MAT science Week

The facility for antiproton and ion research (FAIR) will provide a unique accelerator complex with heavy ion beams up to 10GeV/u and highest intensities. Besides the existing target stations dedicated to materials research (M-branch, X0, and Cave A) two new target stations in the APPA Cave and at CRYRING are planned and under commissioning respectively. The future APPA cave hosts the high...

It is now possible to acquire a “compact light source”, CLS, which delivers hard x-rays with a brilliance similar to 3rd generation synchrotrons. The CLS is based on a miniature electron storage ring, in combination with a picosecond laser, where the laser pulse stored in a high-finesse optical cavity acts as an “undulator” to produce x-rays. Such a CLS can be built to have a brightness of 4 x...

In 2017 s newly developed superconducting 15-gap RF-accelerator cavity has been successfully tested at GSI . After a short commissioning and ramp up time of some days, a Crossbar H-cavity accelerated first time heavy ion beams with full transmission up to the design beam energy of 1.85 MeV/u. The design acceleration gain of 3.5 MV inside a length of less than 70 cm has been verified with heavy...

High energy proton microscopy (HEPM) or radiography is a novel technique for probing the interior of dense objects in static or dynamic experiments by mono-energetic beams of GeV-energy protons. A special system of magnetic lenses is employed for imaging and aberrations correction. Using this technique, one can measure the areal density distribution of a thick sample with sub-percent accuracy,...

Intense beams of energetic heavy ions offer a novel path towards volumetric heating of dense millimeter-sized targets. In the APPA cave at the future FAIR facility these capabilities will be exploited to study matter at extreme conditions and dense strongly-coupled plasmas. The talk will give a short introduction to the planned experimental facilities and platforms, as well as examples of...

The slowing down of swift heavy ions in matter leads to the deposition of enormous energy to the electrons of a given target of the order of 1022 W/cm3. This presentation provides an overview of the present knowledge of ion tracks and material modifications induced by swift heavy ions of MeV to GeV energy. Track formation requires a critical energy loss threshold and shows a clear dependence...

Recent advances in the design of diamond anvil cells and techniques for reaching extremely high pressures and temperatures have been combined with irradiations using swift heavy ions. These relativistic ions provide a unique opportunity to access states of matter quite far from thermodynamic equilibrium [1]. Each projectile deposits exceptional amounts of kinetic energy (GeV) within an...

In this talk I will give an introductory review of high pressure devices covering pressures in the range 0.1-100 GPa (1 kbar-1 Mbar) and corresponding sample volumes of approximately 10^4-10^-3 mm^3. I will illustrate typical applications of these devices in material research, in particular at large-scale user facilities, and discuss advantages and their limitations. If there is time,...

Time-resolved and pump and probe experiments using pulsed-laser heating and the diamond anvil cell technique have recently shown that they can yield information on transport properties of matter [1] as well as they can create and probe warm dense matter [2]. Time-resolved temperature response of an iron sample has been measured in order to provide thermal conductivity constraints in the...

An equations of state for solids is formulated with the correct behavior at very under strong compression and for wide ranges of temperature at first for "regular" solid. Modifications for solid with electronic configuration crossing are discussed and the formulation of a coherent equation of state for the fluid phase is illustrated for argon and water under very strong compression.

The energy loss maximum (Bragg peak) at their end of range is a characteristic feature of ions stopping in matter, which causes an acoustic pulse, if ions are deposited in short-enough bunches. This *ionoacoustic effect* has been studied for decades now, mainly for astrophysical applications, and has recently found renewed interest in proton therapy for range measurements in tissue. Within...

Radiation damage processes generate acoustic emission (AE) due to defect avalanches. Avalanche processes have been heavily researched (review Salje and Dahmen, 2014) in recent years. The initiation of avalanches is achieved by standing acoustic waves (Baro et al. 2013), stress, strain, electric fields and were demonstrated to be reproduced by computer simulations (Salje et al. 2017). Internal...

The influence of natural radiation on luminescence behaviour of calcite leads to the assumption that it might be possible to determine the defect concentration, and therefore, the fluence applied to irradiated calcite crystals, by measuring the intensity change of the luminescence peaks. A new mobile UV-C laser excited fluorescence spectrometer system was build to be used at different...

The characterization of swift heavy ion induced latent tracks morphology in various materials allows one to see general trends and plays an important role for correct understanding of material damage process due to high density electronic excitations. To date, a number of direct and indirect methods (such as TEM, RBS/c, XRD, SAXS, AFM) have been used to evaluate latent track parameters...

Sapphire is a common substrate for a broad variety of materials due to its optical transparency, insulating property and its hexagonal structure allowing often an easy epitaxial growth. During the use in radiative environment, such as space or nuclear industry, the materials intrinsic properties can be modified. Indeed, investigating the behavior of sapphire substrate under ion irradiation and...

Complex organic molecules (COMs) have been detected in outer space [1]. The carbonaceous meteorites found on earth containing traces of nucleobases (i.e. adenine, guanine etc.) also indicate towards their presence in outer space. The later is permeated by ionizing radiations, therefore, COMs constantly suffer irradiation. Survival of COMs depends on their radio-resistance, and measurements of...

The nitride semiconductors, (Ga,In)N, which display optical and electronic properties, intend to become one of the next-generation technology for space exploration [1]. Such application requires studying the behavior of these materials under cosmic radiation, hence InN and GaN specimens were irradiated at the GANIL facility with 950 MeV Pb and 1,4 GeV U. These structural and chemical changes...

In heavy-ion accelerators such as the heavy ion synchrotron SIS18 at GSI, charge exchanged lost beam ions stimulate the release of gas from the chamber walls and the subsequent pressure increase leads to increased or even complete beam-loss. Consequently heavy ion-induced desorption is an issue for next-generation heavy ion accelerators with highest beam intensities. To come up against...

Polycrystalline graphite (PG) is one of the best candidate materials for applications in extreme radiation environments. It exhibits superior thermo-mechanical properties, resistance to elevated temperatures and stresses, low density leading to low linear energy transfer and reduced beam-induced activation. Recent studies report on ion beam induced hardening and increased electrical resistance...

The most promising materials for operation under high fluxes of high-energetic irradiations are complex heterogeneous systems strengthened by nanoscale inclusions and phases. Energy loses in such structures is nontrivial. Objects of this study are two titanium alloys (Ti-5Al-4V-2Vr and Ti-6Al-4V) and ODS Eurofer steel. The effect of irradiation at room temperature on the microstructure was...

Classical FLASH technology shows limited radiation tolerance making it sensible to radiation induced errors, e.g., single event upsets. Charge based memories are becoming more and more sensitive to radiation with further downscaling leading to a lack of radiation hard memories beyond Mbit storage capacities. There is, thus, great demand for new intrinsically radiation hard NVM technologies....

The Laboratório de Instrumentação e Física Experimental de Partículas (LIP) is the reference institution for experimental particle physics and associated technologies in Portugal. It was created in May 1986 to exploit the unique opportunities created by the country’s accession to CERN. In the last ten years an R&D line focused on the study of Space radiation environments and their effects was...