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Effect of dead materials on calorimeter response and Monte Carlo simulation

Description: The D0 calorimeter system, cylindrical central calorimeter and two end calorimeters, is constructed with minimal cracks and dead regions in order to provide essentially hermetic coverage over the full solid angle. The effect of the existing few construction features which could perturb the uniformity of the calorimeter is studied in detail with beam tests. The results with the correction algorithms are presented. A comparison with the Monte Carlo simulation is made.
Date: January 1, 1992
Creator: Dharmaratna, W.G.D. (Florida State Univ., Tallahassee, FL (United States). Dept. of Physics)
Partner: UNT Libraries Government Documents Department

Behavior of power-limited transverse stochastic cooling systems

Description: Analysis of stochastic cooling systems is usually done under the assumption that the system performance is not limited by the available electronic gain. In practical systems, it may prove to be the case that cost-induced limitations on the maximum available output power restrict the maximum attainable gain, thereby restricting it to be less than its optimal value. Such is the case in the anti-proton sources at both CERN and Fermilab. The criteria that one would employ in, for example, upgrading such a power-limited system prove to be rather different from those for a system for which one can optimize the gain. In the following sections we first develop the formulas relevant to the behavior of power-limited cooling systems; we limit our treatment throughout to the case of systems which cool the transverse phase space of the beam. We then discuss the implications of our results for the upgrade of such cooling systems, contrasting this case with that for systems in which the electronic gain can be optimized. Finally, we apply our results to the specific case of the Fermilab debuncher ring. 3 refs., 1 fig., 2 tabs.
Date: July 1, 1988
Creator: Goldberg, D.A. & Lambertson, G.R.
Partner: UNT Libraries Government Documents Department

Report from the polarization group of the Fermilab injector workshop

Description: The group considered physics, accelerator, and polarized source issues. Most of the physics study was concerned with what significant and unique experiments could be done if polarized protons could be accelerated in the main injector and eventually in the Tevatron. 12 refs., 4 figs.
Date: July 20, 1989
Creator: Berger, E.; Glass, G.; Imai, K.; Jones, L.; Lin, A.M.T.; Mane, S.R. et al.
Partner: UNT Libraries Government Documents Department

Test beam results from the D0 endcap electromagnetic calorimeter module

Description: We have constructed the endcap electromagnetic modules of the D0 Uranium Liquid Argon Calorimeter. Details of the module design and construction are discussed and initial results from a test beam run with beam momenta ranging from 10--150 GeV/c are presented. We obtain an energy resolution with electron beams of 15.5%/{radical}E(GeV) with a small constant term of {approximately}0.5% and a linearity of better than {plus minus}0.5%. 3 refs., 8 figs.
Date: January 1, 1991
Creator: Spadafora, A.L.
Partner: UNT Libraries Government Documents Department

Physics overview of the Fermilab Low Energy Antiproton Facility Workshop

Description: A physics overview is presented of the Fermilab workshop to consider a possible high flux, low energy antiproton facility that would use cooled antiprotons from the accumulator ring of the Tevatron collider. Two examples illustrate the power of each a facility to produce narrow states at high rates. Physics topics to which such a facility may be applied are reviewed.
Date: May 1, 1986
Creator: Chanowitz, M.S.
Partner: UNT Libraries Government Documents Department

Successful observation of Schottky signals at the Tevatron collider

Description: We have constructed a Schottky detector for the Tevatron collider in the form of a high-Q ({approx}5000) cavity which operates at roughly 2 GHz, well above the frequency at which the Tevatron's single-bunch frequency spectrum begins to roll off. Initial spectra obtained from the detector show clearly observable Schottky betatron lines, free of coherent contaminants; also seen are the common-mode'' longitudinal signals due to the offset of the beam from the detector center. The latter signals indicate that at 2 GHz, the coherent single-bunch spectrum from the detector is reduced by >80 dB; therefore, in normal collider operation, the Schottky betatron lines are >40 dB greater than their coherent counterparts. We describe how the data we have obtained give information on transverse and longitudinal emittances, synchrotron frequency, and betatron tunes, as well as reveal what may be previously unobserved phenomena. Space limitations restrict us to presenting only as much data as should be necessary to convince even the skeptical reader of the validity of the claim made in the paper's title. 3 refs., 2 figs.
Date: August 1, 1989
Creator: Goldberg, D.A. & Lambertson, G.R.
Partner: UNT Libraries Government Documents Department

