Open AccessA High-Efficiency Resonant Cavity for Measurement of a Beam Quadrupole Moment
Author(s) -
N. Barov,
Jina Kim,
C. Nantista,
R.H. Miller
Publication year - 2005
Language(s) - English
Resource type - Reports
DOI - 10.2172/878032
Subject(s) - quadrupole , capacitive sensing , electrical impedance , optics , resonant cavity , physics , materials science , beam (structure) , particle accelerator , radius , optoelectronics , electrical engineering , engineering , atomic physics , laser , computer science , computer security
Many particle accelerator applications can benefit from online pulse-by-pulse nonintercepting emittance measurement system. Recently, there has been much interest in performing such a measurement with a set of resonant quadrupole-mode cavities. This article explores a geometry to achieve an enhanced shunt impedance in such a cavity by adding a set of posts forming capacitive gaps near the beam pipe outer radius. For typical diagnostic cavity applications, a five-fold increase in shunt impedance can be obtained with this method. The effect of errors in cavity fabrication on the required mode structure are explored
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