors: Michael Sullivan, M E Biagini, J. Seeman, Ulrich Wienands, Simona Bettoni, P. Raimondi, Frascati, E. Paoloni, Pisa InfnAbstract:We present an improved design for a Super-B Interaction Region. The new design attempts to minimize the bending of the two colliding beams which results from shared magnetic elements near the Interaction Point (IP). The total crossing angle at the IP is increased from 34 mrad to 50 mrad and the distance from the IP to the first quadrupole is increased. Although the two beams still travel through this shared magnet, these changes allow for a new magnetic field design with a septum which gives the magnet two magnetic centers. This greatly reduces the beam bending from this shared quadrupole and thereby reduces the radiative bhabha background for the detector as well as any beam emittance growth from the bending. We describe the new design for the Interaction Region.
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Preliminary Considerations for the Design of the Interaction Region
arXiv: Accelerator Physics, 2004Co-Authors: M E BiaginiAbstract:The design of an Interaction Region (IR) suitable to reach low values of the beta functions at the Interaction Point (IP) and a high collision frequency is a rather difficult task in a short ring as DAPHNE, where an upgrade of the peak luminosity to 10^34 cm-2s-1 is aimed [1]. In the following, general considerations on the design of such an IR are presented, together with a preliminary design; the final design will however be the result of a joint collaboration between accelerator and detector physicists.
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The PEP-N Interaction Region
Proceedings of the IEEE Particle Accelerator Conference, 2001Co-Authors: M. Sullivan, U. Wienands, John T. Seeman, M E Biagini, Marcel PlacidiAbstract:The PEP-N project consists of a small, very low-energy e- storage ring (VLER) located in one of the Interaction-straight Regions of PEP-II. The small ring is brought into collision with the low-energy (3.1 GeV) e+ beam (LER). The center-of-mass energies from this collision are between the φ and J/ψ resonances. We achieve a head-on collision through the use of a central magnetic dipole field that generates a large horizontal bending field. This field is also the central field of the detector. The large energy range of the VLER, in order to maximize the center-of-mass energy range, complicates the collision point geometry. In order to maintain the beam orbits near the collision point two techniques are used. The first is to scale the central dipole field up and down with the energy of the VLER and the second is to use passive shielding to decrease the integral B·dl of the dipole field seen by the VLER. Changes in the orbit of the LER are corrected with local bending magnets. Further details of the Interaction Region geometry as well as design issues that include synchrotron radiation from the high-current positron beam are discussed.
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A Preliminary Interaction Region Design for a Super B-Factory
Proceedings of the 2005 Particle Accelerator Conference, 1Co-Authors: Michael Sullivan, U. Wienands, M. Donald, S. Ecklund, A. Novokhatski, J. Seeman, M E BiaginiAbstract:The success of the two B-Factories (PEP-II and KEKB) has encouraged us to look at design parameters for a B-Factory with a 30-50 times increase in the luminosity of the present machines to a luminosity of L ∼ 1×1036cm-2sec-1. We present an initial design of an Interaction Region for a “SuperB” accelerator with a crossing angle of ± 14 mrad and include a discussion of the constraints, requirements and concerns that go into designing an Interaction Region for these very high luminosity e+e-machines.
Michael Sullivan - One of the best experts on this subject based on the ideXlab platform.
