Progress and Plans for R&D and the Conceptual Design of the ILC Main Linacs

The International Technology Recommendation Panel (ITRP) recommended a superconducting technology for the main linac design of the International Linear Collider (ILC). The basis for this design has been developed and tested at DESY, and R&D is progressing at many laboratories around the world including DESY, Orsay, KEK, FNAL, SLAC, Cornell, and JLAB. The parameters for the ILC Main Linac are discussed and described. The status and role of the different linac test facilities are discussed, and the critical items and R&D program to support a Baseline Configuration and a Conceptual Design are outlined.