Where L is the luminosity in units 10cm s s , r is the beam aspect ratio at the collision point, Ebeam the beam energy in GeV, v the beam-beam tune shift parameter, ? v the beta function at collision point and Ibeam is the average single beam current in amperes. Our strategy for increasing L is described in reference [1]; here we will reiterate the main points. Provided the single bunch current...

in this paper, in order to analyze the transverse vibration of a uniform bernoulli-euler beam containing one single edge crack, a new continuous model is proposed for the cracked section. to this end, by using the fracture mechanics, the crack is modeled as a continuous disturbance in the stress and strain fields. by applying the hamilton’s principle, the equation of motion and the correspondin...

We present the conceptual design for miniBeBe detector proposed to be installed as a level-0 trigger TOF of NICA-MPD . discuss and geometrical array its sensitive parts, read-out electronics well mechanical support that is envisioned. also simulation results p + Bi collisions study capabilities function multiplicity both TOF, serve beam-gas interaction veto locate beam-beam vertex.

We report measurements of the photorefractive phase shift and coupling constant of several photorefractive materials. We solve the problem of beam coupling and diffraction in a material with a dynamically written grating for arbitrary input beams. These solutions are used to determine the beam coupling as a function of the photorefractive phase ø and coupling constant g when one beam is either ...

A new type of rotating anticathode X-ray generator, where an electron beam of up to 60 keV irradiates the inner surface of a U-shaped Cu anticathode, has achieved a beam brilliance of 130 kW mm(-2) (at 2.3 kW). A higher-flux electron beam is expected from simulation by optimizing the geometry of a combined-function-type magnet instead of the fringing field of the bending magnet. In order to min...

Synchrotron oscillations in a storage ring can be driven by noise in the storage ring RF system. For phase noise in the master oscillator, which falls off exponentially with frequency, we show that beam oscillations can become significant in cases of moderate to heavy beam loading. We derive the transfer function for generator phase to beam phase and calculate the beam motion using the measured...

In this note we present results of beam tracking in the NLC extraction line for the NLC option with high luminosity beam parameters (Option H). Particle losses for 0.5 TeV and 1 TeV cms energy beams have been computed and examined as a function of beam offset at the interaction point (IP). Updated tracking results for the NLC Option A are presented as well. Beam Losses in the NLC Extraction Lin...

Observations of relativistic beam focusing by a passive plasma lens have demonstrated a reduction in focusing strength due to plasma return current. A 50 MeV beam was propagated through a 1–3 cm long plasma with density around 1014 cm23. Beam size was measured as a function of propagation distance. For a ratio of collisionless plasma skin depth to beam spot size kpsr 0.33, no significant reduct...

In an electron beam sustained discharge Xenon laser the discharge energy deposition has been varied in order to investigate the saturation effect on the Xenon laser. The current density of the electron beam is varied separately in the range of 0.1-2.7 A/cmz to obtain optimized discharge excitation conditions as a function of electron beam current density and gas pressure. An optimal fractional ...

A study is presented of a possible future measurement of the longitudinal structure function FL(x,Q ) with different proton beam energies at HERA. To appear in the proceedings of the workshop “Future Physics at HERA”, DESY, Hamburg, 1996. Future Measurement of the Longitudinal Proton Structure Function at HERA L.A.T. Bauerdick, A. Glazov, M. Klein a DESY, Notkestraße 85, D-22607 Hamburg, German...