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"Jowett, John"
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Prospects for future asymmetric collisions in the LHC
The proton-lead runs of the LHC in 2012, 2013 and 2016 provided luminosity far beyond expectations in a diversity of operating conditions and led to important new results in high-density QCD. This has permitted the scope of the future physics programme to be expanded in a recent review. Besides further high-luminosity proton-lead (p-Pb) collisions, lighter nuclei are also under consideration. A short proton-oxygen run, on the model of the 2012 p-Pb run, would be of interest for cosmic-ray physics. Collisions of protons with argon, other noble gases and nuclei of lighter metals are also discussed. We provide an overview of the operational strategies and potential performance of various options. Potential performance limits from moving beam-beam encounters at injection and various beam-loss mechanisms are evaluated in the light of our understanding of the LHC to date.
Journal Article
Whose Hamlet Mocks the Warm Clown?
On Jul 26, 1602 the stationer James Roberts entered in the Stationers' Register his title to publish Hamlet. In order to do so, he must have possessed a manuscript of the play by this date. The short First Quatro (Q1) appeared the following year, having been printed by Valentine Simmes for Nicholas Ling and John Trundle. The Second Quarto of 1604-5 (Q2), a much longer text, was printed by Roberts himself for Ling. There is no record of a transfer from Roberts to Ling, though an informal transfer would not have been an irregularity. For Shakespeare scholars, these are familiar and secure facts, islands of certainty amidst areas of textual criticism and book history given over to uncertainty and dispute. For many critics, Q1 is a debased text that has gone through some form of disruptive transmission such as memorial reconstruction by actors.
Journal Article
Facilities for the Energy Frontier of Nuclear Physics
The Relativistic Heavy Ion Collider at BNL has been exploring the energy frontier of nuclear physics since 2001. Its performance, flexibility and continued innovative upgrading can sustain its physics output for years to come. Now, the Large Hadron Collider at CERN is about to extend the frontier energy of laboratory nuclear collisions by more than an order of magnitude. In the coming years, its physics reach will evolve towards still higher energy, luminosity and varying collision species, within performance bounds set by accelerator technology and by nuclear physics itself. Complementary high-energy facilities will include fixed-target collisions at the CERN SPS, the FAIR complex at GSI and possible electron-ion colliders based on CEBAF at JLAB, RHIC at BNL or the LHC at CERN.
Journal Article
Shakespeare and text
OXFORD SHAKESPEARE TOPICS General Editors: Peter Holland and Stanley Wells Oxford Shakespeare Topics provide students and teachers with short books on important aspects of Shakespeare criticism and scholarship. Each book is written by an authority in its field, and combines accessible style with original discussion of its subject. Shakespeare and Text is an indispensable and unique guide to its topic. It takes Shakespeare readers to the very foundation of his work, explaining how his plays first took shape in the theatre where writing was part of a larger collective enterprise. As the resulting manuscripts are virtually all lost, the account then turns to the early modern printing industry that produced the earliest surviving texts of Shakespeare's plays. It describes the roles of publisher and printer, the controls exerted through the Stationers' Company, and the technology of printing. A chapter is devoted to the book that gathered Shakespeare's plays together for the first time, the First Folio of 1623. Shakespeare and Text goes on to survey the major developments in textual studies over the past century. It builds on the recent upsurge of interest in textual theory, and deals with issues such as collaboration, the instability of the text, the relationship between theatre culture and print culture, and the book as a material object. Later chapters examine the current critical edition, explaining the procedures that transform early texts in to a very different cultural artefact, the edition in which we regularly encounter Shakespeare.
eBook
Bound-free pair production from nuclear collisions and the steady-state quench limit of the main dipole magnets of the CERN Large Hadron Collider
During its Run 2 (2015–2018), the Large Hadron Collider (LHC) operated at almost twice higher energy, and provided Pb-Pb collisions with an order of magnitude higher luminosity, than in the previous Run 1. In consequence, the power of the secondary beams emitted from the interaction points by the bound-free pair production (BFPP) process increased by a factor∼20, while the propensity of the bending magnets to quench increased with the higher magnetic field. This beam power is about 35 times greater than that contained in the luminosity debris from hadronic interactions and is focused on specific locations that fall naturally inside superconducting magnets. The risk of quenching these magnets has long been recognized as severe and there are operational limitations due to the dynamic heat load that must be evacuated by the cryogenic system. High-luminosity operation was nevertheless possible thanks to orbit bumps that were introduced in the dispersion suppressors around the ATLAS and CMS experiments to prevent quenches by displacing and spreading out these beam losses. Further, in 2015, the BFPP beams were manipulated to induce a controlled quench, thus providing the first direct measurement of the steady-state quench level of an LHC dipole magnet. The same experiment demonstrated the need for new collimators that are being installed around the ALICE experiment to intercept the secondary beams in the future. This paper discusses the experience with BFPP at luminosities very close to the future High Luminosity LHC (HL-LHC) target, gives results on the risk reduction by orbit bumps and presents a detailed analysis of the controlled quench experiment.
Journal Article
