Making an Art of Science

Total Page:16

File Type:pdf, Size:1020Kb

Making an Art of Science Volume 21 Friday, August 14, 1998 Number 16 Making an Art of Science Art and science blend elegantly in the work of Fermilab artist Angela Gonzales, leaving a lasting impact on the Laboratory and all who pass through it. Story on page 2. INSIDE f 4 Made in the USA for CMS 6 Acronyms of High-Energy Physics 8 Senate Confirms Richardson at Energy 9 Painless Physics: Spin 10 Park Place Artwork by Angela Gonzales Photos by Reidar Hahn Artist Angela Gonzales retired on July 31 after 31 years at Fermilab. High-Energy Artist Says Good-Bye Angela Gonzales retires after 31 years of creating distinctive designs for Fermilab by Mike Perricone, Office of Public Affairs From the day she arrived in 1967, Angela an individual style, and it removes the Lab from Gonzales’s cover art Gonzales added to Fermilab’s unique character having just the usual conglomerate look of for the 1987 Annual by taking an abstract view of the concrete. mundane plastic or concrete. It gives the Lab Report, celebrating She asked, “Do industrial-style buildings a feeling of being in touch with the arts as well Fermilab’s 20th have to be industrial gray in color?” She as with the sciences.” anniversary. answered with a palette of blue, orange and Both parents were artists, meaning yellow (even apple-green, in the early days) that Gonzales was in touch with the arts beginning was sure to arouse strong reactions but would with her childhood in 1930s Germany. Her never go unnoticed. Included was a row of father’s involvement in modern art, not favored propane tanks whose colors graduated from by Hitler, forced the family to move around orange to yellow. Europe. Gonzales has remained a committed “They didn’t have to be just obvious traveler, visiting her elderly mother annually old gray things,” said Nancy Peoples, wife of in Germany, and journeying to wide-flung Fermilab Director John Peoples, who worked destinations from Costa Rica to Egypt. closely with Gonzales on art committees at the “She once brought me back a bottle of Lab from 1980 until Gonzales’s retirement sand from the Sahara Desert,” said Hazel on July 31. Cramer, Gonzales’s friend and fellow “Her choice of colors gave the Lab a really committee-member though her own 26-year unique touch,” Peoples continued. “It’s such career at the Lab. 2 FermiNews August 14, 1998 Cramer recalled that Gonzales had worked “The next day I happened to see her at at Cornell with Robert Wilson, the Lab’s first the Oak Brook shopping center. I said ‘Hello’ director, and rejoined Wilson at Fermilab to but she didn’t say anything. Then she came work on the design for the site. She noted that back five minutes later, tapped me on the in addition to being an accomplished abstract shoulder and said, ‘I know who you are now. artist, working in a range of media from paint I can say hello.’” to ink to pencil, Gonzales was skilled at Socializing and friendship were separate technical illustration and produced distinctive categories. work for both experimenters and theorists. “If she’s your friend, she is truly your Her designs include the covers for many friend,” Cramer said. “She will not tolerate any of the Lab’s annual reports, including the criticism of a friend, even in a joking way.” commemoration of the Lab’s 20th anniversary After 31 years, Gonzales’s work speaks Judging the merits of an in 1987. forcefully of her contributions. art display in Wilson Hall in “She’s also a very clever writer, although “A lot of her work will be around us, but 1993 are Hanging Committee English is not her native language,” Cramer her day-to-day input will be missing,” said members (left to right) added. “She’s very widely-read, and she has Peoples. “With her retirement, I think the Mizuho Mishima, Nancy Peoples, Saundra Poces a great deal of knowledge in many fields.” Lab loses a lot. It’s almost like losing some and Angela Gonzales. Peoples described Gonzales as having of its original soul.” ■ a keen eye for art and design, and holding high standards. “She does not accept anything that she thinks is substandard,” Peoples said. Gonzales offered a blunt statement of those standards as recently as the holiday season of 1997, when the Wilson Hall atrium was decorated with a series of banners adapted from graphic representations of particle collisions. Not amused, Gonzales wrote to FermiNews and quoted Goethe in giving her judgment: “Den Geschmack kann man nicht am Mittelgut bilden, sondern nur am Allervozueglichsten,” which she translated as: “(Good) taste cannot be achieved by learning from the mediocre (I add trash; there is not even much ‘mediocre’ left to go by) but only from the most excellent.” Cramer, who continues to serve on the Lab’s