Controlled Electron-Beam Injection into Plasma Waves for Tailored Betatron-Radiation Generation

Principal Investigator:
Jens Osterhoff

Deutsches Elektronen-Synchrotron (DESY), Hamburg

Local Project ID:

HPC Platform used:

Date published:

The acceleration of charged particles in strong plasma wakes, a potential alternative technology, which is orders-of-magnitude more compact than standard accelerators, has seen remarkable progress both in experiment and theory in recent years. Nowadays, acceleration gradients of more than 10 GV/m can be readily achieved using either ultra-short and intense laser pulses [1] or particle beams as wake drivers [2]. With the demonstration of first GeV electron beams from laser-plasma accelerators [3] and a general trend towards higher reproducibility [4] and improved control [5-7] over the involved plasma processes, plasma-acceleration techniques are starting to draw considerable interest and are raising hopes for their use in user-facility environments in the not too distant future, e.g. at photon sources [8] and eventually in high-energy particle colliders [9].

The studies of a team of scientists from DESY, Hamburg (Germany), and IST, Lisbon (Portugal), concentrate on the controlled injection of few-femtosecond, phase-space-tailored electron bunches into a plasma wakefield. This is achieved by means of external injection of conventionally accelerated electron beams or by controlled-injection techniques (e.g. [10]). In contrast to common wakefield methods relying on electron self-injection, these sophisticated processes allow for a controlled and tailored population of 6D phase space in such a way that electron bunches may be forced to undergo controlled transverse betatron oscillations inside the strongly focussing transverse plasma fields. These oscillations are the source of synchrotron radiation (betatron radiation), which is of interest for applications in phase-contrast imaging [11], the structural investigation of biological samples [12], and material science. In addition, controlled external injection is of high importance and directly linked to the staging of multiple acceleration modules in series [13] with the goal of applications at the energy frontier.

This phenomenologically rich field of physics at the intersection of relativistic laser, plasma, and accelerator science can only be captured and theoretically fully understood by means of computationally highly demanding particle-in-cell codes. The research team is utilising the code OSIRIS [14]. OSIRIS is a state-of-the-art massively parallel particle-in-cell code highly optimised for a wide range of architectures.


Project members:
Jens Osterhoff1 (PI), Alberto Martinez de la Ossa1, Julia Grebenyuk1, Timon Mehrling1, Jorge Vieira2, Joana L. Martins2, Ricardo A. Fonseca2, Luís O. Silva2
1Deutsches Elektronen-Synchrotron DESY, Hamburg (Germany)
2Instituto Superior Técnico, Universidade Técnica de Lisboa (Portugal)


[1] Tajima and Dawson, Phys. Rev. Lett. 43, 267 (1979) [2] Blumenfeld et al., Nature 445, 741 (2007)
[3] Leemans et al., Nat. Phys. 2, 696 (2006)
[4] Osterhoff et al., Phys. Rev. Lett. 101, 085002 (2008) [5] Faure et al., Nature 444, 737 (2006)
[6] Popp et al., Phys. Rev. Lett. 105, 215001 (2009) [7] Gonsalves et al., Nat. Phys. 7, 862 (2011)
[8] Fuchs et al., Nat. Phys. 5, 826 (2009)
[9] Schroeder et al., Phys. Rev. STAB 13, 101301 (2010)
[10] Martinez de la Ossa et al., Phys. Rev. Lett. 111, 245003 (2013) [11] Momose et al., Nat. Med. 2, 473 (1996)
[12] Solem, J. Opt. Soc. Am. B 3, 1551 (1986)
[13] Mehrling et al., Phys. Rev. STAB 15, 111303 (2012)

Scientific Contact:

Dr. Jens Osterhoff
Deutsches Elektronen-Synchrotron DESY
Geb. 1e/O2.516
Notkestr. 85
22607 Hamburg, Germany
e-mail: jens.osterhoff@desy.de
Web: plasma.desy.de

Tags: DESY, Hamburg EPP