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Interaction Region DESIGN AND DETECTOR INTEGRATION AT JLAB’S MEIC
2013Co-Authors: Fanglei Lin, Vasiliy Morozov, Yaroslav Derbenev, Paul D. Brindza, Rolf Ent, Pawel Nadel-turonski, Yuhong Zhang, Charles Hyde, Michael SullivanAbstract:The Electron Ion Collider (EIC) will be a next-generation facility for the study of the strong Interaction (QCD). JLabs MEIC is designed for high luminosities of up to 10^34 cm^-2 s^-1. This is achieved in part due to an aggressively small beta-star, which imposes stringent requirements on the collider rings dynamical properties. Additionally, one of the unique features of MEIC is a full-acceptance detector with a dedicated, small-angle, high-resolution detection system, capable of covering a wide range of momenta (and charge-to-mass ratios) with respect to the original ion beam to enable access to new physics. The detector design relies on a number of features, such as a 50 mrad beam crossing angle, large-aperture ion and electron final focusing quads and spectrometer dipoles as well as a large machine-element-free detection space downstream of the final focusing quads. We present an Interaction Region design developed with close integration of the detector and beam dynamical aspects. The dynamical aspect of the design rests on a symmetry-based concept for compensation of non-linear effects. The optics and geometry have been optimized to accommodate the detection requirements and to ensure the Interaction Regions modularity for easiness of integration into the collider ring lattices. As a result, more » the design offers an excellent detector performance combined with the necessary non-linear dynamical properties. « less
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The Interaction Region of PEP-II
2011Co-Authors: Michael Sullivan, S. Debarger, S.d. Ecklund, K. Fant, N. Kurita, M. Nordby, A. Ringwall, K. SkarpaasAbstract:The PEP-II e{sup +}e{sup -} collider turned off last year after a very successful 9 years of running. The accelerator achieved a peak luminosity of 12 x 10{sup 33} cm{sup -2} s{sup -1}, 4 times over the design of 3 x 10{sup 33} cm{sup -2} s{sup -1}. The peak beam currents were quite high; over 3 A for the positron beam and over 2 A for the electron beam. The beams were stored in separate storage rings. The PEP-II design called for a head-on collision at the Interaction point (IP). This was possible because of the asymmetric beam energies (9 on 3.1 GeV) and was achieved using permanent magnet (PM) dipoles. I describe the actual Interaction Region (IR) layout including some of the design constraints that led to the final design and discuss operation issues related to the IR design.
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Solenoid compensation for the superb Interaction Region
2010Co-Authors: Kirk Bertsche, Michael SullivanAbstract:We present an approach for compensating adverse effects of the detector solenoid in the SuperB Interaction Region (IR). We place compensating solenoids around the IR quadrupole magnets to reduce the magnetic fields nearly to zero. This allows more operational headroom for superconducting IR magnets and avoids saturation of ferric IR magnets. We place stronger compensating solenoids between IR magnets to reverse the magnetic field direction. This allows adjusting the total integrated solenoid field to zero, which eliminates coordinate plane rotation and reduces vertical beam displacements in the IR.
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A New Interaction Region Design for the Super-B Factory
2010Co-Authors: Michael Sullivan, Kirk Bertsche, Simona Bettoni, E. Paoloni, Pavel Vobly, Pantaleo RaimondiAbstract:A final focus magnet design that uses super-ferric magnets is introduced for the SuperB Interaction Region. The baseline design has air-core super-conducting quadrupoles. This idea instead uses super-conducting wire in an iron yoke. The iron is in the shape of a Panofsky quadrupole and this allows two quadrupoles to be side-by-side with no intervening iron as long as the gradients of the two quads are equal. This feature allows us to move in as close as possible to the collision point and minimize the beta functions in the Interaction Region. The superferric design has advantages as well as drawbacks and we will discuss these in the paper.
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FURTHER PROGRESS ON A DESIGN FOR A SUPER-B Interaction Region*
2009Co-Authors: Michael Sullivan, M E Biagini, J. Seeman, Ulrich Wienands, P. Raimondi, Frascati, E. Paoloni, Pisa Infn, K. Bertsche, Simona BettoniAbstract:We present an improved design for a SuperB Interaction Region. The new design minimizes local bending of the two colliding beams by separating all beam magnetic elements near the Interaction Point (IP). The total crossing angle at the IP is increased from 48 mrad to 60 mrad. The first magnetic element is a six slice Permanent Magnet (PM) quadrupole with an elliptical aperture allowing us to increase the vertical space for the beam. This magnet starts 36 cm from the Interaction Point (IP). This magnet is only seen by the Low-Energy Beam (LEB), the High-Energy Beam (HEB) has a drift space at this location. This allows the preliminary focusing of the LEB which has a smaller beta y* at the IP than the HEB. The rest of the final focusing for both beams is achieved by two super-conducting side-by-side quadrupoles (QD0 and QF1). These sets of magnets are enclosed in a warm bore cryostat located behind the PM quadrupole for the LEB. We describe this design for the Interaction Region.
