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Proton Driven Plasma Wakefield Acceleration in AWAKE
Proton Driven Plasma Article submitted to journal Wakefield Acceleration in Subject Areas: AWAKE Plasma Wakefield Acceleration, 1 1 Proton Driven, Electron Acceleration E. Gschwendtner , M. Turner , **Author List Continues Next Page** Keywords: AWAKE, Plasma Wakefield Acceleration, Seeded Self Modulation In this article, we briefly summarize the experiments Author for correspondence: performed during the first Run of the Advanced Insert corresponding author name Wakefield Experiment, AWAKE, at CERN (European e-mail: [email protected] Organization for Nuclear Research). The final goal of AWAKE Run 1 (2013 - 2018) was to demonstrate that 10-20 MeV electrons can be accelerated to GeV- energies in a plasma wakefield driven by a highly- relativistic self-modulated proton bunch. We describe the experiment, outline the measurement concept and present first results. Last, we outline our plans for the future. 1 Continued Author List 2 E. Adli2,A. Ahuja1,O. Apsimon3;4,R. Apsimon3;4, A.-M. Bachmann1;5;6,F. Batsch1;5;6 C. Bracco1,F. Braunmüller5,S. Burger1,G. Burt7;4, B. Buttenschön8,A. Caldwell5,J. Chappell9, E. Chevallay1,M. Chung10,D. Cooke9,H. Damerau1, L.H. Deubner11,A. Dexter7;4,S. Doebert1, J. Farmer12, V.N. Fedosseev1,R. Fiorito13;4,R.A. Fonseca14,L. Garolfi1,S. Gessner1, B. Goddard1, I. Gorgisyan1,A.A. Gorn15;16,E. Granados1,O. Grulke8;17, A. Hartin9,A. Helm18, J.R. Henderson7;4,M. Hüther5, M. Ibison13;4,S. Jolly9,F. Keeble9,M.D. Kelisani1, S.-Y. Kim10, F. Kraus11,M. Krupa1, T. Lefevre1,Y. Li3;4,S. Liu19,N. Lopes18,K.V. Lotov15;16, M. Martyanov5, S. -
The Large Hadron Collider Lyndon Evans CERN – European Organization for Nuclear Research, Geneva, Switzerland
34th SLAC Summer Institute On Particle Physics (SSI 2006), July 17-28, 2006 The Large Hadron Collider Lyndon Evans CERN – European Organization for Nuclear Research, Geneva, Switzerland 1. INTRODUCTION The Large Hadron Collider (LHC) at CERN is now in its final installation and commissioning phase. It is a two-ring superconducting proton-proton collider housed in the 27 km tunnel previously constructed for the Large Electron Positron collider (LEP). It is designed to provide proton-proton collisions with unprecedented luminosity (1034cm-2.s-1) and a centre-of-mass energy of 14 TeV for the study of rare events such as the production of the Higgs particle if it exists. In order to reach the required energy in the existing tunnel, the dipoles must operate at 1.9 K in superfluid helium. In addition to p-p operation, the LHC will be able to collide heavy nuclei (Pb-Pb) with a centre-of-mass energy of 1150 TeV (2.76 TeV/u and 7 TeV per charge). By modifying the existing obsolete antiproton ring (LEAR) into an ion accumulator (LEIR) in which electron cooling is applied, the luminosity can reach 1027cm-2.s-1. The LHC presents many innovative features and a number of challenges which push the art of safely manipulating intense proton beams to extreme limits. The beams are injected into the LHC from the existing Super Proton Synchrotron (SPS) at an energy of 450 GeV. After the two rings are filled, the machine is ramped to its nominal energy of 7 TeV over about 28 minutes. In order to reach this energy, the dipole field must reach the unprecedented level for accelerator magnets of 8.3 T. -
Lesson 46: Cloud & Bubble Chambers
Lesson 46: Cloud & Bubble Chambers Imagine you're on a really stupid game show where they put a whole bunch of ping pong balls on the floor, turn off the lights, and then send you in to count them. How would you do it? • I'm thinking that your only chance is to get down on your hands and knees and try to touch them around you. • One of the problems is that in the very act of counting them (by reaching out), you change them by pushing them around, maybe even missing some of them. This is kind of the same problem that subatomic physicists have. They have to reach around “in the dark” to measure something that they can't see. • The amazing part is that methods have been developed to do this, and actually do it accurately. • This is the beginning of our journey into the modern subatomic realm of physics. Cloud Chambers In 1894 the Scottish physicist Charles Wilson was interested in the odd shadows that can sometimes be formed on cloud tops by mountain climbers (called Brocken Spectre). • To be able to study this further, he came up with a way water to build a device called a cloud chamber that would droplets allow him to make his own mini-clouds inside a glass chamber. ◦ To be able to do this he made his device so that he could keep the air inside supersaturated with water. ▪ Air can usually only hold a certain amount of path of vapour. Supersaturated means the air was charged particle holding more vapour than it would normally be Illustration 1: Water droplets condense able to at that pressure and temperature. -
CERN Intersecting Storage Rings (ISR)
