Abstract
The Photo Injector Test Facility at DESY in Zeuthen (PITZ) carries out studies of beam-driven plasma wakefield acceleration (PWFA). The facility possesses a flexible photocathode laser beam shaping system and a variety of diagnostics including a high-resolution dipole spectrometer and an rf deflector which enables the observation of the longitudinal phase space of electron beams after their passage through a plasma. Two plasma sources are available: a gas discharge plasma cell and a photoionized lithium vapor plasma cell. Studies at PITZ include investigations of the self-modulation instability of long electron beams and the high transformer ratio, i.e., the ratio between the maximum accelerating field behind the drive beam and the decelerating field within the beam. This overview includes the experimental results and plans for future experiments.
Highlights
Beam-driven plasma wakefield acceleration [1] is one of promising technologies for future highgradient compact accelerators
The facility possesses a flexible photocathode laser beam shaping system and a variety of diagnostics including a highresolution dipole spectrometer and an rf deflector which enables the observation of the longitudinal phase space of electron beams after their passage through a plasma
A trailing relativistic electron bunch placed at an appropriate distance from the driver bunch samples the wakefield and can be accelerated with a gradient exceeding that of conventional accelerators by orders of magnitude
Summary
Beam-driven plasma wakefield acceleration [1] is one of promising technologies for future highgradient compact accelerators. In this scheme, a relativistic particle bunch traverses a plasma and drives a wakefield in it. PITZ has unique capabilities which make it suitable for studying various aspects of PWFA It is a 1.3 GHz rf photoinjector accelerator, capable of producing electron bunches with charges up to 5 nC, momenta up to 25 MeV/c, and emittances down to 0.7 mm mrad for 1 nC bunches at the repetition rate of 10 Hz [2].
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