Title :
An improved thermionic microwave gun and emittance-preserving transport line
Author :
Borland, Michael
Author_Institution :
Argonne Nat. Lab., IL, USA
Abstract :
The positron/electron linac for the Advanced Photon Source (APS) at Argonne National Laboratory can be used to accelerate electrons to 650 MeV. As part of a project, to use this linac to test the quality of insertion devices, work has been done to develop a higher-brightness thermionic microwave gun of the SSRL type. The new gun design has smaller emittance by a factor of 3 to 4. The ratio of cathode field to maximum surface field is more than doubled. The new alpha-magnet-based transport line design produces negligible emittance degradation due to chromatic aberrations, in spite of the ±5% momentum spread
Keywords :
beam handling techniques; electron guns; electron sources; thermionic cathodes; thermionic electron emission; Advanced Photon Source; chromatic aberrations; emittance; emittance degradation; positron/electron linac; thermionic microwave gun; transport line; Cathodes; Design optimization; Electron beams; Guns; Impedance; Nose; Page description languages; Radio frequency; Resonance; Undulators;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.309535