Abstracts Brochure - CERN

MOPLS069
MOPLS070
MOPLS071
26-Jun-06 16:00 - 18:00 MOPLS — Poster Session
Development of a Superconducting Helical Undulator for the ILC Positron Source
Y. Ivanyushenkov (CCLRC/RAL/ASTeC) I.R. Bailey, L.I. Malysheva
(Cockcroft Institute) D.P. Barber (DESY) E. Baynham, T.W.
Bradshaw, A.J. Brummitt, F.S. Carr, J. Rochford (CCLRC/RAL) J.A.
Clarke, O.B. Malyshev, D.J. Scott (CCLRC/DL/ASTeC) P. Cooke,
J.B. Dainton (Liverpool University, Science Faculty) G.A. Moortgat-
Pick (Durham University)
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An undulator positron source has been recently
selected by the International Linear
Collider (ILC) community as a baseline. For
the ILC a helical undulator capable of producing
10 MeV photons and with a period as
close as possible to 10 mm is required. The
HeliCal collaboration in the UK is looking at
the merits of both permanent magnet and su-
perconducting technologies for the design of a helical undulator. For the superconducting option, several prototypes
have been built and tested. This paper details the design, construction and test results of the first superconducting
prototypes.
Simulations of Collimator Insertions for the ESA Wakefield Tests
C.D. Beard (CCLRC/DL/ASTeC) R.M. Jones (SLAC) J.D.A. Smith
(Cockcroft Institute)
A series of collimator spoilers have been designed
and manufactured for testing in the
ESA wakefield tests. The purpose of the tests
is a benchmarking exercise to assist with the
understanding into the causes of wakefields due to spoiler profile and materials. Simulations of the spoiler designs
have been used to understand the likely effects that would be observed with the beam tests. Simulations of these
collimator insertions have been carried out in MAFIA and GDFIDL, and a comparison of the results completed. The
wake potential has been measured, and the corresponding loss factor and kick factors have been calculated. The
results from the simulations are discussed in this report.
Cold Test "Wire Method" Measurements to Assist Spoiler Design for the ILC
C.D. Beard, J.L. Fernandez-Hernando (CCLRC/DL/ASTeC) R.M.
Jones (SLAC) J.D.A. Smith (Cockcroft Institute)
In this report the outcome of the "wire
method" cold test, experimental results and
their relevance toward the ILC set-up is considered.
A wire is stretched through the cen-
tre of a vessel along the axis that the electron beam would take, and a voltage pulse representing the electron bunch
is passed along the wire. The parasitic mode loss parameter from this voltage can then be measured. The bunch
length for the ILC is 0.3mm, requiring a pulse rise time of ∼1ps. The fastest rise time available for a time domain
reflectrometry (TDR) scope is ∼10ps. Reference vessels have been examined to evaluate the suitability of the test gear
at comparable bunch structures to the ILC.