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Measuring the mass and width of the Z sup 0 : The status of the energy spectrometers

Description: The Stanford Linear Collider (SLC) located at the Stanford Linear Accelerator Center (SLAC) collides electrons and positrons produced in the linear accelerator pulse by pulse. The object is to produce collisions energetic enough to produce the heavy intermediate vector boson, the Z{sup 0}. An essential component of the SLC physics program is the precise knowledge of the center-of-mass energy of each interaction. We measure the energy of each collision by using two energy spectrometers. The spec… more
Date: May 1, 1989
Creator: Rouse, F.; Levi, M. (Lawrence Berkeley Lab., CA (United States)); Kent, J.; King, M.; Von Zanthier, C.; Watson, S. (California Univ., Santa Cruz, CA (United States)) et al.
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Partner: UNT Libraries Government Documents Department
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The Mark II Silicon Strip Vertex Detector and performance of a silicon detector telescope in the Mark II detector at the SLC

Description: A Silicon Strip Vertex Detector (SSVD) consisting of 36 independent silicon detector modules has been built for use in the Mark II detector at the SLAC Linear Collider (SLC). We discuss the performance of the individual modules and the stability and accuracy of their placement in the mechanical support. To gain operational experience at the SLC, we have assembled and placed inside the Mark II a telescope made of three Silicon Detector Modules. We present results from the first data run of the S… more
Date: December 1, 1989
Creator: Labarga, L.; Adolphsen, C.; Gratta, G.; Litke, A.; Turala, M.; Zaccardelli, C. (California Univ., Santa Cruz, CA (USA). Inst. for Particle Physics) et al.
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Partner: UNT Libraries Government Documents Department
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Electron beam and high-speed optical diagnostics for the Los Alamos HIBAF (High Brightness Accelerator FEL) Facility

Description: Characterization of the electron beam's properties will be a major task after the upgrade of the Los Alamos Free-Electron Laser (FEL) Facility with a photoelectric injector (PEI) and increased acceleration capability to 40 MeV. Adjustments to the previous diagnostics package that address the lower beam emittance, higher energy, and wakefield source reduction issues will be discussed. 6 refs., 8 figs., 1 tab.
Date: January 1, 1989
Creator: Lumpkin, A. H.; Cornelius, W. D.; Stein, W. E.; Feldman, R. B.; Meier, K. L. & Young, L. M.
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Partner: UNT Libraries Government Documents Department
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High intensity linear accelerator development topics for panel discussion on Nuclear Energy Research and Accelerators: Future Prospects''

Description: Two companion papers at this meeting have introduced the subject of high intensity linacs for materials research and for radioactive waste transmutation; Prof. Kaneko's paper Intense Proton Accelerator,'' and my paper Accelerator-Based Intense Neutron Source for Materials R D.'' I will expand on those remarks to briefly outline some of the extensive work that has been done at Los Alamos toward those two application areas, plus a third --- the production of tritium in an accelerator-based facili… more
Date: January 1, 1989
Creator: Jameson, Robert A.
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Partner: UNT Libraries Government Documents Department
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Superconducting magnets in high radiation environments: Design problems and solutions

Description: As part of the Stanford Linear Collider Project, three high-field superconducting solenoid magnets are used to rotate the spin direction of a polarized electron beam. The magnets are installed in a high-radiation environment, where they will receive a dose of approximately 10{sup 3} rad per hour, or 10{sup 8} rad over their lifetimes. This level of radiation and the location in which the magnets are installed, some 10 meters below ground in contiguous tunnels, required careful selection of mate… more
Date: November 1, 1989
Creator: St. Lorant, S.J. & Tillmann, E.
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Partner: UNT Libraries Government Documents Department
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A five-picosecond electron pulse from ANL (Argonne National Laboratory) L-Band Linac

Description: The pulse-compression system of the Argonne National Laboratory Chemistry Division L-Band Linac, presented at the 1986 Linear Accelerator Conference at Stanford, California, has been completed. A five-picosecond-wide electron pulse containing 6 {times} 10{sup {minus}9} coulomb charge has been achieved. Acceleration parameters and the pulse-width measurement technique are discussed, and future plans for the utilization of this pulse in radiation chemistry studies are presented. 5 refs., 4 figs.
Date: January 1, 1989
Creator: Cox, G. L.; Jonah, C. D.; Ficht, D. T.; Mavrogenes, G. S. & Sauer, M. C. Jr.
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Partner: UNT Libraries Government Documents Department
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A measurement of the Z boson resonance parameters at the SLC (Stanford Linear Center)

Description: We have measured the resonance parameters of the Z boson using 480 hadronic and Leptonic Z decays collected by the Mark II Detector at the Stanford Linear Collider. We find the Mass to be 91.14 {+-} 0.12 GeV/c{sup 2}, and the width to be 2.42{sup +0.45}{sub {minus}0.35} GeV. If we constrain the visible width to its Standard Model value, we find a partial width to invisible decay modes corresponding to 2.8 {+-} 0.6 neutrino species with a 95% confidence level limit of 3.9. 9 refs., 1 fig., 4 tab… more
Date: November 1, 1989
Creator: Nash, J.
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Partner: UNT Libraries Government Documents Department
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Proton linac for hospital-based fast neutron therapy and radioisotope production

