Abstracts Brochure - CERN

MOPLS — Poster Session 26-Jun-06 16:00 - 18:00
computation of the high orders of these aberrations using MAD-X and PTC. The use of octupole doublets to reduce
the size of the halo in the locations with aperture limitations is also discussed.
Beam Dynamics and First Operation of the Sub-harmonic Bunching System in the CTF3
Injector
The CLIC Test Facility CTF3, built at CERN
by an international collaboration, aims at
demonstrating the feasibility of the CLIC
scheme by 2010. The CTF3 drive beam gen-
P. Urschütz, G. Carron, R. Corsini, S. Doebert, G. McMonagle, J.P.H.
Sladen, F. Tecker, L. Thorndahl (CERN)
eration scheme is based on the use of a fast phase switch of a sub-harmonic bunching system in order to phase-code
the bunches. The amount of charge in unwanted satellite bunches is an important quantity, which must be minimized.
Beam dynamics simulations have been used to study the problem, showing the limitation of the present CTF3 design
and the gain of potential upgrades. In this paper the results are discussed and compared with beam measurements
taken during the first operation of the system.
Beam Dynamic Studies and Emittance Optimization in the CTF3 Linac at CERN
Small transverse beam emittances and wellknown
lattice functions are crucial for the 30 P. Urschütz, H.-H. Braun, R. Corsini, S. Doebert, F. Tecker (CERN)
GHz power production in the Power Extraction
and Transfer Structure (PETS), and for the commissioning of the delay loop of the CLIC Test Facility 3 (CTF3).
Following beam-dynamics-simulation results, two additional solenoids were installed in the CTF3 injector in order
to improve the emittance. During the 2005 run, an intensive measurement campaign to determine Twiss parameters
and beam size was launched. First results obtained by means of quadrupole scans for different modes of operation
indicate rms emittances well below the nominal (100 pi mm mrad) and a convincing agreement with PARMELA
simulations.
A High-gradient Test of a 30 GHz Molybdenum-iris Structure
The CLIC study is investigating a number
of different materials as part of an effort to
find ways to increase achievable accelerating
gradient. So far, a series of rf tests have
been made with a set of identical-geometry
structures: a tungsten-iris 30 GHz structure,
a molybdenum-iris 30 GHz structure and a
W. Wuensch, C. Achard, H.-H. Braun, G. Carron, R. Corsini, S.
Doebert, R. Fandos, A. Grudiev, E. Jensen, T. Ramsvik, J.A. Rodriguez,
J.P.H. Sladen, I. Syratchev, M. Taborelli, P. Urschütz, I. Wilson
(CERN) H. Aksakal (Ankara University, Faculty of Sciences)
Ö.M. Mete (Ankara University, Faculty of Engineering)
scaled molybdenum-iris X-band structure. A second molybdenum-iris 30 GHz structure of the same geometry has
now been tested in CTF3 with pulse lengths up to 350 ns. The new results are presented and compared to those of the
previous structures to determine dependencies of quantities such as accelerating gradient, material, frequency, pulse
length, power flow, conditioning rate and breakdown rate.
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MOPLS101
MOPLS102
MOPLS103