CERN Accelerating science

Published Articles
Report number	CERN-ACC-2019-231
Title	Generation and delivery of an ultraviolet laser beam for the RF-photoinjector of the AWAKE electron beam
Author(s)	Fedosseev, Valentin (CERN) ; Batsch, Fabian (CERN) ; Capelli, Candy (CERN) ; Chevallay, Eric (CERN) ; Chritin, Nicolas (CERN) ; Döbert, Steffen (CERN) ; Feniet, Thierry (CERN) ; Friebel, Florence (CERN) ; Gander, Pierre (CERN) ; Granados, Eduardo (CERN) ; Gschwendtner, Edda (CERN) ; Hansen, Jan (CERN) ; Heßler, Christoph (CERN) ; Hüther, Mathias (Munich, Max Planck Inst.) ; Martyanov, Mikhail (Munich, Max Planck Inst.) ; Moody, Joshua (Munich, Max Planck Inst.) ; Muggli, Patric (Munich, Max Planck Inst.) ; Panuganti, Harsha (CERN) ; Szczurek, Krzysztof (CERN)
Publication	2019
Number of pages	4
In:	10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPGW054
DOI	10.18429/JACoW-IPAC2019-THPGW054
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN SPS ; AWAKE
Abstract	In the AWAKE experiment, the electron beam is used to probe the proton-driven wakefield acceleration in plasma. Electron bunches are produced using an rf-gun equipped with a Cs$_2$Te photocathode illuminated by an ultraviolet (UV) laser pulse. To generate the UV laser beam a fraction of the infrared (IR) laser beam used for production of rubidium plasma is extracted from the laser system, time-compressed to a picosecond scale and frequency tripled using nonlinear crystals. The optical line for transporting the laser beam over the 24 m distance was built using rigid supports for mirrors and air-evacuated tube to minimize beam-pointing instabilities. Construction of the UV beam optical system enables appropriate beam shaping and control of its size and position on the cathode, as well as time delay with respect to the IR pulse seeding the plasma wakefield.
Copyright/License	Publication: (License: CC-BY-3.0)

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