Electron Loading in L- and S-Band Superconducting Niobium Cavities

Electron loading has been investigated in super-conducting niobium L- and S-band TM010 mode single-cell cavities at high field by observing the x-radiation which electrons accelerated by the RF fields produce on collisison with a cavity wall. This x-radiation has been studied for various cavity lengths, cavity resonant frequencies, and vacuum and surface conditions. Also, electron loading has been found to produce regenerative excitation of higher modes in both L- and S-band cavities.