Bulletin of the American Physical Society
2020 Fall Meeting of the APS Prairie Section
Volume 65, Number 22
Friday–Sunday, November 13–15, 2020; Virtual
Session A03: Accelerator Physics |
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Chair: Yagmur Torun, Illinois Institute of Technology |
Friday, November 13, 2020 10:45AM - 11:15AM |
A03.00001: Understanding Beam Instabilities in the MW era Invited Speaker: Robert Ainsworth Successful delivery of intensity frontier science at Fermilab requires Mega-Watt (MW) class particle beams. For these beams to be delivered reliably and with minimal losses, it is essential that the particle bunches remain stable. The transverse mode coupling instability (TMCI) is known to be one of the main intensity limitations for bunch stability in circular machines. For many years, space charge (the repulsive forces between particles inside a bunch) was thought to have a stabilizing effect on TMCI raising the instability threshold to higher intensities. However, recent advances in the theoretical understanding of beam stability in the presence of strong space charge, has suggested a new class of instabilities known as convective instabilities. To tackle this problem, a new research program characterizing instabilities which makes use of Fermilab's existing accelerator complex will discussed. [Preview Abstract] |
Friday, November 13, 2020 11:15AM - 11:45AM |
A03.00002: Metamaterial Structures for High-Gradient Wakefield Acceleration Invited Speaker: Xueying Lu This talk will present the recent advances in novel metamaterial (MTM) structures for structure-based wakefield acceleration (SWFA). SWFA is a promising approach to make compact high-energy particle colliders by achieving high accelerating gradient. The MTM structure designed for SWFA is a “wagon wheel” periodic structure with a negative group velocity, and it can interact strongly with relativistic electron bunches by reversed-Cherenkov radiation. The period of the structure is much smaller than the wavelength. In this way, the MTM structure performs almost as a continuous medium. Two “wagon wheel” MTM structures have been tested at the Argonne Wakefield Accelerator (AWA). The reversed-Cherenkov radiation was verified experimentally. The highest power generated was 380 MW in a 10 ns long pulse at 11.7 GHz from a train of eight electron bunches with an energy of 65 MeV and a total charge of 224 nC. These results demonstrate the unique features of MTM structures that are attractive for future wakefield accelerators. Advantages include the high shunt impedance, the simple and rugged structure, and a large parameter space for optimization.\\ \\ In Collaboration With: Julian Picard, Michael Shapiro, Ivan Mastovsky, Richard Temkin; Massachusetts Institute of Technology. Manoel Conde, John Power, Jiahang Shao, Eric Wisniewsk, Maomao Peng, Gwanghui Ha, Jimin Seok, Scott Doran; Argonne National Laboratory. Chunguang Jing, Euclid Techlabs LLC [Preview Abstract] |
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