|Title||Bunching of an Intense Electron-Beam Extracted from a Triode Gun Modulated at 1 Ghz|
|Publication Type||Journal Article|
|Year of Publication||1991|
|Authors||C.AJ van der Geer, R.J Bakker, A.FG van der Meer, P.W van Amersfoort, W.A Gillespie, G. Saxon|
|Journal||Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment|
|Date Published||Oct 1|
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.
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