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[Memo from Rogers Redding, December 9, 1988]

Description: Memo from Rogers Redding, on December 9, 1988. An announcement that the University of Central Florida is hiring a new Dean of the College of Arts and Sciences, and a letter from James R. Miller recommending Redding for the position, are included. A handwritten note on the first page reads: "Jim - Many Thanks! - Rog".
Date: December 9, 1988
Creator: Redding, Rogers W.
Item Type: Refine your search to only Letter
Partner: Texas Academy of Mathematics and Science
open access

Preparing the Alcator C bolometer system for use on MTX (Microwave Tokamak Experiment)

Description: The Alcator C bolometer array has been modified to be compatible with electron cyclotron heating on the Microwave Tokamak Experiment. Fine wire mesh screens are mounted on the front of the bolometer collimator tubes to attenuate microwave heating of the bolometers. Structural changes eliminate openings in the seams of the bolometer housing, which represent pathways for microwaves to enter the system. This paper outlines the operational principles of the bolometer system, discusses the measured … more
Date: February 9, 1988
Creator: Marinak, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Compact X-Ray Free Electron Laser

Description: We present a design concept and simulation of the performance of a compact x-ray, free electron laser driven by ultra-high gradient rf-linacs. The accelerator design is based on recent advances in high gradient technology by a LLNL/SLAC/LBL collaboration and on the development of bright, high current electron sources by BNL and LANL. The GeV electron beams generated with such accelerators can be concerted to soft x-rays in the range from 2--10 nm by passage through short period, high fields str… more
Date: September 9, 1988
Creator: Barletta, W.; Attac, M.; Cline, D.B.; Kolonko, J.; Wang, X.; Bhowmik, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Improving the Fermilab Booster Emittance

Description: Demand of high luminosity in the Tevatron collider in Fermilab makes the small beam emittance coming out of the 8 GeV Booster a highly desirable feature. This is because Booster bunches with small emittance, when eventually coalesced into Main Ring bunches, will ensure a high luminosity in the collider. Efforts have been made to identify factors limiting the phase space density in both transverse and longitudinal dimensions. The experimental result points to space charge induced tune spread at … more
Date: June 9, 1988
Creator: Chao, Y.; Crisp, J.; Holmes, S.; Lackey, J. & Merz, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design considerations for ITER (International Thermonuclear Experimental Reactor) magnet systems

Description: The International Thermonuclear Experimental Reactor (ITER) is now completing a definition phase as a beginning of a three-year design effort. Preliminary parameters for the superconducting magnet system have been established to guide further and more detailed design work. Radiation tolerance of the superconductors and insulators has been of prime importance, since it sets requirements for the neutron-shield dimension and sensitively influences reactor size. The major levels of mechanical stres… more
Date: October 9, 1988
Creator: Henning, C. D. & Miller, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Vector-vector production in photon-photon interactions

Description: Measurements of exclusive untagged /rho//sup 0//rho//sup 0/, /rho//phi/, K/sup *//bar K//sup */, and /rho/..omega.. production and tagged /rho//sup 0//rho//sup 0/ production in photon-photon interactions by the TPC/Two-Gamma experiment are reviewed. Comparisons to the results of other experiments and to models of vector-vector production are made. Fits to the data following a four quark model prescription for vector meson pair production are also presented. 10 refs., 9 figs.
Date: December 9, 1988
Creator: Ronan, M.T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design considerations for ITER (International Thermonuclear Experimental Reactor) magnet systems: Revision 1

Description: The International Thermonuclear Experimental Reactor (ITER) is now completing a definition phase as a beginning of a three-year design effort. Preliminary parameters for the superconducting magnet system have been established to guide further and more detailed design work. Radiation tolerance of the superconductors and insulators has been of prime importance, since it sets requirements for the neutron-shield dimension and sensitively influences reactor size. The major levels of mechanical stres… more
Date: October 9, 1988
Creator: Henning, C. D. & Miller, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Coherent betatron instability in the Tevatron

