Quasi-monoenergetic electron beam generation during laser pulse interaction with very low density plasmas

Yamazaki, A.; Kotaki, Hajime; Daito, I.; Kando, M.; Bulanov, S. V.; Esirkepov, T. Zh.; Kondo, Shuji; Kanazawa, Shuhei; Homma, Takayuki; Nakajima, Kazuhisa; Oishi, Yuji; Nayuki, Takuya; Fujii, Takashi; Nemoto, Koshichi

doi:10.1063/1.2017842

Cited by 71 publications

(29 citation statements)

References 20 publications

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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 Experimentssupporting

confidence: 54%

“…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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Section: Plasma Based Accelerator Experimentssupporting

confidence: 54%

Section: Spectrometer Designmentioning

confidence: 99%

Control of Laser Plasma Based Accelerators up to 1 GeV

Nakamura

2007

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“…(9,12,13,15,17) we obtain for the matrix ij a components a system of ordinary differential equations ( ) ( ) 2 33 0 22 22 2 2 22 33 22 33 4 , Properties of this equation system are discussed in detail in Ref. [40].…”

Section: Equilibrium and Betatron Oscillations Of A Transversally Elomentioning

confidence: 99%

“…For example, properties of the transverse wake wave-breaking [21] have been used in Refs. [4,15,22] in order to explain nonlinear wake evolution and electron acceleration in homogeneous and inhomogeneous plasmas. In addition, longitudinal breaking was invoked to describe electron self-injection in homogeneous plasmas [23,24], and the controllable electron injection regimes in plasmas with a tailored density profile [25].…”

Section: Introductionmentioning

confidence: 99%

“…The energy spectrum is a quasimono-energetic form [4][5][6][7]15], which is mainly related to the fact that fast electrons reach the maximum energy and are localized at the top of the separatrix in the x,p x phase plane [16][17][18]. We remark two properties of LWFA ejected relativistic electrons: a) the product of the bunch length and the energy spread, the longitudinal emittance, is comparable to conventional RF sources (in the range of MeV-ps), while the very short bunch length is achieved even without bunch compression, and b) the micron-size transverse spot of the initial electron bunch corresponds to the laser spot size, which in turn may lead to a small transverse emittance.…”

Section: Introductionmentioning

confidence: 99%

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On the Production of Flat Electron Bunches for Laser Wake Field Acceleration

Fukuda¹,

H²,

Koga³

et al. 2006

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We suggest a novel method for injection of electrons into the acceleration phase of particle accelerators, producing low emittance beams appropriate even for the demanding high energy Linear Collider specifications. In this paper we work out the injection into the acceleration phase of the wake field in a plasma behind a high intensity laser pulse, taking advantage of the laser polarization and focusing. With the aid of catastrophe theory we categorize the injection dynamics. The scheme uses the structurally stable regime of transverse wake wave breaking, when electron trajectory self-intersection leads to the formation of a flat electron bunch. As shown in threedimensional particle-in-cell simulations of the interaction of a laser pulse in a linefocus with an underdense plasma, the electrons, injected via the transverse wake wave breaking and accelerated by the wake wave, perform betatron oscillations with different amplitudes and frequencies along the two transverse coordinates. The polarization and focusing geometry lead to a way to produce relativistic electron bunches with asymmetric emittance (flat beam). An approach for generating flat laser accelerated ion beams is briefly discussed. † Also at A. M. Prokhorov

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