01 Circular and Linear Colliders
A02 Lepton Colliders
Paper Title Page
TUOBA03 Recent Beam-beam Effects and Luminosity at VEPP-2000 924
 
  • D.B. Shwartz, D.E. Berkaev, A.S. Kasaev, I. Koop, A.N. Kyrpotin, A.P. Lysenko, E. Perevedentsev, V.P. Prosvetov, Yu. A. Rogovsky, A.L. Romanov, A.I. Senchenko, P.Yu. Shatunov, Y.M. Shatunov, I.M. Zemlyansky, Yu.M. Zharinov
    BINP SB RAS, Novosibirsk, Russia
 
  Funding: Work is supported by the Ministry of Education and Science of the Russian Federation, grant N 14.518.11.7003
VEPP-2000's last season was dedicated to the energy range of 160-520 MeV per beam. The application of round colliding beams concept along with the accurate orbit and lattice correction yielded the high peak luminosity of 1.2*1031 cm-2s−1 at 500 MeV with average luminosity of 0.9*1031 cm-2s−1 per run. The total beam-beam tune shift up to 0.174 was achieved in the runs at 392.5 MeV. This corresponds to beam-beam parameter ksi = 0.125 per one interaction point. The injection system is currently being upgraded to allow for the injection at the top energy of VEPP-2000 collider and to eliminate the present lack of positrons.
 
slides icon Slides TUOBA03 [4.475 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUOBA03  
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WEOCA01 Construction Status of SuperKEKB 1877
 
  • N. Ohuchi, K. Akai, H. Koiso
    KEK, Ibaraki, Japan
 
  SuperKEKB consists of 7 GeV electron and 4 GeV positron rings (HER and LER), a newly built positron damping ring and an injector linac. The target luminosity is 8x1035 cm-2s-1, which is 40 times higher than that achieved at KEKB. Construction of SuperKEKB is progressing on schedule, and beam commissioning is scheduled in 2015. Fabrication, treatment and installation of vacuum components, magnets and power supplies, and beam diagnostic and feedback systems are ongoing. Improvement of RF system and strengthening of cooling system for magnets and beam pipes are also underway. Detailed design of the interaction region has been finalized, and final focus superconducting magnets are under production. The damping ring tunnel and buildings has been completed, and installation of the accelerator components started. The upgrade of the injector linac is also progressing. This paper describes construction status of SuperKEKB main rings and the damping ring as well as recent design progress.  
slides icon Slides WEOCA01 [6.360 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEOCA01  
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WEOCA03 DAΦNE Operation with the Upgraded KLOE-2 Detector 1883
 
  • C. Milardi, D. Alesini, M.E. Biagini, M. Boscolo, B. Buonomo, S. Cantarella, A. De Santis, G.O. Delle Monache, G. Di Pirro, A. Drago, L.G. Foggetta, O. Frasciello, A. Gallo, A. Ghigo, F. Guatieri, S. Guiducci, F. Iungo, C. Ligi, G. Mazzitelli, L. Pellegrino, R. Ricci, U. Rotundo, C. Sanelli, G. Sensolini, M. Serio, A. Stecchi, A. Stella, M. Zobov
    INFN/LNF, Frascati (Roma), Italy
  • R. Gargana, A. Michelotti
    Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy
  • D.N. Shatilov
    BINP SB RAS, Novosibirsk, Russia
  • M. Tobiyama
    KEK, Ibaraki, Japan
  • A. Valishev
    Fermilab, Batavia, Illinois, USA
 
  The DAΦNE collider has been successfully commissioned after the experimental detector modification and a major upgrade and consolidation program involving a large part of the accelerator complex. This paper presents the Φ-Factory setup and the achieved performances in terms of beam currents, luminosity, detector background and related aspects.  
slides icon Slides WEOCA03 [2.424 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEOCA03  
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THPRI001 Design of a High Luminosity Tau/Charm Factory 3757
 
