Title :
Design of a dc/rf photoelectron gun
Author :
Yu, D. ; Newsham, D. ; Luo, Y. ; Smirnov, Alexander ; Yu, J. ; Lewellen, J. ; Smedley, J. ; Srinivasan-Rao, T. ; Zholents, A.
Author_Institution :
DULY Res. Inc., Rancho Palos Verdes, CA, USA
Abstract :
An integrated dc/rf photoelectron gun produces a low-emittance beam by first rapidly accelerating electrons at a high gradient during a short (∼1 ns), high-voltage pulse, and then injecting the electrons into an rf cavity for subsequent acceleration. Simulations show that significant improvement of the emittance appears when a high field (∼0.5 - 1 GV/m) is applied to the cathode surface. An adjustable dc gap (≤ 1 mm) which can be integrated with an rf cavity is designed for initial testing at the Injector Test Stand at Argonne National Laboratory using an existing 70-kV pulse generator. Plans for additional experiments of an integrated dc/rf gun with a 250-kV pulse generator are being made.
Keywords :
accelerator RF systems; accelerator cavities; cathodes; electron beams; electron guns; electron sources; particle beam injection; pulse generators; 250 kV; 70 kV; adjustable dc gap; cathode surface; electron injection; high-voltage pulse; integrated dc/rf photoelectron gun; low-emittance beam; pulse generator; rf cavity; Acceleration; Cathodes; Electron beams; Electron emission; Laser beams; Particle beams; Pulse generation; Radio frequency; Testing; Voltage;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1288807
