Direct measurement of focusing fields in active plasma lenses

Röckemann, J.-H.; Schaper, L.; Barber, Sarah; Bobrova, N. A.; Boyle, G.; Bulanov, Stepan; Delbos, N.; Floettmann, K.; Kube, G.; Lauth, W.; Leemans, Wim; Libov, V.; Maier, Andreas R.; Meisel, Martin; Messner, Philipp; Sasorov, P. V.; Schroeder, C. B.; Tilborg, J. van; Wesch, S.; Osterhoff, Jens

doi:10.1103/physrevaccelbeams.21.122801

Cited by 20 publications

(17 citation statements)

References 44 publications

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“…One such aberration is caused by plasma temperature gradients in the capillary (colder plasma closer to the wall), which leads to a radially nonlinear magnetic field distribution [15,16] with enhanced focusing closer to the axis. This spherical aberration has been indirectly demonstrated in both helium [17] and hydrogen [18], by measurements of on axis field gradient enhancement and the formation of ring-shaped beams.…”

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confidence: 89%

Emittance Preservation in an Aberration-Free Active Plasma Lens

et al. 2018

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Active plasma lensing is a compact technology for strong focusing of charged particle beams, which has gained considerable interest for use in novel accelerator schemes. While providing kT/m focusing gradients, active plasma lenses can have aberrations caused by a radially nonuniform plasma temperature profile, leading to degradation of the beam quality. We present the first direct measurement of this aberration, consistent with theory, and show that it can be fully suppressed by changing from a light gas species (helium) to a heavier gas species (argon). Based on this result, we demonstrate emittance preservation for an electron beam focused by an argon-filled active plasma lens.

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confidence: 89%

Emittance Preservation in an Aberration-Free Active Plasma Lens

et al. 2018

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“…Thus, separate beam optics are required to manipulate duration and focusing individually, e.g., via chirped and parabolic mirrors [37]. A discharge-capillary active plasma lens (APL) [59][60][61][62][63] allows for single-element symmetric electron bunch focusing at short focal length [60,63] while preserving the beam emittance [62].…”

Section: A General Radiation Characteristics and Design Considerationsmentioning

confidence: 99%

“…Here, we assume a linear radial magnetic field gradient in the capillary without temperature-related effects [61,62]. Also, fringe fields at the capillary edges play no role [63].…”

Section: Active Plasma Lens Focusingmentioning

confidence: 99%

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Design study for a compact laser-driven source for medical x-ray fluorescence imaging

Brümmer

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Pausch

et al. 2020

Phys. Rev. Accel. Beams

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Thomson scattering sources with their hard x-ray pencil beams represent a promising candidate to drive high-resolution X-ray Fluorescence Imaging (XFI). As XFI is a scanning imaging modality, it specifically requires pencil-beam geometries along with a high beam mobility. In combination with laser-wakefield acceleration (LWFA) such sources could provide the compactness needed for a future transition into clinical application. A sufficient flux within a small bandwidth could enable in-vivo high-sensitivity XFI for early cancer diagnostics and pharmacokinetic imaging. We thus report on a specific all-laser driven source design directed at increasing the photon number within the bandwidth and opening angle defined by XFI conditions. Typical parameters of driver lasers and electron bunches from LWFA are utilized and controlled within realistic parameter regions on the basis of appropriate beam optics. An active plasma lens is implemented for chromatic focal control of the bunch. Source performance limits are identified and compared to existing x-ray sources with regard to their potential to be implemented in future clinical XFI.

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“…PPL is further developed theoretically [26] and used for an LPA experiment [27]. Active Plasma Lens (APL), where the azimuthal magnetic field is controlled by a discharge in the plasma, has been proposed [28,29]. APL has been applied to ion beams [28,30] and to LPA applications [31][32][33][34][35].…”

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confidence: 99%

Permanent Magnet-Based Quadrupoles for Plasma Acceleration Sources

et al. 2019

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The laser plasma accelerator has shown a great promise where it uses plasma wakefields achieving gradients as high as GeV/cm. With such properties, one would be able to build much more compact accelerators, compared to the conventional RF ones, that could be used for a wide range of fundamental research and applied applications. However, the electron beam properties are quite different, in particular, the high divergence, leading to a significant growth of the emittance along the transport line. It is, thus, essential to mitigate it via a strong focusing of the electron beam to enable beam transport. High-gradient quadrupoles achieving a gradient greater than 100 T/m are key components for handling laser plasma accelerator beams. Permanent magnet technology can be used to build very compact quadrupoles capable of providing a very large gradient up to 500 T/m. We present different designs, modeled with a 3D magnetostatic code, of fixed and variable systems. We also review different quadrupoles that have already been built and one design is compared to measurements.

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Direct measurement of focusing fields in active plasma lenses

Cited by 20 publications

References 44 publications

Emittance Preservation in an Aberration-Free Active Plasma Lens

Emittance Preservation in an Aberration-Free Active Plasma Lens

Design study for a compact laser-driven source for medical x-ray fluorescence imaging

Permanent Magnet-Based Quadrupoles for Plasma Acceleration Sources

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