Roadmap for ILC detector R&D test beam

This document provides a roadmap for ILC Detector test beam needs in the next 3 - 5 years. In this period, detector Letters of Intent are expected by fall 2008, the ILC Engineering Design Report to be submitted in early 2010 (with detector Technical Design Reports soon thereafter) and funding approval to construct the ILC and its detectors in 2012. ILC Detectors are required to have unprecedented precision to be able to elucidate new physics discoveries at TeV energies from the LHC and ILC machines, and to fully exploit experimental investigation at the electroweak unification energy scale. Achieving this requires significant investment for detector test beam activities to complete the R&D needed, to test prototypes and (later) to qualify final detector system designs, including integrated system tests. This roadmap document describes the need for a significant increase in resources for ILC test beam activities. It should be used by test beam facility managers and the worldwide ILC leadership to assure that the necessary resources and facilities are made available to meet the needs in time. (author)