The odderon versus a new threshold

Description: We show that a new threshold model with a threshold close to but below the UA4 energy is compatible with all forward elastic scattering data at high energies including the widely known UA4 measurement of the forward real part of the elastic p{bar p} scattering amplitude and the recent Fermilab Tevatron Collider experiments of the p{bar p} total cross-section. 14 refs.
Date: October 1, 1991
Creator: Kang, K. (Brown Univ., Providence, RI (United States). Dept. of Physics) & White, A.R. (Argonne National Lab., IL (United States))
Partner: UNT Libraries Government Documents Department

The D[O] upgrade silicon tracker

Description: A large silicon strip tracking detector is planned for the upgrade of the D0 experiment at Fermilab. This detector is designed to gag secondary vertices, to measure the momenta of charged particles and to operate in the high rate environment of the upgraded Tevatron. Details of the detector design are presented here.
Date: November 1, 1992
Creator: Heinson, A.P.
Partner: UNT Libraries Government Documents Department

Magnetic fields and SDC endcap scintillator performance

Description: Many detectors designed to operate in colliders contain both magnetic fields, usually solenoids, and scintillators. The former is known to influence the operation of the latter. A first look is taken in this note at the implications of that influence for the SDC detector.
Date: January 1, 1993
Creator: Green, D.
Partner: UNT Libraries Government Documents Department

A feedback microprocessor for hadron colliders

Description: A feedback microprocessor has been built for the TEVATRON. It has been constructed to be applicable to hadron colliders in general. Its inputs are realtime accelerator measurements, data describing the state of the TEVATRON, and ramp tables. The microprocessor software includes a finite state machine. Each state corresponds to a specific TEVATRON operation and has a state-specific TEVATRON model. Transitions between states are initiated by the global TEVATRON clock. Each state includes a cyclic routine which is called periodically and where all calculations are performed. The output corrections are inserted onto a fast TEVATRON-wide link from which the power supplies will read the realtime corrections. We also store all of the input data and output corrections in a set of buffers which can easily be retrieved for diagnostic analysis. In this paper we will describe this device and its use to control the TEVATRON tunes as well as other possible applications.
Date: December 1, 1992
Creator: Herrup, D.A.; Chapman, L.; Franck, A.; Groves, T. & Lublinsky, B.
Partner: UNT Libraries Government Documents Department

New limits on generation-1 leptoquarks

Description: With the turn-on of HERA there is currently considerable interest in the properties of first-generation leptoquarks. In this paper we present new results of a search for these particles at CDF. Our findings are based on an analysis of 4.1 pb[sup [minus]1] of data collected at [radical]s = 1.8 TeV during the 1988--89 Tevatron run. The leptoquarks are assumed to decay rapidly to first-generation leptons and quarks. We search for an excess of events containing two high energy electrons and two jets and find no events in our signal region. Events outside the signal region are consistent with Z[sup 0] +dijet production. Based on this, and assuming BR(LQ[sub 1][yields] e + q) = 100 %, we exclude first-generation leptoquarks with masses M(LQ[sub 1]) < 113 GeV at the 95% CL. At BR(LQ[sub 1][yields] e + q) = 50 %, we exclude M(LQ[sub 1]) < 82 GeV.
Date: November 1, 1992
Creator: Moulding, S.M. (Brandeis Univ., Waltham, MA (United States))
Partner: UNT Libraries Government Documents Department

The Fermilab upgrade

Description: This paper discusses the upgrades needed at Fermilab Tevatron facility to meet the future physics needs. Historical aspects are also discussed. 3 figs.
Date: September 25, 1988
Creator: Lederman, L.M.
Partner: UNT Libraries Government Documents Department

Status and future prospects for supersymmetry at the Tevatron

Description: We investigate the potential for discovery of super-symmetry during the next Tevatron Collider run in the light of new results fro LEP and CDF.
Date: January 1, 1990
Creator: Amos, N. (Fermi National Accelerator Lab., Batavia, IL (United States)); De, K. (Michigan Univ., Ann Arbor, MI (United States)); White, A. (Florida Univ., Gainesville, FL (United States)) & Yamin, P. (Brookhaven National Lab., Upton, NY (United States))
Partner: UNT Libraries Government Documents Department

