Simulations of the Stanford FIREFLY 1 kW free electron laser

A modification of Stanford’s Superconducting Accelerator Free Electron Laser (SCAFEL) has been proposed to increase its average optical power to about 1 kW. The FIREFLY Free Electron Laser (FEL) would be a factor of 100 increase in output power over the most powerful FEL in operation now and would cost about 1 million dollars. Simulations show the evolution of longitudinal modes over many passes and the development of the trapped-particle instability. Power versus desynchronism is studied for