Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session T9: Advanced Accelerators |
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Sponsoring Units: DPP DPB Chair: Joseph Bisognano, University of Wisconsin-Madison Room: Hyatt Regency Jacksonville Riverfront City Terrace 5 |
Monday, April 16, 2007 1:30PM - 2:06PM |
T9.00001: Laser driven accelerating structures: from photonic bandgap to surface waves Invited Speaker: As the frontier of particle physics moves towards higher energies, there is a mounting pressure on the accelerator physics community to develop new accelerating concepts resulting in more compact accelerators. This requires higher accelerating gradients and, owing to the trapping criterion, higher radiation frequencies. In order for structure-based laser driven accelerators to become a reality, three major challenges must be addressed: (a) development of highly efficient laser sources, (b) overcoming laser damage by using advanced materials, and (c) efficient coupling of radiation to particle beams by the appropriate structure design. In this talk I will address the last two issues. Several structure designs such as photonic bandgap, surface wave, and Bragg waveguide accelerators will be reviewed and compared. Micro-fabrication techniques enabling such accelerators will be examined. First experimental demonstration of grating-assisted excitation of accelerating surface waves in a Surface Wave Accelerator Based on Silicon Carbide (SWABSiC) will be reported. [Preview Abstract] |
Monday, April 16, 2007 2:06PM - 2:42PM |
T9.00002: Recent Progress on Plasma-Based Accelerators Invited Speaker: The physics, research status, and challenges of plasma-based accelerators will be discussed. In 2004, three groups reported the production of high quality electron bunches from laser plasma accelerators in the 100 MeV range with narrow divergence and narrow energy spread [S.P.D. Mangles et al.; C.G.R. Geddes et al.; and J. Faure et al.; Nature, Sep 2004]. These results were obtained using multi-ten TW lasers interacting with few-mm diameter gas jet targets. High quality electron bunches were generated by exciting plasma wakefields to sufficient amplitudes so as to self-trap electrons from the background plasma and accelerate these electrons over distances near the dephasing length. Recent results include production of high quality electron beams at the 1 GeV level, obtained by extending the plasma channel length to a few cm by using a capillary discharge [W.P. Leemans et al., Nature Physics, Oct 2006], as well as controlled injection of electrons using colliding laser pulses to produce stable beams at the 100 MeV level [J. Faure, Nature, Dec 2006]. Also presented will be recent results on plasma wakefield accelerators using the 42 GeV electron beam at SLAC, in which the wakefield driven by the front of the bunch led to energy doubling of electrons in the back of the bunch [I. Bloomfield et al., Nature, 2007]. [Preview Abstract] |
Monday, April 16, 2007 2:42PM - 3:18PM |
T9.00003: Novel particle accelerators and their reach for science Invited Speaker: |
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