[en] An emittance selector for electron beams in the ion-channel guiding regime was experimentally demonstrated. Essential features of the ion-channel guiding emittance selector and beam transport experiments using the selector are presented. (author)

[en] This issue is the collection of the papers presented at the title meeting. The 30 of the presented papers are indexed individually. (J.P.N.)

[en] Short communication

[en] Bunch lengthening was measured as a function of the beam current. When the beam current increased, a sudden blowup of the bunch length was observed together with strong coherent oscillations. The bunch shape did not clearly change just before and after the blowup except an increase by 30% of the FWHM. It was observed that the blowup exhibited hysteresis when the beam current decreased. The hysteresis also occurred as a function of the accelerating voltage. The threshold currents of the blowup depended on the accelerating voltage. These experimental observations are described in detail. (author)

[en] Emittance measurements in electron or positron rings are comprehensively reviewed. Priority is given to small vertical emittance measurements (less than 0.1nm). Although the use of synchrotron radiation is mainly discussed, other methods are also mentioned. (author)

[en] The point is made that betatron resonances do not occur at the incoherent value of the tune, but rather at the frequencies of the appropriate collective modes. This has important implications not only for the design of high intensity, low energy proton synchrotrons, but also for the interpretation of machine studies at existing synchrotrons of this type. (author)

[en] The low emittance lattice in which the beam emittance is half of that in regular operation was tested at TRISTAN AR. The measured emittance well agreed with the design value of 1.6 x 10^-7 m. (author)

[en] An instability of the beam phase space due to nonlinear fields results in the dependence of the tune shifts on amplitudes of oscillations of particles and in the excitation of nonlinear resonances. The beam cooling and stochastic processes result in the population of the separatrices of these resonances and in the modulation of the beam distribution function in phases of oscillations. In the last case, the distribution function of the beam becomes a many-parametric function and therefore, a concept of the beam emittance can give only rough description of the beam. (author)

[en] From the combined Liouville-Fokker-Planck equation, extended beam moment equations are derived. Compared to previous approaches that are based on Liouville's theorem, these moment equations contain additional terms that describe both a temperature balancing within the beam as well as a damping of envelope mismatch oscillations. From the moment equations, fairly simple expressions are obtained that allow us to estimate the emittance growth rates due to intra-beam scattering effects. (author)

[en] Fast wire scanners provide measurement of the profile and emittance of the CERN PS circulating beam. The first device was installed in 1985 and has been upgraded in 1994. The system is described briefly: mechanism, monitoring, electronics and controls. The effect of a measurement on the beam and on the wire are shown. The precision is discussed and the system evaluated and compared to ion profile monitors. (author)