  • M.E. Biagini, R. Boni, M. Boscolo, A. Chiarucci, R. Cimino, A. Clozza, E. Di Pasquale, A. Drago, S. Guiducci, C. Ligi, G. Mazzitelli, R. Ricci, C. Sanelli, M. Serio, A. Stella, S. Tomassini
    INFN/LNF, Frascati (Roma), Italy
  • S. Bini, F. Cioeta, D. Cittadino, M. D'Agostino, M. Del Franco, A. Delle Piane, G. Frascadore, R. Gargana, S. Gazzana, S. Incremona, A. Michelotti, L. Sabbatini
    Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy
  • N. Carmignani, S.M. Liuzzo, P. Raimondi
    ESRF, Grenoble, France
  • R. Petronzio
    Università di Roma II Tor Vergata, Roma, Italy
  • M.T.F. Pivi
    IMS Nanofabrication AG, Vienna, Austria
  • G. Schillaci, M. Sedita
    INFN/LNS, Catania, Italy
 
  The design of a high luminosity Tau/Charm Factory has been accomplished by the INFN-LNF Laboratory in Frascati in collaboration with the Consortium Nicola Cabibbo Laboratory. The target luminosity is 1035 cm-2 ses−1 at 4.6 GeV in the center of mass. This design is a natural evolution of the SuperB B-Factory, that was aimed to be built in the Rome Tor Vergata University campus as an Italian Flagship Project. The Tau/Charm design keeps all the features that made SuperB a state-of-the art accelerator, such as the “large Piwinski angle and crab waist sextupoles” collision scheme, the super squeezed beams, and the polarized electron beam. As a plus, it will be possible to collect data at high luminosity in a large energy range (2 to 4.6 GeV c. m.), with a peak luminosity target of 1034 cm-2 ses−1 at 2 GeV. The possibility to extend the Linac for a SASE-FEL facility is also taken into account. A Conceptual Design Report* was published in September 2013. In this paper the design principles and the project features are reviewed.
* Tau/Charm Factory Accelerator Report, INFN Report INFN-13-13/LNF, September 2013, arXiv:1310.6944 [physics.acc-ph]
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI001  
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THPRI002 DAΦNE General Consolidation and Upgrade 3760
 
  • C. Milardi, D. Alesini, S. Bini, B. Buonomo, S. Cantarella, A. De Santis, G.O. Delle Monache, G. Di Pirro, A. Drago, L.G. Foggetta, O. Frasciello, A. Gallo, A. Ghigo, F. Iungo, C. Ligi, L. Pellegrino, R. Ricci, U. Rotundo, C. Sanelli, G. Sensolini, A. Stecchi, A. Stella, M. Zobov
    INFN/LNF, Frascati (Roma), Italy
  • R. Gargana, A. Michelotti
    Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy
 
  In the first six months of 2013 the KLOE detector has been upgraded inserting new detector layers in the inner part of the apparatus, around the interaction region. The long shutdown has been used to undertake a general consolidation program aimed at improving the Φ-Factory operation stability and reliability and, in turn, the collider uptime. In this context several systems have been revised and upgraded, new diagnostic elements have been installed, some critical components have been modified and the interaction region mechanical support structure design has been developed to improve its mechanical stability and to deal with the weight added by the new detector layers.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI002  
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THPRI003 Beam-beam Simulation Study for CEPC 3763
 
  • Y. Zhang
    IHEP, Beijing, People's Republic of China
  • K. Ohmi, D. Zhou
    KEK, Ibaraki, Japan
  • D.N. Shatilov
    BINP SB RAS, Novosibirsk, Russia
 
  CEPC is an Circular Electron Positron Collider proposed to carry out high precision study on Higgs bosons. It is similar to TLEP project , the luminosity and beam lifetime may be determined by the beamstrahlung effect. We try to check the resonability of the machine parameters with weak-strong and strong-strong simulation. At the same time we also do some cross-check between different codes. We wish the work could help determine the beam parameters which could achieve design luminosity.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI003  
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THPRI004 FCC-ee/CepC Beam-beam Simulations with Beamstrahlung 3766
 
  • K. Ohmi
    KEK, Ibaraki, Japan
  • F. Zimmermann
    CERN, Geneva, Switzerland
 
  Beamstrahlung, namely synchrotron radiation emitted during the beam-beam collision, can be an important effect for circular high-energy lepton colliders such as FCC-ee (TLEP). In this paper we study beam-beam effects in the presence of energy spreading and bunch lengthening due to beamstrahlung.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI004  
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THPRI005 The Mechanical and Vibration Studies of the Final Focus Magnet-cryostat for SuperKEKB 3770
 