Description: Recent developments in linac technology have led to the design of a hospital-based proton linac for fast neutron therapy. The 180 microamp average current allows beam to be diverted for radioisotope production during treatments while maintaining an acceptable dose rate. During dedicated operation, dose rates greater than 280 neutron rads per minute are achievable at depth, DMAX = 1.6 cm with source to axis distance, SAD = 190 cm. Maximum machine energy is 70 MeV and several intermediate energie… more
Date: September 1, 1989
Creator: Lennox, A. J.; Hendrickson, F. R.; Swenson, D. A.; Winje, R. A.; Young, D. E. (Fermi National Accelerator Lab., Batavia, IL (USA); Rush Univ., Chicago, IL (USA) et al.
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Partner: UNT Libraries Government Documents Department
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Final focus test beam alignment: A draft proposal

Description: The Final Focus Test Beam is a transport line designed to transmit 50 GeV electron beams of SLC emittance (3 {times} 10{sup {minus}10} radian-meters) straight through the central arm of the Beam Switchyard (BSY C line) with a final focus point out in the Research Yard but relatively near the end of the switchyard tunnel. The hardware, methods and procedures outlined in this proposal are dedicated to measuring the placement of mechanical objects with respect to certain defined geometric axes. We… more
Date: March 1, 1989
Creator: Fischer, G. E. & Ruland, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Monitor and control systems for the SLD Cherenkov Ring Imaging Detector

Description: To help ensure the stable long-term operation of a Cherenkov Ring Detector at high efficiency, a comprehensive monitor and control system is being developed. This system will continuously monitor and maintain the correct operating temperatures, and will provide an on-line monitor and maintain the correct operating temperatures, and will provide an on-line monitor of the pressures, flows, mixing, and purity of the various fluids. In addition the velocities and trajectories of Cherenkov photoelec… more
Date: October 1, 1989
Creator: Antilogus, P.; Aston, D.; Bienz, T.; Bird, F.; Dasu, S.; Dunwoodie, W. et al.
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Partner: UNT Libraries Government Documents Department
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Study of hadronic final states of Z boson decays

Description: We have studied hadronic final states produced in the decays of Z bosons using the Mark II detector at SLC. We have measured the distributions of global shape parameters, inclusive charged particle distributions, charge particle multiplicity and jet multiplicity. The results are compared to predictions of QCD-based models optimized at the PEP energy. The data and models agree within the present statistical precision. We have also investigated a new method to determine the QCD scale parameter {L… more
Date: October 1, 1989
Creator: Komamiya, S.
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Partner: UNT Libraries Government Documents Department
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GENI: A graphical environment for model-based control

Description: A new method to operate machine and beam simulation programs for accelerator control has been developed. Existing methods, although cumbersome, have been used in control systems for commissioning and operation of many machines. We developed GENI, a generalized graphical interface to these programs for model-based control. This object-oriented''-like environment is described and some typical applications are presented. 4 refs., 5 figs.
Date: October 1, 1989
Creator: Kleban, S.; Lee, M. & Zambre, Y.
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Partner: UNT Libraries Government Documents Department
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Precision measurements of the SLC reference magnets

Description: Two spectrometers, one on each extraction line of the SLC, have been installed to momentum analyse each SLC beam pulse and determine the electron and positron beam energies. A method of determining and monitoring the absolute magnetic field strength for these dipoles has been developed. A total error on the magnetic field integral of {delta}{integral}Bdl/{integral}Bdl = 1 {times} 10{sup {minus}4} has been achieved. The field integral can be monitored continuously during SLC beam operation using… more
Date: March 1, 1989
Creator: Watson, S.; Levi, M. & Nash, J.
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Partner: UNT Libraries Government Documents Department
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SLC status and SLAC (Stanford Linear Accelerator Center) future plans

Description: In this presentation, I shall discuss the linear collider program at the Stanford Linear Accelerator Center as it is now, and as we hope to see it evolve over the next few years. Of greatest interest to the high energy accelerator physics community gathered here is the development of the linear collider concept, and so I shall concentrate most of this paper on a discussion of the present status and future evolution of the SLC. I will also briefly discuss the research and development program tha… more
Date: August 1, 1989
Creator: Richter, B.
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Partner: UNT Libraries Government Documents Department
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An immersed field cluster klystron

Description: Future linear colliders have a need for high power, high frequency, and short-pulse radio frequency sources. The proposed ''cluster klystron'' should give over 1 GW of 12 GHz radio frequency power, can employ direct current or a long high-voltage pulse, but can be gated to give pulses down to a few tens of nanoseconds. The device consists of 42 parallel 100 A channels. Each channel is fed from an individual magnetron-type gun employing a common 50 kV mod-anode. The beams are accelerated to 400 … more
Date: August 1, 1989
Creator: Palmer, R. B.; Herrmannsfeldt, W. B. & Eppley, K. R.
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Partner: UNT Libraries Government Documents Department
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Z sup 0 physics from the Mark II at the SLC (SLAC Linear Collider)

