Thermal issues for the optical transition radiation screen for the ELI-NP compton gamma source

A high brightness electron LINAC is being built in the Compton Gamma Source at the ELI Nuclear Physics facility in Romania. To achieve the design luminosity, a train of 32 bunches, 16 ns spaced, with a nominal charge of 250 pC will collide with a laser beam in two interaction points. Electron beam spot size is measured with Optical Transition Radiation (OTR) profile monitors. In order to measure the beam properties, the OTR screens must sustain the thermal and mechanical stress due to the energy deposited by bunches. This paper is an ANSYS study of the issues due to the high energy transferred to the OTR screens. Thermal multicycle analysis will be shown; each analysis will be followed by a structural analysis in order to investigate the performance of the materia

Delivery status of the ELI-NP gamma beam system

International audienceThe ELI-NP GBS is a high intensity and monochromatic gamma source under construction in Magurele (Romania). The design and construction of the Gamma Beam System complex as well as the integration of the technical plants and the commissioning of the overall facility, was awarded to the Eurogammas Consortium in March 2014. The delivery of the facility has been planned in for 4 stages and the first one was fulfilled in October 31st 2015. The engineering aspects related to the delivery stage 1 are presented

Erratum to: EuPRAXIA Conceptual Design Report – Eur. Phys. J. Special Topics 229, 3675-4284 (2020), https://doi.org/10.1140/epjst/e2020-000127-8

International audienceThe online version of the original article can be found at http://https://doi.org/10.1140/epjst/e2020-000127-8</A

Stabilità dimensionale di materiali compositi in ambiente spaziale

Stress termic

Process for production high-modulus carbon fiber pitch-based

Processo di produzione di fibre di carbonio da pitch. La rilevanza è NAZIONAL

Plasma sputtered oxide films on hybrid captive device for reusable TPS for re-entry systems

A reusable Thermal protection system has to satisfy several specific requirements. One of the most critical is the control of the oxidation of the materials during the re-entry step. This result may be reached through a proper balance between bulk materials with good mechanical properties and coatings with good thermal barrier properties. Carbon composites (SiC) are nowadays the most suitable candidates as they have both good thermal resistance and good thermal stability which preserve the mechanical properties at high temperatures. However a further improvement is needed: The development of a coating which allows to optimize both the oxidation protection and the substrate adhesion. Plasma sputtered oxide films of valve-metals (Ta, Nb, Zr, Ti) deposited on hybrid captive device are proposed in this study as a possible solution to the above-mentioned specifications. The exposed experimental findings refer to Zr02 nanostructured thin films deposited in a RF (13.56MHz) magnetron sputtering reactor, starting from Zr targets (purity 99,99%) in plasma fed with Ar and 02 in different experimental conditions. After the deposition, some specimens were submitted to annealing performed for 5 min in air at different temperatures in the range 600-900 °C in order to increase grain growth. Chemical and morphological characterization of deposited film was carried out by means of a Field Emission Scanning Electron Microscopy (Supra40 Zeiss Microscope) equipped with an Energy Disperse Spectrometer. In addition on Carbon/Carbon composite samples, as received and coated, dilatometric characterizations have been performed. Copyright © (2012) by the International Astronautical Federation