Auditorium Committee after retirement, has known Gonzales since 1968, and remembers Gonzales’s daughter as “a four-year-old crawling around on the floor and drawing pictures.” But she wryly describes Gonzales as “not a people person.” “Like many artists, she’s very involved with what she is doing at the moment,” Cramer said. “I met her in 1968. I remember being introduced to her, and I said ‘Hello,’ and she said ‘Hello,’ but then she went right on talking (with someone else) as she often does. FermiNews August 14, 1998 3 Made in the USA In the City of Big Shoulders, one of the first American-built parts for the CMS experiment is ready for shipment, thanks to Polish laborers and a Czech prince. by Sharon Butler, Office of Public Affairs Fred Lobkowicz wasn’t doing well last fall. When Lobkowicz fell ill, he was working Photo courtesy of University Rochester Just walking from his desk to the fax machine on a project important to the next generation “Fred Lobkowicz took was a strain. He had had a massive heart attack of particle physics: the design of a large device, me under his wing in in the summer of 1997 and had lost a great a motion table, that would help in testing the 1965, when I was deal of weight. His familiar booming voice Compact Muon Solenoid detector for the a fledgling graduate had thinned. Large Hadron Collider in CERN, the student working with But Lobkowicz hadn’t lost his devotion to European Laboratory for Particle Physics. my mentor John Tinlot physics, nor his intellectual vigor and sardonic The motion table needed to arrive in CERN on a muon storage ring (plus ça change…). In the sense of humor. Of Czech nobility, Lobkowicz by the summer of 1998 to be in time for the ensuing 30-plus years was fluent in English, French, German and next test beam run. from then to U.S. CMS Czech; steeped in history, physics, math and And so, despite deteriorating health, today, Fred was a good philosophy; skilled in mechanical design, Lobkowicz postponed a medical evaluation colleague and a good cryogenic engineering and electronics. With for a heart transplant so that he could review friend who is most a Ph.D. from the Eidgenossische Technische detailed drawings for a bid package requesting sorely missed.” Hochschule in Zurich, where Einstein once quotations for the fabrication of the motion ~ Dan Green, taught, Lobkowicz had earned international table. He signed off on the drawings on U.S. CMS Technical repute for his design and construction of liquid January 8, 1998, and a day later, entered Director argon electromagnetic calorimeters: complex the hospital. devices consisting of multiple layers of lead or On February 3, 1998, Lobkowicz died. uranium and copper-clad circuit boards, He was 65. immersed in hundreds of gallons of liquid Almost two centuries earlier, in 1804, argon maintained at very cold temperatures. Ludwig van Beethoven had dedicated his third Such devices have been key components of symphony, “Eroica,” to one of Lobkowicz’s detectors used at Fermilab—in the discovery ancestors (presumably after the temperamental, of the top quark and in the study of gluons. and disappointed, composer tore up his homage to Napoleon). This year, Lobkowicz’s colleagues dedicated the motion table to him. Testing the detector The motion table is a crucial piece of heavy equipment for the CMS experiment. It will allow the collaboration to calibrate and test the performance of their detector. The size of a five-story building, the CMS detector includes numerous specialized components. Nearest the beam are tracking devices so sensitive that they can measure the trajectory of a single particle to better than a thousandth of an inch. In layers surrounding these devices are, in order, the electromagnetic calorimeter, the hadronic calorimeter, a superconducting solenoid, steel, and muon chambers—components designed to measure the energies and identities of the particles George Ginther has emerging from the collision of protons inside. been finetuning the But will all these components perform the controls for the motion way they are supposed to? To ensure that they table, currently residing will, a section of the detector will be tested with on the factory floor of a beam extracted from CERN’s SPS accelerator. Industrial Maintenance The problem is: the beam follows a strait and in South Chicago. narrow path; in collisions, particles fly off in Photo by Reidar Hahn every direction. 4 FermiNews August 14, 1998 That’s where the motion table comes in, a 40-ton platform capable of holding a 40-degree wedge of the detector, from the tracking devices out to the first of the muon chambers. The motion table allows the detector to be moved around the beam, as if particles from collisions were hitting the detector from multiple angles.
