Abstracts Brochure - 2nd International Particle Accelerator Conference

for the Low-Q IP-BPM were performed with KEK
BPM doublet in Jan. 2011. We got the results of
beam position resolution 70 nm during the
experimental periods and will present the detailed
experimental procedures and results.
Sub Classification: T03 Beam Diagnostics and
Instrumentation
Poster Panel 82
ID: 4043 - TUPC078
The Impact of the Duty Cycle on Gamma-
Particle Coincidence Measurements,
Philipp Rudolf John, Jörg Leske, Norbert Pietralla
(TU Darmstadt, Darmstadt) - Radioactive beam
facilities (like REX-ISOLDE) deliver a great variety
of different radioactive ion beams and thus open
new possibilities for gamma-ray spectroscopy with
radioactive isotopes. One of the challenges for the
experimentalist is the high gamma-background. To
obtain nearly background-free spectra a gammaparticle
coincidence measurement in inverse
kinematics is well suited. Also for stable beams this
method offers a lot of advantages. A crucial point
for experimentalists for such kind of experiments is
the duty cycle and the beam structure of the
accelerator. For a typical set-up, the effect of the
duty cycle and beam structure, resulting from e.g.
different ion-sources, on data acquisition and thus
the experiment will be shown from the
experimentalist's point of view. The results will be
discussed for selected accelerators, i.e. UNILAC
(GSI, Germany), REX-ISOLDE (CERN,
Switzerland) and ATLAS (ANL, USA).
Funding Agency Supported by BMBF under
06DA9041I
Sub Classification: T03 Beam Diagnostics and
Instrumentation
Poster Panel 83
ID: 4262 - TUPC149
Position Determination of Closely Spaced
Bunches using Cavity BPMs,
Nirav Yashvantray Joshi, Stewart Takashi Boogert,
Francis Jamshyd Cullinan, Alexey Lyapin (JAI,
Egham, Surrey) - Cavity Beam Position Monitor
(BPM) systems with high-Q form a major part of
precision position measurement diagnostics for
linear accelerators with low emittance beam. Using
cavity BPMs, the position resolution of less than 100
nm has been demonstrated in single bunch mode
operation. In the case of closely spaced bunches,
where the decay time of the cavity is comparable to
the time separation between bunches, the BPM
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signal from a bunch is polluted by the signal induced
from the previous bunches in the same bunch-train.
This paper discuss our ongoing work to develop the
methods to extract the position of the closely spaced
bunches using cavity BPMs. A signal subtraction
code is being developed to remove the signal
pollution from previous bunches and to determine
the individual bunch position. Another code has
been developed to simulate the BPM data for the
cross check. Performance of the code is studied on
the experimental and simulated data. Application of
the analysis techniques to the linear colliders, such
as International Linear Collider (ILC) and Compact
LInear Collider (CLIC), are briefly discussed.
Sub Classification: T03 Beam Diagnostics and
Instrumentation
Poster Panel 84
ID: 3528 - TUPC087
Filling Pattern Measurements at the ANKA
Storage Ring, Benjamin Kehrer, Nicole Hiller,
Andre Hofmann, Erhard Huttel, Vitali Judin, Marit
Klein, Sebastian Marsching, Anke-Susanne Mueller,
Nigel John Smale (KIT, Karlsruhe) - For many
accelerator physics studies, e.g. the investigation of
coherent synchrotron radiation (CSR), a precise
knowledge of the quantitative filling pattern (i.e. the
number of electrons per bunch) is essential. This can
be achieved by either using a linear detector (analog
recording) or by employing the method of timecorrelated
single photon counting (TCSPC). At the
ANKA storage ring both methods are in use. The
analogue detection is based on the signal from a
stripline or annular electrode, the TCSPC uses a
Single Photon Avalanche Diode (SPAD). In this
paper, we describe the experimental set-ups and
present results of a comparison of the two
techniques for single as well as for multi bunch
filling patterns. Special emphasis is put on the
response of the individual methods to a large
dynamic range of beam currents and bunch lengths.
Sub Classification: T03 Beam Diagnostics and
Instrumentation
Poster Panel 85
ID: 3929 - TUPC119
A Comprehensive Study of Nanometer
Resolution of the IPBPM, YoungIm Kim,
Hwanbae Park (Kyungpook National University,
Daegu), Yosuke Honda, Ryuhei Sugahara, Toshiaki
Tauchi, Nobuhiro Terunuma, Junji Urakawa (KEK,
Ibaraki), Stewart Takashi Boogert (Royal Holloway,
University of London, Surrey), Josef Frisch,