Abstracts Brochure - CERN

MOPLS064
MOPLS065
MOPLS066
26-Jun-06 16:00 - 18:00 MOPLS — Poster Session
Measurement of Ground Motion in Various Sites
R. Amirikas, A. Bertolini, W. Bialowons, H. Ehrlichmann, D.
Kruecker (DESY)
126
This presentation will be an overview of a
study program, initiated in DESY, to measure
ground vibration of various sites which
can be used for site characterization for the
International Linear Collider (ILC) design. Commercial broadband seismometers have been used to measure ground
motion, correlation and surface wave velocity. The database of measured ground vibrations is available to the scientific
community. A parameterization of the spectra will also be presented.
An ILC Main Linac Simulation Package Based on Merlin
The preservation of the ultra-small vertical
N.J. Walker, D. Kruecker, F. Poirier (DESY)
emittance in the International Linear Collider
(ILC) will require the use of beam-based
alignment techniques, the expected performance of which relies heavily on the use of simulation tools. In this report,
we present the newest release of a purpose-built ILC main linac simulation tool, based on the Merlin* C++ class
library. Examples of results from Dispersion Free Steering (DFS) simulations are also be presented.
*http://www.desy.de/∼merlin
Direct Measurement of Geometric and Resistive Wakefields in Tapered Collimators for the
International Linear Collider
Precise collimation of the beam halo is re-
N.K. Watson (Birmingham University)
quired in the ILC to prevent beam losses near
the interaction region that could cause unacceptable
backgrounds for the physics detector. The necessarily small apertures of the collimators lead to transverse
wakefields that may result in beam deflections and increased emittance. A set of collimator wakefield measurements
has previously been performed in the ASSET region of the SLAC LINAC. We report on the next phase of this programme,
which is carried out at the recently commissioned End Station A test facility at SLAC. Measurements of
resistive and geometric wakefields using tapered collimators are compared with model predictions from MAFIA and
GdfidL and with analytic calculations.