The OTR (Optical Transition Radiation) is a powerful tool to observe 2-dimensional information of beam profile at the high intensity beam line because the OTR intensity only depends on the screen reflectivity so that we can minimize a beam loss. However, it is necessary to overcome large background

We present results of measurements of spot size and angu-lar divergence of a 30 GeV electron beam though use of optical transition radiation (OTR). The OTR near field pat-tern and far field distribution are measured as a function of beam spot size and divergence at wavelengths of 441, 532, and 800

The Linac Coherent Light Source (LCLS), a free-electron x-ray laser, is under design and construction. Its high-intensity electron beam, 3400 A in peak current and 46 TW in peak power, is concentrated in a small area (37 micrometer in rms radius) inside its undulator. Ten optical transition

We report on measurements of the ELSA electron beam transverse emittance obtained by exploiting the optical transition radiation (OTR) properties. The experiments were achieved with a beam of 10-20 ps bunch duration, 0.2 to 3 nC / bunch charge and 16.5 MeV energy. Beam profile and OTR light angular

We present an analysis of data published recently on coherent optical transition radiation interferometry (COTRI) angular distributions made on the Argonne experiment on microbunching [1]. These COTRI distributions exhibited some intriguing characteristics: highly enhanced lobe patterns

Optical Transition Radiation (OTR) based diagnostics tools are widely used in linear accelerators to measure beam parameters like transverse beam size and emittance. Design ideas for OTR stations in the linac section of the BESSY FEL facility are presented. Several key compo-nents will be tested

OTR interferometry (OTRI) has been shown to be an excellent diagnostic for measuring the rms divergence and emittance of relativistic electron beams when the fractional energy spread ∆γ/γ is less than the normalized rms divergence σ = γθrms. This is the case for most beams previously diagnosed with OTRI. To extend this diagnostic capability to beams with larger energy spreads, we have calculated the effects of all the parameters effecting the visibility of OTR interferences, V; i.e. energy spread, angular divergence, the ratio of foil separation to wavelength ratio, d/λ and filter band pass. We have shown that: 1) for a given ∆γ/γ, the sensitivity of V to σ is proportional to the observation angle θ0, the fringe order n and the ratio d/λ; 2) the sensitivity of V to ∆γ/γ is independent of θ0 and n but is proportional to d/λ. Thus, by adjusting d/λ, and choosing the appropriate fringe order, one can separate out and measure both the energy spread and divergence. However, the filter band pass must decrease with θ0 and n. Results of our calculations will be given for various beams of interest.

In this paper we present the first measurements performed

OTR has been widely investigated in the literature as an electron beam diagnostic tool in the high energy region (E> 50 MeV). At lower energy both the model of OTR emission and the experimental observation of the phenomena require a different and more complex approach. Nevertheless the information which can be drawn from OTR spectra at these low energies play a relevant role in new injectors. In this paper we will present and discuss the theoretical work carried out in the last year to provide a suitable background to OTR measurements at energies below 50 MeV.

We present the first time resolved OTR angular distribution measurements of an intense pulsed electron beam (1.7 kA, 60 ns). These initial experiments on the first axis of the Dual Axis Radiographic Hydro-Testing (DARHT) facility and subsequent analysis, demonstrate the possibility to extract, from the data, the energy and the divergence angle of a 3.8 and 20 MeV electrons. 1