The mechanical design of the BARREL section of the detector CALIFA for R3B-FAIR. E. Casarejos, H. Alvarez-Pol, D. Cortina-Gil, I. Durán, P. Izquierdo, P. Yañez and J.A. Vilán EPJ Web of Conferences, 66 (2014) 11037 Published online: 20 March 2014 DOI: 10.1051/epjconf/20146611037