[en] This work describes the present situation of Pelletron-Linac Project and the steps that we accomplished last year. (author)

[en] A copy of PhD thesis by Dr. Seung Lee, supported by this grant and submitted during this contract period - ''Nonlinear Plasma Wakefield Acceleration: Models and Experiments''

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[en] In the last two decades a variety of novel concepts of electrons acceleration have been suggested and investigated. According to the interaction mechanism, these can be classified into three main groups: inverse radiation processes, space-charge wakes and electromagnetic wakes. In the first case, electrons are injected in structures that in 'normal' situations would generate radiation. Electromagnetic radiation is actually injected into the system and it accelerates a bunch of electrons. In the second case, a space-charge wake is generated in plasma by an intense laser pulse or short bunch of electrons. This space-charge wake may also accelerate a bunch of electrons. In the third case, an intense electron beam (bunch) generates radiation in a structure. This radiation is guided into an acceleration structure. Based on this classification, we shall review the basic concepts behind the first and the third group

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[en] In the latter part of this year an exhibit treating the historical development of high energy particle accelerators and detectors will open in Washington, DC, at the National Museum of History and Technology of the Smithsonian Institution. Filling 8000 square feet with historical hardware, the exhibit, which will continue for several years, is the product of a collaboration between ERDA and the Smithsonian, with essential contributions from several ERDA-funded accelerator laboratories. A discussion is given of the exhibit's displays and floorplan

[en] The first ICFA Mini-workshop on Dielectric Laser Accelerators was held on September 15-16, 2011 at SLAC National Accelerator Laboratory. We present the results of the Workshop, and discuss the main conclusions of the Accelerator Applications, Photonics, and Laser Technologies working groups. Over 50 participants from 4 countries participated, discussing the state of the art in photonic structures, laser science, and nanofabrication as it pertains to laser-driven particle acceleration in dielectric structures. Applications of this new and promising acceleration concept to discovery science and industrial, medical, and basic energy sciences were explored. The DLA community is presently focused on making demonstrations of high gradient acceleration and a compatible attosecond injector source - two critical steps towards realizing the potential of this technology.

[en] Dielectric wakefield accelerators have shown great promise toward high-gradient acceleration. We investigate the performances of a possible experiment under consideration at the FLASH facility in DESY to explore wakefield acceleration with an enhanced transformer ratio. The experiment capitalizes on a unique pulse shaping capability recently demonstrated at this facility. In addition, the facility incorporates a superconducting linear accelerator that could generate bunch trains with closely spaced bunches thereby opening the exploration of potential dynamical effects in dielectric wakefield accelerators.

[en] Wakefield acceleration in dielectric loaded structures is discussed in this paper. We present a description of the dielectric wakefield accelerator concept, comparing some features of the collinear and the two beam accelerator configurations. The Argonne Wakefield Accelerator Facility (AWA) is discussed in detail, including major upgrades that are presently taking place. The basic features and capabilities of the facility are presented, and the dielectric wakefield acceleration results are briefly summarized. Possible variants of the two beam accelerator configuration are discussed, and work on planar dielectric structures in various institutions is presented. We conclude this report mentioning prospective achievements of dielectric wakefield accelerating structures