Laser-ionized, beam-driven, underdense, passive thin plasma lens

Doss, Christopher; Adli, E.; Ariniello, Robert; Cary, John R.; Corde, S.; Hidding, B.; Hogan, Mark; Hunt-Stone, Keenan; Joshi, C.; Marsh, K. A.; Rosenzweig, James; Vafaei-Najafabadi, Navid; Yakimenko, V.; Litos, M.

doi:10.1103/physrevaccelbeams.22.111001

Cited by 35 publications

(19 citation statements)

References 39 publications

(52 reference statements)

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“…Such a focusing system will also be needed for the FACET-II experiment E-314 on ion motion, with its attendant search for formation of ion-beam electron focused Bennett-form equilibria [41]. Alternatively, one may use an underdense plasma lens for the final focusing element, as already proposed for FACET-II [42], with implementation now being initiated.…”

Section: Discussion and Outlook For Facet-ii Experimentsmentioning

confidence: 99%

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Resonant excitation of very high gradient plasma wakefield accelerators by optical-period bunch trains

Manwani,

Majernik,

Rosenzweig

2020

Preprint

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Using a periodic electron beam bunch train to resonantly excite plasma wakefields in the quasinonlinear (QNL) regime has distinct advantages over employing a single, higher charge bunch. Resonant excitation in the QNL regime can produce plasma electron blowout using very low emittance beams with a small charge per pulse: the local density perturbation is extremely nonlinear, achieving total rarefaction, yet the resonant response of the plasma electrons at the plasma frequency is preserved. Such a pulse train, with inter-bunch spacing equal to the plasma period, can be produced via inverse free-electron laser bunching. To achieve resonance with a laser wavelength of a few microns, a high plasma density is used, with the attendant possibility of obtaining extremely large wakefield amplitude, near 1 TV/m for FACET-II parameters. In this article, we use particle-in-cell simulations to study the plasma response, the beam modulation evolution, and the instabilities encountered, that arise when using a bunching scheme to resonantly excite waves in a dense plasma.

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Section: Discussion and Outlook For Facet-ii Experimentsmentioning

confidence: 99%

“…Many diagnostic systems needed for characterizing the beam will be available at FACET-II [7,42]. These include: the betatron radiation spectrum via a Compton/pair spectrometer, as described in Ref.…”

Section: Discussion and Outlook For Facet-ii Experimentsmentioning

confidence: 99%

Resonant excitation of very high gradient plasma wakefield accelerators by optical-period bunch trains

Manwani,

Majernik,

Rosenzweig

2020

Preprint

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“…The defining characteristic of APLs is that the focusing magnetic field is directly generated by the discharge current. This is different from a passive plasma lens in underdense regime [13][14][15], which uses the transverse plasma wakefield created by the charged particle beam as a focusing field. When the longitudinal shape of the beam is Gaussian, the longitudinal and transverse wakefield are different at each slice of the beam in the linear regime of the plasma wakefield [16,17], because the wakefield generated by the particle beam is a convolution over the longitudinal beam distribution [18].…”

Section: Introductionmentioning

confidence: 99%

Witness electron beam injection using an active plasma lens for a proton beam-driven plasma wakefield accelerator

Kim,

Moon,

Chung

et al. 2021

Preprint

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An active plasma lens focuses the beam in both the horizontal and vertical planes simultaneously using a magnetic field generated by a discharge current through the plasma. A beam size of 5-10 µm can be achieved using an focusing gradient on the order of 100 T/m. The active plasma lens is therefore an attractive element for plasma wakefield acceleration, because an ultra-small size of the witness electron beam is required for injection into the plasma wakefield to minimize emittance growth and to enhance the capturing efficiency. When the driving beam and witness electron beam co-propagate through the active plasma lens, interactions between the driving and witness beams and the plasma must be considered. In this paper, through particle-in-cell simulations, we discuss the possibility of using an active plasma lens for the final focusing of the electron beam in the presence of driving proton bunches. The beam parameters for AWAKE Run 2 are taken as an example for this type of application. It is confirmed that the amplitude of the plasma wakefield excited by proton bunches remains the same even after propagation through the active plasma lens. The emittance of the witness electron beam increases rapidly in the plasma density ramp regions of the lens. Nevertheless, when the witness electron beam has a charge of 100 pC, emittance of 10 mm mrad, and bunch length of 60 µm, its emittance growth is not significant along the active plasma lens. For small emittance, such as 2 mm mrad, the emittance growth is found to be strongly dependent on the plasma density.

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“…Both weak and strong chromatic effects [48] were observed with the potential to cause emittance degradation [49]. Research at SLAC seeks to demonstrate the use of such a plasma lens for staging in plasma wakefield acceleration or in radially-symmetric final focusing for linear colliders [50]. As compact and tunable devices, active plasma lenses [51,52] are a promising solution for the extraction and transport of the witness bunch while removing the driver without loss of beam quality [53][54][55].…”

Section: Introductionmentioning

confidence: 99%

Anomalous Beam Transport through Gabor (Plasma) Lens Prototype

et al. 2021

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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.

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Laser-ionized, beam-driven, underdense, passive thin plasma lens

Cited by 35 publications

References 39 publications

Resonant excitation of very high gradient plasma wakefield accelerators by optical-period bunch trains

Resonant excitation of very high gradient plasma wakefield accelerators by optical-period bunch trains

Witness electron beam injection using an active plasma lens for a proton beam-driven plasma wakefield accelerator

Anomalous Beam Transport through Gabor (Plasma) Lens Prototype

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