R. Ostojic

Bio: R. Ostojic is an academic researcher from CERN. The author has contributed to research in topics: Superconducting magnet & Large Hadron Collider. The author has an hindex of 10, co-authored 40 publications receiving 567 citations.

LHC Design Report Vol.1: The LHC Main Ring

Abstract: The LHC Design Report is presented in three volumes: the first concerns the main ring, the second the infrastructure and general services and the third, the injector chain. The conceptual design was published in 1995 and this report provides a snapshot of the detailed design as it stands at the time of writing - early 2004

Mu2e Conceptual Design Report

Abstract: Author(s): Project, The Mu2e; Collaboration; Abrams, RJ; Alezander, D; Ambrosio, G; Andreev, N; Ankenbrandt, CM; Asner, DM; Arnold, D; Artikov, A; Barnes, E; Bartoszek, L; Bernstein, RH; Biery, K; Biliyar, V; Bonicalzi, R; Bossert, R; Bowden, M; Brandt, J; Brown, DN; Budagov, J; Buehler, M; Burov, A; Carcagno, R; Carey, RM; Carosi, R; Cascella, M; Cauz, D; Cervelli, F; Chandra, A; Chang, JK; Cheng, C; Ciambrone, P; Coleman, RN; Cooper, M; Corcoran, MC; Cordelli, M; Davydov, Y; Gouvea, AL de; Lorenzis, L De; Debevec, PT; DeJongh, F; Densham, C; Deuerling, G; Dey, J; Falco, S Di; Dixon, S; Djilkibaev, R; Drendel, B; Dukes, EC; Dychkant, A; Echenard, B; Ehrlich, R; Evans, N; Evbota, D; Fang, I; Fast, JE; Feher, S; Fischler, M; Frank, M; Frlez, E; Fung, SS; Gallo, G; Galucci, G; Gaponenko, A; Genser, K; Giovannella, S; Glagolev, V; Glenzinski, D; Gnani, D; Goadhouse, S; Gollin, GD; Grace, C; Grancagnolo, F; Group, C; Hanson, J; Hanson, S; Happacher, F; Heckmaier, E; Hedin, D; Hertzog, DW; Hirosky, R; Hitlin, DG; Ho, E; Huang, X | Abstract: Mu2e at Fermilab will search for charged lepton flavor violation via the coherent conversion process mu- N --g e- N with a sensitivity approximately four orders of magnitude better than the current world's best limits for this process. The experiment's sensitivity offers discovery potential over a wide array of new physics models and probes mass scales well beyond the reach of the LHC. We describe herein the conceptual design of the proposed Mu2e experiment. This document was created in partial fulfillment of the requirements necessary to obtain DOE CD-1 approval, which was granted July 11, 2012.

Towards a new LHC interaction region design for a luminosity upgrade

Abstract: After the LHC operates for several years at nominal parameters, it will be necessary to upgrade it for higher luminosity. Replacing the low-/spl beta/ insertions with a higher performance design based on advanced superconducting magnets is one of the most straightforward steps in this direction. Preliminary studies show that, with magnet technology that is expected to be developed by early in the next decade, a factor of 2 to 5 reduction in /spl beta/* could be achieved with new insertions, as part of an upgrade aimed at a factor of 10 luminosity increase. In this paper we survey several possible second generation LHC interaction regions designs, which address the expected limitations on LHC performance imposed by the baseline insertions.

Design study of a superconducting insertion quadrupole magnet for the Large Hadron Collider

Abstract: The conceptual design study of a high gradient superconducting insertion quadrupole magnet has been carried out in collaboration between KEK and CERN for the Large Hadron Collider (LHC) to be built at CERN. A model magnet design has been optimized to provide a nominal design field gradient of 240 T/m with a bore aperture of 70 mm and an operational field gradient of 225 T/m at 1.9 K under radiation environment with a deposition of several watts per meter in the superconducting coils. The design and its process are discussed.

