Abstracts Brochure - 2nd International Particle Accelerator Conference

Funding Agency: Work supported by European
Commission under the FP7 Research Infrastructures
grant agreement No. 227579.
Sub Classification: T03 Beam Diagnostics and
Instrumentation
Poster Panel 93
ID: 3376 - MOPO005
A Transverse Feedback System using Multiple
Pickups for Noise Minimization,
Mouhammad Alhumaidi, Abdelhak M. Zoubir (TU
Darmstadt, Darmstadt) - A new concept for using
multiple pickups for estimating beam angle at the
kicker is addressed. The estimated signal should be
the driving feedback signal. The signals from the
different pickups are delayed, such that they
correspond to the same bunch. Consequently a
weighted sum of the delayed signals is suggested as
an estimator of the beam angle at the kicker. The
weighting coefficients are calculated such that the
estimator is unbiased, i.e. the output corresponds to
the actual beam angle at the kicker for non-noisy
pickup signals. Furthermore, the estimator must give
the minimal noise power at the output among all
linear unbiased estimators. Finally results for the
heavy ions synchrotron SIS 18 at the GSI are shown.
Sub Classification: T05 Beam Feedback Systems
Poster Panel 94
ID: 3204 - WEPC166
Monte Carlo Simulation of the Total Dose
Distribution Around the 12 MeV UPC Racetrack
Microtron and Radiation Shielding
Calculations, Cristina de la Fuente, Maria Amor
Duch, Yuri Alexandrovich Kubyshin (UPC,
Barcelona), Vasiliy Ivanovich Shvedunov (MSU,
Moscow) - The Technical University of Catalonia is
building a miniature 12 MeV electron race-track
microtron for medical applications. In the paper we
study the leakage radiation caused by beam losses
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inside the accelerator head, as well as the
bremstrahlung radiation produced by the primary
beam in the commissioning setting. Results of
Monte Carlo simulations using the PENELOPE code
are presented and two shielding schemes, global and
local, are studied. The obtained shielding parameters
are compared with estimates based on international
recommendations of the radiation safety standards.
Sub Classification: T18 Radiation Monitoring and
Safety
Poster Panel 95
ID: 3612 - WEPC174
Beam-induced Quench Test of LHC Main
Quadrupole, Agnieszka Priebe (CERN, Geneva;
EPFL, Lausanne), Knud Dahlerup-Petersen, Bernd
Dehning, Ewald Effinger, Jonathan Emery, Eva
Barbara Holzer, Christoph Kurfuerst, Eduardo
Nebot Del Busto, Annika Nordt, Mariusz Sapinski,
Jens Steckert, Arjan Verweij, Christos Zamantzas
(CERN, Geneva) - Unexpected beam loss might lead
to transition of a superconducting accelerator
magnet to a normal conducting state. The LHC
beam loss monitoring (BLM) system is designed to
abort the beam before the energy deposited in the
magnet coils reaches a quench-provoking level. In
order to verify the threshold settings generated by
simulation, a series of beam-induced quench tests at
various beam energies have been performed. The
beam losses are generated by means of an orbit
bump peaked in one of the main quadrupole
magnets. The analysis not only includes BLM data
but also data from the electrical quench protection
and cryogenic systems. The measurements are
compared to Geant4 simulations of energy
deposition inside the coils and corresponding BLM
signal outside the cryostat. The results are also
extrapolated to higher beam energies.
Sub Classification: T23 Machine Protection