Proc. Nat. Acad. Sci. USA Vol. 70, No. 2, pp. 619-626, February 1973 CERN Intersecting Storage Rings (ISR) K. JOHNSEN CERN It has been realized for many years that it would be possible to beams of protons collide with sufficiently high interaction obtain a glimpse into a much higher energy region for ele- rates for feasible experimentation in an energy range otherwise mentary-particle research if particle beams could be persuaded unattainable by known techniques except at enormous cost. to collide head-on. A group at CERN started investigating this possibility in To explain why this is so, let us consider what happens in a 1957, first studying a special two-way fixed-field alternating conventional accelerator experiment. When accelerated gradient (FFAG) accelerator and then, in 1960, turning to the particles have reached the required energy they are directed idea of two intersecting storage rings that could be fed by the onto a target and collide with the stationary particles of the CERN 28 GeV proton synchrotron (CERN-PS). This change target. Most of the energy given to the accelerated particles in concept for these initial studies was stimulated by the then goes into keeping the particles that result from the promising performance of the CERN-PS from the very start collision moving in the direction of the incident particles (to of its operation in 1959. conserve momentum). Only a quite modest fraction is "useful After an extensive study that included building an electron energy" for the real purpose of the experiment-the trans- storage ring (CESAR) to investigate many of the associated formation of particles, the creation of new particles. -
Femtoscopy of Proton-Proton Collisions in the ALICE Experiment
Femtoscopy of proton-proton collisions in the ALICE experiment DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By Nicolas Bock, B.Sc. B.Eng., M.Sc. Graduate Program in Physics The Ohio State University 2011 Dissertation Committee: Professor Thomas J. Humanic, Advisor Professor Michael Lisa #1 Professor Klaus Honscheid #2 Professor Richard Furnstahl #3 c Copyright by Nicolas Bock 2011 Abstract The Large Ion Collider Experiment (ALICE) at CERN has been designed to study matter at extreme conditions of temperature and pressure, with the long term goal of observing deconfined matter (free quarks and gluons), study its properties and learn more details about the phase diagram of nuclear matter. The ALICE experiment provides excellent particle tracking capabilities in high multiplicity proton-proton and heavy ion collisions, allowing to carry out detailed research of nuclear matter. This dissertation presents the study of the space time structure of the particle emission region, also known as femtoscopy, in proton- proton collisions at 0.9, 2.76 and 7.0 TeV. The emission region can be characterized by taking advantage of the Bose-Einstein effect for identical particles, which causes an enhancement of produced identical pairs at low relative momentum. The geometry of the emission region is related to the relative momentum distribution of all pairs by the Fourier transform of the source function, therefore the measurement of the final relative momentum distribution allows to extract the initial space-time characteristics. Results show that there is a clear dependence of the femtoscopic radii on event multiplicity as well as transverse momentum, a signature of the transition of nuclear matter into its fundamental components and also of strong interaction among these. -
Very Elementary Particle Physics
17 Very Elementary Particle Physics Martinus J.G. Veltman Abstract This address was presented by Martinus J.G. Veltman as the Nishina Memorial Lecture at the High Energy Accelerator Research Organization on April 4, 2003, and at the University of Tokyo on April 11, 2003 Introduction Today we believe that everything, matter, radiation, gravita- tional fields, is made up from elementary particles. The ob- ject of particle physics is to study the properties of these el- ementary particles. Knowing all about them in principle im- plies knowing all about everything. That is a long way off, we do not know if our knowledge is complete, and also the way from elementary particles to the very complicated Uni- verse around us is very very difficult. Yet one might think that at least everything can be explained once we know all about the elementary particles. Of course, when we look to Martinus J.G. Veltman such complicated things as living matter, an animal or a hu- c NMF man being, it is really hard to see how one could understand all that. And of course, there may be specific properties of particles that elude the finest detection instruments and are yet crucial to complex systems such as a human being. In the second half of the twentieth century the field of elementary particle physics came into existence and much progress has been made. Since 1948 about 25 Nobel prizes have been given to some 42 physicists working in this field, and this can be seen as a measure of the amount of ingenuity involved and the results achieved. -
