Internally oxidized Ag/1.2 at.% Mg sheaths for Bi-2223 tapes

Abstract

For high-power operation of charged particle rf accelerators, the input coupler windows must withstand enormous stresses due to charging induced by the highenergy charged particle beam passing by and high rf power passing through. Simx most couplers use a single coupling aperture, harmfid asymmetrical rf kick on the beam at the coupler-cavity interface exists. If this problem is solved by dual cxmpIing, the size of the structure becomes a problem. The almve problems are considered common to both normal conducting and superconducting rf accelerators. In superconducting structures, since the frequency of operation is usually around 1 GHz, compactness of the coupler is also a great concern for the cryostat design. Two new waveguide coupler designs that may solve the above-mentioned problems are discussed.

Process to densify Bi2Sr2CaCu2O X round wire with overpressure before coil winding and final overpressure heat treatment

“…It suggests non-intuitively that Ag-Mg wire OP-PDed with high oxygen content (PO 2 =5 atm) retains more of its ductility when ODS occurs during OP-PD than the wires OP-PDed with low oxygen content (0.2 and 1.0 atm O 2 ). One possible explanation is that the MgO particle growth process competes with Ag grain growth with increasing temperature [12]. If Mg oxidation occurs before the Ag grains grow, the MgO particles pin the Ag grains, limiting their grain growth.…”