Technical challenges for head-on collisions and extraction at the ILC Napoly, O. ; Delferrière, O. ; Durante, M. ; Payet, J. ; Rippon, C. ; Uriot, D. ; Balhan, B. ; Borburgh, J. ; Goddard, B. ; Kuroda, S. ; Iwashita, Y. ; del Carmen Alabau, M. ; Bambade, P. ; Brossard, J. ; Dadoun, O. ; Rimbalt, C. ; Sabbi, G. ; Keller, L. ; Angal-Kalinin, D. ; Jackson, F. ; Tzenov, S. ; Appelby, R. Abstract Publication: 22nd Particle Accelerator Conference (PAC 07) Pub Date: 2007 Bibcode: 2007pac..conf.2716N