Abstracts Brochure - CERN

TUPCH — Poster Session 27-Jun-06 16:00 - 18:00
on the coupling of synchrotron light into an optical fiber for all those application where the longitudinal properties
of the beam are measured (i.e., bunch length, phase, intensity, etc.). By choosing an appropriate fiber it is possible
to keep attenuation and dispersion at negligible values over a large bandwidth, so that this method would allow
to have the diagnostic instruments directly in the control room, or wherever convenient, up to several hundred of
meters away from the tunnel. This would make maintaining and replacing instruments, or switching between them,
possible without any access to restricted areas. Additionally, the few components required to be near the ring (lenses
and couplers) in order to couple the light into the fiber are intrinsically radiation-hard.
Modeling of Ultrafast Streak Cameras
We present progress on modeling of streak
camera with application to measurement of
ultrafast phenomena. Our approach is based
on treating the streak camera as a photocath-
G. Huang, J.M. Byrd, J. Feng, H.A. Padmore, J. Qiang, W. Wan
(LBNL)
ode gun and applying modeling tools for beam optics, space charge, and electromagnetic fields. We use these models
to compare with experimental results from a streak camera developed at the Advanced Light Source. Furthermore,
we explore several ideas for achieving sub-100 fsec resolution.
New Development on Single-shot Fiber Scope
New development has been done to reduce
the noise and improve the stability of the sin- Y. Yin, X. Che (Y.Y. Labs, Inc.)
gle-shot fiber scope, which used an optical
fiber recirculating delay line to regenerate the single-shot very short electrical pulse, so a sampling scope can recover
the original signal. New measurements have been done and will be reported.
Studies Using a Multibunch Turn-by-turn Vertical Beam Profile Monitor in CESR
A fast vertical beam profile monitor has been
implemented at the Cornell Electron Storage
Ring (CESR). Readout is based on the Hamamatsu
H7260K multianode photomultiplier.
This device has a 32 channel linear anode ar-
M.A. Palmer, D.L. Hartill (Cornell University, Laboratory for Elementary-Particle
Physics) M.G. Billing, E. Tanke (CESR-LEPP) M.E.
Watkins (CMU)
ray with 1 mm channel pitch and sub-nanosecond rise time. It provides the ability to probe individual bunches which
are separated by 14 ns within the trains in CESR. A custom 72 MHz digitizer unit allows synchronous multibunch
and turn-by-turn data acquisition. An on-board digital signal processor provides local data processing capability.
This system provides the capability to probe a range of single bunch and multibunch beam dynamics issues as well
as machine stability issues. We describe several measurements that have been recently obtained.
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