Abstracts Brochure - CERN

MOPLS — Poster Session 26-Jun-06 16:00 - 18:00
Test Beam Studies at SLAC’s End Station A for the International Linear Collider
The SLAC Linac can deliver a high-energy
test beam with ILC parameters for bunch
charge, energy spread and bunch length to
End Station A. We use a damped beam at
28.5 GeV and run parasitically with PEP-II at
10Hz. A first commissioning run was performed
in January 2006. We describe results
from this for i) spotsize and emittance measurements
using a wire scanner and quadrupole
scans, ii) energy spread measurements
using a synchrotron light diagnostic, and iii)
bunch length measurements using rf detectors
at a ceramic gap in the beampipe. Longitudinal
phase space distributions were studied
as a function of Linac injection phase and
bunch compressor rf voltage. The large R56
M. Woods, R. Arnold, G.R. Bower, R.A. Erickson, H. Fieguth, C.
Hast, T.W. Markiewicz, D.J. McCormick, J. Nelson, M.C. Ross, S.
Smith, Z. Szalata, P. Tenenbaum (SLAC) D.A.-K. Angal-Kalinin,
C.D. Beard, F. Jackson (CCLRC/DL/ASTeC) R.J. Barlow, G.Yu.
Kourevlev, A. Mercer (UMAN) S.T. Boogert (Royal Holloway, University
of London) D.A. Burton, J.D.A. Smith, R. Tucker (Lancaster
University) W.E. Chickering, C.T. Hlaing, O.N. Khainovski, Y.K.
Kolomensky, T. Orimoto (UCB) C. Densham, R.J.S. Greenhalgh
(CCLRC/DL) M.H. Hildreth (Notre Dame University) A. Lyapin,
D.J. Miller, M.W. Wing (UCL) N. Shales, A. Sopczak (Microwave
Research Group, Lancaster University) M. Slater, M.T. Thomson,
D.R. Ward (University of Cambridge) S. Walston (LLNL) N.K. Watson
(Birmingham University) T. Weiland (TEMF) I. Zagorodnov
(DESY) F. Zimmermann (CERN)
for the 24.5-degree bend from the Linac to ESA is used for bunch compression from the correlated E-z distribution
that results from the compressor voltage, Linac BNS phases and wakefield effects. We describe plans to use this
facility for an initial set of experiments in 2006 to study collimator wakefields, rf bpms and energy spectrometers. We
also describe possibilities for studying aspects of the Interaction Region environment for backgrounds, IP feedback
BPMs and electro-magnetic interference effects.
Beam Impact and Steady State Heating of the ILC Collimators
Spoilers in the ILC Beam Delivery System are
required to survive 1-2 direct bunch impacts
without failure, in addition to maintaining
low geometric and resistive wall wakefields.
G. Ellwood, R.J.S. Greenhalgh (CCLRC/RAL) G.Yu. Kourevlev
(UMAN)
The transient shock wave resulting from rapid localised beam heating and its implications for spoiler design are
studied using ANSYS. The realistic patterns of energy deposition are taken from both FLUKA and GEANT4. Steady
state heating effects are also studied. The results presented quantify uncertainties in the predictions and consider
possible options for spoiler jaws for the ILC.
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