Case Studies at CERN
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
CERN Courier–Digital Edition
CERNMarch/April 2021 cerncourier.com COURIERReporting on international high-energy physics WELCOME CERN Courier – digital edition Welcome to the digital edition of the March/April 2021 issue of CERN Courier. Hadron colliders have contributed to a golden era of discovery in high-energy physics, hosting experiments that have enabled physicists to unearth the cornerstones of the Standard Model. This success story began 50 years ago with CERN’s Intersecting Storage Rings (featured on the cover of this issue) and culminated in the Large Hadron Collider (p38) – which has spawned thousands of papers in its first 10 years of operations alone (p47). It also bodes well for a potential future circular collider at CERN operating at a centre-of-mass energy of at least 100 TeV, a feasibility study for which is now in full swing. Even hadron colliders have their limits, however. To explore possible new physics at the highest energy scales, physicists are mounting a series of experiments to search for very weakly interacting “slim” particles that arise from extensions in the Standard Model (p25). Also celebrating a golden anniversary this year is the Institute for Nuclear Research in Moscow (p33), while, elsewhere in this issue: quantum sensors HADRON COLLIDERS target gravitational waves (p10); X-rays go behind the scenes of supernova 50 years of discovery 1987A (p12); a high-performance computing collaboration forms to handle the big-physics data onslaught (p22); Steven Weinberg talks about his latest work (p51); and much more. To sign up to the new-issue alert, please visit: http://comms.iop.org/k/iop/cerncourier To subscribe to the magazine, please visit: https://cerncourier.com/p/about-cern-courier EDITOR: MATTHEW CHALMERS, CERN DIGITAL EDITION CREATED BY IOP PUBLISHING ATLAS spots rare Higgs decay Weinberg on effective field theory Hunting for WISPs CCMarApr21_Cover_v1.indd 1 12/02/2021 09:24 CERNCOURIER www. -
Neutrons and Fundamental Symmetries Experimental II: Edms Chen-Yu Liu Indiana University [email protected]
Neutrons and Fundamental Symmetries Experimental II: EDMs Chen-Yu Liu Indiana University [email protected] June 20, 2018 NNPSS 1 Topics I will cover: Lecture 1: beta-decay • A brief history of the electroweak theory---the precursor to the Standard Model. • Neutron decay to test the V-A theory & beyond the SM interactions • Current status with neutron experiments on gA & lifetime • Physics is Symmetries Lecture 2: EDM Q: Why does EDM violate T? • CP violation • Electric Dipole Moments: Highly sensitive low-energy probes of new Physics • muon- g-2 Lecture 3: other symmetry violation measurements/tests • Baryogenesis & symmetry violations • Nnbar oscillation: B violation • Hadronic weak interactions: P violation • NOPTREX: T violation • Neutron interferometry: Lorentz symmetry violation Chen-Yu Liu 2 Mirror (leftright) “Signatures of the Artist,” by S. Vigdor, Oxford University Press(2018) Challenge: Can you find the differences (in three places) between the final and the original picture? Mirror (up down) “Plane-filling motif with reptiles” by M.C. Escher P Blackwhite CP 3 CP T Since time symmetry requires that these time-reversed relative directions be equally probable, it requires that there be no average charge separation along the spin direction, so the EDM must vanish. or If an non-zero EDM is found, then the time reversal symmetry is violated, and through the CPT theorem, the CP is violated by the same amount. 4 Electric Dipole Moment of polar molecules NH3 molecule has two ground states. They are of the same energies (degenerate). Time Reversal J J d d d d J J Electric Dipole Moment of polar molecules NH3 molecule has two ground states. -
CERN Celebrates Discoveries
INTERNATIONAL JOURNAL OF HIGH-ENERGY PHYSICS CERN COURIER VOLUME 43 NUMBER 10 DECEMBER 2003 CERN celebrates discoveries NEW PARTICLES NETWORKS SPAIN Protons make pentaquarks p5 Measuring the digital divide pl7 Particle physics thrives p30 16 KPH impact 113 KPH impact series VISyN High Voltage Power Supplies When the objective is to measure the almost immeasurable, the VISyN-Series is the detector power supply of choice. These multi-output, card based high voltage power supplies are stable, predictable, and versatile. VISyN is now manufactured by Universal High Voltage, a world leader in high voltage power supplies, whose products are in use in every national laboratory. For worldwide sales and service, contact the VISyN product group at Universal High Voltage. Universal High Voltage Your High Voltage Power Partner 57 Commerce Drive, Brookfield CT 06804 USA « (203) 740-8555 • Fax (203) 740-9555 www.universalhv.com Covering current developments in high- energy physics and related fields worldwide CERN Courier (ISSN 0304-288X) is distributed to member state governments, institutes and laboratories affiliated with CERN, and to their personnel. It is published monthly, except for January and August, in English and French editions. The views expressed are CERN not necessarily those of the CERN management. Editor Christine Sutton CERN, 1211 Geneva 23, Switzerland E-mail: [email protected] Fax:+41 (22) 782 1906 Web: cerncourier.com COURIER Advisory Board R Landua (Chairman), P Sphicas, K Potter, E Lillest0l, C Detraz, H Hoffmann, R Bailey -
