Wuppertal 2015 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 2: PWA / TNSA I
AKBP 2.8: Vortrag
Montag, 9. März 2015, 15:45–16:00, BZ.08.04 (HS 2)
Observation of collective deceleration of electrons from laser wakefield acceleration — •Shao-wei Chou1,2, Jaincai Xu1, Konstantin Khrennikov2, Laszlo Veisz1, and Stefan Karsch1,2 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermannstr. 1, D-85748 Garching, Germany — 2Ludwig-Maximilians-Universität, Am Coulombwall 1, D-85748 Garching, Germany
Electrons from Laser Wakefield Acceleration (LWFA) have been shown having an ultra-short, sub-5 fs temporal structure accompanying with a small transverse initial size. These electron bunches can drive a wakefield efficiently in an underdense plasma and lose their energy. We used ATLAS, a Ti:Sapphire based 100 TW laser as a driver for LWFA. A target for electron generation included a 0.3 mm diameter supersonic helium gas jet with shock front injection, and another 1.5 mm gas jet was used as a target for electron deceleration. The measurement has shown that the electron energy as well as the total bunch charge were dumped under certain conditions almost completely (>90%) right after insertion of second jet. This effect was observed even with several mm separations between two jets. The divergence (~8 mrad) and total charge (~30 pC) from the first jet made an ideal bunch for driving plasma wave in second jet. The observed peak deceleration gradient was up to 23.7 GeV/m and 5.1 GeV/m in average. We interpret the observation by collective deceleration. Our measurement has demonstrated the feasibility of an efficient potential driver for particle-driven plasma wakefield acceleration as well as a compact beam dump for the future development the LWFA application.