We present here the first experimental test of a singlepass non-destructive method of monitoring of longitudinal charge distribution in an intensive relativistic electron bunch. This method is based on the scanning of a thin electron beam within the energy range 20-100 kV in the electromagnetic field of an intensive relativistic bunch.The probe beam was injected across the path of primary relativistic bunch. This type of an electron beam probe is suitable for both circular or linear accelerators. The prototype results obtained at VEPP-3 storage ring are in good agreement with the calculations and give us a very high degree of confidence that this single bunch diagnostic tool can be very useful not only for accelerator tuning , but also for precise measurements.
The work addresses the use of electron beam produced by the
linear induction accelerator to generate terahertz radiation pulses
of 100 MW power level based on a free electron laser scheme. The
beam parameters required for efficient generation are given. The
features of transverse beam dynamics when transporting the beam
through the linac are investigated. Emphasis is put on the electron
injector which geometry and operation parameters mainly determine
the beam characteristics at the linac exit. Most of the possible
factors contributing to the beam emittance gain in the accelerator
are considered. The obtained analytical estimates are compared to
the numerical simulation results. The experimental results on
compressing and transporting the beam having the electron energy of
5 MeV and the current of 1 kA in the transport system of free
electron laser are presented.
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