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Pushing The Frontiers Of Superconducting Radio Frequency Science: From The Temperature Dependence Of The Superheating Field Of Niobium To Higher-Order Mode Damping In Very High Quality Factor Accelerating Structures

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Abstract

This thesis investigates the three frontiers of superconducting radio frequency (SRF) science: Gradient, Continuous wave beam power, and High quality factor structures. On the first front, the full temperature dependence of the superheating field - which sets the ultimate gradient limit for SRF cavities was measured for the first time for niobium. It was found that the Ginsburg-Landau result near T c is consistent with measurements within measurement uncertainty to even low temperatures. The beam power frontier was extended by designing a multicell cavity for the Cornell Energy Recovery Linac (ERL) with strongly damped higher-order modes. Simulations show that an ERL constructed of these cavities can support high beam current in excess of 300 mA, ∼30 times higher than in ERLs currently in operation. Finally, measurements of the prototype main linac cavity for the Cornell ERL demonstrate that the fundamental accelerating mode of the cavity in a fully equipped cryomodule can achieve quality factors in excess of 6 × 1010 at 1.8 K and 16.2 MV/m, a result more than tripling the design specification. This prototype structure also set a world record of Q0 = 1 × 1011 at 1.6 K, for a cavity installed in a fully equipped cryomodule, and introduces the possibility of a new class of extremely high efficiency SRF accelerators.

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2014-01-27

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Superheating; Energy Recovery Linac; Higher-order Modes

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Committee Chair

Liepe, Matthias Ulf

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Sethna, James Patarasp
Rubin, David L

Degree Discipline

Physics

Degree Name

Ph. D., Physics

Degree Level

Doctor of Philosophy

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Government Document

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dissertation or thesis

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