Recommended publications
  • Supersymmetry Searches at the Tevatron
    SUPERSYMMETRY SEARCHES AT THE TEVATRON For CDF and DØ collaborations R. Demina Department of Physics and Astronomy, University of Rochester, Rochester, USA, 14627 CDF and DØ collaborations analyzed up to 200 pb-1 of the delivered data in search for different supersymmetry signatures, so far with negative results. We present results on searches for chargino and neutralino associated production, squarks and gluinos, sbottom quarks, gauge mediated SUSY breaking and long lived heavy particles. Supersymmetry1 is a popular extension of the Standard Model originally suggested over 25 years ago. It postulates the symmetry between fermionic and bosonic degrees of freedom. As a result a variety of hypothetical particles is introduced. With presently available experimental data physicists were able to prove that if supersymmetric particles exist they must be heavier than their Standard Model partners2. In other words the Supersymmetry is broken. One possible exception is supersymmetric top quark (stop), which still has a chance to be lighter or of the same mass as top quark. With 2-4 fb-1 of data Tevatron experiments will be able to extend the limit on stop mass above that of top quark or discover it and thus establish the Supersymmetry3. Theory suggests several possible scenarios of Supersymmetry breaking mediated by gravitational or gauge interactions. In gravity mediated scenarios the number of free parameters in the model is reduced to five because of the unification of masses and couplings imposed at the grand unification scale. These parameters are M0 (M½) – masses of all bosons (fermions) at GUT scale, A0- trilinear coupling and µ0 – something Higgs and tan(β) – ratio of vacuum expectations of the Higgs doublet.
    [Show full text]
  • Three Extra Mirror Or Sequential Families: a Case for Heavy Higgs and Inert Doublet
    Three Extra Mirror or Sequential Families: a Case for Heavy Higgs and Inert Doublet Homero Mart´ınez,1 Alejandra Melfo,2, 3 Fabrizio Nesti,4 and Goran Senjanovi´c2 1CEA, Saclay, DSM-IRFU-SPP, France 2ICTP, Trieste, Italy 3U. de Los Andes, M´erida, Venezuela 4U. di Ferrara, Ferrara, Italy (Dated: October 24, 2018) We study the possibility of the existence of extra fermion families and an extra Higgs doublet. We find that requiring the extra Higgs doublet to be inert leaves space for three extra families, allowing for mirror fermion families and a dark matter candidate at the same time. The emerging scenario is very predictive: it consists of a Standard Model Higgs boson, with mass above 400 GeV, heavy new quarks between 340 and 500 GeV, light extra neutral leptons, and an inert scalar with a mass below MZ . PACS numbers: 14.65.Jk, 12.60.Fr, 14.60.Hi, 14.60.St Introduction. It may not be well known that the idea with regard to high precision analysis they behave exactly of parity restoration in weak interactions is as old as as ordinary fermions, and thus a reader who is uncom- the suggestion of its breakdown. In their classic paper, fortable with the above setbacks can view our study as Lee and Yang [1] proposed the existence of what we will referring to the more general question of whether the SM call mirror fermions, so as to make the world left-right can host three (or more) extra families. symmetric at high energies. By this they meant another If one defines the SM by its structure, i.e.
