4,292 research outputs found
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Performance report of the U.S. Department of Energy's Jefferson Lab
No full textJefferson Lab, the newest of the US Department of Energy's 16 national laboratories, has been functioning effectively since its inception in 1984, first during construction and later during operations. As shown in this report, JLab aligns itself directly with DOE's strategic planning, both in terms of laboratory visions and plans and in terms of actual laboratory performance. Most importantly, JLab contributes significantly to DOE's Science and Technology mission in the area of nuclear physics, under the Office of Science. The laboratory practices continuous improvement and has made a number of important effectiveness and efficiency enhancements in recent years. Laboratory performance has been demonstrated by completion of the construction phase on cost and schedule, by exceeding technical specifications when coming on-line for physics research, and then - during operations in the mid- and late- 1990's - by the application of the performance measures in the laboratory's performance-based contract with DOE
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Overview of the Jefferson Lab IR FEL Program
No full textJefferson Lab (formerly known as CEBAF) is building a kilowatt-level free-electron laser operating in the mid-infrared to study technologies required for high average power operation. The design of the driver accelerator, its subsystems, and the wiggler and optical cavity will be described. We also present estimates of the output power, electron beam quality, and beam stability during energy recovery. Finally, the status of the project will be reviewed
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The Jefferson Lab 1 KW IR FEL
No full textThe Jefferson Lab (JLab) IR Demo Free Electron Laser (FEL) has completed commissioning and is initiating user service. The FEL - a high repetition rate, low extraction efficiency wiggler-driven optical cavity resonator - produces over 1 kW of tuneable light on intervals in a 3-6 lim wavelength range. It is driven by a 35-48 MeV, 5 mA superconducting RF (SRF) based energy-recovering continuous wave (CW) electron linac. The driver accelerator meets requirements imposed by low energy, high current, and a demand for stringent beam control at the wiggler and during energy recovery. These constraints are driven by the need for six-dimensional phase space management, the existence of deleterious collective phenomena (space charge, wake-fields, beam break-up, and coherent synchrotron radiation), and interactions between the FEL and the accelerator RF. The authors detail the system design, relate commissioning highlights, and discuss present performance
Jefferson Lab: Science Education
No full textThis is the homepage of the Office of Science Education of the Thomas Jefferson National Accelerator Facility (Jefferson Lab). The aim of the site is to aid Jefferson Lab's long-term commitment to science education by increasing the number of teachers with a substantial background in math and science, strengthening the motivation and preparation of all students, especially minorities and females, and addressing the serious under-representation of minorities and females in science, math, engineering and technology careers. The page offers links to teacher resources, a student zone, games and puzzles, and programs and events. The site focuses on physical science, but some sections are useful to students and teachers of the earth system sciences. Educational levels: Intermediate elementary, Middle school, High school
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Fiscal Year 2004
No full textJefferson Lab contributes to the Department of Energy mission to develop and operate major cutting-edge scientific user facilities. Jefferson Lab's CEBAF (Continuous Electron Beam Accelerator Facility) is a unique tool for exploring the transition between the regime where strongly interacting (nuclear) matter can be understood as bound states of protons and neutrons, and the regime where the underlying fundamental quark-and-gluon structure of matter is evident. The nature of this transition is at the frontier of the authors understanding of matter. Experiments proposed by 834 scientists from 146 institutions in 21 countries await beam time in the three halls. The authors user-customers have been delighted with the quality of the data they are obtaining. Driven by their expressed need for energies higher than the 4 GeV design energy and on the outstanding performance of their novel superconducting accelerator, the laboratory currently delivers beams at 5.5 GeV and expects to deliver energies approaching 6 GeV for experiments in the near future. Building on the success of Jefferson Lab and continuing to deliver value for the nation's investment is the focus of Jefferson Lab's near-term plans. The highest priority for the facility is to execute its approved experimental program to elucidate the quark structure of matter. The Lab plans to participate in the Strategic Simulation Initiative and benefit from the scientific opportunities that it affords. Initially, the lab will contribute its expertise in simulations for nuclear theory and accelerators, data handling, and distributed systems. As part of its SSI activities, the lab is planning to enhance its expertise in lattice QCD and simulations of photon-driven materials and chemical processes
Jefferson Journal Award
No full textThe Jefferson Journal Award has been established to honor the best paper submitted during each calendar year to the Jefferson Joumal of Psychiatry:A Resident Publication. An award of one thousand dollars is given to the chosen author, with an additional one thousand dollars to be given to the residency program or fellowship in which the author is enrolled. The winning submission is selected by the Journal\u27s editorial board from manuscripts submitted on any subject related to psychiatric practice or research
Recent results from Jefferson Lab
No full textRecent results on studies of the structure of nucleons and nuclei in the regime of strong interaction QCD are discussed. Use of high current polarized electron beams, polarized targets, and recoil polarimeters, in conjunction with modern spectrometers and detector instrumentation allow much more detailed studies of nucleon and nuclear structure than has been possible in the past. The CEBAF accelerator at Jefferson Lab was build to study the internal structure of hadrons in a regime where confinement is important and strong interaction QCD is the relevant theory. They author discusses how the first experiments already make significant contributions towards an improved understanding of hadronic structure
Jefferson Journal Award
No full textThe Jefferson Journal Award has been established to honor the best paper submitted during each calendar year to the Jefferson Journal of Psychiatry: A Resident Publication. An award of one thousand dollars is given to the chosen author, with an additional one thousand dollars to be given to the residency program or fellowship in which the author is enrolled. The winning submission is selected by the Journal\u27s editorial board from manuscripts submitted on any subject related to psychiatric practice or research.
The editorial board of the Journal is proud to announce the recipient of the 1993 Jefferson Journal Award: Scott A. West , M.D., for his article entitled Pharmacologic Advances In The Treatment of Schizophrenia. Dr. West is a Fellow in the Biological Psychiatry Program at the University of Cincinnati College of Medicine
LabArchives: An Electronic Research Notebook for Jefferson
No full textPaper lab notebooks have been essentially unchanged for centuries, but as data gathering is increasingly digital and problems of reproducibility and retracted publications emerge, more researchers are switching to electronic lab notebooks (ELN), also known as electronic research notebooks (ERN). While it has lab in its name, LabArchives is flexible enough for many uses across research disciplines. LabArchives is an ERN produced by Elsevier and provided by Jefferson at no additional charge to all its staff, students and faculty
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PLC Support Software at Jefferson Lab
No full textSeveral Automation Direct (DirectNet) Programmable Logic Controllers (PLCs) have been integrated into the accelerator control system at Jefferson Lab. The integration is based on new software that consists of three main parts: a PLC driver with a state machine control block, a device support module, and a common serial driver. The components of new software and experience gained with the use of this software for beam dump systems at Jefferson Lab are presented
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