Author: Mares, F.
Paper Title Page
MOPC046 CaCo: A Cavity Combiner for IOTs Amplifiers 181
 
  • B. Bravo, F. Mares, F. Pérez, P. Sanchez
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  • M.L. Langlois
    ESRF, Grenoble, France
 
  The ALBA stor­age ring uses six room tem­per­a­ture cav­i­ties; each one fed by two 80 kW IOTs am­pli­fiers at 499.654 MHz. The power of the pair of trans­mit­ters is com­bined by a cav­i­ty com­bin­er, CaCo. One of the de­sign re­quire­ments of CaCo was that it con­tin­ued work­ing safe­ly and with a good ef­fi­cien­cy in the case of an IOT fail­ure (asym­met­ri­cal mode). Dur­ing the first asym­met­ric full power tests, in May 2010, with an ac­tive IOT and the other pas­sive, the re­sult was dra­mat­ic, the pas­sive IOT broke in two parts after few hours of op­er­a­tion. This paper pre­sents the ex­per­i­men­tal re­sults and the elec­tro­mag­net­ic field sim­u­la­tions of the asym­met­ri­cal op­er­a­tion mode of CaCo, i.e. one ac­tive IOT and the other pas­sive, and an­a­lyze why the ce­ram­ic of the out­put tube of the pas­sive IOT broke dur­ing the first per­for­mance of this mode. Also, it re­ports a pos­si­ble so­lu­tion to solve this prob­lem.