The resonant multi-pulse ionization injection

Tomassini, P.; Nicola, S. De; Labate, L.; Londrillo, P.; Fedele, R.; Terzani, Davide; Gizzi, L. A.

doi:10.1063/1.5000696

Cited by 41 publications

(71 citation statements)

References 55 publications

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“…One of the acceleration schemes proposed in order to obtain the high quality electron bunches required for EuPRAXIA is the so-called Resonant Multi-Pulse Ionization injection (ReMPI) scheme [7]. In this scheme, the wakefield is resonantly excited by a train of (relatively low intensity) pulses at the Ti:Sapphire (TiSa) fundamental wavelength, while ionization injection is driven by a shorter wavelength (second or third harmonic) pulse.…”

Section: Options For Pulse Train Generationmentioning

confidence: 99%

Conceptual Design of a Laser Driver for a Plasma Accelerator User Facility

et al. 2019

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The purpose of the European project EuPRAXIA is to realize a novel plasma accelerator user facility. The laser driven approach sets requirements for a very high performance level for the laser system: pulse peak power in the petawatt range, pulse repetition rate of several tens of Hz, very high beam quality and overall stability of the system parameters, along with 24/7 operation availability for experiments. Only a few years ago these performances were considered unrealistic, but recent advances in laser technologies, in particular in the chirped pulse amplification (CPA) of ultrashort pulses and in high energy, high repetition rate pump lasers have changed this scenario. This paper discusses the conceptual design and the overall architecture of a laser system operating as the driver of a plasma acceleration facility for different applications. The laser consists of a multi-stage amplification chain based CPA Ti:Sapphire, using frequency doubled, diode laser pumped Nd or Yb solid state lasers as pump sources. Specific aspects related to the cooling strategy of the main amplifiers, the operation of pulse compressors at high average power, and the beam pointing diagnostics are addressed in detail.Laser Accelerator) [4], with an average power output of tens of watts. New systems under realization aim to even higher average power levels, such as HAPLS targeting an output power of 300 W. Nonetheless, to address user-level requirements, the average power of ultrafast lasers needs to increase by one or two orders of magnitude.The purpose of the European project EuPRAXIA [5] is to provide a conceptual design for a compact, user-oriented, plasma accelerator with superior beam quality to enable free electron laser operation in the X-ray range. User requirements for an operational facility imply a significant increase of the laser driver output parameters with respect to systems currently available or under development: pulse peak power in the petawatt range, pulse repetition rate of several tens of Hz, as well as very high beam quality and overall stability of the system parameters.A description of the architecture of the laser driver was already published in previous work [6], describing the main parameters and technical solutions. This paper complements the previous one by recalling the general lines of the system architecture and addressing some specific points that are particularly critical for the system operation at high average power levels. These aspects are related to the amplifier's geometrical layout, the cooling solution to address the operation at high average power levels, and the laser beam transport-related issues.

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Section: Options For Pulse Train Generationmentioning

confidence: 99%

Conceptual Design of a Laser Driver for a Plasma Accelerator User Facility

et al. 2019

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“…A two-stage configuration was conceived and developed to this purpose and is now optimized to meet required electron beam performances. It is composed by a 150 MeV injector based on the resonant multipulse ionization injection (ReMPI) [22] and a 5 GeV booster, linked by a magnetic transfer line. The booster has been thoroughly optimized and it is proven that the above requested final beam parameters can be achieved, at the condition that beam quality at the booster entrance is large enough [23].…”

Section: Introductionmentioning

confidence: 99%

“…To implement a flexible and stable injection scheme capable of generating low-emittance bunches, we have proposed a technique that only makes use of a single 100-TW class Ti:Sa laser system. In the resonant multipulse ionization injection [22,37,38] scheme, the CO 2 driver is substituted by a train of pulses that excites the large amplitude wakefield through the multipulse LWFA mechanism [39][40][41][42] [see Fig. 1(a)], keeping each pulse electric field under the ionization threshold for the selected dopant.…”

Section: Introductionmentioning

confidence: 99%

High quality electron bunches for a multistage GeV accelerator with resonant multipulse ionization injection

Tomassini¹,

Terzani²,

Labate

et al. 2019

Phys. Rev. Accel. Beams

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Laser wakefield acceleration of GeV electrons is becoming a mature technique, so that a reliable accelerator delivering stable beams to users communities can now be considered. In such a context, two plasma stages, one injector and one booster stage, offer a flexible solution for optimization. For the injector we consider here the resonant multipulse ionization injection (ReMPI) that can be optimized to generate electron bunches with high enough quality to be efficiently transported to the second stage. In order to better control the beam-loading effect and optimize the beam manipulation after the plasma downramp, a quasiround beam is preferable. In this respect, we present analytical and particle-in-cell results concerning the tunnel-ionization process in presence of two, orthogonally polarized, laser pulses with different wavelengths. We also show, by means of hybrid fluid/PIC numerical simulations, that a stable working point with the ReMPI injector exists at 32 pC, 4 kA peak current, with mean energy of 150 MeV, energy spread of 1.65% rms, normalized emittance ϵ n ¼ 0.23 μm and divergence of 0.6 mrad. The scheme relies on a 150 TW Ti:Sa laser modified to achieve a four-pulses driver train and a third harmonics ionization pulse.

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“…The main approach consists in injecting low-emittance electron bunches in the plasma wave. Among the different models proposed, the Resonant Multi-Pulse Ionization injection (ReMPI) [1] relies on the plasma wake being excited by a train of pulses produced from a single high-energy, ultra short laser pulse. The theory of plasma wave excitation by a pulse train was presented in [2,3] (and more recently discussed in [4]); the scheme takes advantage of the coherent sum of the wakefields produced by each pulse of the train (the pulses being separated in time by a plasma period) to excite a plasma wave with suitable amplitude.…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Modelling of pulse train generation for resonant laser wakefield acceleration using a delay mask

Vantaggiato

Labate

Tomassini

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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A new method for the generation of a train of pulses from a single high-energy, ultra short pulse is presented, suited for Resonant Multi-Pulse Ionization injection [1]. The method is based on different transverse portion of the pulse being delayed by a "mask" sectioned in concentric zones with different thicknesses, in order to deliver multiple laser pulses. The mask is placed right before the last focusing parabola. A hole in the middle of the mask lets part of the original pulse to pass through to drive electron injection. In this paper a full numerical modelling of this scheme is presented. In particular we discuss the spatial and temporal profile of the pulses emerging from the mask and how they are related to the radius and thickness of each section.

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The resonant multi-pulse ionization injection

Cited by 41 publications

References 55 publications

Conceptual Design of a Laser Driver for a Plasma Accelerator User Facility

Conceptual Design of a Laser Driver for a Plasma Accelerator User Facility

High quality electron bunches for a multistage GeV accelerator with resonant multipulse ionization injection

Modelling of pulse train generation for resonant laser wakefield acceleration using a delay mask

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