Abstracts Brochure - 2nd International Particle Accelerator Conference

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Classification 3: Linear Colliders, Lepton Accelerators and New Acceleration Techniques
Poster Panel 24
ID: 3003 - TUPC011
Development of Striplines for the CLIC Pre-
Damping and Damping Ring Kickers,
Carolina Belver-Aguilar, Angeles Faus-Golfe
(IFIC, Valencia), Michael John Barnes (CERN,
Geneva), Fernando Toral (CIEMAT, Madrid) - The
Compact Linear Collider (CLIC) study is exploring
the scheme for an electron-positron collider with
high luminosity and a nominal center-of-mass
energy of 3 TeV: CLIC would complement LHC
physics in the multi-TeV range. The CLIC design
relies on the presence of Pre-Damping Rings (PDR)
and Damping Rings (DR) to achieve, through
synchrotron radiation, the very low emittance
needed to fulfil the luminosity requirements. The
specifications for the kicker systems are very
challenging and include very low beam coupling
impedance and excellent field homogeneity:
striplines have been chosen for the kicker elements.
Analytical calculations have been carried out to
determine the effect of tapering upon the high
frequency beam coupling impedance. In addition
detailed numerical modeling of the field
homogeneity has been performed and the sensitivity
of the homogeneity to various parameters, including
stripline cross-section, has been studied. This paper
presents the main conclusions of the beam
impedance calculations and field homogeneity
predictions.
Sub Classification: A03 Linear Colliders
Poster Panel 25
ID: 3993 - TUPC001
Recent Developments in Beam-beam Simulations
Relevant for Multi-TeV Linear Colliders,
Jakob Esberg, Ulrik Ingerslev Uggerhøj (Aarhus
University, Aarhus), Daniel Schulte (CERN,
Geneva) - The design of a detector and post
collisional line of a future linear collider calls for
detailed knowledge of the beam-beam dynamics at
the interaction point. We here describe the
implementation and results of new simulation tools
in the program GUINEA-PIG. The subjects are
direct trident production relevant in the deep
quantum-regime, incoherent muon generation,
synchrotron radiation from secondary particles and
depolarization effects. We choose beam parameters
in the range relevant for CLIC and comment on the
implications for the design of such a machine.
Sub Classification: A03 Linear Colliders
8
Poster Panel 26
ID: 2893 - TUPC014
System Control for the CLIC Main Beam
Quadrupole Stabilization and Nano-positioning,
Stef Janssens, Kurt Artoos, Christophe Collette,
Pablo Fernandez Carmona, Michael Guinchard,
Claude Hauviller, Andrey Kuzmin, Raphael Leuxe,
Juergen Pfingstner, Daniel Schulte, Jochem
Snuverink (CERN, Geneva) - The conceptual design
of the active stabilization and nano-positioning of
the CLIC main beam quadrupoles was validated in
models and experimentally demonstrated on test
benches. Although the mechanical vibrations were
reduced to within the specification of 1.5 nm at 1
Hz, additional input for the stabilization system
control was received from integrated luminosity
simulations that included the measured stabilization
transfer functions. Studies are ongoing to obtain a
transfer function which is more compatible with
beam based orbit feedback; it concerns the controller
layout, new sensors and their combination. In
addition, the gain margin must be increased in order
to reach the requirements from a higher vibration
background. For this purpose, the mechanical
support is adapted to raise the frequency of some
resonances in the system and the implementation of
force sensors is considered. Furthermore, this will
increase the speed of repositioning the magnets
between beam pulses. This paper describes the
improvements and their implementation from a
controls perspective.
Sub Classification: A03 Linear Colliders
Poster Panel 27
ID: 3108 - TUPC036
S-band ps Pulse Photoinjector for THz Radiation
Source, Sergey Markovich Polozov,
Taras Vladimirovich Bondarenko (MEPhI,
Moscow) - S-band photoinjectors with ps pulse are
becoming promising as e-guns for high-intensity
sub-mm wavelength pulse source. Development of
accelerating system for photoinjector with ps bunch
is reported. The main aim is to develop a model of
accelerating structure that provide top accelerating
fields in respect to high electric strength and low RF
power uses. The accelerating structures consisting of
1.6 cell of disk-loaded waveguide (DLW), 3 cells
and 2 half-cells of DLW, 7 cels and 2 half-cells of
DLW and accelerating structure based on running
wave resonator with 7 cells and 2 half-cells of DLW