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Condens. Matter 2017, 2(2), 18; doi:10.3390/condmat2020018

Materials and Breakdown Phenomena: Heterogeneous Molybdenum Metallic Films

1
Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascati 00044, Italy
2
RICMASS, Rome International Center for Materials Science Superstripes, Via dei Sabelli 119A, Rome 00185, Italy
3
CNR—Istituto Struttura della Materia & Elettra-Sincrotrone Trieste, Basovizza Area Science Park, Trieste 34149, Italy
4
Dipartimento di Ingegneria Elettrica, Elettronica e Informatica, University of Catania, Catania 95126, Italy
5
Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Beijing 100049, China
6
Dipartimento di Fisica, University of Rome Sapienza, Rome 00185, Italy
7
CNR—Istituto per la Microelettronica e Microsistemi-IMM, VIII Strada 5, Catania 95121, Italy
8
Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, Catania 95125, Italy
9
Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Antonio Bianconi
Received: 7 April 2017 / Revised: 9 May 2017 / Accepted: 22 May 2017 / Published: 25 May 2017
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Abstract

Technological activities to design, manufacture, and test new accelerating devices using different materials and methods is under way all over the world. The main goal of these studies is to increase the accelerating gradients and reduce the probability of radio-frequency (RF) breakdown. Indeed, it is still not clear why, by increasing the intensity of the applied field, intense surface damage is observed in copper structures, limiting the lifetime and, therefore, the practical applications. A possible solution is represented by a coating of a relatively thick layer of molybdenum in order to improve the breakdown rate. molybdenum can be reliably grown on different substrates with a negligible strain and, for thicknesses up to 600 nm, with a resistivity < 100–150·μΩ cm. Moreover, Mo coatings with controlled composition, internal stress, and roughness may allow improving thermo-mechanical properties reaching values not attainable by uncoated copper. Although the Mo conductivity remains lower compared to Cu, a Mo coating represents a very interesting option for high gradient accelerator components manufactured in copper. View Full-Text
Keywords: high gradient structures; breakdown; molybdenum coating; annealed films; transport experiments; X-ray absorption spectroscopy high gradient structures; breakdown; molybdenum coating; annealed films; transport experiments; X-ray absorption spectroscopy
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MDPI and ACS Style

Marcelli, A.; Spataro, B.; Castorina, G.; Xu, W.; Sarti, S.; Monforte, F.; Cibin, G. Materials and Breakdown Phenomena: Heterogeneous Molybdenum Metallic Films. Condens. Matter 2017, 2, 18.

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