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An accurate Rb density measurement method for a plasma wakefield accelerator experiment using a novel Rb reservoir
A method to accurately measure the density of Rb vapor is described. We plan
on using this method for the Advanced Wakefield (AWAKE)~\cite{bib:awake}
project at CERN , which will be the world's first proton driven plasma
wakefield experiment. The method is similar to the hook~\cite{bib:Hook} method
and has been described in great detail in the work by W. Tendell Hill et.
al.~\cite{bib:densitymeter}. In this method a cosine fit is applied to the
interferogram to obtain a relative accuracy on the order of for the vapor
density-length product. A single-mode, fiber-based, Mach-Zenhder interferometer
will be built and used near the ends of the 10 meter-long AWAKE plasma source
to be able to make accurate relative density measurement between these two
locations. This can then be used to infer the vapor density gradient along the
AWAKE plasma source and also change it to the value desired for the plasma
wakefield experiment. Here we describe the plan in detail and show preliminary
results obtained using a prototype 8 cm long novel Rb vapor cell.Comment: 5 pages 9 figure
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