Title :
Witness gun for the Argonne Wakefield Accelerator
Author :
Power, J. ; Simpson, J. ; Chojnacki, E. ; Konecny, R.
Author_Institution :
Argonne Nat. Lab., IL, USA
Abstract :
The witness gun for the Argonne Wakefield Accelerator (AWA) is a six-cell, copper, iris loaded, RF photocathode operating at 1.3 GHz in a π/2 standing wave mode. An intense drive beam (up to 100 nC @ 20 psec FWHM) will be used in the AWA project to excite (i.e. drive) wakefields in at least two separate test devices: a dielectric loaded cylindrical waveguide and a plasma cell. In both cases a low charge, low emittance witness beam (0.1 nC charge, 1 πmm-mrad 90% physical emittance) is required to probe (i.e. witness) the wakefields left behind by the drive beam. This paper will primarily discuss the recent progress in the construction of the witness gun, while also briefly summarizing the central design issues of the gun. A brief status report on the dielectric witness gun option is also included. We conclude with a short statement on our near term future plans
Keywords :
accelerator RF systems; collective accelerators; dielectric-loaded waveguides; electron accelerators; electron guns; electron sources; particle sources; photocathodes; wakefield accelerators; 1.3 GHz; 20 ps; AWA; Argonne Wakefield Accelerator; Cu; dielectric loaded cylindrical waveguide; intense drive beam; plasma cell; six-cell iris loaded RF photocathode; standing wave mode; witness gun; Acceleration; Cathodes; Copper; Dielectric devices; Iris; Loaded waveguides; Particle beams; Radio frequency; Structural beams; Testing;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.505101