  • H. Yamaoka, Y. Arimoto, K. Kanazawa, M. Masuzawa, Y. Ohsawa, N. Ohuchi, K. Tsuchiya, Z.G. Zong
    KEK, Ibaraki, Japan
 
  Construction of the SuperKEKB has been progressed in KEK. The target luminosity of the SuperKEKB is 8×1035 cm-2s−1, which is 40 times larger than the KEKB. The vertical beam sizes of electron and positron must be squeezed to the level of 50 nano-meter at the interaction point. The beam final focus system for the SuperKEKB consists of 4-superconducting (SC) quadrupole doublets, 43 SC-correctors, 4 SC-compensation solenoids. The designs of the cryostats in the left and right side with respect to the beam interaction point are being studied with the progress of the magnet designs. In the design works, the support structure of each cryostat, strength of the cryostat components and support rods for supporting cold mass are investigated. As for the vibration issue, vibration properties of the superconducting quadrupole magnets due to the ground motion has been studied. Also vibration properties of the concrete bridges where the two cryostats will be placed in the interaction region were investigated and measured. We will present the cryostat designs and these vibration studies in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI005  
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THPRI006 Dynamic Aperture Study of SuperKEKB with Beam-beam Effect 3773
 
  • A. Morita, H. Koiso, Y. Ohnishi, K. Oide, H. Sugimoto
    KEK, Ibaraki, Japan
 
  The SuperKEKB is an asymmetric-energy double-ring collider to achieve 40 times higher luminosity than that of the KEKB B-factory. The strong non-linearity of both final focusing and beam-beam force, which are required to achieve such high luminosity, reduce dynamic aperture and limit Touschek beam lifetime. In order to achieve long enough beam lifetime for collision operation, we are studying the dynamic aperture under beam-beam effect. The study results of both dynamic aperture and Touschek beam lifetime are reported in this presentation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI006  
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THPRI007 Lattice Optimization of BEPCII Collider Rings 3776
 
  • Y. Zhang, Q. Qin, C.H. Yu
    IHEP, Beijing, People's Republic of China
 
  BEPCII is a double ring e+e collider operating in the tau-charm region. In March 2013, the peak luminosity achieves 7.0·1032 cm-2s-1 with a new lower alphap lattice. The beam-beam parameter is also increased from 0.033 to 0.04 with the new lattice. In this paper we'll review the lattice optimization history briefly and focus on the optimization of the lower alphap lattice.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI007  
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THPRI008 Interaction Region Lattice for FCC-ee (TLEP) 3779
 
  • A.V. Bogomyagkov, E.B. Levichev, P.A. Piminov
    BINP SB RAS, Novosibirsk, Russia
 
  Funding: The work is supported by the Ministry of Education and Science of the Russian Federation.
FCC-ee (TLEP)* project is a high-luminosity e+e- collider and is an essential part of the Future Circular Collider (FCC) design study at CERN . FCC-ee is being designed to reach center-of-mass energy from 90 to 350 GeV with circumference of 80-100 km to study Higgs boson properties and perform precise measurements at the electroweak scale. It is also an intermediate step towards 100 TeV proton-proton collider built in the same tunnel. Some of the limiting factors of the new collider are total energy loss due to synchrotron radiation, beam lifetime degradation owing to beamstrahlung, geometry of the tunnel required to accommodate the successor. The present paper describes linear lattice of interaction region and results of nonlinear beam dynamics study.
* M.~Koratzinos et al., ‘‘TLEP: A HIGH-PERFORMANCE CIRCULAR e+e COLLIDER TO STUDY THE HIGGS BOSON'', IPAC2013, Shanghai, China, TUPME040 (2013)
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI008  
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THPRI010 FCC-ee Final Focus with Chromaticity Correction 3782
SUSPSNE005   use link to see paper's listing under its alternate paper code  
 
  • H. Garcia, R. Tomás, R. Tomás
    CERN, Geneva, Switzerland
 
  A 100 km circular electron-positron collider is considered as one of the possible future high energy facilities. In order to achieve a high luminosity, strong beam focusing at the Interaction Point is used requiring the correction of the chromatic aberrations. In this paper we study preliminary designs of a Final Focus System for the TLEP collider with chromatic correction. Beam orbit stability and dynamic aperture calculations are also presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI010  
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THPRI011 Beam-machine Interaction at TLEP: First Evaluation and Mitigation of the Synchrotron Radiation Impact 3785
 
