On the basis of low pressure spark discharges a new type of a particle accelerator as been developed. It produces pulsed ion as well as electron beams of high intensities in a gas atmosphere at pressures of the order of 1 mbar. The method was used to produce in hydrogene at particle energies of about 70 keV an electron beam with a current density of more than 106A/cm 2 at 140A total current. It is shown that magnetic confinement by the pinch effect takes place in the discharge. Discharge times smaller than 5 ns and spark frequencies up to 2 MHz can be obtained.
Thin YBaCuO films have been deposited on ZrO2(Y) and SrTiO3 substrates by a novel ablation method, using a pulsed intense electron beam generated by a pseudospark source. Films with zero resistance around 85 K were grown at substrate temperatures of 820 °C with high reproducibility. X-ray analysis indicates highly textured growth on both substrates. Jc values were 6×106 A/cm2 at 4.2 K and 1.1×105 A/cm2 at 77 K. Because of the high simplicity of the deposition system and the variety of changeable parameters it represents an interesting alternative to existing laser ablation methods.
We present a new technique to continuously measure and compensate the global difference coupling coefficient through the continuous measurements of eigenmode projection parameters, using a high resolution phase-locked-loop tune meter. First, four eigenmode projection parameters are defined as the observables for weak difference coupling. Then, their analytical expressions are obtained using the strict matrix treatment and the Hamiltonian perturbation theory of linear coupling. From these parameters, the complex global coupling coefficient can be fully determined and compensated. This method was successfully demonstrated in the Relativistic Heavy Ion Collider (RHIC) 2006 run.
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