WorldCat Identities

Thomas Jefferson National Accelerator Facility (U.S.)

Overview
Works: 5,646 works in 5,968 publications in 1 language and 20,895 library holdings
Genres: Conference papers and proceedings  Periodicals 
Roles: Researcher, 981
Classifications: QC793.5.B32, 539
Publication Timeline
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Most widely held works about Thomas Jefferson National Accelerator Facility (U.S.)
 
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Most widely held works by Thomas Jefferson National Accelerator Facility (U.S.)
OnTarget( )

in English and held by 205 WorldCat member libraries worldwide

N* physics and nonperturbative quantum chromodynamics : proceedings of the joint ECT*/JLAB workshop, Trento, Italy, May 18-29, 1998 by S Simula( Book )

2 editions published in 1999 in English and held by 90 WorldCat member libraries worldwide

The workshop was devoted to a summary of recent experimental and theoretical research on N* physics. Special emphasis was given to the information that photo- and electro-production of nucleon resonances can provide on the non-perturbative regime of quantum chromodynamics. Discussions among experimentalists and theoreticians were stimulated in order to pursue the interpretation of the huge amount of forthcoming data from several laboratories in the world. This volume contains both the invited lectures and the contributions. On the main topics, like single and double pion production, pi- and K-meson production, the GDH sum rule, and the spin of the proton
Strong interactions at low and intermediate energies : proceedings of the 13th Annual HUGS at CEBAF, Jefferson Laboratory, USA, 26 May-12 June 1998 by Proceeding of the Annual HUGS at CEBAF( Book )

2 editions published in 2000 in English and held by 56 WorldCat member libraries worldwide

Single crystal-large grain niobium technology : International Niobium Workshop, Araxá, Brazil, 30 October-1 November 2006 by International Niobium Workshop( Book )

2 editions published in 2007 in English and held by 48 WorldCat member libraries worldwide

Exclusive and semi-exclusive processes at high momentum transfer : Newport News, VA, USA, May 19-22, 1999( Book )

2 editions published in 2000 in English and held by 48 WorldCat member libraries worldwide

Exclusive processes at high momentum transfer : May 15-18, 2002, Jefferson Lab, Newport News, Virginia by A. V Radyushkin( Book )

5 editions published in 2002 in English and held by 47 WorldCat member libraries worldwide

This book focuses on the physics of exclusive processes at high momentum transfer and their description in terms of generalized parton distributions, perturbative QCD, and relativistic quark models. It covers recent developments in the field, both theoretical and experimental
Achievements and new directions in subatomic physics : festschrift in honour of Tony Thomas' 60th birthday : Adelaide, Australia, 15-19 February 2010( Book )

1 edition published in 2010 in English and held by 36 WorldCat member libraries worldwide

"Readership: Researchers, academics and graduate students in nuclear physics and high-energy physics. The workshop reviewed recent results and new directions for nuclear and hadron physics, focusing on topics such as pion-nucleon interactions and chiral symmetry, partons and deep inelastic scattering, lattice QCD, physics beyond the Standard Model, and complex systems such as econophysics."--Résumé de l'éditeur
International Symposium on the Superconducting Science & Technology of Ingot Niobium : Jefferson Laboratory, Newport News, VA, USA, 22-24 September 2010 by International Symposium on the Superconducting Science & Technology of Ingot Niobium( Book )

2 editions published in 2011 in English and held by 32 WorldCat member libraries worldwide

Proceedings of the GW/JLab Workshop on N* Physics : the George Washington University--Virginia Campus, Ashburn, VA, U.S.A., October 30- November 1, 1997 by Workshop on N Physics( Book )

3 editions published between 1997 and 1998 in English and held by 12 WorldCat member libraries worldwide

Hadron structure with light dynamical quarks( )

3 editions published in 2005 in English and held by 6 WorldCat member libraries worldwide

Generalized parton distributions encompass a wealth of information concerning the three dimensional quark and gluon structure of the nucleon, and thus provide an ideal focus for the study of hadron structure using lattice QCD. The special limits corresponding to form factors and parton distributions are well explored experimentally, providing clear tests of lattice calculations, and the lack of experimental data for more general cases provides opportunities for genuine predictions and for guiding experiment. We present results from hybrid calculations with improved staggered (Asqtad) sea quarks and domain wall valence quarks at pion masses down to 350 MeV
International Workshop on Positrons at Jefferson Lab, Newport News, Virginia, 25-27 March 2009 by International Workshop on Positrons at Jefferson Lab( Book )

2 editions published in 2009 in Undetermined and English and held by 2 WorldCat member libraries worldwide

Fabrication and Testing of the SRF Cavities for the CEBAF 12 GeV Upgrade Prototype Cryomodule Renascence( )

2 editions published in 2005 in English and held by 0 WorldCat member libraries worldwide