  • L. Lari, F. Cerutti, A. Ferrari, A. Mereghetti
    CERN, Geneva, Switzerland
  • L. Lari
    IFIC, Valencia, Spain
  • A. Mereghetti
    UMAN, Manchester, United Kingdom
 
  In the framework of post-LHC accelerator studies, TLEP is a proposed high-luminosity circular e+e collider, aimed at measuring the properties of the Higgs-boson H(126) with unprecedented accuracy, as well as those of the W boson, the Z boson and the top quark. In order to calculate the impact of synchrotron radiation, the latter has been implemented in the FLUKA code as new source term. A first account of escaping power as a function of the vacuum chamber shielding thickness, photoneutron production, and activation has been obtained for the 80km circumference 175 GeV (beam energy) TLEP option. Starting from a preliminary layout of the FODO cell and a possible dipole design, energy deposition simulations have been carried out, investigating the effectiveness of absorbers in the interconnections. The results provide inputs to improve the cell design and to support mechanical integration studies.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI011  
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THPRI012 Tuning of the Compact Linear Collider Beam Delivery System 3788
 
  • Y.I. Levinsen, G. Giambelli, A. Latina, R. Tomás
    CERN, Geneva, Switzerland
  • H. Garcia
    UPC, Barcelona, Spain
  • J. Snuverink
    JAI, Egham, Surrey, United Kingdom
 
  Tuning the CLIC Beam Delivery System (BDS), and in particular the final focus, is a challenging task. In simulations without misalignments, the goal is to reach 120~\% of the nominal luminosity target, in order to allow for 10~\% loss due to static imperfections, and another 10~\% loss from dynamic imperfections. Various approaches have been considered to correct the magnet misalignments, including 1-1 correction, dispersion free steering (DFS), and several minimization methods utilizing multipole movers. In this paper we report on the recent advancements towards a feasible tuning approach that reach the required luminosity target in a reasonable time frame.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI012  
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THPRI013 A Beam Driven Plasma-wakefield Linear Collider from Higgs Factory to Multi-TeV 3791
 
  • J.-P. Delahaye, E. Adli, S.J. Gessner, M.J. Hogan, T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
  • W. An, C. Joshi, W.B. Mori
    UCLA, Los Angeles, California, USA
 
  An updated design of a beam-driven Plasma Wake-Field Acceleration Linear Collider (PWFA-LC) covering a wide range of beam collision energy from Higgs factory to multi-TeV is presented. The large effective accelerating field on the order of 1 GV/m and high wall-plug to beam power transfer efficiency of the beam driven plasma technology in a continuous operation mode allows to extend linear colliders to unprecedented beam collision energies up to 10 TeV with reasonable facility extension and power consumption. An attractive scheme of an ILC energy upgrade using the PWFA technology in a pulsed mode is discussed. The major critical issues and the R&D to address their feasibility in dedicated test facilities like FACET and FACET2 are outlined, especially the beam quality preservation during acceleration and the positron acceleration. Finally, a tentative scenario of a series of staged facilities with increasing complexity starting with short term application at low energy is developed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI013  
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THPRI030 Progress Towards Completion of the MICE Demonstration of Muon Ionization Cooling 3831
 
  • D.M. Kaplan, P. Snopok
    Illinois Institute of Technology, Chicago, Illinois, USA
  • A.J. Dobbs
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • P. Snopok
    Fermilab, Batavia, Illinois, USA
 
  Funding: DOE, NSF, STFC, INFN, CHIPP and several others
The Muon Ionization Cooling Experiment (MICE) at the Rutherford Appleton Laboratory aims to demonstrate ~10% ionization cooling of a muon beam, by its interaction with low-Z absorber materials followed by restoration of longitudinal momentum in RF linacs. MICE Step V will provide the flexibility for a thorough exploration and characterization of the performance of ionization cooling. Step V will include four RF cavities to provide 8 MV/m gradient in a strong magnetic field. This entails an RF drive system to deliver 2 MW, 1 ms pulses of 201 MHz frequency at 1 Hz repetition rate, the distribution network to deliver 1 MW to each cavity with correct RF phasing, diagnostics to determine the gradient and the muon transit phase, and development of the large diameter magnets required in order to keep the muons focused through the linacs. Progress towards the completion of Step V is described.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI030  
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