    [Show full text]
  • Bright Prospects for Tevatron Run II
    INTERNATIONAL JOURNAL OF HIGH-ENERGY PHYSICS CERN COURIER VOLUME 43 NUMBER 1 JANUARY/FEBRUARY 2003 Bright prospects for Tevatron Run II JLAB Virginia laboratory delivers terahertz light p6 ^^^J Modular and expandable power supplies WÊ H Communications via TCP/IP içert. n_.___910S.CAEN '^^^*aBOKS^^^^ • ÊÊÊ WÊÊÊSêSê É TÏSjj à OPC Server to ease integration in DCS J Directly interfaced to JCOP Framework p " j^pj ^ ^^^^ Wa9neticFie,dand^ ^^HTJHj^^^^^^^^^^^^^^^^^^^^^^E' ' tfHl far IM Éfefi-*il * CAEN: your largest choice of HV & LV )^ H MULTICHANNEL POWER SUPPLIES CONTENTS 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. Editors James Gillies and Christine Sutton CERN, 1211 Geneva 23, Switzerland Email [email protected] Fax+41 (22) 782 1906 Web cerncourier.com COURIER Advisory Board R Landua (Chairman), F Close, E Lillest0l, VOLUME 43 NUMBER 1 JANUARY/FEBRUARY 2003 H Hoffmann, C Johnson, K Potter, P Sphicas Laboratory correspondents: Argonne National Laboratory (US): D Ayres Brookhaven, National Laboratory (US): PYamin Cornell University (US): D G Cassel DESY Laboratory (Germany): Ilka Flegel, P Waloschek Fermi National Accelerator Laboratory (US): Judy Jackson GSI Darmstadt (Germany): G Siegert INFN
    [Show full text]
  • Tevatron Accelerator Physics and Operation Highlights A
    FERMILAB-CONF-11-129-APC TEVATRON ACCELERATOR PHYSICS AND OPERATION HIGHLIGHTS A. Valishev for the Tevatron group, FNAL, Batavia, IL 60510, U.S.A. Abstract Table 1: Integrated luminosity performance by fiscal year. The performance of the Tevatron collider demonstrated FY07 FY08 FY09 FY10 continuous growth over the course of Run II, with the peak luminosity reaching 4×1032 cm-2 s-1, and the weekly Total integral (fb-1) 1.3 1.8 1.9 2.47 -1 integration rate exceeding 70 pb . This report presents a review of the most important advances that contributed to Until the middle of calendar year 2009, the luminosity this performance improvement, including beam dynamics growth was dominated by improvements of the antiproton modeling, precision optics measurements and stability production rate [2], which remains stable since. control, implementation of collimation during low-beta Performance improvements over the last two years squeeze. Algorithms employed for optimization of the became possible because of implementation of a few luminosity integration are presented and the lessons operational changes, described in the following section. learned from high-luminosity operation are discussed. Studies of novel accelerator physics concepts at the Tevatron are described, such as the collimation techniques using crystal collimator and hollow electron beam, and compensation of beam-beam effects. COLLIDER RUN II PERFORMANCE Tevatron collider Run II with proton-antiproton collisions at the center of mass energy of 1.96 TeV started in March 2001. Since then, 10.5 fb-1 of integrated luminosity has been delivered to CDF and D0 experiments (Fig. 1). All major technical upgrades of the accelerator complex were completed by 2007 [1].
    [Show full text]
  • 01Ii Beam Line
    STA N FO RD LIN EA R A C C ELERA TO R C EN TER Fall 2001, Vol. 31, No. 3 CONTENTS A PERIODICAL OF PARTICLE PHYSICS FALL 2001 VOL. 31, NUMBER 3 Guest Editor MICHAEL RIORDAN Editors RENE DONALDSON, BILL KIRK Contributing Editors GORDON FRASER JUDY JACKSON, AKIHIRO MAKI MICHAEL RIORDAN, PEDRO WALOSCHEK Editorial Advisory Board PATRICIA BURCHAT, DAVID BURKE LANCE DIXON, EDWARD HARTOUNI ABRAHAM SEIDEN, GEORGE SMOOT HERMAN WINICK Illustrations TERRY ANDERSON Distribution CRYSTAL TILGHMAN The Beam Line is published quarterly by the Stanford Linear Accelerator Center, Box 4349, Stanford, CA 94309. Telephone: (650) 926-2585. EMAIL: [email protected] FAX: (650) 926-4500 Issues of the Beam Line are accessible electroni- cally on the World Wide Web at http://www.slac. stanford.edu/pubs/beamline. SLAC is operated by Stanford University under contract with the U.S. Department of Energy. The opinions of the authors do not necessarily reflect the policies of the Stanford Linear Accelerator Center. Cover: The Sudbury Neutrino Observatory detects neutrinos from the sun. This interior view from beneath the detector shows the acrylic vessel containing 1000 tons of heavy water, surrounded by photomultiplier tubes. (Courtesy SNO Collaboration) Printed on recycled paper 2 FOREWORD 32 THE ENIGMATIC WORLD David O. Caldwell OF NEUTRINOS Trying to discern the patterns of neutrino masses and mixing. FEATURES Boris Kayser 42 THE K2K NEUTRINO 4 PAULI’S GHOST EXPERIMENT A seventy-year saga of the conception The world’s first long-baseline and discovery of neutrinos. neutrino experiment is beginning Michael Riordan to produce results. Koichiro Nishikawa & Jeffrey Wilkes 15 MINING SUNSHINE The first results from the Sudbury 50 WHATEVER HAPPENED Neutrino Observatory reveal TO HOT DARK MATTER? the “missing” solar neutrinos.