Twelve seven-cell niobium cavities for the CEBAF 12 GeV upgrade prototype cryomodule Renascence have been fabricated at JLab and tested individually. This set includes four of the ''Low Loss'' (LL) design and eight of the ''High Gradient'' (HG) design. The fabrication strategy was an efficient mix of batch job-shop component machining and in-house EBW, chemistry, and final-step machining to meet mechanical tolerances. Process highlights will be presented. The cavities have been tested at 2.07 K, the intended CEBAF operating temperature. Performance exceeded the tentative design requirement of 19.2 MV/m cw with less than 29 W dynamic heat dissipation. These results, as well as the HOM damping performance will be presented
Ultrafast X-ray Sources( )

1 edition published in 2010 in English and held by 0 WorldCat member libraries worldwide

Since before the scattering of X-rays off of DNA led to the first understanding of the double helix structure, sources of X-rays have been an essential tool for scientists examining the structure and interactions of matter. The resolution of a microscope is proportional to the wavelength of light so x-rays can see much finer structures than visible light, down to single atoms. In addition, the energy of X-rays is resonant with the core atomic levels of atoms so with appropriate wavelengths the placement of specific atoms in a large molecule can be determined. Over 10,000 scientists use synchrotron sources, storage rings of high energy electrons, each year worldwide. As an example of such use, virtually every picture of a protein or drug molecule that one sees in the scientific press is a reconstruction based on X-ray scattering of synchrotron light from the crystallized form of that molecule. Unfortunately those pictures are static and proteins work through configuration (shape) changes in response to energy transfer. To understand how biological systems work requires following the energy flow to these molecules and tracking how shape changes drive their interaction with other molecules. We'd like to be able to freeze the action of these molecules at various steps along the way with an X-ray strobe light. How fast does it have to be? To actually get a picture of a molecule in a fixed configuration requires X-ray pulses as short as 30 femtoseconds (1/30 of a millionth of a millionth of a second). To capture the energy flow through changes in electronic levels requires a faster strobe, less than 1 femtosecond! And to acquire such information in smaller samples with higher accuracy demands brighter and brighter X-rays. Unfortunately modern synchrotrons (dubbed 3rd Generation Light Sources) cannot deliver such short bright pulses of X-rays. An entirely new approach is required, linear-accelerator (linac- )-based light sources termed 4th or Next Generation Light Sources (NGLSs). Although NGLSs will not displace synchrotrons from their role they do offer exciting new capabilities which can be understood from the physics of the light production in each device
Effect of Atomic Hydrogen Exposure on Electron Beam Polarization from Strained GaAs photocathodes( )

3 editions published in 2003 in English and held by 0 WorldCat member libraries worldwide

Strained-layer GaAs photocathodes are used at Jefferson Lab to obtain highly polarized electrons. Exposure to atomic hydrogen (or deuterium) is used to clean the wafer surface before the activation with cesium and nitrogen trifluoride to consistently produce high quantum yield photocathodes. The hydrogen-cleaning method is easy, reliable and inexpensive. However, recent tests indicate that exposure to atomic hydrogen may affect the polarization of the electron beam. This paper presents preliminary results of a series of tests conducted to study the effect of atomic H exposure on the polarized electron beam from a strained-layer GaAs sample. The experimental setup is described and the first measurements of the beam polarization as a function of exposure dose to atomic hydrogen are presented
Variation of Mechanical Properties of High RRR And Reactor Grade Niobium With Heat Treatments( )

2 editions published in 2003 in English and held by 0 WorldCat member libraries worldwide

Superconducting rf cavities used as accelerating structures in particle accelerators are made from high purity niobium with residual resistance ratios greater than 250. Reactor grade niobium is also used to make wave-guide and/or end group components for these accelerating structures. The major impurities in this type of niobium are interstitially dissolved gases such as hydrogen, nitrogen, and oxygen in addition to carbon. After fabricating the niobium accelerating structures, they are subjected to heat treatments for several hours in vacuum at temperatures of up to 900 C for degassing hydrogen or up to 1400 C for improving the thermal conductivity of niobium considerably. These heat treatments are affecting the mechanical properties of niobium drastically. In this paper the variation of the mechanical properties of high purity and reactor grade niobium with heat treatments in a vacuum of (almost equal to) 10⁻⁶ Torr and temperatures from 600 C to 1250 C for periods of 10 to 6 hours are presented. High purity niobium starts exhibiting upper and lower yield stress points while reactor grade niobium, on the other hand, stops exhibiting this characteristic BCC material behavior of upper and lower yield stress points after heat treatment at 1250 C in the presence of Ti as a solid state getter material
Effective Field Theory and Isospin Violation in Few-Nucleon Systems( )

2 editions published in 2004 in English and held by 0 WorldCat member libraries worldwide

