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Now showing items 1 - 13 of 13

  • The influence of Ceres on the dynamical evolution of the Zdenekhorsky/Nemesis asteroid family

    Carruba, V.   Barletta, W.  

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  • Remembrances of John Madey and Rodolfo Bonifacio

    Barletta, W.   Parmigiani, F.  

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  • Editorial

    Barletta, W.   Karlsson, E.   Klanner, R.   Knoll, G.F.  

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  • Collisions

    Barletta, W.   Johnson, M.   Ludlam, T.   Slaughter, A. J.   Taft, H. D.  

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  • [AIP The sixth advanced accelerator concepts workshop - Fontana, Wisconsin (USA) (12?18 Jun 1994)] AIP Conference Proceedings - Plasma lens experiments at the final focus test beam

    Barletta, W.   Chattopadhyay, S.   Chen, P.   Cline, D.   Craddock, W.   Gabella, W.   Hsu, I.   Iverson, R.   Katsouleas, T.   Kwok, P.   Lai, P.   Leemans, W.   Liou, R.   Meyerhofer, D. D.   Nakajima, K.   Nakanishi, H.   Ng, C. K.   Nishida, Y.   Norem, J.   Ogata, A.   Rajagopalan, S.   Shintake, T.   Rosenzweig, J.   Ross, M.   Sessler, A.   Spencer, J.   Su, J. J.   Walker, N.   Westenskow, G.   Whittum, D.   Williams, R.   Wurtele, J.  

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  • [IEEE International Conference on Particle Accelerators - Washington, DC, USA (17-20 May 1993)] Proceedings of International Conference on Particle Accelerators - PEP-II design update and R&D results

    Barletta, W.   Zisman, M.S.   Bell, R.A.   Dorfan, J.M.  

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  • The UCLA IR-FEL

    Aghamir, F.   Barletta, W.   Cline, D.   Dodd, J.   Hartmann, S.   Joshi, C.   Kolonko, J.   Luhmann, N.   McDermott, D.   Pellegrini, C.   Terrien, C.  

    Summary form only given. A high-brightness RF gun operating at 2.856 GHz is being used as the injector for an IR-FEL (free-electron laser) experiment. The RF gun consists of a disk loaded; 1.5 cell cavity and a photocathode in the end wall of the cavity. A strong electric field within the half cell near the photocathode quickly accelerates the electrons; thus preventing emittance blow-up. The photocathode is to be driven by a Nd:YAG laser system producing a 10-ps pulse. The power for the RF gun will be supplied by a 25-MW klystron. The RF power is coupled to the cavity via an S-band waveguide attached to the sidewall of the gun. The TE/sub 10/ mode excited in the waveguide strongly couples to the pi -mode with the RF gun while the zero mode is suppressed.
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  • Engineering Study of the Sector Magnet for the Dae delta alus Experiment

    Radovinsky, A.   Smith, B.   Miller, C. E.   Minervini, J. V.   Cheadle, M.   Calabretta, L.   Alonso, J.   Conrad, J.   Calanna, A.   Barletta, W.  

    The Dae delta alus experiment seeks to evaluate neutrino scattering effects that go beyond the standard model. Modular accelerators are employed to produce 800 MeV proton beams at the megawatt power level directed toward a target, producing neutrinos. The Superconducting Ring Cyclotron consists of identical sectors (currently 6) of superconducting dipole magnets with iron return frames. The Dae delta alus Collaboration has produced a conceptual design for the magnet, which, after several iterations, is the current hest design that achieves the physics requirements of the experiment. The main purpose of the analytical effort, results of which are presented here, is to develop a viable engineering design satisfying requirements to the superconductor, as well as structural and cryogenic requirements. The work includes proposed conceptual approaches, solid modeling and analyses for the conductor and winding pack design, high-temperature superconductor and copper current leads for the magnet, structural design of the magnet cold mass, cryostat and warm-to-cold supports, cryogenic design of the magnet cooling system, and magnet power supply sizing A description of the winding pack design, structural analysis, and cryogenic system is reported.
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  • The population of rotational fission clusters inside asteroid collisional families

    Carruba, V.   Spoto, F.   Barletta, W.   Aljbaae, S.   Fazenda, Á. L.   Martins, B.  

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  • Critical issues in low energy muon colliders-a summary

    Chattopadhyay, S.   Barletta, W.   Maury, S.   Neuffer, D.   Ruggiero, A.   Sessler, A.  

    We present a brief summary of the current state of conception and understanding of the accelerator physics issues for low energy muon colliders envisioned as Higgs factories, associated technological challenges and future research directions on this topic
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  • Educating and Training Accelerator Scientists and Technologists for Tomorrow

    Barletta, W.   Chattopadhyay, S.   Seryi, A.  

    Accelerator science and technology is inherently an integrative discipline that combines aspects of physics, computational science, electrical and mechanical engineering. As few universities offer full academic programs, the education of accelerator physicists and engineers for the future has primarily relied on a combination of on-the-job training supplemented with intensive courses at regional accelerator schools. This article describes the approaches being used to satisfy the educational curiosity of a growing number of interested physicists and engineers.
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  • Beam dynamics simulation for the high intensity DAE delta ALUS cyclotrons

    Yang, J. J.   Adelmann, A.   Barletta, W.   Calabretta, L.   Calanna, A.   Campo, D.   Conrad, J. M.  

    In the DAE delta ALUS (Decay-At-rest Experiment for delta(CP) studies At the Laboratory for Underground Science) project, high power H-2(+) cyclotron chains are proposed to efficiently provide proton beams with a kinetic energy of 800 MeV and an average power in the MW range. Space charge plays a pivotal role in both the injector and the ring cyclotrons. Large-scale particle simulations show that the injector cyclotron is a space charge dominated cyclotron and that a 5 mA beam current can be extracted with tolerable beam losses on the septum. In contrast, in the ring cyclotron, no space charge induced beam loss is observed during acceleration and extraction. (C) 2012 Elsevier B.V. All rights reserved.
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  • PEP-II design update and R&D results

    Barletta, W.   Zisman, M.S.   Bell, R.A.   Dorfan, J.M.  

    We describe the present status of the PEP-II asymmetric B factory design undertaken by SLAC, LBL, and LLNL. Design optimization and changes from the original CDR are described. R&D activities have focused primarily on the key technology areas of vacuum, RF, and feedback system design. Recent progress in these areas is described. The R&D results have verified our design assumptions and provide further confidence in the design of PEP-II.
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