Design and construction of a one-metre model of the 70 mm aperture quadrupole for the LHC low-/spl beta/ insertions

Abstract: In order to achieve high field quality and low current rating of the 250 T/m quadrupoles for the LHC low-/spl beta/ insertions, a design based on a graded four-layer coil with an aperture of 70 mm, wound from NbTi conductor cooled at 1.8 K, has been proposed. Its mechanical structure is based on the collar-spacer concept, where a thin collar serves for coil assembly only. The iron yoke has both important magnetic and structural functions, since the magnetic forces are taken by the rigidity of the iron lamination pack. The coil and cable parameters are derived for this particular structure, and the results of the structural analysis of the magnet are presented. A one-metre model of the quadrupole is presently under construction; its features are described and some initial cable tests reported. >

A Large Hadron Electron Collider at CERN

Abstract: This document provides a brief overview of the recently published report on the design of the Large Hadron Electron Collider (LHeC), which comprises its physics programme, accelerator physics, technology and main detector concepts. The LHeC exploits and develops challenging, though principally existing, accelerator and detector technologies. This summary is complemented by brief illustrations of some of the highlights of the physics programme, which relies on a vastly extended kinematic range, luminosity and unprecedented precision in deep inelastic scattering. Illustrations are provided regarding high precision QCD, new physics (Higgs, SUSY) and electron-ion physics. The LHeC is designed to run synchronously with the LHC in the twenties and to achieve an integrated luminosity of O(100)\,fb$^{-1}$. It will become the cleanest high resolution microscope of mankind and will substantially extend as well as complement the investigation of the physics of the TeV energy scale, which has been enabled by the LHC.

The Phenomenology of Right Handed Neutrinos

Abstract: Neutrinos are the only particles in the Standard Model (SM) of particle physics that have only been observed with left handed chirality to date. If right handed (RH) neutrinos exist, they could be responsible for several phenomena that have no explanation within the SM, including neutrino oscillations, the baryon asymmetry of the universe, dark matter (DM) and dark radiation (DR). After a pedagogical introduction, we review recent progress in the phenomenology of RH neutrinos. We in particular discuss the mass ranges suggested by hints for neutrino oscillation anomalies and DR (eV), sterile neutrino DM scenarios (keV) and experimentally testable theories of baryogenesis (GeV to TeV). We summarize constraints from theoretical considerations, laboratory experiments, astrophysics and cosmology for each of these.

Non-unitarity of the leptonic mixing matrix: present bounds and future sensitivities

Abstract: The non-unitarity of the effective leptonic mixing matrix at low energies is a generic signal of extensions of the Standard Model (SM) with extra fermionic singlet particles, i.e. “sterile” or “right-handed” neutrinos, to account for the observed neutrino masses. The low energy effects of such extensions can be described in a model-independent way by the Minimal Unitarity Violation (MUV) scheme, an effective field theory extension of the SM. We perform a global fit of the MUV scheme parameters to the present experimental data, which yields the up-to-date constraints on leptonic non-unitarity. Furthermore, we investigate the sensitivities and discovery prospects of future experiments. In particular, FCC-ee/TLEP would be a powerful probe of flavour-conserving non-unitarity for singlet masses up to ∼60 TeV. Regarding flavour-violating non-unitarity, future experiments on muon-to-electron conversion in nuclei could even probe extensions with singlet masses up to ∼0.3 PeV.

NA61/SHINE facility at the CERN SPS: beams and detector system

Abstract: NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose experimental facility to study hadron production in hadron-proton, hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton Synchrotron. It recorded the first physics data with hadron beams in 2009 and with ion beams (secondary 7Be beams) in 2011. NA61/SHINE has greatly profited from the long development of the CERN proton and ion sources and the accelerator chain as well as the H2 beamline of the CERN North Area. The latter has recently been modified to also serve as a fragment separator as needed to produce the Be beams for NA61/SHINE. Numerous components of the NA61/SHINE set-up were inherited from its predecessors, in particular, the last one, the NA49 experiment. Important new detectors and upgrades of the legacy equipment were introduced by the NA61/SHINE Collaboration. This paper describes the state of the NA61/SHINE facility — the beams and the detector system — before the CERN Long Shutdown I, which started in March 2013.