  The Cornell Electron-positron Storage Ring (CESR) has been converted from a
High Energy Physics electron-positron collider to operate as a dedicated
synchrotron light source for the Cornell High Energy Synchrotron Source (CHESS)
and to conduct accelerator physics research as a test accelerator, capable of
studying topics relevant to future damping rings, colliders and light sources.
Some of the specific topics that were targeted for the initial phase of
operation of the storage ring in this mode for CESR as a Test Accelerator
(CesrTA) included 1) tuning techniques to produce low emittance beams, 2) the
study of electron cloud development in a storage ring and 3) intra-beam
scattering effects. The complete conversion of CESR to CesrTA occurred over a
several year period, described elsewhere. In addition to instrumentation for
the storage ring, which was created for CesrTA, existing instrumentation was
modified to facilitate the entire range of investigations to support these
studies. Procedures were developed, often requiring coordinated measurements
among different instruments. This paper describes the instruments utilized for
the study of beam dynamics during the operation of CesrTA. The treatment of
these instruments will remain fairly general in this paper as it focusses on an
overview of the instruments themselves. Their interaction and
inter-relationships during sequences of observations is found in a companion
paper describing the associated measurement techniques. More detailed
descriptions and detailed operational performance for some of the
instrumentation may be found elsewhere and these will be referenced in the
related sections of this paper.
