High electric fields in a superconducting RFQ structure

Helium Gas Evacuation in Superconducting Rfq Structure

The PIAVE injector for the Legnaro Accelerator complex is an accelerating machine made of superconducting resonators. One of them, the superconducting RFQ, needs to be cooled by the helium bath on the whole outer surfaces. In particular the region of the electrode tips and the lower vertical electrode are interested to RF power dissipation and can be a trapped volume of liquid. During the opera...

Applications of Superconducting RFQ linear accelerators

The successful demonstration of PIAVE superconducting RFQ (SRFQ) resonator gives the opportunity of new applications, making possible the construction of compact CW accelerators, driven by small RF systems. In this paper, we outline the basic principles of SRFQ design, and discuss the possible applications to the acceleration of Exotic Ion beams and intermediate intensity proton beams for Posit...

Unusual dc electric fields induced by a high frequency alternating current in superconducting Nb films under a perpendicular magnetic field

We report a systematic study of dc electric fields produced by sinusoidal high frequency ac currents in Nb superconducting films subject to a constant magnetic field perpendicular to the film plane. At frequencies in the 100 kHz to MHz range appears a new rectification effect which has not been previously observed at lower frequencies. We have observed the dc electric field generated in this re...

Atomic emission spectroscopy in high electric fields

Pulsed-power driven ion diodes generating quasi-static, -10 MV/cm, 1-cm scale-length electric fields are used to accelerate lithium ion beams for inertial confinement fusion applications. Atomic emission spectroscopy measurements contribute to understanding the acceleration gap physics, in particular by combining timeand space-resolved measurements of the electric field with the Poisson equatio...

Plasma instabilities in high electric fields.