Description: The MARK II detector has started to take data at the new SLAC Linear Collider. The novel aspects of the accelerator and of the MARK II are briefly described. Displays of event pictures from some of the early-on data are presented to illustrate the quality of the data. A first presentation of the results of an energy scan near the Z{sup 0} mass that is currently in progress shows the expected resonant enhancement near 91 GeV. 2 refs., 23 figs., 1 tab.
Date: June 1, 1989
Creator: Abrams, G.S. (Lawrence Berkeley Lab., CA (USA))
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Partner: UNT Libraries Government Documents Department
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Compact rf-linac free-electron lasers

Description: Design studies using the INEX simulation methods are presented for an infrared compact rf-linac-driven FEL. The possibility of such a device relies upon two technological advances: a very bright electron beam from a linac with a photocathode injector, and a short-period, high-field wiggler. 10 refs., 6 figs., 3 tabs.
Date: January 1, 1989
Creator: Goldstein, J.C.; Sheffield, R.L.; Carlsten, B.E. & Warren, R.W.
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Partner: UNT Libraries Government Documents Department
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Optimizing the average longitudinal phase of the beam in the SLC linac

Description: The relation of the beam's average linac phase, {phi}{sub 0}, to the final energy spectrum in the SLC linac has been studied by many people over the years, with much of the work left unpublished. In this note we perform a somewhat thorough in vestigation of the problem. First we describe the calculation method, and discuss some common features of the energy spectrum. Then we calculate the value of {phi}{sub 0} that minimizes {delta}{sub rms} for the conceivable range of bunch population and bun… more
Date: September 1, 1989
Creator: Bane, K.L.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Advanced Light Source Linac subharmonic buncher cavities

Description: The Linear Accelerator (Linac) in the Advanced Light Source (ALS) is designed to provide either single or multiple bunches of 50 MeV electrons for the booster synchrotron. Three bunchers are used in the Linac. The 3 GHz S band buncher has been described elsewhere. This report deals with the two lower subharmonic bunchers. One operates at 124.914 MHz while the other operates at 499.654 MHz. 12 refs., 2 figs.
Date: March 1, 1989
Creator: Lo, C.C.; Taylor, B.; Lancaster, H. & Guigli, J.
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Partner: UNT Libraries Government Documents Department
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Operational experience of the ATLAS accelerator

Description: The ATLAS accelerator consists of a HVEC model FN tandem accelerator injecting into a linac of independently-phased niobium superconducting resonators. The accelerator provides beams with masses from 6{le}A{le}127 and with energies ranging up to 20 MeV/A for the lightest ions and 4 MeV/A for the heaviest ions. Portions of the linac have been in operation since 1978 and, over the last decade, more than 35,000 hours of operating experience have been accumulated. The long-term stability of niobium… more
Date: January 1, 1989
Creator: Den Hartog, P. K.; Bogaty, J. M.; Bollinger, L. M.; Clifft, B. E.; Craig, S. L.; Harden, R. E. et al.
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Partner: UNT Libraries Government Documents Department
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Nonplanar machines

Description: This talk examines methods available to minimize, but never entirely eliminate, degradation of machine performance caused by terrain following. Breaking of planar machine symmetry for engineering convenience and/or monetary savings must be balanced against small performance degradation, and can only be decided on a case-by-case basis. 5 refs.
Date: May 1, 1989
Creator: Ritson, D. (Stanford Linear Accelerator Center, Menlo Park, CA (USA))
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Partner: UNT Libraries Government Documents Department
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Proposal for a study of laser acceleration of electrons using micrograting structures at ATF (Phase 1)

Description: We propose to investigate new methods of particle acceleration using a short-pulse CO{sub 2} laser as the power source and grating-like structures as accelerator cavities''. Phase I of this program is intended to demonstrate the principle of the method. We will focus the laser light to a 3 mm line on the surface of the microstructure. The structure is used to transform the electric field pattern of the incoming transversely polarized laser beam to a mode which has a component along the electron… more
Date: October 29, 1989
Creator: Chen, W.; Claus, J.; Fernow, R. C.; Fischer, J.; Gallardo, J. C.; Kirk, H. G. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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New results on (LAMPF II) superconducting linac cost

Description: A consolidated cost estimate for a superconducting 800 MeV extension of the LAMPF I linac is presented in this note. Based on recent CERN-LEP tender results for 20 superconducting cavities, the cost of a superconducting linac structure (402.5 MHz) can be projected with much better accuracy than so far. The total construction cost for an 800 MeV extension amounts to 99.5 M$, buildings, cryoplant etc. included. The corresponding figure for a normal conducting structure (1207.5 MHz, on axis couple… more
Date: January 1, 1989
Creator: Schaffer, G.
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Partner: UNT Libraries Government Documents Department
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