Engineering design and fabrication of X-band ac. structure TD24 with WFM (F. Peauger, P. Girardot, CEA Saclay, France, A. Andersson, G. Riddone, S. Atieh, CERN, Geneva, Switzerland, A. Samoshkin, A. Solodko, D. Gudkov, JINR, Dubna, Russia, R. Zennaro, PSI, Villigen, Switzerland)