Abstracts Brochure - CERN

TUPCH — Poster Session 27-Jun-06 16:00 - 18:00
A Wideband Intercepting Probe for the TRIUMF Cyclotron
An intercepting probe for the TRIUMF cyclotron
capable of measuring the phase and
time structure of the circulating beam was
designed, manufactured, installed into the
V.A. Verzilov, D. Cameron, D.T. Gray, S. Kellogg, M. Minato, W.R.
Rawnsley (TRIUMF)
tank and tested. A model of the probe head in the form of a 50 Ohm parallel plate transmission line was developed
and simulated to operate up to 2 GHz. Thermal simulations show that the probe can withstand at least 500 nA of
average current for the 500 MeV beam. In laboratory tests the probe demonstrated a bandwidth in excess of 1 GHz.
The probe was mounted on a 3 m long drive and is capable of travelling over 0.5 m at an angle of 27 degree w.r.t.
the cyclotron radius. The signals extracted from the probe are processed by a pair of diplexers, where low frequency
and high frequency components are separated. The low frequency signal is directed to our standard electronics for
processing and provides both dc current and a time of flight signal with a rise time of about 100 ns. At the high
frequency output a signal-to-noise ratio of about 4 at 250 nA average current and 0.1 % duty cycle was measured in
the presence of rf background from the cyclotron resonators. A bunch time structure as short as 1 ns was resolved.
High Resolution BPM for the Linear Colliders
The beam-based alignment and feedback
systems which are essential for the operation C. Simon, S. Chel, M. Luong, O. Napoly, J. Novo, D. Roudier (CEA)
of the future colliders use some high resolution
Beam Position Monitors (BPM). In the framework of CARE/SRF, the task of CEA/DSM/DAPNIA (Saclay) is the
design, the fabrication and the beam test of a BPM in collaboration with DESY. This system is composed of a RF reentrant
cavity with a beam pipe radius of 78mm and an analog electronics having several signal processing steps
to reject the monopole mode. Thanks to its high position resolution (better than 1µm) and its high time-resolution
(around 10ns), it is a candidate for the X-FEL at DESY and the ILC. Indeed the chosen coupling allows the bunch to
bunch measurement and the separation between the monopole and dipole modes. Moreover, this BPM is designed
to be used in a clean environment, at the cryogenic and room temperatures.
Performances of the SOLEIL BPM System Based on Switched-electrodes Digital Electronics
SOLEIL, a new synchrotron light source built
near Paris in France, is pioneering a new
high resolution electron Beam Position Monitor
(BPM) system to achieve stability of the
J.-C. Denard, L. Cassinari, N. Hubert, N.L. Leclercq, D. Pedeau
(SOLEIL)
beams at the micron level, as required for the beamlines. The same BPM system allows also measurement of the
beam position in turn-by-turn mode for various machine physics studies. The system combines the high stability
characteristic of multiplexed input channels and the flexibility of a digital system. Instrumentation Technologies
developed the Libera module upon SOLEIL proposals and requirements. The performances of the system evaluated
after the Booster and the storage ring commissioning will be presented.
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