Dortmund 2021 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 11: Diagnostics, Control and Instrumentation III

AKBP 11.1: Vortrag

Donnerstag, 18. März 2021, 16:30–16:45, AKBPa

Experimental investigation of quadrupole-doublet alignment on the focus of laser-accelerated ions — •Luisa Tischendorf, Thomas Rösch, Felix Balling, Marc W. Berndl, Leonard Doyle, Lotta Flaig, Jens Hartmann, Sonja Kundel, and Jörg Schreiber — Ludwig-Maximilians-Universität München, Germany

Employing laser-accelerated ions in radiation related research requires control of ion bunch characteristics such as the energy spectrum and beam size. At the Centre for Advanced Laser Applications (CALA) we have investigated for this purpose a quadrupole doublet consisting of two permanent magnet quadrupoles (PMQs). The broad input energy distribution strongly determines the appearance of the proton focus at 1.8 m remote location, which we observe on a scintillating screen. Misalignments strongly affect the appearance of the downstream focus. We conducted a detailed experiment in which alignment parameters of the focusing system were varied to investigate their effect on the focal shape. We identified a smallest possible spot with dimension 1.2 mm by 0.8 mm. Buch profile calculations based on the matrix formalism provide a comparison to the experimental results and reveal that the source size of the proton emission in the laser-driven plasma is not negligible. This observation could provide an elegant way for determining the particle source emittance in future experiments.