Electron self-injection into the phase of a wake excited by a driver laser in a nonuniform density target

Yu, Q.; Gu, Y. J.; Li, X. F.; Huang, S.; Kong, Q.; Kawata, S.
July 2015
Physics of Plasmas;2015, Vol. 22 Issue 7, p1
Academic Journal
It is well known that if electrons are externally injected into a density upramp, then their dephasing lengths will be extended greatly, and thus these electrons will gain more energy. However, we find that a density upramp can also be used to control the beam's collimation and the emittance that occurs by self-injection in the gradient. When electrons self-inject into the wakefield in a density gradient, an electron filtering mechanism is found to occur in the injection process. Electrons with high transverse velocities are scattered and only electrons with high longitudinal to transverse velocity ratios can be candidate electrons for self-injection. This causes the trapped electrons to be more highly collimated. In addition, the injection occurs near the axis, which causes the accelerated electron beam to have reduced emittance. An ultra-collimated electron beam with an angle spread of ~1 and emittance of ~0.01 mmmrad is generated by a 2.5-dimensional particle-in-cell (2.5-D PIC) simulation.


Related Articles

  • Studies of a low-impedance coaxial split-cavity oscillator. Wenyuan Yang; Wu Ding // Physics of Plasmas;Jun2005, Vol. 12 Issue 6, p063105 

    A low-impedance coaxial split-cavity oscillator (SCO) for high output power is proposed and studied by simulation in this paper. By using the coaxial structure, the space-charge limiting current can be improved markedly, and thus more intense electron beams can be used for microwave generation....

  • Space Charge Simulations of First-Turn Experiments on the University of Maryland Electron Ring (UMER). Kishek, R. A.; Bernal, S.; Cui, Y.; Godlove, T. F.; Haber, I.; Harris, J.; Huo, Y.; Li, H.; O'Shea, P. G.; Quinn, B.; Reiser, M.; Walter, M.; Zou, Y. // AIP Conference Proceedings;2005, Vol. 773 Issue 1, p147 

    Emerging particle accelerators require beam brightness and intensity surpassing traditional limits, bringing beams into the realm of nonneutral plasmas where particles interact primarily via long-range collective forces. Therefore the understanding of collective interactions is crucial for...

  • Observations of low-aberration plasma lens focusing of relativistic electron beams at the underdense threshold. Thompson, M. C.; Badakov, H.; Rosenzweig, J. B.; Travish, G.; Barov, N.; Piot, P.; Fliller, R.; Kazakevich, G. M.; Santucci, J.; Li, J.; Tikhoplav, R. // Physics of Plasmas;Jul2010, Vol. 17 Issue 7, p073105 

    Focusing of a 15 MeV electron bunch by a plasma lens operated at the threshold of the underdense regime has been demonstrated. The strong, 1.7 cm focal length, plasma lens focused both transverse directions simultaneously and reduced the minimum area of the beam spot by a factor of 23. It is...

  • Simulation of the temperature field in the surface layer under pulsed electron-beam heating. Gruzdev, V.; Zalesskii, V.; Rugol’, D. // Journal of Engineering Physics & Thermophysics;Mar2007, Vol. 80 Issue 2, p231 

    This paper presents the results of the numerical simulation of the temperature field in single-and double-layer materials under electron-beam heating in stationary and pulsed modes and analyzes the conditions under which control of the heat-treated-layer parameters by varying the duration, the...

  • Status of UCLA Helical Permanent-Magnet Inverse Free Electron Laser. Knyazik, A.; Tikhoplav, R.; Frederico, J. T.; Affolter, M.; Rosenzweig, J. B. // AIP Conference Proceedings;1/22/2008, Vol. 1086 Issue 1, p485 

    A helical undulator, utilizing permanent-magnet of cylindrically symmetric (Halbach) geometry is being developed at UCLA’s Neptune Facility. The initial prototype is a short 10 cm, 7 periods long helical undulator, designed to test the electron-photon coupling by observing the...

  • Transmission of ∼10 keV electron beams through thin ceramic foils: Measurements and Monte Carlo simulations of electron energy distribution functions. Morozov, A.; Heindl, T.; Skrobol, C.; Wieser, J.; Krücken, R.; Ulrich, A. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Dec2008, Vol. 48 Issue 3, p383 

    Electron beams with particle energy of ~10 keV were sent through 300 nm thick ceramic (Si3N4 + SiO2) foils and the resulting electron energy distribution functions were recorded using a retarding grid technique. The results are compared with Monte Carlo simulations performed with two publicly...

  • Simulations of electron transport and ignition for direct-drive fast-ignition targets. Solodov, A. A.; Anderson, K. S.; Betti, R.; Gotcheva, V.; Myatt, J.; Delettrez, J. A.; Skupsky, S.; Theobald, W.; Stoeckl, C. // Physics of Plasmas;11/1/2008, Vol. 15 Issue 11, p112702 

    The performance of high-gain, fast-ignition fusion targets is investigated using one-dimensional hydrodynamic simulations of implosion and two-dimensional (2D) hybrid fluid-particle simulations of hot-electron transport, ignition, and burn. The 2D/3D hybrid-particle-in-cell code LSP [D. R. Welch...

  • Acceleration and guiding of fast electrons by a nanobrush target. Zhao, Zongqing; Cao, Lihua; Cao, Leifeng; Wang, Jian; Huang, Wenzhong; Jiang, Wei; He, Yingling; Wu, Yuchi; Zhu, Bin; Dong, Kegong; Ding, Yongkun; Zhang, Baohan; Gu, Yuqiu; Yu, M. Y.; He, X. T. // Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p123108 

    Laser interaction with a nanobrush target plasma is investigated at the SILEX-I laser facility [X. F. Wei et al., J. Phys. Conf. Ser. 112, 032010 (2008)] with a laser of intensity 7.9×1018 W/cm2. Highly collimated fast electron beams with yields of more than three times higher than that from...

  • Self-mode-transition from laser wakefield accelerator to plasma wakefield accelerator of laser-driven plasma-based electron acceleration. Pae, K. H.; Choi, I. W.; Lee, J. // Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p123104 

    Via three-dimensional particle-in-cell simulations, the self-mode-transition of a laser-driven electron acceleration from laser wakefield to plasma-wakefield acceleration is studied. In laser wakefield accelerator (LWFA) mode, an intense laser pulse creates a large amplitude wakefield resulting...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics