Abstracts Brochure - CERN

MOPLS — Poster Session 26-Jun-06 16:00 - 18:00
Choosing a Baseline Configuration for the ILC Damping Rings
The damping rings for the International Linear
Collider must be capable of accepting A. Wolski (LBNL) J. Gao (IHEP Beijing) S. Guiducci (INFN/LNF)
large beams from the electron and positron
sources, and producing highly damped beams meeting demanding stability specifications, at the machine repetition
rate of 5 Hz. Between March and November 2005, a program of studies was undertaken by an international collaboration
of 50 researchers to compare a number of configuration options, including ring circumferences between 3
and 17 km. Here, we outline the studies and discuss the principal considerations in the choices of the baseline and
alternative damping ring configurations.
Tuning Algorithms for the ILC Damping Rings
Emittance preservation is an important aspect
in the design and running of the Inter- J.K. Jones (CCLRC/DL/ASTeC)
national Linear Collider with a direct consequence
on the luminosity of the machine. One major area of concern is in the damping rings, where the extracted
emittances set the effective lower limits for the rest of the machine. Algorithms for tuning this system have been
investigated, and simulations have been performed to understand the design and implementation issues. The different
algorithms have been applied to the various damping ring designs, and the effectiveness of each algorithm has
been assessed. A preliminary recommendation of tuning algorithm, and its effectiveness under various conditions,
is given.
The Proposed Conversion of CESR to an ILC Damping Ring Test Facility
In 2008 the Cornell Electron Storage Ring
(CESR) will end nearly three decades of providing
electron-positron collisions for the
CLEO experiment. At that time it will be
M.A. Palmer, R.W. Helms, D. L. Rubin, D. Sagan (Cornell University,
Laboratory for Elementary-Particle Physics)
possible to reconfigure CESR as a damping ring test facility, CesrTF, for the International Linear Collider (ILC) project.
With its complement of 12 damping wigglers, CesrTF will offer horizontal emittances in the few nanometer range
and, ideally, vertical emittances approaching those specified for the ILC damping rings. An important feature of the
CesrTF concept is the ability to operate with positrons or electrons. Positron operation will allow detailed testing
of electron cloud issues critical for the operation of the ILC positron damping rings. Other key features include
operation with wigglers that meet or exceed all ILC damping ring requirements, the ability to operate from 1.5 to 5.5
GeV beam energies, and the provision of a large insertion region for testing damping ring hardware. We discuss in
detail the CesrTF machine parameters, critical conversion issues, and experimental reach for damping ring studies.
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