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Conference Paper

Schlieren Imaging for the Determination of the Radius of an Excited Rubidium Column

MPS-Authors

Bachmann,  Anna-Maria
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Martyanov,  M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Moody,  J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Pukhov,  A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Muggli,  P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

Bachmann, A.-M., Martyanov, M., Moody, J., Pukhov, A., & Muggli, P. (2018). Schlieren Imaging for the Determination of the Radius of an Excited Rubidium Column. Nuclear Instruments and Methods in Physics Research Section A, (909), 387.


Cite as: https://hdl.handle.net/21.11116/0000-0003-F849-4
Abstract
AWAKE develops a new plasma wakefield accelerator using the CERN SPS proton bunch as a driver. The proton bunch propagates through a 10 m long rubidium plasma, induced by an ionizing laser pulse. The co-propagation of the laser pulse with the proton bunch seeds the self modulation instability of the proton bunch that transforms the bunch to a train with hundreds of bunchlets which drive the wakefields. Therefore the plasma radius must exceed the proton bunch radius. Schlieren imaging is proposed to determine the plasma radius on both ends of the vapor source. We use Schlieren imaging to estimate the radius of a column of excited rubidium atoms. A tunable, narrow bandwidth laser is split into a beam for the excitation of the rubidium vapor and for the visualization using Schlieren imaging. With a laser wavelength very close to the D2 transition line of rubidium (780 nm), it is possible to excite a column of rubidium atoms in a small vapor source, to record a Schlieren signal of the excitation column and to estimate its radius. We describe the method and show the results of the measurement.