Optical Stochastic Cooling Experiment at the Fermilab Iota Ring* J
FERMILAB-CONF-18-182-AD OPTICAL STOCHASTIC COOLING EXPERIMENT AT THE FERMILAB IOTA RING* J. D. Jarvis†, V. Lebedev, H. Piekarz, A. L. Romanov, J. Ruan, Fermi National Accelerator Laboratory, Batavia, IL 60510-5011, USA M. B. Andorf, P. Piot1, Northern Illinois University, Dekalb, IL 60115, USA 1also at Fermi National Accelerator Laboratory, Batavia, IL 60510-5011, USA Abstract Beam cooling enables an increase of peak and average luminosities and significantly expands the discovery po- tential of colliders; therefore, it is an indispensable com- ponent of any modern design. Optical Stochastic Cooling (OSC) is a high-bandwidth, beam-cooling technique that Figure 1: Simplified conceptual schematic of an optical will advance the present state-of-the-art, stochastic cool- stochastic cooling section. A wavepacket produced in the ing rate by more than three orders of magnitude. It is an pickup subsequently passes through transport optics and enabling technology for next-generation, discovery- an optical amplifier. In the kicker undulator, each particle science machines at the energy and intensity frontiers receives an energy kick proportional to its momentum including hadron and electron-ion colliders. This paper deviation. presents the status of our experimental effort to demon- strate OSC at the Integrable Optics Test Accelerator (IO- pass through a SC system. In practice, the spectral band- TA) ring, a testbed for advanced beam-physics concepts width, W, of the feedback system (pickup, amplifier, and technologies that is currently being commissioned at kicker) sets a Fourier-limited temporal response T~1/2W, Fermilab. Our recent efforts are centered on the develop- which is very large compared to the intra-particle spacing ment of an integrated design that is prepared for final and limits the achievable cooling rate. -
A Time of Great Growth
Newsletter | Spring 2019 A Time of Great Growth Heartfelt greetings from the UC Riverside Department of Physics and Astronomy. This is our annual newsletter, sent out each Spring to stay connected with our former students, retired faculty, and friends in the wider community. The Department continues to grow, not merely in size but also in stature and reputation. For the 2018-2019 academic year, we were pleased to welcome two new faculty: Professors Thomas Kuhlman and Barry Barish. Professor Kuhlman was previously on the faculty at the University of Illinois at Urbana-Champaign. He joins our efforts in the emerging field of biophysics. His research lies in the quantitative imaging and theoretical modeling of biological systems. He works on genome dynamics, quantification of the activity of transposable elements in living cells, and applications to the engineering of genome editing. Professor Barry Barish, who joins us from Caltech, is the winner of the 2017 Nobel Prize in Physics. He brings great prestige to our Department. Along with Professor Richard Schrock of the Department of Chemistry, who also joined UCR in 2018, UCR now has two Nobel Prize winners on its faculty. Professor Barish is an expert on the detection and physics of gravitational waves. He has been one of the key figures in the conception, construction, and operation of the LIGO detector, where gravitational waves were first discovered in 2015, and which led to his Nobel Prize. He is a member of the National Academy of Sciences and the winner of many other prestigious awards. The discovery of gravitational waves is one of the most exciting developments in physics so far this century. -
Not All Superheroes Were Created Equal
00 gresh fm i-xii, 1-6 8/13/04 1:54 PM Page i THE SCIENCE OF SUPERVILLAINS Lois H. Gresh Robert Weinberg John Wiley & Sons, Inc. 00 gresh fm i-xii, 1-6 8/13/04 1:54 PM Page ii Copyright © 2005 by Lois H. Gresh and Robert Weinberg. All rights reserved Introduction © Chris Claremont. All rights reserved Published by John Wiley & Sons, Inc., Hoboken, New Jersey Published simultaneously in Canada No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600, or on the web at www.copyright.com. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008. Limit of Liability/Disclaimer of Warranty: While the publisher and the author have used their best efforts in preparing this book, they make no representations or warranties with respect to the accuracy or completeness of the contents of this book and specifically disclaim any implied war- ranties of merchantability or fitness for a particular purpose. No warranty may be created or extended by sales representatives or written sales materials. -
