A. Vignati

Above threshold operation of the ENEA free electron laser

Abstract Recent experimental results of the ENEA FEL experiment performed with a 20 MeV, 120 mA microtron and a linearly polarized pulsed electromagnetic undulator are reported.

Status of the free electron laser experiment at the ENEA Frascati center

Abstract The status of the free electron laser experiment under realization at the ENEA Frascati center is described. The experimental results relevant to electron beam and spontaneous radiation are reported.

Longitudinal phase-space manipulation: a device to enhance the coherent emission from an RF-modulated electron beam

Abstract When a radio-frequency (RF) modulated electron beam passes through a magnetic undulator, coherent emission is produced if the electron bunch length is comparable to the emission wavelength. A method to enhance the coherent spontaneous emission by inducing a proper correlation between the energy and phase distribution of the electrons in the bunch will be presented in this work, together with the design of a device intended to systematically investigate the CSE as a function of the longitudinal phase-space distribution.

Electron accelerators at the ENEA center at Frascati: Development and application

Abstract At the ENEA Frascati Center a number of electron accelerators have been constructed with the aim of their application in scientific research (free-electron lasers, neutron spectroscopy) and industrial materials treatment (cross-linking of polymers, detoxification of potable waters, degradation of phenols). A description of the machines and their application results is given.

The ISS protontherapy LINAC

The TERA foundation stimulated in the past years a comparative study of compact proton accelerators for therapy and at the end of 1995 the Italian National Institute of Health (Istituto Superiore di Sanita, ISS) decided for the construction of a proton linac for its TOP (Terapia Oncologica con Protoni) project. The TOP-LINAC will be composed of a 7 MeV RFQ+DTL injector followed by a 7–65 MeV section of the innovative 3 GHz SCDTL structure and a 65–200 MeV variable energy SCL 3 GHz structure. A 5-cavity model of the SCDTL has been built and measured on a RF test bench while a 11-cavities prototype (accelerating until 12.5 MeV) is under construction and will be assembled within few months. The TOP LINAC whose construction will start at the end of 1996, will be the first linear accelerator dedicated to proton therapy, and the first 3 GHz proton linac. In this paper the accelerator design and the construction schedule will be presented, and the SCDTL structure RF measurements will be discussed.

Infrared FEL microtron operation at the ENEA center of Frascati

Abstract The FEL experimental activity at the ENEA Frascati center is aimed at producing a free electron laser operating in the region λ = 10−30 μ m with an average power of 50 to 100 W, using a microtron as the electron beam source. In this paper we analyze the main experimental features relevant to the realization of the programme.

Microwave emission in the x-band, by means of an intense relativistic electron beam in a rippled magnetic field

Abstract An intense relativistic electron beam with 0.22 MeV energy and beam current of 0.25 kA has been used to generate microwave radiation in the X-band in a static rippled magnetic field. The frequency and power level measured are consistent with the presence of a gain due to an unstable interaction between a slow space charge beam mode, the rippled magnetic field and a waveguide mode (Stimulated Raman Scattering). In addition, microwave emission by a cyclotron maser process was identified.