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Fermi National Accelerator Laboratory
No full textFermi National Accelerator Laboratory advances the understanding of the fundamental nature of matter and energy by providing leadership and resources for qualified researchers to conduct basic research at the frontiers of high energy physics and related disciplines. Fermilab's mission is to advance the understanding of the fundamental nature of matter and energy. Fermilab's world-class scientific research facility allows qualified researchers from around the world to conduct fundamental research at the frontiers of high-energy physics and related disciplines
News Release
Get PDFDr. Leon M. Lederman, Director of Fermi National Accelerator Laboratory (Fermilab) in Batavia, Illinois, has been named one of three recipients of the 1988 Nobel Prize for physics. Sharing the prize with Dr. Lederman are Dr. Melvin Schwartz and Dr. Jack Steinberger. The three have been cited for their discovery, in 1962, of a second neutrino, an elementary subatomic particle. Fermilab is operated by the Universities Research Association, Inc., under contract with the United States Department of Energy (DOE)
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An improved 8 GeV beam transport system for the Fermi National Accelerator Laboratory
No full textA new 8 GeV beam transport system between the Booster and Main Ring synchrotrons at the Fermi National Accelerator Laboratory is presented. The system was developed in an effort to improve the transverse phase space area occupied by the proton beam upon injection into the Main Ring accelerator. Problems with the original system are described and general methods of beamline design are formulated. Errors in the transverse properties of a beamline at the injection point of the second synchrotron and their effects on the region in transverse phase space occupied by a beam of particles are discussed. Results from the commissioning phase of the project are presented as well as measurements of the degree of phase space dilution generated by the transfer of 8 GeV protons from the Booster synchrotron to the Main Ring synchrotron
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Fermilab SRF cryomodule operational experience
Get PDFFermi National Accelerator Laboratory is constructing an Advanced Accelerator Research and Development facility at New Muon Lab. The cryogenic infrastructure in support of the initial phase of the facility consists of two Tevatron style standalone refrigerators, cryogenic distribution system as well as an ambient temperature pumping system to achieve 2K operations with supporting purification systems. During this phase of the project a single Type III plus 1.3 GHz cryomodule was installed, cooled and tested. Design constraints of the cryomodule required that the cryomodule individual circuits be cooled at predetermined rates. These constraints required special design solutions to achieve. This paper describes the initial cooldown and operational experience of a 1.3 GHz cryomodule using the New Muon Lab cryogenic system
Record-breaking luminosity boosts discovery potential at Fermilab's Tevatron collider
No full textThe record-breaking performance of the Tevatron colklider at the Department of Energy's Fermi National Accelerator Laboratory is pushing tje search fpr dark matter, supersymmetric particles and extra dimensions to new limits. Repeatedly smashing peak luminosity records, the Tevatron has created record numbers of proton-antiproton collisions that provide the means to unveil the secrets of the univers
A report on the design of the Fermi National Accelerator Laboratory superconducting accelerator
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Initial Estimate of Transmission Line Effects in SSC Design D Magnets
Get PDFThe response of the SSC accelerator magnet string to transient excitation from the power supply is considered. Some criteria for the selection of the optimum damping resistors for the SSC magnets are discussed. Once the damping resistors are chosen, the transient response of the load to power supply transients, including the effect of the power supply filter is analyzed. A comparative analysis is made of the differences between two possible configurations in the distribution of the magnets (with and without a return bus)
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Energy Saver A-Sector Power Test Results
Get PDFThe superconducting magnets and associated cryogenic components in A-sector represent the initial phase of installation of the Fermilab superconducting accelerator, designed to accelerate proton beams to energies of 1 TeV. Installation of the magnets, comprising one-eighth of the ring, was completed in December, 1981. Cooldown and power tests took place in the first half of 1982, concurrent with main ring use for 400 GeV high energy physics. The tests described in this paper involved 151 cryogenic components in the tunnel: 94 dipoles, 24 quadrupoles, 25 spool pieces, 3 feed cans, 4 turn-around boxes and 1 bypass. Refrigeration was supplied by three satellite refrigerators, the Central Helium Liquefier, and two compressor buildings. The magnets were powered by a single power supply
Magnet Current Regulation in the SSC
Get PDFThis paper investigates the transient response, the stability and the regulation characteristics of a system designed to power the SSC magnets. Considering the magnet system as a transmission line, the performance of the regulation system was investigated under perturbations on the voltage power supply and changes in the current reference. The influence of the damping resistors on the transient reponse was included. Differential current transductors were included to minimize the tracking errors between the electrically isolated sectors. A comparison was made for the two cases, with and without the differential loops. System performance was investigated during ramping of the magnets and during steady state full field operation
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The Performance Analysis of Linux Networking - Packet Receiving
Get PDFThe computing models for High-Energy Physics experiments are becoming ever more globally distributed and grid-based, both for technical reasons (e.g., to place computational and data resources near each other and the demand) and for strategic reasons (e.g., to leverage equipment investments). To support such computing models, the network and end systems, computing and storage, face unprecedented challenges. One of the biggest challenges is to transfer scientific data sets--now in the multi-petabyte (10{sup 15} bytes) range and expected to grow to exabytes within a decade--reliably and efficiently among facilities and computation centers scattered around the world. Both the network and end systems should be able to provide the capabilities to support high bandwidth, sustained, end-to-end data transmission. Recent trends in technology are showing that although the raw transmission speeds used in networks are increasing rapidly, the rate of advancement of microprocessor technology has slowed down. Therefore, network protocol-processing overheads have risen sharply in comparison with the time spent in packet transmission, resulting in degraded throughput for networked applications. More and more, it is the network end system, instead of the network, that is responsible for degraded performance of network applications. In this paper, the Linux system's packet receive process is studied from NIC to application. We develop a mathematical model to characterize the Linux packet receiving process. Key factors that affect Linux systems network performance are analyzed
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