The Birth and Development of the First Hadron Collider the Cern Intersecting Storage Rings (Isr)
Subnuclear Physics: Past, Present and Future Pontifical Academy of Sciences, Scripta Varia 119, Vatican City 2014 www.pas.va/content/dam/accademia/pdf/sv119/sv119-hubner.pdf The BirtTh a nd D eve lopment o f the Fir st Had ron C ollider The CERN Intersecting Storage Rings (ISR) K. H ÜBNER , T.M. T AYLOR CERN, 1211 Geneva 23, Switzerland Abstract The CERN Intersecting Storage Rings (ISR) was the first facility providing colliding hadron beams. It operated mainly with protons with a beam energy of 15 to 31 GeV. The ISR were approved in 1965 and were commissioned in 1971. This paper summarizes the context in which the ISR emerged, the design and approval phase, the construction and the commissioning. Key parameters of its performance and examples of how the ISR advanced accelerator technology and physics are given. 1. Design and approval The concept of colliding beams was first published in a German patent by Rolf Widerøe in 1952, but had already been registered in 1943 (Widerøe, 1943). Since beam accumulation had not yet been invented, the collision rate was too low to be useful. This changed only in 1956 when radio-frequency (rf) stacking was proposed (Symon and Sessler, 1956) which allowed accumulation of high-intensity beams. Concurrently, two realistic designs were suggested, one based on two 10 GeV Fixed-Field Alternating Gradient Accelerators (FFAG) (Kerst, 1956) and one suggesting two 3 GeV storage rings with synchrotron type magnet structure (O’Neill, 1956); in both cases the beams collided in one common straight section. The idea of intersecting storage rings to increase the number of interaction points appeared later (O’Neill, 1959). -
Mmw11111m1111111111m11111~11~M1111wh CM-P00043015
CHS-26 '-0 November 1988 N I -VJ CERN LIBRARIES, GENEYA mmw11111m1111111111m11111~11~m1111wH CM-P00043015 STUDIES IN CERN HISTORY The Construction of CERN's First Hydrogen Bubble Chambers Laura Weiss GENEVA 1988 The Study of CERN History is a project financed by Institutions in several CERN Member Countries. This report presents preliminary findings, and is intended for incorporation into a more comprehensive study of CERN's history. It is distributed primarily to historians and scientists to provoke discussion, and no part of ii should be ci1ed or reproduced wi1hout written permission from the author. Comments are welcome and should be sent to: Study Team for CERN History c!o CERN CH-1211 GENEVE 23 Switzerland Copyright Study Team for CERN History, Geneva 1988 CHS-26 November 1988 STUDIES IN CERN HISTORY The Construction of CERN's First Hydrogen Bubble Chambers Laura Weiss GENEVA 1988 The Study of CERN History is a project financed by Institutions in several CERN Member Countries. This report presents preliminary findings, and is intended for incorporation into a more comprehensive study of CERN's history. It is distributed primarily to historians and scientists to provoke discussion, and no part of it should be cited or reproduced without written permission from the author. Comments are welcome and should be sent to: Study Team for CERN History c/oCERN CH-1211GENEVE23 Switzerland " Copyright Study Team for CERN History, Geneva 1988 CERN~ Service d'information scicntifique - 400 - novembre 1988 TABLE OF CONTENTS 8.1 Historical overview -
Bubble Chamber
1: Bubble Chamber Purpose The purpose of this experiment is to determine the rest mass of the pion (mπ) and the rest mass of the muon (mµ). Introduction Particle physics (a.k.a. high energy physics) is the division of physics which investigates the behavior of particles involved in \high" energy collisions. (\High" here means energies greater than those found in nuclear reactions, i.e., more than 100 MeV=0.1 GeV. The highest energy particle accelerators available today produce collisions with energies of a few million MeV = TeV.) The first \new" particles discovered (circa 1940) by particle physicists were the pion (π) and the muon (µ). In spite of roughly similar masses (near 100 MeV, compare: electron mass = .511 MeV and proton mass = 938 MeV), these two particles have quite different properties. The muon is a relative of the electron (and hence is called a lepton). It comes in particle − + 1 (µ ) and anti-particle (µ ) versions and has spin 2 . Unlike the electron, the muon is unstable. It decays into two neutrinos (ν) and an electron (or positron) after a mean life of 2 10−6 s: × µ+ ν¯ + ν + e+ (1.1) −! µ− ν + ν¯ + e− (1.2) −! The pion belongs to the class of particles called mesons. Unlike leptons, mesons interact with protons and neutrons through an additional force called the strong nuclear force (a.k.a., color force). (Particles that can feel this force are called hadrons.) Unlike leptons, mesons are known to be composite particles: each is made of a quark and an antiquark. -
Improving the Slow Extraction Efficiency of the CERN Super
