Veranstaltungsarchiv

Institutsseminar

Titel

Institutsseminar

Beschreibung

Broken plasma wake fields in homogeneous plasmas provide a feasible path for high gradient particle acceleration. Especially efficient are the so called bubble regime of laser-plasma wake fields [1] and the blow out regime of particle wake field acceleration. For the laser driven case, the pulse is shorter than the plasma wavelength and fits perfectly into the first half of the plasma period. The laser intensity is thought to be high enough that the created wake field breaks after its first oscillation. In this regime, the wake field – or bubble – takes the form of a distorted spherical cavity from which all electrons are banished. The bubble moves with nearly the speed of light through the plasma and generates quasi-monoenergetic electron bunches.

All former discussions about tailored plasmas in the context of electron acceleration target the guiding of relativistic laser pulses and their diffraction. At present, plasma channels are used to gain additional control over the plasma wake field. In a recent work Pukhov et al. [4] showed that (i) self-injection can be suppressed and that (ii) the focusing force inside the bubble can entirely be removed. This circumstance brings up the question, if the plasma channel can be used to manipulate the structure of an externally injected electron beam in a bubble. To discuss this, recently a semi-analytical model for interacting electrons in the bubble regime has been introduced [5]. Different to PIC simulations, this model treats interacting electrons as point-like physical particles.

[1] A. Pukhov, J. Meyer-ter-Vehn, Applied Physics B 74, 355 (2002)
[2] O. Jansen, T. Tückmantel, and A. Pukhov, Eur. Phys. J. Special Topics 223, 1017–1030 (2014)
[3] J. Thomas, A. Pukhov, and I.Y. Kostyukov, Laser and Particle Beams 32(02), 277-284 (2014)
[4] A. Pukhov, O. Jansen, T. Tueckmantel, J. Thomas, and I.Y. Kostyukov, PRL 113, 245003 (2014)
[5] J. Thomas, M. M. Günther, and A. Pukhov, arXiv:1404.3576 (2014)
[6] S. Hillenbrand, R. Assmann, A.S. Müller, O. Jansen, V. Judin, and A. Pukhov, Nuclear Instruments A 740, 153-157 (2014)
[7] J. Thomas, I. Y. Kostyukov, J. Pronold, A. Golovanov, and A. Pukhov, arXiv:1510.09012 (2014)

Ort

Seminarraum HI-Jena, Fröbelstieg 3

Datum (Start der Veranstaltung)

20.01.2016