Title :
Coherent terahertz radiation from optically pre-bunched electron beams
Author :
Fiorito, R.B. ; Neumann, J. ; Freund, H.P. ; O´Shea, P.G. ; Loos, H. ; Sheehy, B. ; Carr, G.L. ; Graves, W.S.
Author_Institution :
Inst. for Res. in Electron. & Appl. Phys., Maryland Univ., College Park, MD, USA
fDate :
27 Sept.-1 Oct. 2004
Abstract :
A bunched electron beam is an efficient source of coherent radiation at wavelengths longer than the bunch length. We describe an experiment demonstrating electron density modulation at 0.8 THz using an optically modulated drive laser to extract a prebunched beam from an RF photoinjector, which is preserved through acceleration to 75 MeV. Measurements of coherent THz transition radiation (CTTR) are presented at the prebunch frequency showing enhanced production over that produced from an unmodulated beam.
Keywords :
electron accelerators; electron density; laser beam effects; optical modulation; particle beam bunching; submillimetre waves; transition radiation; 0.8 THz; RF photoinjector; coherent THz transition radiation; coherent terahertz radiation; electron density modulation; optically modulated drive laser; optically prebunched electron beams; prebunch frequency; unmodulated beam; Acceleration; Electron beams; Electron optics; Frequency measurement; Laser beams; Laser transitions; Optical beams; Optical modulation; Particle beams; Radio frequency;
Conference_Titel :
Infrared and Millimeter Waves, 2004 and 12th International Conference on Terahertz Electronics, 2004. Conference Digest of the 2004 Joint 29th International Conference on
Print_ISBN :
0-7803-8490-3
DOI :
10.1109/ICIMW.2004.1422237
