Experimental characterization of active plasma lensing for electron beams

Pompili, R.; Anania, M. P.; Bellaveglia, M.; Biagioni, A.; Bini, S.; Bisesto, F.; Brentegani, E.; Castorina, Giovanni; Chiadroni, E.; Cianchi, A.; Croia, M.; Giovenale, D. Di; Ferrario, M.; Filippi, F.; Giribono, Anna; Lollo, V.; Marocchino, A.; Marongiu, Marco; Mostacci, A.; Pirro, Giampiero Di; Romeo, S.; Rossi, A. R.; Scifo, J.; Shpakov, V.; Vaccarezza, C.; Villa, F.; Zigler, A.

doi:10.1063/1.4977894

Cited by 54 publications

(45 citation statements)

References 33 publications

(29 reference statements)

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“…Although APLs provide kT/m focusing fields, orders of magnitude stronger focusing compared to conventional quadrupole magnets, they can suffer from aberrations that increase the emittance of the beam being focused [13,14]. 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.…”

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confidence: 99%

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: 99%

Emittance Preservation in an Aberration-Free Active Plasma Lens

et al. 2018

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“…The proposal for the RF injector foresees a SPARC-like S-band photo-injector [3] coupled with a Xband linac booster [4,5] (see Figure 1). The choice for the RF photo-injector has been guided by the expertise acquired at SPARC LAB [6] in the stable and routinely generation and manipulation of high brightness electron beams useful for plasmabased experiments [7,8] and generation of advanced radiation sources [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

EuPRAXIA@SPARC_LAB: The high-brightness RF photo-injector layout proposal

Giribono

Bacci

Chiadroni

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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At EuPRAXIA@SPARC LAB, the unique combination of an advanced high-brightness RF injector and a plasma-based accelerator will drive a new multi-disciplinary user-facility. The facility, that is currently under study at INFN-LNF Laboratories (Frascati, Italy) in synergy with the EuPRAXIA collaboration, will operate the plasma-based accelerator in the external injection configuration. Since in this configuration the stability and reproducibility of the acceleration process in the plasma stage is strongly influenced by the RF-generated electron beam, the main challenge for the RF injector design is related to generating and handling high quality electron beams. In the last decades of R&D activity, the crucial role of high-brightness RF photo-injectors in the fields of radiation generation and advanced acceleration schemes has been largely established, making them effective candidates to drive plasmabased accelerators as pilots for user facilities. An RF injector consisting in a high-brightness S-band photo-injector followed by an advanced X-band linac has been proposed for the EuPRAXIA@SPARC LAB project. The electron beam dynamics in the photoinjector has been explored by means of simulations, resulting in high-brightness, ultra-short bunches with up to 3 kA peak current at the entrance of the advanced X-band linac booster. The EuPRAXIA@SPARC LAB high-brightness photo-injector is described here together with performance optimisation and sensitivity studies aiming to actual check the robustness and reliability of the desired working point.

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“…Active plasma lenses [21] (APLs) potentially offer an elegant solution with their compact size, azimuthally symmetric focusing, and high magnetic field gradients, which have been shown to exceed 3 kT/m [22]. Recent studies indicate that nonuniform current densities may form inside discharge capillary based APLs [23][24][25][26][27], leading to nonlinear magnetic field gradients and, subsequently, emittance deterioration [28,29].…”

Section: Introductionmentioning

confidence: 99%

Direct measurement of focusing fields in active plasma lenses

Röckemann

Schaper

Barber

et al. 2018

Phys. Rev. Accel. Beams

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Active plasma lenses have the potential to enable broad-ranging applications of plasmabased accelerators owing to their compact design and radially symmetric kT/m-level focusing fields, facilitating beam-quality preservation and compact beam transport. We report on the direct measurement of magnetic field gradients in active plasma lenses and demonstrate their impact on the emittance of a charged particle beam. This is made possible by the use of a well-characterized electron beam with 1.4 mm mrad normalized emittance from a conventional accelerator. Field gradients of up to 823 T/m are investigated. The observed emittance evolution is supported by numerical simulations, which suggest the potential for conservation of the core beam emittance in such a plasma lens setup.

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Experimental characterization of active plasma lensing for electron beams

Cited by 54 publications

References 33 publications

Emittance Preservation in an Aberration-Free Active Plasma Lens

Emittance Preservation in an Aberration-Free Active Plasma Lens

EuPRAXIA@SPARC_LAB: The high-brightness RF photo-injector layout proposal

Direct measurement of focusing fields in active plasma lenses

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