    [Show full text]
  • Fermi National Accelerator Laboratory 132 Nsec Bunch Spacing in The
    Fermi National Accelerator Laboratory FERMILAR-TM-1920 132 nsec Bunch Spacing in the Tevatron Proton-Antiproton Collider S. D. Holmes et al. Fermi National Accelerator Laboratory P.O. Box 500, Batavia, Illinois 60510 December 1994 0 Operated by Universities Research Association Inc. under Contract No. DE-ACOZ-76CH030W with the United States Department of Energy 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, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infn’nge 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 The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof 132 nsec Bunch Spacing in the Tevatron Proton-Antiproton Collider SD. Holmes, J. Holt, J.A. Johnstone, J. Marriner, M. Martens, D. McGinnis Fermi National Accelerator Laboratory December 23, 1994 Abstract Following completion of the Fermilah Main Injector it is expected that the Tevatron proton-antiproton collider will be operating at a luminosity in excess of 5x1031 cm-%ec-1 with 36 proton and antiproton bunches spaced at 396 nsec. At this luminosity, each of the experimental detectors will see approximately 1.3 interactions per crossing.
    [Show full text]
  • MASTER -••••-".>; I~CN of TH;3 DOCUMENT 18 Unlfmfts DISCLAIMER
    i ' Do^y^W-S- 2 Progress report 2.1 The D0 Experiment The D0 detector had its first data run in the period May 1992 till June 1993. The first two thirds of the run period were characterized by low luminosity and frequent machine development periods. The luminosity gradually climbed, and the machine ultimately delivered 31 pb_1 to the experiment. The detector performed admirably well, and data analysis tracked data taking closely. The overall D0 efficiency was 54% and 16.7 pb_1 of data were collected; due to high backgrounds during Main Ring injection and transition, and beam gas interactions in the MR pipe that intersects our calorimeter, triggers in D0 were vetoed for about 29% of the store time; data acquisition busy (7%), experiment down time (5%), and run startup overhead (5%) added another 17% to the inefficiency. Many cycles of reconstruction software upgrade were done as experience with real data was gained, bugs were corrected, and new data corrections were added. First results were presented at the Spring 1993 APS meeting, the Summer conferences, and at the Fall 1993 pp symposium in Tsukuba. Several papers (See Attached [LeptoQuark PRL, RapGap PRL, Top PRL]) have appeared in print, a lepto-quark search, a rapidity-gap study, and. a lower mass limit on the Standard Model top quark where we also present a spectacular event that has laxge $y, a high energy electron and a high momentum muon, both isolated, and two sizable jets. When interpreted as a it event, a top mass around 145 GeV (with a large 30 GeV error) is obtained.