After Dinner Speech by Dr
1 After Dinner Speech by Dr. Josef Rembser CERN, Geneva 14 September 2009 Celebration in honour of Professor Herwig Schopper’s 85 th Birthday I. Dear Friends, honourable, dear Professor Schopper! On 28 February of this year, you celebrated your 85th Birthday. This evening we are looking back on this memorable date, wishing you many happy returns of the day. You have been blessed with a life full of harmony and accomplishments, always keeping young physically and intellectually. This is a special blessing granted to a person: Love and family, friendships and encounters, giving and receiving, working and achieving acknowledgements and honours in a fulfilling profession and in challenging missions. Tomorrow, a scientific Colloquium will honour you as researcher and scientific teacher . Today, on the eve of the colloquium, I would like to speak about Herwig Schopper as a research politician and a research manager . My personal remarks and remembrances will focus, dear Herwig Schopper, on the guiding contributions you made in shaping, promoting and advancing science and research and their relevant policies in Germany and in Europe. 2 Professor Heuer, I am grateful for your invitation. It is a pleasure for me to give today's After-Dinner speech in honour of our jubilee. For many years during my service in the German Ministry of Research and Technology (BMFT) in Bonn I had close personal and professional connections with you, dear Professor Schopper, regarding German science and research policy including CERN. II. In 1945, with the end of the 2 nd World War, Germany as guilty party and loser plunged the world and its own country into destruction and suffering, thus experiencing a historical catastrophe. -
Free Electron Lasers and High-Energy Electron Cooling
BROPK EN L LABORATORY NAT,lY BNL-79509-2007-CP Free Electron Lasers and High-Energy Electron Cooling Vladimir N. Litvinenko (BNL), Yaroslav S. Derbenev (TJNAF') Presented at the FEL-07(2ghInternational Free Electron Laser Conference) 'Budker INP, Novosibirsk, Russia August 26-3 1,2007 October 2007 Collider-Accelerator Department Brookhaven National Laboratory P.O. Box 5000 Upton, NY 11973-5000 www.bnl.gov Notice: This manuscript has been authored by employees of Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the US. Depamnent of Energy. The publisher by accepting the manuscript for publication acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world- wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. This preprint is intended for publication in a journal or proceedings. Since changes may be made before publication, it may not be cited or reproduced without the author's permission. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or any third party’s use or the results of such use of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof or its contractors or subcontractors. -
6.2 Transition Radiation
Contents I General introduction 9 1Preamble 11 2 Relevant publications 15 3 A first look at the formation length 21 4 Formation length 23 4.1Classicalformationlength..................... 24 4.1.1 A reduced wavelength distance from the electron to the photon ........................... 25 4.1.2 Ignorance of the exact location of emission . ....... 25 4.1.3 ‘Semi-bare’ electron . ................... 26 4.1.4 Field line picture of radiation . ............... 26 4.2Quantumformationlength..................... 28 II Interactions in amorphous targets 31 5 Bremsstrahlung 33 5.1Incoherentbremsstrahlung..................... 33 5.2Genericexperimentalsetup..................... 35 5.2.1 Detectors employed . ................... 35 5.3Expandedexperimentalsetup.................... 39 6 Landau-Pomeranchuk-Migdal (LPM) effect 47 6.1 Formation length and LPM effect.................. 48 6.2 Transition radiation . ....................... 52 6.3 Dielectric suppression - the Ter-Mikaelian effect.......... 54 6.4CERNLPMExperiment...................... 55 6.5Resultsanddiscussion....................... 55 3 4 CONTENTS 6.5.1 Determination of ELPM ................... 56 6.5.2 Suppression and possible compensation . ........ 59 7 Very thin targets 61 7.1Theory................................ 62 7.1.1 Multiple scattering dominated transition radiation . .... 62 7.2MSDTRExperiment........................ 63 7.3Results................................ 64 8 Ternovskii-Shul’ga-Fomin (TSF) effect 67 8.1Theory................................ 67 8.1.1 Logarithmic thickness dependence -
