JEFFERSON LAB SEARCH

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  • The Quark-Meson Coupling (QMC) model, a theory which takes the radical step of incorporating self-consistent changes in the quark structure of a nucleon when it is bound in matter, has been transformed into a theory of quasi-nucleons interacting through many-body forces. This adjustment allows the QMC model to be related to the time-honored descriptions of the nucleus where nucleon structure was supposed to play no role. Of course, in experiments conducted at very high energies, it is customary to see the nucleus as a collection of quarks interacting via the exchange of gluons.

  • The strength of the strong force is set by the value of its coupling αs. At small distances, much smaller than a fermi (1 fermi = 10-15m, about the size of a proton), αs is small and the strong force can be studied with the standard methods of perturbation theory. This discovery by David J. Gross, H. David Politzer and Frank Wilczek was acknowledged by the 2004 Nobel Prize in Physics.

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  • Silicon is perhaps one of the most important materials in our technological world, but its performance is always ultimately limited by impurities. Mitigation by impurity elimination is not possible, and theoretical understanding is very limited. Thus, these experiments, in which real-time dynamical evolution of excited impurity dynamics is measured, are of high fundamental as well as technological importance.

  • The Jefferson Lab Free-Electron Laser was used by Rox Anderson’s group from the Wellman Center at Massachussetts General Hospital, part of Harvard Medical School, for a series of experiments aimed at curing acne, a debilitating disease of over-active sebaceous glands. Currently the drug Accutane® (generically called isotretinion) is used to treat acne, but its side effects can be worse than the disease.

  • Well-behaved magnetic thin films of stoichiometric alloys, such as an alloy of nickel and iron (NiFe), are not easily formed. Anne Reilly and colleagues at Jefferson Lab and The College of William & Mary excited bulk NiFe with the Jefferson Lab FEL and found a strikingly different response than that found with a conventional titanium-sapphire laser.

  • The Fast Electronics Group supports and enables the experimental program with the design, development and implementation of ultra-fast fully pipelined electronic detector readout hardware systems. These systems include the use of state-of-the-art large-scale integrated circuits and high speed fiber optic communication hardware including high speed electronics for detector front end instrumentation.

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      Proposal Phase  

    • Submitting Proposals PAC & TAC
    • Director's Decision

     Preliminary Planning Phase

    • Exp. Description and Requirements
    • Exp. Readiness Review Calendar

    Design Phase

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