58 research outputs found
A 31T split-pair pulsed magnet for single crystal x-ray diffraction at low temperature
We have developed a pulsed magnet system with panoramic access for
synchrotron x-ray diffraction in magnetic fields up to 31T and at low
temperature down to 1.5 K. The apparatus consists of a split-pair magnet, a
liquid nitrogen bath to cool the pulsed coil, and a helium cryostat allowing
sample temperatures from 1.5 up to 250 K. Using a 1.15MJ mobile generator,
magnetic field pulses of 60 ms length were generated in the magnet, with a rise
time of 16.5 ms and a repetition rate of 2 pulses/hour at 31 T. The setup was
validated for single crystal diffraction on the ESRF beamline ID06
Dichotomy between the hole and electrons behavior in the multiband FeSe probed by ultra high magnetic fields
Magnetoresistivity \r{ho}xx and Hall resistivity \r{ho}xy in ultra high
magnetic fields up to 88T are measured down to 0.15K to clarify the multiband
electronic structure in high-quality single crystals of superconducting FeSe.
At low temperatures and high fields we observe quantum oscillations in both
resistivity and Hall effect, confirming the multiband Fermi surface with small
volumes. We propose a novel and independent approach to identify the sign of
corresponding cyclotron orbit in a compensated metal from magnetotransport
measurements. The observed significant differences in the relative amplitudes
of the quantum oscillations between the \r{ho}xx and \r{ho}xy components,
together with the positive sign of the high-field \r{ho}xy , reveal that the
largest pocket should correspond to the hole band. The low-field
magnetotransport data in the normal state suggest that, in addition to one hole
and one almost compensated electron bands, the orthorhombic phase of FeSe
exhibits an additional tiny electron pocket with a high mobility.Comment: Latex, 4 pages (2 figures, 1 table), and supplemental materia
High frequency magnetic oscillations of the organic metal -(ET)ZnBr(CHCl) in pulsed magnetic field of up to 81 T
De Haas-van Alphen oscillations of the organic metal
-(ET)ZnBr(CHCl) are studied in pulsed magnetic
fields up to 81 T. The long decay time of the pulse allows determining reliable
field-dependent amplitudes of Fourier components with frequencies up to several
kiloteslas. The Fourier spectrum is in agreement with the model of a linear
chain of coupled orbits. In this model, all the observed frequencies are linear
combinations of the frequency linked to the basic orbit and to the
magnetic-breakdown orbit .Comment: 6 pages, 4 figure
Investigating particle acceleration dynamics in interpenetrating magnetized collisionless super-critical shocks
Colliding collisionless shocks appear in a great variety of astrophysical
phenomena and are thought to be possible sources of particle acceleration in
the Universe. We have previously investigated particle acceleration induced by
single super-critical shocks (whose magnetosonic Mach number is higher than the
critical value of 2.7) (Yao et al. 2021, 2022), as well as the collision of two
sub-critical shocks (Fazzini et al. 2022). Here, we propose to make
measurements of accelerated particles from interpenetrating super-critical
shocks to observe the ''phase-locking effect'' (Fazzini et al. 2022) from such
an event. This effect is predicted to significantly boost the energy spectrum
of the energized ions compared to a single supercritical collisionless shock.
We thus anticipate that the results obtained in the proposed experiment could
have a significant impact on our understanding of one type of primary source
(acceleration of thermal ions as opposed to secondary acceleration mechanisms
of already energetic ions) of ion energization of particles in the Universe
Dynamics of nanosecond laser pulse propagation and of associated instabilities in a magnetized underdense plasma
The propagation and energy coupling of intense laser beams in plasmas are
critical issues in laser-driven inertial confinement fusion. Applying magnetic
fields to such a setup has been evoked to enhance fuel confinement and heating,
and mitigate laser energy losses. Here we report on experimental measurements
demonstrating improved transmission and increased smoothing of a high-power
laser beam propagating in an underdense magnetized plasma. We also measure
enhanced backscattering, which our simulations show is due to hot electrons
confinement, thus leading to reduced target preheating
Detailed characterization of laser-produced astrophysically-relevant jets formed via a poloidal magnetic nozzle
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