Plasma Wakefields in the Quasi-Nonlinear Regime

Rosenzweig, James; Andonian, G.; Ferrario, M.; Muggli, P.; Williams, O.; Yakimenko, V.; Ke, Xuan

doi:10.1063/1.3520373

Cited by 27 publications

(11 citation statements)

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“…The E z -field generated by the proton drive beam is seen as the blue line, shown with and without the electron beam present. With a proton beam density n pb n 0 , the wakefields are in the quasi-linear regime [8]. The dashed green line in the lower part of Fig.…”

Section: Simulation Parametersmentioning

confidence: 95%

“…In this paper we present simulation results showing how emittance preservation of a high charge density witness beam can be ensured when accelerated by a proton drive beam producing quasi-linear wakefields [8]. By quasi-linear wakefields we here mean wakefields with only partial blow out of the plasma electrons in the accelerating structure (bubble).…”

Section: Introductionmentioning

confidence: 99%

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Emittance preservation of an electron beam in a loaded quasilinear plasma wakefield

Olsen

Adli

Muggli

2018

Phys. Rev. Accel. Beams

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We investigate beam loading and emittance preservation for a high-charge electron beam being accelerated in quasi-linear plasma wakefields driven by a short proton beam. The structure of the studied wakefields are similar to those of a long, modulated proton beam, such as the AWAKE proton driver. We show that by properly choosing the electron beam parameters and exploiting two well known effects, beam loading of the wakefield and full blow out of plasma electrons by the accelerated beam, the electron beam can gain large amounts of energy with a narrow final energy spread (%-level) and without significant emittance growth.

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Section: Simulation Parametersmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Emittance preservation of an electron beam in a loaded quasilinear plasma wakefield

Olsen

Adli

Muggli

2018

Phys. Rev. Accel. Beams

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“…In this work, we focus on the latter. One can use short -shorter than the plasma period -drive bunches in quasi-linear [10] or blowout [11,12] regimes. Alternatively, one may harness the self-modulation of longer bunches in plasma [13,14].…”

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confidence: 99%

Stable Particle Acceleration in Coaxial Plasma Channels

Pukhov

Farmer

2018

Phys. Rev. Lett.

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Plasma wakefields [1] offer a potential basis for novel high-energy particle accelerators [2] due to the high field gradients plasma can support. In this work, we investigate the use of a pre-formed plasma channel for the controlled monoenergetic acceleration of a witness [3]. Typically acceleration in such hollow plasma channels, as well as in dielectric waveguides [4], is limited by the beam breakup (BBU) instability [5][6][7]. Using three-dimensional particle-in-cell simulations, we show for the first time that BBU can be avoided by using a co-axial plasma filament in the hollow channel. The highcurrent electron driver scatters electrons from the on-axis filament, leaving an ion column which focuses both the driver and the trailing electron witness bunch. The slow pinching of the ion column leads to a strong dynamic chirp of the effective betatron frequency along the beam length, preventing growth of the BBU instability. We show that this stable configuration allows transformer ratios as high as 10 to be achieved with an energy efficiency of 40%. The co-axial channel is also suitable for high-gradient acceleration of donut-shaped positron bunches.Plasma-based accelerators consist of a driver which excites a plasma wake, which is in turn used to accelerate a trailing witness bunch. The driver can be either an intense laser pulse [8] or a charged particle bunch [9]. In this work, we focus on the latter. One can use short -shorter than the plasma period -drive bunches in quasi-linear [10] or blowout [11,12] regimes. Alternatively, one may harness the self-modulation of longer bunches in plasma [13,14]. For the accelerating medium, one may choose either uniform plasma [9], or a pre-formed plasma channel [15]. Each of these regimes has its own particular advantages and drawbacks.Perhaps the most promising accelerating scheme is that of the hollow plasma channel [3]. A radially symmetric drive bunch in a cylindrical channel does not generate any focusing or defocusing fields, which would guarantee the conservation of the transverse emittance of the witness [16]. Further, the accelerating field is uniform across the hollow channel, allowing monoenergetic acceleration. A high quality witness bunch is vital for a number of applications, such as future high-energy colliders [17] or XFEL machines [18]. Thus, hollow-plasma-channel acceleration appears the perfect candidate for next-generation particle accelerators.Unfortunately, hollow plasma channels suffer from a severe drawback -the beam breakup (BBU) instability [5,6]. As a charged bunch propagates in a hollow channel, plasma electrons in the channel wall respond. The resulting spacecharge results in an attractive force between the bunch and the wall. The plasma response increases as the bunch moves towards the wall, increasing the attractive force. This instability manifests as a hosing of the beam: an oscillation of the beam centroid along its length [19]. Ultimately, the bunch tail hits the wall of the channel and the bunch is destroyed. The characteristic growth d...

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“…In 1D cases a key parameter to evaluate the departure from linearity is the α-value, where α = n b, peak /n 0 with n b, peak the peak bunch density and n 0 the initial plasma density, since it allows to distinguish among the different regimes [30]: linear, weakly-non-linear and non-linear regime. In three dimensions the same role is played by the normalized charge Q, defined as the the ratio of the number of bunch electrons and the plasma electrons in a cubic skin depth k −3 p [31]. Linear regimes, weakly nonlinear regimes and highly nonlinear regimes correspond to normalized charge values Q 1, Q 1, Q 1 respectively.…”

Section: Comparison With 3d Full Pic Codementioning

confidence: 99%