I discuss the leading and subleading isospin--breaking three--nucleon forces in the chiral effective field theory framework. I have discussed the leading and subleading isospin-violating 3NFs. The leading contributions are generated by one- and two-pion exchange diagrams with their strength given by the strong neutron-proton mass difference. The subleading corrections are again given by one- and two-pion exchange diagrams, driven largely by the charged-to-neutral pion mass difference and also by the electromagnetic neutron-proton mass difference and the dimension two electromagnetic LEC f₁. In the future, these isospin-breaking forces should be used to analyze few-nucleon systems based on chiral EFT
Development of a Niobium Bellow for Beamline Connections( )

2 editions published in 2003 in English and held by 0 WorldCat member libraries worldwide

Superconducting cavities in an accelerator assembly are usually connected at the beampipes by stainless steel bellows. The bellows operate at an intermediate temperature, compensating for alignment tolerances on the cavity beamlines and for thermal contraction during cooldown to cryogenic temperatures. This transition from one cavity to the next in a cavity string is typically of the order of 3/2 wavelength long with approximately half a wavelength taken up by the bellows. If one could incorporate a niobium bellows in the beam pipe, this distance could be reduced by half a wave length. In the case of a big accelerator such as TESLA the overall cavity length for the accelerator could be reduced by roughly 10% or 2000 m. In terms of cost savings this would amount to several million dollars. Motivated by this we have begun to develop a niobium bellows to be used on a 2.75 inch diameter beamline. It is made from 0.3 mm thick niobium sheet, rolled into a tube and secured by a longitudinal full penetration electron beam weld. The weld is made at high speed with a narrow, focused beam reducing the heat affected zone, thus limiting the grain growth, which could affect the formability. Subsequently, two convolutions are pressed into this tube in a 2-stage process, using an external die and a polyurethane internal expander. Niobium cuffs and flanges are electron beam welded to the formed bellows, which facilitates leak testing and allows some measurements of compression/expansion and bending. In this contribution the fabrication process and the subsequent mechanical and vacuum tests with the bellows will be described
Generalized Parton Distributions and Depp Exclusive Reactions : Present Program at Jlab( )

3 editions published between 2004 and 2008 in English and held by 0 WorldCat member libraries worldwide

We review briefly the physical concept of generalized parton distributions and the experimental challenges associated with the corresponding measurements of deep exclusive reactions. The first data obtained at Jefferson Lab for exclusive photon (DVCS) and vector meson (DVMP) electroproduction above the resonance-excitation region are described. Two upcoming dedicated DVCS experiments are presented in some detail
3He(e, e'p)d and 3He(e, e'p)pn at High Momentum Transfer( )

4 editions published between 2003 and 2004 in English and held by 0 WorldCat member libraries worldwide

The (e, e'p) reaction has proven to be a useful tool for studying specific aspects of the nucleus. The Jefferson Lab continuous electron beam accelerator facility (CEBAF) along with the high resolution spectrometers in the Hall A end station allow this reaction to be studied in kinematics heretofore unaccessible. In this paper the results of the Jefferson Lab Hall H" 3He(e, e'p)d and 3He(e, e'p)pn measurements, performed at a fixed q=1.5GeV/c and omega=840MeV, will be presented along with theoretical calculations by G. Salme, J.-M. Laget, and J. Udias
 
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Audience level: 0.59 (from 0.32 for Ultrafast ... to 0.87 for Hadron str ...)

N* physics and nonperturbative quantum chromodynamics : proceedings of the joint ECT*/JLAB workshop, Trento, Italy, May 18-29, 1998
Alternative Names

controlled identityContinuous Electron Beam Accelerator Facility

CEBAF

Jefferson Lab

Jefferson Lab Newport News, Va

Jefferson Lab (U.S.)

Jefferson Laboratory

Jefferson Laboratory Newport News, Va

Jefferson Laboratory (U.S.)

Jefferson National Accelerator Facility

Jefferson National Accelerator Facility Newport News, Va

Jefferson National Accelerator Facility (U.S.)

JLab

JLAB (Thomas Jefferson National Accelerator Facility : U.S.)

Thomas Jefferson National Accelerator Facility

TJNAF

United States Thomas Jefferson National Accelerator Facility

Лаборатория Джефферсона

تاسیسات شتابدهنده ملی توماس جفرسون

जेफर्सन लैब

トーマス・ジェファーソン国立加速器施設

傑佛遜實驗室

托馬斯傑斐遜國家加速器裝置

Languages
English (82)

Covers
Strong interactions at low and intermediate energies : proceedings of the 13th Annual HUGS at CEBAF, Jefferson Laboratory, USA, 26 May-12 June 1998Single crystal-large grain niobium technology : International Niobium Workshop, Araxá, Brazil, 30 October-1 November 2006Exclusive and semi-exclusive processes at high momentum transfer : Newport News, VA, USA, May 19-22, 1999Exclusive processes at high momentum transfer : May 15-18, 2002, Jefferson Lab, Newport News, VirginiaAchievements and new directions in subatomic physics : festschrift in honour of Tony Thomas' 60th birthday : Adelaide, Australia, 15-19 February 2010International Workshop on Positrons at Jefferson Lab, Newport News, Virginia, 25-27 March 2009