Transversal temperature measurement in electron cooling experiment

In order to optimize the beam properties and achieve satisfactory cooling performance for an electron cooling device, it is essential to have adequate diagnostics system both for use on a test stand and in the operational environment. Beam transversal electron temperature is a very important information to be picked up. For this purpose pick-ups with a high sensitivity and a wide bandwidth, working in the microwave bands, are suggested. The use of such a kind of pick-ups is directly correlated to the fact that the electron beam is confined in an axial magnetic field. In this paper the study, design and laboratory results of pick-up to measure the transversal temperature of the electron beam, in a high-energy electron cooling device, are presented

Optical Cavity of the Adone FEL Experiment

A detailed description of the parameter choice for the LELA optical cavity is presented. Particular attention has been devoted to the alignement problems solved by means of a remote control system. First results on mirror damage due to UV radiation will be also reported

Analytic and experimental analysis of the undulator radiation at finite distance as a function of the e-beam parameters

The radiation emitted by the linear undulator installed on a straight section of the ADONE storage ring is studied both experimentally and theoretically. In particular, expressions are provided for the field at finite distance, based on the complex Fresnel integral. In addition, several expressions are derived for the average intensity pattern as a function of the electron beam divergence and energy spread. These formulae are used for analysing the spectral and angular patterns of the radiation measured from a distance of 20 m from the undulator origin. The excellent quality of the undulator and the negligible influence on the pattern of the electron beam divergence are confirmed by the satisfactory agreement of the measured radiation field with the computer-generated one

A storage ring for crystalline beam studies

The possibility of generating crystallized ion beams, i.e. beams whose particles are located at fixed positions, has always excited the interest of most people working on particle accelerators. The reason of this interest has many aspects: knowledge either of a completely new research field or of some of the applicative potentialities, connected with crystalline beams, would justify a careful investigation of this subject. After the successful exploitation of electron cooling in several heavy ion storage rings the possibility of generating crystalline ion beams became more realistic. New cooling methods, like laser cooling, give a further opportunity to reach an ultracold system of particles necessary for the state transition to the crystalline configuration. The conceptual design of a low-energy heavy-ion storage ring, called CRYSTAL, proposed for the experimental demonstration of crystalline beams at Legnaro Laboratories is presented. The physics of crystalline beams as well as the main criteria to design a storage ring suitable to crystallize ion beams are discussed. The effects of instabilities for space charge dominated beams, shear forces in dipole magnets and lattice periodicity breaking are also discussed in detail