Laser beam coupling with capillary discharge plasma for laser wakefield acceleration applications

Bagdasarov, G. A.; Sasorov, P. V.; Gasilov, V. A.; Boldarev, A. S.; Olkhovskaya, O. G.; Benedetti, C.; Bulanov, Stepan; Gonsalves, A. J.; Mao, Hann-Shin; Schroeder, C. B.; Tilborg, J. van; Esarey, E.; Leemans, Wim; Levato, T.; Margarone, D.; Korn, G.

doi:10.1063/1.4997606

Cited by 27 publications

(17 citation statements)

References 29 publications

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“…To account for the additional uncertainty owing to the fringe field, the data in Fig. 3 was fitted for the range of L fringe ≤ 0.5 mm (which is well above the length found in [31]). The derived core gradients g core for L fringe = 0.25 mm including the systematic uncertainty for L fringe ≤ 0.5 mm can be found in Tab.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…3 and are found to be linearly depending on the offset. The formation of fringe fields in APLswas discussed in [31]. Their influence on the emittance of a passing MaMi-type beam was simulated in ASTRA [32] and found to be negligible on the sub-percent level.…”

Section: Resultsmentioning

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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“…The external edges of the capillary can suffer of damages induced by the wings present in the laser focal spot. Such problem is already reported in literature [31][32][33][34][35] and two solutions to moderate the wings are discussed hereafter: (i) the laser beam apodization and (ii) the use of the deformable mirror (see Section 2.3). Figure 9 shows the simplest conceptual scheme that is considered for the apodization simulation.…”

Section: The Hell Platformmentioning

confidence: 87%

“…For this reason, we performed simulations on initial filling of the capillary with neutral hydrogen, using 3D gas-dynamic simulations that take into account the capillary design, including filling supplies. Results of the gas simulations were used as an initial condition for the capillary discharge MHD simulations [32].…”

Section: Appl Sci 2018 8 X For Peer Review 8 Of 20mentioning

confidence: 99%

HELL: High-Energy Electrons by Laser Light, a User-Oriented Experimental Platform at ELI Beamlines

et al. 2018

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Laser wake field acceleration (LWFA) is an efficient method to accelerate electron beams to high energy. This is a benefit in research infrastructures where a multidisciplinary environment can benefit from the different secondary sources enabled, having the opportunity to extend the range of applications that is accessible and to develop new ideas for fundamental studies. The ELI Beamline project is oriented to deliver such beams to the scientific community both for applied and fundamental research. The driver laser is a Ti:Sa diode-pumped system , running at a maximum performance of 10 Hz, 30 J, and 30 fs. The possibilities to setup experiments using different focal lengths parabolas, as well as the possibility to counter-propagate a second laser beam intrinsically synchronized, are considered in the electron acceleration program. Here, we review the laser-driven electron acceleration experimental platform under implementation at ELI Beamlines, the HELL (High-energy Electrons by Laser Light) experimental platform .

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“…Using nanosecond-scale heater pulses, this can induce significant heating in hydrogen discharge plasmas that typically have temperature distributions peaking at a few eV [25]. Both the plasma channel formation from the discharge and the channel modification through IB heating were modeled with the multi-dimensional code marple (Magnetically Accelerated Radiative PLasma Explorer) [30][31][32], with the laser heating rate calculated using equations 1 and 2. Additional modules from inf&rno [33,34] were used to calculate the heater laser pulse propagation.…”

Section: Introductionmentioning

confidence: 99%

Laser-heated capillary discharge plasma waveguides for electron acceleration to 8 GeV

et al. 2020

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A plasma channel created by the combination of a capillary discharge and inverse Bremsstrahlung laser heating enabled the generation of electron bunches with energy up to 7.8 GeV in a laser-driven plasma accelerator. The capillary discharge created an initial plasma channel and was used to tune the plasma temperature, which optimized laser heating. Although optimized colder initial plasma temperatures reduced the ionization degree, subsequent ionization from the heater pulse created a fully ionized plasma on-axis. The heater pulse duration was chosen to be longer than the hydrodynamic timescale of ≈ 1 ns, such that later temporal slices were more efficiently guided by the channel created by the front of the pulse. Simulations are presented that show this thermal self-guiding of the heater pulse enabled channel formation over 20 cm. The post-heated channel had lower on-axis density and increased focusing strength compared to relying on the discharge alone, which allowed for guiding of relativistically intense laser pulses with peak power of 0.85 PW and wakefield acceleration over 15 diffraction lengths. Electrons were injected into the wake in multiple buckets and times, leading to several electron bunches with different peak energies. To create single electron bunches with low energy spread, experiments using localized ionization injection inside a capillary discharge waveguide were performed. A single injected bunch with energy 1.6 GeV, charge 38 pC, divergence 1 mrad, and relative energy spread below 2 percent full width half maximum was produced in a 3.3 cm-long capillary discharge waveguide. This development shows promise for mitigation of energy spread and future high-efficiency staged acceleration experiments.

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Laser beam coupling with capillary discharge plasma for laser wakefield acceleration applications

Cited by 27 publications

References 29 publications

Direct measurement of focusing fields in active plasma lenses

Direct measurement of focusing fields in active plasma lenses

HELL: High-Energy Electrons by Laser Light, a User-Oriented Experimental Platform at ELI Beamlines

Laser-heated capillary discharge plasma waveguides for electron acceleration to 8 GeV

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