Improving the slow extraction efficiency of the CERN Super Proton Synchrotron Brunner Kristóf Faculty of Science Eötvös Loránd University Supervisors: Barna Dániel, Wigner RCP Christoph Wiesner, CERN May 2018 Contents 1 Introduction4 2 CERN accelerator complex5 2.1 Accelerators..................................... 5 2.2 Experiments..................................... 6 2.2.1 Colliders .................................. 7 2.2.2 Fixed target experiments.......................... 7 2.3 Current and future demands of fixed target experiments.............. 7 3 Introduction to accelerator physics9 3.1 History of linear and circular accelerators ..................... 9 3.2 Design orbit, focusing................................. 11 3.3 Betatron oscillation, the behaviour of single particles ................ 11 3.4 The Twiss-ellipse, the behaviour of the beam ................... 13 3.5 Normalised phase space............................... 15 3.6 Tune and resonances ................................ 16 4 Extraction from a synchrotron 19 4.1 Fast extraction.................................... 19 4.2 Multi-turn extraction ................................ 20 4.3 Sextupole driven slow extraction........................... 21 4.4 Possible enhancements............................... 24 4.4.1 Diffuser................................... 24 4.4.2 Dynamic bump............................... 26 4.4.3 Phase space folding............................. 26 5 Massless septum 28 5.1 Method of phase space folding using a massless septum.............. 29 6 Simulation -
Beam Monitoring System for the ATLAS Experiment at CERN
Department of Physics, Chemistry and Biology Master’s Thesis Phase and Intensity Monitoring of the Particle Beams at the ATLAS Experiment Christian Ohm LITH-IFM-EX--07/1808--SE CERN-THESIS-2007-055 24/05/2007 Department of Physics, Chemistry and Biology Linköpings universitet SE-581 83 Linköping, Sweden Master’s Thesis LITH-IFM-EX--07/1808--SE Phase and Intensity Monitoring of the Particle Beams at the ATLAS Experiment Christian Ohm Supervisor: Thilo Pauly CERN Examiner: Patrick Norman ifm, Linköpings universitet Linköping, 24 May, 2007 Avdelning, Institution Datum Division, Department Date Division of Computational Physics Department of Physics, Chemistry and Biology 2007-05-24 Linköpings universitet SE-581 83 Linköping, Sweden Språk Rapporttyp ISBN Language Report category — Svenska/Swedish Licentiatavhandling ISRN Engelska/English Examensarbete LITH-IFM-EX--07/1808--SE C-uppsats Serietitel och serienummer ISSN D-uppsats Title of series, numbering — Övrig rapport URL för elektronisk version http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-9614 Titel Intensitets- och fasövervakningssystem för partikelstrålarna vid ATLAS- Title experimentet Phase and Intensity Monitoring of the Particle Beams at the ATLAS Experiment Författare Christian Ohm Author Sammanfattning Abstract At the ATLAS experiment at CERN’s Large Hadron Collider, bunches of protons will cross paths at a rate of 40 MHz, resulting in 14 TeV head-on collisions. During these interactions, calorimeters, spectrometers and tracking detectors will look for evidence that can confirm or disprove theories about the smallest constituents of matter and the forces that hold them together. In order for these sub-detectors to sample the signals from exotic particles correctly, they rely on a constant phase between a clock signal and the bunch crossings in the experiment. -
II~ O Llbd 0026270 3 the Yeiu' 1993 Il A
1111111~/11'~I~~l~i~l~~ij~I'1~~~II~ o llbD 0026270 3 The yeiU' 1993 il a. b&nner anniveuary ior our understanding of nature: it marks the 10th anniversary of the di.covery of the ca.rriera of the Weak force: the Wand Z particles at CERN, the laboratory near Geneva, Switzerland; the 20th anniversary of the discovery of Weak Neutral Currents in Nature: a Thirty Year the Weak Neutral Currents, and the 30th anniversary of the first revealing but null searches Retrospective· for Weak Neutral Currentl that change the Quark Family! All of these developments have left a profound mark on our study of the most fundamental aspects of nature: "the Elementary Particles and their Forces". These observations helped develop the foundation David B. Cline of the Standard Model of Elementary Particles. This article is a partial cele~ration of this Center for Advanced Accelerator anniversary and an attempt to peer into the future implications and gain a 'perspective 011 Department.! of Phllsia & Astronomy these accomplishment.. A. in the telling of the history of any human accomplishments. University of California Los Angdes it will appear more logical than when it actually occurred. We wiU also describe how .. OS Hilgard Avenue, Los Angeiu, CA 900f"-15"7, USA the intervening yean have taught UI the way in which Neutral Currents contribute to A.trophysic. and the ExplOlion o( Supernova, wiU help in future possible break.throu!1;hs UCLA-PPH0052-8/93 2 -0 in the study of Elementary Particles and possibly even the very nature of life on Earth: the double helix structure of DNA, present in all life forms! It can now be said the there have been three major advances in Physics during the Ab,tract past 100 or so yean.