Abstract:
To achieve the required damping time in the main damping
rings for the Next Linear Collider (NLC), a wiggler will be
required in each ring with integrated squared field strength
up to 110 T 2 m [1]. There are concerns that nonlinear
components of the wiggler field will damage the dynamic
aperture of the ring, leading to poor injection efficiency.
Severe effects from an insertion device have been observed
and corrected in SPEAR 2 [2]. In this paper, we describe a
model that we have developed to study the effects of the
damping wiggler, compare the predictions of the model with
actual experience in the case of the SPEAR 2 wiggler, and
consider the predicted effects of current damping wiggler
design on the NLC main damping rings.