Superconducting Prototype Cavities for the Spallation Neutron Source (SNS)Project

摘要

The Spallation Neutron Source project includes a superconducting linac section inthe energy range from 192 MeV to 1000 MeV, operating at afrequency of 805 MHz at 2.1 K. For this energy range two types of cavities are needed with geometrical values of < or > 0.61 and < or > 0.81. An aggressive cavity prototyping program is being pursued at Jlab, which calls for fabricating and testing of four < or > 0.61 cavities and two < or > 0.81 cavities. Both types consist of six cells made from high purity niobium and feature one HOM coupler on each beam pipe and a port for a high power coaxial input coupler. Three of the four < or > 0.61 cavities will be used for a cryomodule test in early 2002. At this time four medium cavities and one high cavity have been completed at JLab. The first tests on the < or > 0.61 cavity and the < or > 0.81 exceeded the design values for gradient