Paper | Title | Page |
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TUPME073 | A Novel Laser Ionized Rb Plasma Source for Plasma Wakefield Accelerators | 1522 |
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Funding: AWAKE collaboration A proton driven plasma wakefield accelerator* is to be conducted at CERN by the AWAKE collaboration. Externally injected electrons are accelerated in a large gradient (~GeV/m) wakefield. The large gradient is achieved by resonant formation of the wakefield by a train of micro-bunches. Transverse modulation of a long (~12 cm) proton bunch by the self modulation instability** creates these plasma wavelength size (~1 mm) micro-bunches. This resonant mechanism brings a strict requirement on the plasma density uniformity, namely % 0.2, in order for the injected electron bunch to remain in the accelerating and focusing phase of the wakefields. We describe the plasma source*** that satisfies this requirement during the beam plasma interaction. Rb vapor with ~1015 cm-3 density is confined in a 10 m long 4 cm diameter, stainless-steel tube which is heated to ~200 Co by an oil heat exchanger. The access to the source during interaction is provided by custom built fast valves. The vapor is fully tunnel ionized (first e-) by a laser forming a 2 mm diameter plasma channel. * http://awake.web.cern.ch/awake/ ** http://link.aps.org/doi/10.1103/PhysRevLett.104.255003 *** http://dx.doi.org/10.1016/j.nima.2013.10.093 |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME073 | |
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