@article{5497, author = {C. A. J. van der Geer and R. J. Bakker and A. F. G. van der Meer and P. W. van Amersfoort and W. A. Gillespie and G. Saxon}, title = {Bunching of an Intense Electron-Beam Extracted from a Triode Gun Modulated at 1 Ghz}, abstract = {We present measurements of the bunch length and emittance of a high-current electron beam, which is extracted from a triode modulated at 1 GHz and subsequently compressed by means of velocity modulation in a prebuncher cavity. The prebuncher is detuned by about 1 MHz in order to ensure that the total field, which is the sum of the field from an external generator and the beam-induced field, has the correct phase and amplitude. The bunch length is measured by means of a capacitive pick-up probe and a 20 GHz sampling oscilloscope. A bunch length of 40 ps, at a charge of 220 pC, has been obtained at the end of the drift space behind the prebuncher, which has a length of 200 mm. The normalized emittance is 36-pi mm mrad.}, year = {1991}, journal = {Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment}, volume = {307}, number = {2-3}, pages = {553-561}, month = {Oct 1}, isbn = {0168-9002}, doi = {10.1016/0168-9002(91)90230-n}, language = {eng}, }