Speaker
Florian-Emanuel Brack
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.2036.pdf
Pulsed High-Field Magnets for laser-driven Ion Beam Shaping and
Laboratory Astrophysics
Florian-Emanuel Brack1,2, Florian Kroll1,2, Josefine Metzkes-Ng1, Lieselotte Obst1,2, Stephan
Kraft1, Martin Rehwald1,2, Hans-Peter Schlenvoigt1, Leonhard Karsch1,3, Jörg Pawelke1,3,
Sergei Zherlitsyn1, Thomas Herrmansdörfer1, Karl Zeil1, Ulrich Schramm1
1
Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
2
Technische Universität Dresden, Germany
3
OncoRay - National Center for Radiation Research in Oncology
Pulsed high-field magnets have become a common, versatile research tool. We present a pulsed
magnet technology platform that opens up new areas of application in the field of laser-driven
plasma physics. Compact high-field magnets, generating ms-long magnetic field pulses with
amplitudes ranging as high as 20 T, have been developed for operation under high vacuum and
in close vicinity to the harsh laser-plasma environment. The combination of the presented
magnet technology and portable pulsed power systems paves the way for novel experiments in
laboratory astrophysics and enables unique studies on beam optics for laser-driven ion sources.
We implemented a pulsed beamline at the Dresden laser acceleration source Draco consisting
of two pulsed solenoids for shaping laser-accelerated ion beams spatially and spectrally for
application. The bunches remain intense, leading to high dose rates when stopped in matter.
These dose rates make special demands for dosimetry and are of major interest for
radiobiological studies. We performed experiments with the PW beam of Draco to investigate
the feasibility of worldwide first controlled volumetric in vivo tumour irradiations in a
dedicated mouse model with laser-accelerated protons. The study shows the reliable generation
of homogeneous dose distributions laterally and in depth. Practical issues, like magnet
repetition rate and stability, mean dose rate and future radiobiological challenges will be
discussed and an outlook on the volumetric tumour irradiation experiments will be given.
Furthermore, a split-pair coil was developed that can be used for the investigation of
magnetized plasma in the frame laboratory astrophysical phenomena. The magnet provides
optical access to the magnetized laser-driven plasma via two bores perpendicular to the coil
axis. These openings enable optical and X-ray probing as well as insertion of obstacles and/or
laser targets.
