Title :
Pulse-power-induced oscillations of the REX electron beam
Author :
Builta, L.A. ; Carlson, R.L. ; Kauppila, T.J. ; Moir, D.C. ; Ridlon, R.N. ; Hughes, T.P.
Author_Institution :
Los Alamos Nat. Lab., NM, USA
Abstract :
The Relativistic Electron-Beam Experiment (REX) pulse power generator is used to produce a 4 MeV, 5 kA, 50 ns cathode. Multiple current rise times are used to examine pulse-power-induced beam oscillations. Diagnostics include a streak camera and high-speed electronic probes for monitoring current and voltage. Correlation between beam oscillations and TE-TM (transverse electric-transverse magnetic) cylindrical cavity modes in the anode-cathode (A-K) gap is examined. Electromagnetic excitation of the cylindrical A-K gap in the REX experiments was found to produce unacceptable levels of beam motion as a function of time. Correction of hardware asymmetries did not eliminate the problem; the problem was solved by tailoring the current rise time of the pulse power to minimize the coupling of the pulse power drive to the cavity
Keywords :
particle beam diagnostics; relativistic electron beam tubes; 4 MeV; 5 kA; 50 ns; REX electron beam; Relativistic Electron-Beam Experiment; beam diagnostics; beam oscillations; cathode; current rise time; cylindrical cavity modes; hardware asymmetries; high-speed electronic probes; pulse power generator; pulse-power-induced beam oscillations; streak camera; Cameras; Cathodes; Electron beams; High-speed electronics; Magnetosphere; Monitoring; Power generation; Probes; Pulse generation; Voltage;
Conference_Titel :
Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE
Conference_Location :
Chicago, IL
DOI :
10.1109/PAC.1989.72850
