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AAC'04 Agenda
AAC'04 Poster
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No Working Group specified - Invited Oral in Working Group
Malka Victor: Recent results on high energy and high quality electron beams from relativistic laser-plasma interaction with ultra short laser pulse.
  We report on recent results of electron acceleration by ultrashort, high repetition rate laser systems. High energy and very high quality electron beams have been measured in a very specific parameter regime. The most remarkable characteristic of these beams is their high spatial quality: the beam is nearly a perfect Gaussian very collimated with a divergence less than 10 mrad. In this regime, the electron beam pointing, as well as its stability, (a critical issue for applications) is also very good. Electron energies extend to beyond 200 MeV limited by our detection device. The full energy distributions measured in a single shot show very interested non monotonic feature. Typical charges in a 10 % energy bandwidth of 100, 50 and 10 pC have been measured respectively at 20, 50 and 100 MeV. These high performances were only achieved when a fully compressed (30-40 fs), 1.3 J laser pulse was interacting with a plasma with electron density between 0.7×1018 cm?3 and 2.5×1019 cm-3. The role of laser plasma approach concerning high energy physics will be discussed on the basis of the presented results.
Santiago Bernal: The University of Maryland Electron Ring: a model recirculator for intense-beam physics research
  The University of Maryland Electron Ring (UMER), designed for transport studies of space-charge dominated beams in a strong focusing lattice, is nearing completion. Low energy, high intensity electron beams provide an excellent model system for experimental studies with relevance to all areas that require high quality, intense charged-particle beams. In addition, UMER constitutes an important tool for benchmarking of computer codes. When completed, the UMER lattice will consist of 36 alternating-focusing (FODO) periods over an 11.5-m circumference. Current studies in UMER over about 2/3 of the ring include beam-envelope matching, halo formation, unsymmetrical focusing, and longitudinal dynamics (beam bunch erosion and wave propagation.) Near future, multi-turn operation of the ring will allow us to address important additional issues such as resonance-traversal, energy spread and others. The main diagnostics are phosphor screens and capacitive beam position monitors placed at the center of each 20-degree bending section. In addition, pepper-pot and slit-wire emittance meters are in operation. The range of beam currents used correspond to space charge tune depressions from 0.2 to 0.8, which is unprecedented for a circular machine.
Evgenya Smirnova: Photonic Band Gap structures for accelerator applications
  A photonic band gap (PBG) structure is a one-, two- or three-dimensionalperiodic metallic and/or dielectric system (for example, of rods), whichacts like a filter, reflecting rf fields in some frequency range andallowing rf fields at other frequencies to transmit through. PBG structureshave many promising applications in active and passive devices at millimeterwave and higher frequencies. Metal PBG structures can be employed at X andKu-band accelerators to suppress wakefields whenever dielectric PBGstructures are attractive at higher frequency for construction of low-losslaser-driven accelerators. For both applications two-dimensional (2D) PBGstructures are of main interest. In this talk I present a review oftheoretical studies and computer modeling of 2D metal and dielectricstructures. Also world-wide experimental efforts on constructing and testingmetal and dielectric PBG accelerators and microwave devices are discussed.