FERMI@ELETTRA is a seeded free electron laser facility composed by one linac and two FEL lines named FEL-1 and FEL-2. FEL-1 works in HGHG configuration, while FEL-2 is a HGHG cascade implementing fresh bunch injection into the second stage. Performance of FEL-1 and FEL-2 lines have benefited from the use of the laser heater system, which is located right after the injector, at 100 MeV beam energy. Proper tuning of the laser heater parameters has allowed control of the microbunching instability, which is otherwise expected to degrade the high brightness electron beam quality sufficiently to reduce the FEL power. The laser heater was commissioned one year ago and positive effects upon microbunching. In this work we presents further measurements of microbunching suppression in two compressors scheme showing directly the reduction of the beam slice energy spread due to laser heater action. We present measurements showing the impact of the laser heater on FEL2. Copyright © 2013 CC-BY-3.0 and by the respective authors.
Progress with the FERMI laser heater commissioning
Giannessi, L.
2013-01-01
Abstract
FERMI@ELETTRA is a seeded free electron laser facility composed by one linac and two FEL lines named FEL-1 and FEL-2. FEL-1 works in HGHG configuration, while FEL-2 is a HGHG cascade implementing fresh bunch injection into the second stage. Performance of FEL-1 and FEL-2 lines have benefited from the use of the laser heater system, which is located right after the injector, at 100 MeV beam energy. Proper tuning of the laser heater parameters has allowed control of the microbunching instability, which is otherwise expected to degrade the high brightness electron beam quality sufficiently to reduce the FEL power. The laser heater was commissioned one year ago and positive effects upon microbunching. In this work we presents further measurements of microbunching suppression in two compressors scheme showing directly the reduction of the beam slice energy spread due to laser heater action. We present measurements showing the impact of the laser heater on FEL2. Copyright © 2013 CC-BY-3.0 and by the respective authors.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