M. Sullivan - One of the best experts on this subject based on the ideXlab platform.
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The PEP-N Interaction Region
Proceedings of the IEEE Particle Accelerator Conference, 2001Co-Authors: M. Sullivan, U. Wienands, John T. Seeman, M E Biagini, Marcel PlacidiAbstract:The PEP-N project consists of a small, very low-energy e- storage ring (VLER) located in one of the Interaction-straight Regions of PEP-II. The small ring is brought into collision with the low-energy (3.1 GeV) e+ beam (LER). The center-of-mass energies from this collision are between the φ and J/ψ resonances. We achieve a head-on collision through the use of a central magnetic dipole field that generates a large horizontal bending field. This field is also the central field of the detector. The large energy range of the VLER, in order to maximize the center-of-mass energy range, complicates the collision point geometry. In order to maintain the beam orbits near the collision point two techniques are used. The first is to scale the central dipole field up and down with the energy of the VLER and the second is to use passive shielding to decrease the integral B·dl of the dipole field seen by the VLER. Changes in the orbit of the LER are corrected with local bending magnets. Further details of the Interaction Region geometry as well as design issues that include synchrotron radiation from the high-current positron beam are discussed.
U. Wienands - One of the best experts on this subject based on the ideXlab platform.
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Interaction Region design for a Super-B factroy
2007 IEEE Particle Accelerator Conference (PAC), 2007Co-Authors: Michael Sullivan, U. Wienands, J.t. Seeman, M. Biagini, Pantaleo RaimondiAbstract:We present a preliminary design of an Interaction Region for a Super-B Factory with luminosity of 1times1036 cm-2 sec-1. The collision has a plusmn17 mrad crossing angle and the first magnetic element starts 0.3 m from the collision point. We show that synchrotron radiation backgrounds are controlled and are at least as good as the backgrounds calculated for the PEP-II accelerator. How the beams get into and out of a shared beam pipe is illustrated along with the control of relatively high synchrotron radiation power from the outgoing beams. The high luminosity makes radiative bhabha backgrounds significantly higher than that of the present B-Factories and this must be addressed as the design is further improved.
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The PEP-N Interaction Region
Proceedings of the IEEE Particle Accelerator Conference, 2001Co-Authors: M. Sullivan, U. Wienands, John T. Seeman, M E Biagini, Marcel PlacidiAbstract:The PEP-N project consists of a small, very low-energy e- storage ring (VLER) located in one of the Interaction-straight Regions of PEP-II. The small ring is brought into collision with the low-energy (3.1 GeV) e+ beam (LER). The center-of-mass energies from this collision are between the φ and J/ψ resonances. We achieve a head-on collision through the use of a central magnetic dipole field that generates a large horizontal bending field. This field is also the central field of the detector. The large energy range of the VLER, in order to maximize the center-of-mass energy range, complicates the collision point geometry. In order to maintain the beam orbits near the collision point two techniques are used. The first is to scale the central dipole field up and down with the energy of the VLER and the second is to use passive shielding to decrease the integral B·dl of the dipole field seen by the VLER. Changes in the orbit of the LER are corrected with local bending magnets. Further details of the Interaction Region geometry as well as design issues that include synchrotron radiation from the high-current positron beam are discussed.
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A Preliminary Interaction Region Design for a Super B-Factory
Proceedings of the 2005 Particle Accelerator Conference, 1Co-Authors: Michael Sullivan, U. Wienands, M. Donald, S. Ecklund, A. Novokhatski, J. Seeman, M E BiaginiAbstract:The success of the two B-Factories (PEP-II and KEKB) has encouraged us to look at design parameters for a B-Factory with a 30-50 times increase in the luminosity of the present machines to a luminosity of L ∼ 1×1036cm-2sec-1. We present an initial design of an Interaction Region for a “SuperB” accelerator with a crossing angle of ± 14 mrad and include a discussion of the constraints, requirements and concerns that go into designing an Interaction Region for these very high luminosity e+e-machines.