Quantum Mechanics Quantum Chromodynamics (QCD)
Quantum Mechanics_quantum chromodynamics (QCD) In theoretical physics, quantum chromodynamics (QCD) is a theory ofstrong interactions, a fundamental forcedescribing the interactions between quarksand gluons which make up hadrons such as the proton, neutron and pion. QCD is a type of Quantum field theory called a non- abelian gauge theory with symmetry group SU(3). The QCD analog of electric charge is a property called 'color'. Gluons are the force carrier of the theory, like photons are for the electromagnetic force in quantum electrodynamics. The theory is an important part of the Standard Model of Particle physics. A huge body of experimental evidence for QCD has been gathered over the years. QCD enjoys two peculiar properties: Confinement, which means that the force between quarks does not diminish as they are separated. Because of this, when you do split the quark the energy is enough to create another quark thus creating another quark pair; they are forever bound into hadrons such as theproton and the neutron or the pion and kaon. Although analytically unproven, confinement is widely believed to be true because it explains the consistent failure of free quark searches, and it is easy to demonstrate in lattice QCD. Asymptotic freedom, which means that in very high-energy reactions, quarks and gluons interact very weakly creating a quark–gluon plasma. This prediction of QCD was first discovered in the early 1970s by David Politzer and by Frank Wilczek and David Gross. For this work they were awarded the 2004 Nobel Prize in Physics. There is no known phase-transition line separating these two properties; confinement is dominant in low-energy scales but, as energy increases, asymptotic freedom becomes dominant. -
ISABELLE DESIGN Studyk
© 1973 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. ISABELLE DESIGN STUDYk F. E. Mills Brookhaven National Laboratory Upton, New York Introduction Intersection Regions Following the 1970 BNL Summer Study on AGS Utili- The philosophy of design of the intersection re- zation, John Blewett and I began to consider the design gions is to remove the momentum dispersion, allow the of colliding beam systems in the center of mass energy beam to spread in size, to pass it through a strong range from 200 GeV to 2000 GeV, since it seemed to us lens and bring it to a small focus at the intersection then that significant new phenomena could be expected region (low p). The process is then reversed to return in nuclear interactions in that energy range. We took it to the normal lattice. In some cases (elastic as initial conditions, that we would employ the emer- scattering), the beam is kept large, to obtain good gent technology of superconducting magnets, and that angular resolution. What we have done is to design a we would employ the AGS as the injector, hence requir- "catalog" of intersecting regions, in cooperation with ing the acceleration of the full stored beam to final experimentalists, to fit the needs of particular exper- energies in the storage device. In the summer of 1971, iments. -
Asia Pacific Physics Newsletter
Asia Pacific Physics Newsletter March 2016 Volume 5 • Number 1 worldscinet.com/appn Takaaki Kajita 2015 Physics Nobel Laureate published by Institute of Advanced Studies, Nanyang Technological University (IAS@NTU) and South East Asia Theoretical Physics Association (SEATPA) South East Asia Theoretical Physics Association Asia Pacific Physics Newsletter March 2016 • Volume 5 • Number 1 A publication of the IAS@NTU Singapore and SEATPA Asia Pacific Physics Newsletter publishes articles reporting frontier discoveries in EDITORIAL physics, research highlights, and news to facilitate interaction, collaboration and 3 cooperation among physicists in Asia Pacific physics community. PEOPLE Editor-in-Chief 4 “Observing the Distant Supernova” — Interview with Kok Khoo Phua Nobel Laureate Prof Brian Schmidt Associate Editor-in-Chief “Discovering the W and Z Bosons” — Interview with Swee Cheng Lim Nobel Laureate Prof Carlo Rubbia SEATPA Committee Christopher C Bernido Phil Chan Leong Chuan Kwek Choy Heng Lai Swee Cheng Lim Ren Bao Liu Hwee Boon Low Anh Ký Nguyên Choo Hiap Oh OPINION AND COMMENTARY Kok Khoo Phua 10 China’s Great Scientific Leap Forward: Completion of a Roh Suan Tung Preecha Yupapin planned ‘Great Collider’ would transform particle physics Hishamuddin Zainuddin Freddy Zen Editorial Team NEWS Sen Mu 12 CityU’s Institute for Advanced Study will Champion Bold New Han Sun Chi Xiong Research Initiatives Case made for 'Ninth Planet' Graphic Designers Chuan Ming Loo Erin Ong Cover Photo: "Takaaki Kajita 5171- 2015" by Bengt Nyman - Own work.