In a Cerenkov FEL (CFEL), the phase velocity of an EM wave is determined by geometry (i.e., waveguide radius and inner liner radius) and by material parameters (i.e., the dielectric constant of the liner). Changes or fluctuations in any of these parameters induce changes (or fluctuations) in the phase velocity of the EM wave and thus can degrade the gain of the CFEL. To investigate the effect of such fluctuations on the gain, a method is developed to describe the effect of a slowly varying inner liner radius on the EM wave propagation and consequently on the gain of the CFEL. As an example, results for a low gain, 800 mA Cerenkov FEL operating at a frequency of 50 GHz and a maximum beam voltage of 100 kV are presented.
|Title of host publication||FEL 2004|
|Subtitle of host publication||26th International Free Electron Laser Conference & 11th FEL Users Workshop|
|Editors||René Bakker, Luca Giannessi, Marino Marsi, Richard Walker|
|Place of Publication||Trieste|
|Publisher||Comitato Conferenze Elettra|
|Number of pages||4|
|Publication status||Published - 29 Aug 2005|
|Event||26th International Free Electron Laser Conference, FEL 2004 - Trieste, Italy|
Duration: 29 Aug 2004 → 3 Sep 2004
Conference number: 26
|Conference||26th International Free Electron Laser Conference, FEL 2004|
|Period||29/08/04 → 3/09/04|
van der Slot, P., de la Fuente, I., & Boller, K. (2005). The effect of linear induced phase fluctuations on the gain of a Cerenkov FEL. In R. Bakker, L. Giannessi, M. Marsi, & R. Walker (Eds.), FEL 2004: 26th International Free Electron Laser Conference & 11th FEL Users Workshop (pp. 53-56). Trieste: Comitato Conferenze Elettra.