Observation of strong correlation between quasimonoenergetic electron beam generation by laser wakefield and laser guiding inside a preplasma cavity

Hosokai, Tomonao; Kinoshita, K.; Ohkubo, Takeru; Maekawa, Akira; Uesaka, Mitsuru; Zhidkov, Alexei; Yamazaki, A.; Kotaki, Hajime; Kando, M.; Nakajima, Kazuhisa; Bulanov, Sergei V.; Tomassini, P.; Giulietti, A.; Giulietti, Danilo

doi:10.1103/physreve.73.036407

Cited by 85 publications

(56 citation statements)

References 36 publications

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“…Results on the production of mono-energetic beams in self-injected laser wakefields from both experiments (solid symbols) and particle-in-cell simulations [4,5,6,7,8,9,10,11,12,13,14,15] have been collated in figure 1.…”

Section: Introductionmentioning

confidence: 99%

Self-Guided Wakefield Experiments Driven by Petawatt-Class Ultrashort Laser Pulses

Mangles

Thomas

Bellei

et al. 2008

IEEE Trans. Plasma Sci.

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We investigate the extension of self-injecting laser wakefield experiments to the regime that will be accessible with the next generation of petawatt class ultra-short pulse laser systems. Using linear scalings, current experimental trends and numerical simulations we determine the optimal laser and target parameters, i.e. focusing geometry, plasma density and target length, that are required to increase the electron beam energy (to > 1 GeV) without the use of external guiding structures.

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Section: Introductionmentioning

confidence: 99%

Self-Guided Wakefield Experiments Driven by Petawatt-Class Ultrashort Laser Pulses

Mangles

Thomas

Bellei

et al. 2008

IEEE Trans. Plasma Sci.

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“…The generation of QMEs has now been reported from many groups around the world, and its optimization, scaling, beam quality, and stability has been studied [60][61][62][63][64][65][66][67][68][69][70][71][72][73]. Re- One can see that the peak energy is comparable to the observed maximum energy from SM-LWFAs.…”

Section: Plasma Based Accelerator Experimentsmentioning

confidence: 85%

“…In the U-Tokyo experiments, the external magnetic field was used to condition the pre-formed plasma generated by a laser pre-pulse. Their early work was focused on how the laser pre-pulse affected the injection and acceleration processes [46,47,63]. By having an active control of the pre-pulse induced pre-formed plasma such that the plasma profile had a channel-like property, the resultant e-beams were improved to have smaller beam divergence, higher total charge, and higher stability (100% injection) [82].…”

Section: Plasma Based Accelerator Experimentsmentioning

confidence: 99%

“…To detect the relativistic electron, a variety of detectors have been employed: surface barrier detectors (SBD) [16,25,26,48], scintilators with photomultipliers (scintillator-PMP) [28,33,51,158], cloud chambers [16], Cerenkov radiation imaged by a camera [88], thermoluminescent dosimeters (TLD) [55], scintillating fibers [159,160], Radiochromic film [161], imaging plates (IP) [57,60,64,65,162], and scintillating (or phosphor) screens, mostly Gadox (Gd 2 O 2 S : Tb) [163] with films [26] or cameras (scintillator-camera) [16,28,39,53,56,63,72,164]. Detection by a SBD and scintillator-PMP were popular methods in early LWFA experiments due to their high sensitivity.…”

Section: Spectrometer Designmentioning

confidence: 99%

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Control of Laser Plasma Based Accelerators up to 1 GeV

