The workshop is organized by ILL-CZ research infrastructure to support and advertise neutron techniques within high pressure community.
Three invited speakers will focus on modern techniques related to soft-matter, hard-matter, magnetism and superconductivity.
Afterwards there will be place for several Flash presentations, where every attendee can shortly (5 minutes strict!) introduce his/her research.
At the end of the event there will be small evening refreshment where you can discuss with speakers and other colleagues.
The meeting will start immediately after the closure of afternoon sessions of EHPRG 2019 conference, within the conference venue (Hotel Duo, room Prague West). The meeting is open for the whole scientific community free of charge.
17 : 05
Over the last decade, the Service for Advanced Neutron Environments (SANE) of the Institut Laue Langevin developed in collaboration with scientists new high hydrostatic pressure equipment, which can be used for samples in solution. It is conceived in a way that it can be easily transported and used on all spectrometers and the diffractometer D16. The different parts of the equipment will be presented: the various cells, the high pressure controller and newly developped sample sticks. Finally an example of application on a biological sample will be presented.
17 : 25
Neutron Larmor diffraction (LD) is a high-resolution technique which permits the measurement of lattice spacings and their distribution. The latter arises, for example, from micro-strains, magnetostriction, structural and magnetic domains, or from a small splitting of Bragg peaks, resulting from distortions of the crystal lattice. In addition, spin correlation lengths in antiferromagnets and antiferromagnetic domain sizes of up to 1 μm can be determined with high accuracy. The resolution of current Larmor diffractometers is 10-6 (relative) for the lattice spacing and one order of magnitude less for the distribution width. One of the main applications of LD is the measurement of thermal expansion under extreme conditions, such as high pressure and low (or high) temperatures. In this introductory talk I will review the strengths and limits of Larmor diffraction and show examples of typical experiments.
17 : 45 - 18 : 00
18 : 00
When a neutron enters a magnetic field, its magnetic moment undergoes Larmor precession. Neutron depolarization imaging (NDI) can thus probe ferromagnetic domains, magnetic islands in spin glasses, or the Meissner field outside a superconductor. Neutrons easily penetrate cryogenic equipment, pressure cells and bulk metal samples, making NDI a great technique to investigate these different phenomenon under extreme conditions. In order to overcome the poor resolution and counting statistics intrinsic to NDI, we have enhanced it by using focusing neutron supermirror guides. These guides increase the neutron flux by 40 times in a small beam section of less than 1 mm diameter. By placing the sample space of our custom built diamond anvil cell at the focal spot of the neutron optics, we are able to measure neutron depolarization at unprecedented pressures.
18 : 20 - 19 : 00
Place for your Flash presentations, where every attendee can shortly (5 minutes max!) introduce his/her research/lab/technique. Slots are assigned on a first-come, first-served basis. Please let us know by e-mail if you are interrested!