Description: The coherent betatron instability was first observed during the recent 1987-88 Tevatron fixed target run. In this operating mode 1000 consecutive bunches are loaded into the machine at 150 GeV with a bunch spacing of 18.8 /times/ 10/sup -9/ sec (53 MHz). The normalized transverse emittance is typically 15 ..pi.. /times/ 10/sup -6/ m rad in each plane with a longitudinal emittance of about 1.5 eV-sec. The beam is accelerated to 800 GeV in 13 sec. and then it is resonantly extracted during a 23 s… more
Date: June 9, 1988
Creator: Bogacz, S. A.; Harrison, M. & Ng, K. Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Critical Flow Restricting Orifices

Description: The installation of flow restricting orifices in both the nitrogen gas and instrument air supply lines in the D-Zero Building limits the flow available to the various users. These orifices are strategically positioned along the lines such that no one user can monopolize the gas supply and deprive others of their flow required to operate. Provided that the necessary orifice plates are machined in a manner similar to that of the prototypes, the orifices for the various lines were sized using the … more
Date: August 9, 1988
Creator: Kurita, C. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analytical and numerical evaluation of Landau cavities in the Fermilab Booster

Description: Longitudinal coupled bunch instability has been observed in the Fermilab Booster at high intensity. It is a cause for concern due to its effect on the Tevatron collider performance. We study this phenomenon using initial value technique to correctly account for the underlying transient nature. Analytic result is obtained for any mode and comparison is made between ordinary harmonic potential and higher harmonic (Landau) cavity potential. A computer program is developed to facilitate the calcula… more
Date: June 9, 1988
Creator: Chao, Yu-Chiu & Ng, King-Yuen
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Trip Report: RAM-PAC International

Description: In the final design of the DO Detector, the three cryostats (CC and both EC's) will ride on a pair of hardened ways so as to move the EC's out and away from the CC cryostat to provide access between cryostats for repairs and such. Each of the cryostats sits on a carriage which has a pair of Tychoway rollers placed at each corner to roll on the hardened ways. When in position, the full weight of the cryostats is to be relieved from the rollers with the use of a pair of 90-ton jacks flanking the … more
Date: September 9, 1988
Creator: Jaques, Al
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Coupled Bunch Instability in Fermilab Booster: Longitudinal Phase-Space Simulation

Description: The physical presence of vacuum structures can be expressed in terms of a coupling impedance experienced by the beam. The beam environment considered here consist of parasitic higher order modes of the r.f. cavities. These resonances may have high enough Q's to allow consecutive bunches to interact through mutually induced fields. The cumulative effect of such fields as the particles pass through the cavity may be to induce a coherent buildup in synchrotron motion of the bunches, i.e., a longit… more
Date: June 9, 1988
Creator: Bogacz, S. A. & Stahl, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Fast Radiation-to-Coherent Light Converter

Description: We have developed a radiation-to-coherent light converter (RCLC) with a monolithically integrated semiconductor chip that consists of a chromium-doped GaAs photoconductor detector modulates the laser diode, which has been biased above the lasing threshold, thus converting a radiation pulse to an electric pulse and then to a light pulse. The laser pulse is then transmitted to a fast recorder through a high-bandwidth optical fiber. In the absence of a single-step x-ray pumped laser, our converter… more
Date: September 9, 1988
Creator: Wang, C. L.; Flatley, J. E.; Stewart, P. H.; Bar-Chaim, N.; Lau, K. Y.; Ury, I. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The development and characterization of neutron-damaged GaAs x-ray detectors

Description: Photoconductive x-ray detectors are becoming an important x-ray diagnostic as a result of their small size, fast response time, and high sensitivity. We are developing a discrete array of neutron- damaged GaAs detectors to be used in an imaging x-ray spectrometer, and we describe herein the techniques we use to fabricate and characterize them for an upcoming experiment. Using a 225-ps x-ray pulse from a laser-produced plasma, we measured the sensitivity and time response of the detectors to be … more
Date: September 9, 1988
Creator: Springer, P. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Proposed design of SAMUS (small angle muon spectrometer) toroid and its magnetic field calculation

Description: Presently the D/null/ detector has three big toroidal magnets; one Central Toroid (CF) and two End Wall Toroids (EF). The EF toroids have central openings 72'' x 72''. Originally, this opening was meant for possible future end-plug calorimeters. Instead we are now designing Small Angle Muon Spectrometer (SAMUS) for the opening. The major component will be built at Serpukhov. The design of the toroid magnets and its magnetic field calculations is being done by exchanging information between Serp… more
Date: June 9, 1988
Creator: Yamada, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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