Nakamura

2007

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This dissertation documents the development of a broadband electron spectrometer (ESM) for GeV class Laser Wakefield Accelerators (LWFA), the production of high quality GeV electron beams (e-beams) for the first time in a LWFA by using a capillary discharge guide (CDG), and a statistical analysis of CDG-LWFAs.An ESM specialized for CDG-LWFAs with an unprecedentedly wide momentum acceptance, from 0.01 to 1.1 GeV in a single shot, has been developed. Simultaneous measurement of e-beam spectra and output laser properties as well as a large angular acceptance (> ±10 mrad) were realized by employing a slitless scheme. A scintillating screen (LANEX Fast back ,LANEX-FB) -camera system allowed faster than 1 Hz operation and evaluation of the spatial properties of e-beams. The design provided sufficient resolution for the whole range of the ESM (below 5% for beams with 2 mrad divergence).The calibration between light yield from LANEX-FB and total charge, and a study on the electron energy dependence (0.071 to 1.23 GeV) of LANEX-FB were performed at the Advanced light source (ALS), Lawrence Berkeley National Laboratory (LBNL). Using this calibration data, the developed ESM provided a charge measurement as well.The production of high quality electron beams up to 1 GeV from a centimeter-scale ii accelerator was demonstrated. The experiment used a 310 µm diameter gas-filled capillary discharge waveguide that channeled relativistically-intense laser pulses (42 TW, A statistical analysis of the CDG-LWFAs' performance was carried out. By taking advantage of the high repetition rate experimental system, several thousands of shots were taken in a broad range of the laser and plasma parameters. An analysis program was developed to sort and select the data by specified parameters, and then to evaluate performance statistically.The analysis suggested that the generation of GeV-level beams comes from a highly unstable and regime. By having the plasma density slightly above the threshold density for self injection, 1) the longest dephasing length possible was provided, which led to the generation of high energy e-beams, and 2) the number of electrons injected into the wakefield was kept small, which led to the generation of high quality (low energy spread) e-beams by minimizing the beam loading effect on the wake. The analysis of the stable half-GeV beam regime showed the requirements for stable self injection and acceleration. A small change of discharge delay t dsc , and input energy E in , significantly affected performance.The statistical analysis provided information for future optimization, and suggested possible schemes for improvment of the stability and higher quality beam generation. A CDG-LWFA is envisioned as a construction block for the next generation accelerator, enabling significant cost and size reductions.

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“…12 Recently, an effective target design basing on a plasma hollow channel has been employed to accelerate and collimate the energetic electron beams. [13][14][15][16][17][18][19][20] More recently, Renard-Le Galloudec et al 21 and Zhang et al 22 demonstrate that the hot electrons can be efficiently guided, transported, and localized when a funnel is attached to a conical target.…”

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confidence: 99%

Enhanced long-distance transport of periodic electron beams in an advanced double layer cone-channel target

Duan

Zhou

et al. 2018

AIP Advances

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An enhanced long-distance transport of periodic electron beams in an advanced double layer cone-channel target is investigated using two-dimensional particle-in-cell simulations. The target consists of a cone attached to a double-layer hollow channel with a near-critical-density inner layer. The periodic electron beams are generated by the combination of ponderomotive force and longitudinal laser electric field. Then a stable electron propagation is achieved in the double-layer channel over a much longer distance without evident divergency, compared with a normal cone-channel target. Detailed simulations show that the much better long-distance collimation and guidance of energetic electrons is attributed to the much stronger electromagnetic fields at the inner wall surfaces. Furthermore, a continuous electron acceleration is obtained by the more intense laser electric fields and extended electron acceleration length in the channel. Our investigation shows that by employing this advanced target, both the forward-going electron energy flux in the channel and the energy coupling efficiency from laser to electrons are about threefold increased in comparison with the normal case.

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Observation of strong correlation between quasimonoenergetic electron beam generation by laser wakefield and laser guiding inside a preplasma cavity

Cited by 85 publications

References 36 publications

Self-Guided Wakefield Experiments Driven by Petawatt-Class Ultrashort Laser Pulses

Self-Guided Wakefield Experiments Driven by Petawatt-Class Ultrashort Laser Pulses

Control of Laser Plasma Based Accelerators up to 1 GeV

Enhanced long-distance transport of periodic electron beams in an advanced double layer cone-channel target

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