Abstracts Brochure - CERN

TUPCH097
TUPCH098
TUPCH099
TUPCH100
27-Jun-06 16:00 - 18:00 TUPCH — Poster Session
Construction and Instrumentation of a Remote Operation Beam Dynamics Laboratory
R. Holtzapple, W.P.E. Edson, P.J.S. Stonaha (Alfred University) B.
Cerio (Colgate University)
188
A remote operation beam dynamics laboratory
is being constructed at the Laboratory
of Elementary Particle Physics (LEPP) at Cornell
University that can be operated at Alfred
University. Presently the laboratory is equipped with a streak camera for longitudinal dynamics measurements on
CESR. In the future single bunch transverse dynamics measurements will be made using two 2ns gated cameras. In
this paper a description of the remote operation of the laboratory is presented as well as its future plans.
Antiproton Momentum Distributions as a Measure of Electron Cooling Force at the Fermilab
Recycler
The Fermilab Recycler is a fixed 8GeV kinetic
D.R. Broemmelsiek, S. Nagaitsev (Fermilab)
energy storage ring located in the Fermilab
Main Injector tunnel near the ceiling. Electron
cooling of high-energy antiprotons has recently been demonstrated at the Recycler. Antiproton beam Schottky
signals were used to measure the antiproton momentum distribution at equilibrium between a calibrated broadband
diffusion source and electron cooling. The large Recycler momentum aperture, the dependence of the electron cooling
force as a function of the antiproton momentum deviation and the calibrated diffusion source combine to give a
unique spectral measurement of the antiproton momentum beam distribution.
Development of HOM Damped Copper Cavity for the ESRF
At the ESRF, HOM driven longitudinal cou-
N. Guillotin, J. Jacob, V. Serriere (ESRF)
pled bunch instabilities are currently avoided
up to the nominal beam current of 200 mA
by precisely controlling the cavity temperatures and thereby the HOM frequencies of the existing five-cell copper
cavities. A bunch-by-bunch feedback is presently being commissioned in order to increase the maximum stored
current. In parallel, normal conducting strongly HOM damped cavities are under study to possibly replace the fivecell
cavities. The design is based on a scaling of the single cell EU cavity*: a pillbox geometry with nose cones and
three attached ridged waveguides loaded by ferrites for effective HOM damping. We report on the electromagnetic
simulation making use of the 3D codes HFSS and GdfidL. They allowed optimizing the shape of both cavity and
dampers, including electromagnetic absorbing material with frequency dependent parameters.
*E. Weihreter et al. A Ridged Circular Waveguide Ferrite Load for Cavity HOM Damping, this conference.
Fiberoptics-based Instrumentation for Storage Ring Longitudinal Diagnostics
S. De Santis, J.M. Byrd, M.S. Zolotorev (LBNL) Y. Yin (Y.Y. Labs,
Inc.)
Many beam diagnostic devices in today’s
synchrotron rings make use of the radiation
emitted by the circulating particles. Such instruments
are placed in close proximity of
the accelerator, where in many instances they cannot be easily accessed for safety consideration, or at the end of a
beamline, which because of its cost, can only move the light port a few meters away from the ring. We present a study