    ; I~CN of TH;3 DOCUMENT 18 Unlfmfts DISCLAIMER" class="panel-rg color-a">[Show full text]
  • Future Hadron Physics at Fermilab
    Future Hadron Physics at Fermilab Jeffrey A. Appel Fermi National Accelerator Laboratory PO Box 500, Batavia, IL 60510 USA [email protected] Abstract. Today, hadron physics research occurs at Fermilab as parts of broader experimental programs. This is very likely to be the case in the future. Thus, much of this presentation focuses on our vision of that future – a future aimed at making Fermilab the host laboratory for the International Linear Collider (ILC). Given the uncertainties associated with the ILC - the level of needed R&D, the ILC costs, and the timing - Fermilab is also preparing for other program choices. I will describe these latter efforts, efforts focused on a Proton Driver to increase the numbers of protons available for experiments. As examples of the hadron physics which will be coming from Fermilab, I summarize three experiments: MIPP/E907 which is running currently, and MINERνA and Drell-Yan/E906 which are scheduled for future running periods. Hadron physics coming from the Tevatron Collider program will be summarized by Arthur Maciel in another talk at Hadron05. Keywords: Fermilab, Tevatron, ILC, hadron, MIPP, MINERνA, Drell-Yan, proton driver. PACS: 13.85.-t INTRODUCTION In order to envisage the future of hadron physics at Fermilab, it will be useful to know the research context at the Laboratory. That can be best done by looking at the recent presentations by Fermilab's new Director, Piermaria Oddone, who began his tenure as Director on July 1, 2005. Pier has had several opportunities to project the vision of Fermilab's future, both inside the Laboratory and to outside committees.1 I draw heavily on his presentations.
    [Show full text]
  • Status of New Physics Searches at the Tevatron
    DIS 2011 Newport News, VA Status of New Physics Searches at the Tevatron Craig Group (University of Virginia and Fermilab) on behalf of the CDF and D0 experiments… Outline Searches at the Tevatron • The Tevatron, CDF, and D0 • Dilepton/diphoton resonances • Diboson resonances • Complex final states (MET, jets, H.F.) • Higgs (SM) • Higgs (non‐SM) DIS2011 C. Group ‐ Review of Searches at the Tevatron 2 The Tevatron at Fermilab The Tevatron currently provides the high energy proton‐anproton collisions: Ecm = 1.96 TeV CDF DO Tevatron DIS2011 C. Group ‐ Review of Searches at the Tevatron 3 The Tevatron is… …and has been a Discovery Machine! Results shown today include 4‐8 ‐1 Single Top Rare Bs decays Diboson Channels Y(4140) Bs ΦΦ Charm mixing ZZ WZ Z+b Bs‐mixing Exclusive charm Exclusive ee Top Quark DIS2011 C. Group ‐ Review of Searches at the Tevatron 4 Dilepton Final States Old‐fashioned bump hunt in Mee distribuon: CDF: 5.7‐1 ‐Z producon and decay into ee/µµ precisely measured D0: 5.4‐1 ‐Lepton ID/Reco and Trigger efficiencies high and very well understood ‐Background low and easily determined (QCD fakes) ‐Clean events PLB 695, 88 (2011) CDF Public Note 10405 DIS2011 C. Group ‐ Review of Searches at the Tevatron 5 Dilepton Final States Old‐fashioned bump hunt in Mee distribuon: CDF: 5.7‐1 ‐Z producon and decay into ee/µµ precisely measured 2 D0: 5.4‐1 ‐Lepton ID/Reco and Trigger efficiencies high and very well understood = 960 GeV/c ‐Background low and easily determined (QCD fakes) Mee ‐Clean events PLB 695, 88 (2011) CDF Public Note 10405 event ever recorded! dilepton the highest DIS2011 C.
