While unbounded collective human mind continues to push beyond the boundaries in uncovering myriad mysteries of our universe, highly performing particle accelerators become indispensable tool to conduct successful experiments to shed light on such fundamental scientific inquires. On the path towards more efficient and sustainable particle accelerators, overcoming performance bottleneck of the...
The microstructural characterization represents an essential aspect for helping the enhancement of the material superconducting properties. Within the huge CERN project related to the realization of the FCC-hh, we focused on the microstructural analysis of superconducting materials envisioned as suitable candidates for some of its fundamental components: Nb3Sn for the bending...
The niobium-coated copper cavities are interesting candidates for replacing bulk niobium cavities in future facilities (e.g. FCC). Such cavities, ideally, should overcome some accelerator design problems related to bulk Nb cavities. However, Nb/Cu films tend to show more extreme “Q-slope” effect, and have other disadvantages compared to bulk-Nb cavities, which currently limit their application...
This work will provide an insight into the CERN R&D programme on superconducting thin films. The aim is to find coating techniques and/or new materials with enhanced RF performance applicable to SRF cavities. The main lines of research at CERN consist of Nb on Cu technology, historically used in our accelerators, and A15 on Cu, to find new superconducting materials with potential application...
In this work, an alternative method to compute the effect of losses on superconductors based on the Lossy Transmission Line Theory is introduced rigorously. In contrast to the application of the well-known perturbative methods at the dielectric-superconductor interface to obtain the equivalent surface currents, this new approach lies in analyzing the decaying propagative waves along the...
One of the well-known difficulties concerning the performances of the Nb coated Cu cavities, is the reproducibility of the results. Two cavities fabricated by the same method and sputtered with the same deposition parameters, may present different performances during the RF characterization. Two main approaches are taken into consideration for this research: substrate and film reproducibility....
The Magnesium Diboride (MgB2), is a material known since early 1950's, but, whose superconducting (SC) properties were defined in 2001, positioning this as a High-Temperature superconductor material (Tc= 39-40 K). The absence of weak-link and the simple crystalline structure allows to produce wires using the powder in tube (PIT) technique, allowing the industrial development and application....
Transition edge sensors (TES) play a key role in current projects of future X-rays space
telescopes as are foreseen as detectors for the focal plane instrument. In order to full exploit
their sensitivity in the space environment, they need an active cryogenic anticoincidence
detector (CryoAC) to reject the background due to cosmic charged particles. As signal given by
the interaction of...
The first step towards high critical currents in Bi-2212 wires was the comprehension that the supercurrent is blocked over long lengths by filament-diameter bubbles growing from the porosity of the powders during the partial melting phase. The Over Pressure (OP) process led to the realization of dense Bi-2212 wires with a $J_E$ performance far beyond the minimum application requirements, but...