Scaling behavior of jet production at CDF

Description: Inclusive jet cross-sections have been measured in [bar p]p collisions at [radical]s = 546 and 1800 GeV, using the CDF detector at the Fermilab Tevatron. The ratio of jet cross-sections is compared to predictions from simple scaling and 0([alpha][sub s[sup 3]]) QCD.
Date: November 1, 1992
Creator: Behrends, S. (Brandeis Univ., Waltham, MA (United States). Dept. of Physics)
Partner: UNT Libraries Government Documents Department

Anti pp searches for quark-gluon plasma at TeV I

Description: Three experiments that have been approved to run at TeV I are discussed from the viewpoint of their capability to search for evidence of the QCD phase transition in proton-antiproton collisions at 1.6 TeV. One of these experiments, E-735, was proposed as a dedicated search for quark-gluon plasma effects with a detector designed to study large total E/sub T/, low P/sub T/ individual particles. The other two, E-741 (CDF) and E-740 (DO), embody general purpose four-pi detectors designed primarily to study the physics of W and Z bosons and other large P/sub T/ phenomena. The detectors and their quark-gluon plasma signals are compared. 8 refs., 6 figs., 4 tabs. (LEW)
Date: June 1, 1986
Creator: Turkot, F.
Partner: UNT Libraries Government Documents Department

1987 DOE review: First collider run operation

Description: This review covers the operations of the first run of the 1.8 TeV superconducting super collider. The papers enclosed cover: PBAR source status, fixed target operation, Tevatron cryogenic reliability and capacity upgrade, Tevatron Energy upgrade progress and plans, status of the D0 low beta insertion, 1.8 K and 4.7 K refrigeration for low-..beta.. quadrupoles, progress and plans for the LINAC and booster, near term and long term and long term performance improvements.
Date: May 1, 1987
Creator: Childress, S.; Crawford, J.; Dugan, G.; Edwards, H.; Finley, D.A.; Fowler, W.B. et al.
Partner: UNT Libraries Government Documents Department

Run control and resource management in the D0 run time system

Description: The D-Zero run time system consists of a number of distinct subsystems which perform the basic functions of triggering, digitizing, data gathering, and data recording. The allocation and high level coordination of the elements in this system are accomplished by a server task which maintains and consults a detailed model of the system. The strengths and weaknesses of this method of operation and the underlying data taking architecture are discussed.
Date: October 1, 1992
Creator: Gibbard, B.
Partner: UNT Libraries Government Documents Department

W and Z decays to electrons in D0

Description: The D0 detector has been accumulating data at the Fermilab Tevatron at [radical]s = 1.8TeV for several months. In this paper we present the results of a preliminary analysis of W and Z vector boson decays into electrons based on 1.1pb[sup [minus]1] of data collected from Aug. 26, 1992 through Nov. 2, 1992. The event characteristics, as well as the number of events detected, are in good agreement with expectations.
Date: November 1, 1992
Creator: Graf, N.A. (Brookhaven National Lab., Upton, NY (United States))
Partner: UNT Libraries Government Documents Department

Theoretical implications of the W-Z mass difference and the capabilities of the D0 detector in measuring it

Description: We examine the phenomenology of the W-Z mass difference as a function of the top quark mass and the Higgs mass. A detailed analysis is presented on how well the mass difference is measurable using the D0 detector at Fermilab. We show that the effective mass distribution of the Z/sup 0/ is not a Breit-Wigner at the Tevatron and present techniques developed for the D0 detector simulation that can be used to reduce the systematic errors in measuring the W-Z mass difference. Scenarios are presented for the integrated luminosities of 10 pb/sup -1/ and 100 pb/sup -1/ at the Tevatron. It is shown that the Tevatron is competitive with LEP II for integrated luminosities of 100 pb/sup -1/ in attainable precisions in this measurement. These considerations argue strongly for the pp option in the Tevatron upgrade program. 17 refs., 14 figs., 2 tabs.
Date: November 1, 1988
Creator: Raja, R.
Partner: UNT Libraries Government Documents Department