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Anomalous Beam Transport through Gabor (Plasma) Lens Prototype

Department of Physics, Imperial College London, Exhibition Road, London SW7 2AZ, UK
Department of Physics, SUPA, University of Strathclyde, 16 Richmond Street, Glasgow G4 0NG, UK
STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, UK
John Adams Institute for Accelerator Science, Imperial College London, London SW7 2AZ, UK
Authors to whom correspondence should be addressed.
Academic Editor: Paolo Branchini
Appl. Sci. 2021, 11(10), 4357;
Received: 13 April 2021 / Revised: 3 May 2021 / Accepted: 4 May 2021 / Published: 11 May 2021
(This article belongs to the Section Applied Physics)
An electron plasma lens is a cost-effective, compact, strong-focusing element that can ensure efficient capture of low-energy proton and ion beams from laser-driven sources. A Gabor lens prototype was built for high electron density operation at Imperial College London. The parameters of the stable operation regime of the lens and its performance during a beam test with 1.4 MeV protons are reported here. Narrow pencil beams were imaged on a scintillator screen 67 cm downstream of the lens. The lens converted the pencil beams into rings that show position-dependent shape and intensity modulation that are dependent on the settings of the lens. Characterisation of the focusing effect suggests that the plasma column exhibited an off-axis rotation similar to the m=1 diocotron instability. The association of the instability with the cause of the rings was investigated using particle tracking simulations. View Full-Text
Keywords: plasma trap; space-charge lens; beam transport; instability; proton therapy plasma trap; space-charge lens; beam transport; instability; proton therapy
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MDPI and ACS Style

Nonnenmacher, T.; Dascalu, T.-S.; Bingham, R.; Cheung, C.L.; Lau, H.-T.; Long, K.; Pozimski, J.; Whyte, C. Anomalous Beam Transport through Gabor (Plasma) Lens Prototype. Appl. Sci. 2021, 11, 4357.

AMA Style

Nonnenmacher T, Dascalu T-S, Bingham R, Cheung CL, Lau H-T, Long K, Pozimski J, Whyte C. Anomalous Beam Transport through Gabor (Plasma) Lens Prototype. Applied Sciences. 2021; 11(10):4357.

Chicago/Turabian Style

Nonnenmacher, Toby, Titus-Stefan Dascalu, Robert Bingham, Chung Lim Cheung, Hin-Tung Lau, Ken Long, Jürgen Pozimski, and Colin Whyte. 2021. "Anomalous Beam Transport through Gabor (Plasma) Lens Prototype" Applied Sciences 11, no. 10: 4357.

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