    [Show full text]
  • Physicists Raid Tevatron for Parts Fermilab Icon Plundered Amid Tight Budgets and Shifting Scientific Aims
    IN FOCUS NEWS HIGH-ENERGY PHYSICS Physicists raid Tevatron for parts Fermilab icon plundered amid tight budgets and shifting scientific aims. BY EUGENIE SAMUEL REICH CANNIBALIZING THE TEVATRON Parts at the Tevatron and its two main experiments, the CDF and D0, are being t is a 4,000-tonne edifice that stands three considered for recycling in the wake of the collider’s closure in September 2011. stories high, chock full of particle detectors, Antiproton power supplies, electronics and photo­ source Imultiplier tubes, all layered like a giant onion Possibly open around a cylindrical magnet. During 26 years Booster of operation at the Fermi National Accelerator to visitors Laboratory in Batavia, Illinois, this behemoth, Main injector the Collider Detector at Fermilab (CDF), and recycler helped to find the top quark and chased the • Photomultiplier tubes for Higgs boson. But since the lab’s flagship parti- nuclear-structure experiment CDF cle collider, the Tevatron, was switched off in • Electronics for the Large September 2011, the detector has been surplus Hadron Collider in Europe • Central magnet for a stock — and it is now slowly being cannibal- possible particle-decay ized for parts. Beams repurposed experiment When the Tevatron closed, Fermilab for neutrino and • Possible educational display announced that the CDF would become an other experiments educational display. Along with its companion experiment, D0, the detector was supposed to form the centre­piece of a tour through simu- Tevatron lated control rooms and decommissioned Possible educational display accelerator tunnels. But tight budgets for experimental particle physicists — combined 500 m with their tendency to tinker and recycle — are pushing the outcome in a different direction, D0 at least for the CDF.
    [Show full text]
  • Tevatron Runii Performance and Plans
    Proceedings of EPAC 2002, Paris, France TEVATRON RUN II PERFORMANCE AND PLANS M. Church†, FNAL*, Batavia, IL 60510, USA Abstract The Fermilab accelerator complex has been operating 2 CURRENT STATUS AND ISSUES Run II for approximately one year. In this mode 36 Table 1 lists the current status of important Collider proton bunches collide with 36 antiproton bunches at 2 parameters along with the Run IIa goals for 2002. interaction regions in the Tevatron at 980 GeV beam energy. The long range goal in Run II is to obtain a total Table 1: Important Run IIa parameters. Column 2 shows -1 best values on 1/1/2002, column 3 shows best values on integrated luminosity of 15 pb . The current status and performance of the accelerator complex is described, 5/25/2002, and column 4 shows goals for 1/1/2003 including the Tevatron, Main Injector, Antiproton Source, Parameter 1/1/02 5/25/02 1/1/03 and Recycler Ring. Future upgrade plans and prospects goal for reaching the admittedly ambitious long range goal are presented. antiproton production 10 11 18 rate (E10/hr) 1 COLLIDER OPERATIONS AT Accumulator core size 115 120 165 FERMILAB (E10) There are 2 basic modes during Collider operation: antiproton transfer .23 .37 .80 antiproton stacking and "shots." A shot is the process of efficiency loading the Tevatron with protons and antiprotons. In stacking mode, a batch of 84 53MHz proton antiprotons/bunch @ 7.6 10.8 33 bunches is extracted from the Booster Ring at 8 GeV and low beta (E9) injected into the MI (Main Injector) every 2.2 seconds.
    [Show full text]
  • Arxiv:1005.3797V2 [Hep-Ph]
    FERMILAB-PUB-10-143-T The Tevatron at the Frontier of Dark Matter Direct Detection Yang Bai, Patrick J. Fox and Roni Harnik Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510, USA Abstract Direct detection of dark matter (DM) requires an interaction of dark matter particles with nucleons. The same interaction can lead to dark matter pair production at a hadron collider, and with the addition of initial state radiation this may lead to mono-jet signals. Mono-jet searches at the Tevatron can thus place limits on DM direct detection rates. We study these bounds both in the case where there is a contact interaction between DM and the standard model and where there is a mediator kinematically accessible at the Tevatron. We find that in many cases the Tevatron provides the current best limit, particularly for light dark matter, below 5 GeV, a and for spin dependent interactions. Non-standard dark matter candidates are also constrained.∼ The introduction of a light mediator significantly weakens the collider bound. A direct detection discovery that is in apparent conflict with mono-jet limits will thus point to a new light state coupling the standard model to the dark sector. Mono-jet searches with more luminosity and including the spectrum shape in the analysis can improve the constraints on DM-nucleon scattering cross section. arXiv:1005.3797v2 [hep-ph] 24 Dec 2010 1 Introduction From astronomical and cosmological observations it is now clear that 25% of the matter-energy ∼ content of the universe if made up by dark matter (DM).
    [Show full text]