Longitudinal Bunch Lengthening Compensation in a High Charge Rf Photoinjector

In high charge RF photoinjectors for wakefield two beam acceleration studies, due to the strong longitudinal space charge, bunch lengthening between the photocathode and photoinjector exit is a critical issue. We present beam dynamics studies of bunch lengthening in an RF photoinjector for a high charge electron beam and describe methods to compensate the bunch lengthening to various degrees. In particular, the beam dynamics for bunch charge from 1nC to 30nC are studied for an S-band 2856MHz photoinjector. Contributed to the XXIV Linear Accelerator Conference, LINAC08, Victoria, British Columbia, Canada, September 29 – October 3, 2008 ____________________________________________ *Work supported by the DOE under contract DE-AC02-76SF00515. #[email protected] LONGITUDINAL BUNCH LENGTHENING COMPENSATION IN A HIGH CHARGE RF PHOTOINJECTOR S. Pei and C. Adolphsen, Stanford Linear Accelerator Center, Menlo Park, CA 94025, USA Abstract In high charge RF photoinjectors for two-beam wakefield accelerators, bunch lengthening between the photocathode and photoinjector exit is a critical issue due to the strong longitudinal space charge forces. We present beam dynamics studies of bunch lengthening in an RF photoinjector for a high charge electron beam and describe methods to compensate the bunch lengthening to various degrees. In particular, the beam dynamics for bunch charge from 1 nC to 30 nC are studied for an S-band (2856 MHz) photoinjector.In high charge RF photoinjectors for two-beam wakefield accelerators, bunch lengthening between the photocathode and photoinjector exit is a critical issue due to the strong longitudinal space charge forces. We present beam dynamics studies of bunch lengthening in an RF photoinjector for a high charge electron beam and describe methods to compensate the bunch lengthening to various degrees. In particular, the beam dynamics for bunch charge from 1 nC to 30 nC are studied for an S-band (2856 MHz) photoinjector.