Title :
The UCLA helical permanent-magnet inverse free electron laser
Author :
Tikhoplav, R. ; Frederico, J. ; Reed, G. ; Rosenzweig, J. ; Tochitsky, S. ; Travish, G. ; Gatti, G.
Author_Institution :
UCLA, Los Angeles
Abstract :
The Inverse Free Electron Laser (IFEL) is capable, in principle, of reaching accelerating gradients of up to 1 GV/m making it a prospective accelerator scheme for linear colliders. The Neptune IFEL at UCLA utilizes a 15 MeV Photoinjector-generated electron beam of 0.5 nC and a CO2 laser with peak energy of up to 100 J, and will be able to accelerate electrons to 100 MeV over an 80 cm long, novel helical permanent-magnet undulator. Past IFELs have been limited in their average accelerating gradient due to the Gouy phase shift caused by tight focusing of the drive laser. Here, laser guiding is implemented via an innovative Open Iris-Loaded Structure (OILS) waveguide scheme which ensures that the laser mode size and wave front are conserved through the undulator. The results of the first phase of the experiment are discussed in this paper, including the design and construction of a short micro-bunching undulator, testing of the OILS waveguide, as well as the results of corresponding simulations.
Keywords :
accelerator magnets; electron accelerators; electron beams; free electron lasers; gas lasers; linear colliders; particle beam bunching; particle beam injection; waveguide lasers; wigglers; CO2 laser; Gouy phase shift; Inverse Free Electron Laser; Neptune IFEL; OILS waveguide; Open Iris-Loaded Structure waveguide; UCLA helical permanent-magnet undulator; linear colliders; microbunching undulator; photoinjector-generated electron beam; Acceleration; Colliding beam accelerators; Electron accelerators; Electron beams; Free electron lasers; Laser modes; Linear accelerators; Oils; Undulators; Waveguide lasers;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4440666
