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Abstracts Brochure - CERN

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TUPCH184<br />

TUPCH185<br />

TUPCH186<br />

TUPCH187<br />

27-Jun-06 16:00 - 18:00 TUPCH — Poster Session<br />

to different particle loss rates and times between NEG regenerations. The results are presented in this paper and<br />

discussed.<br />

Development of a Novel HOM Absorber<br />

N. Kurita, M. Kosovsky, A. Novokhatski, J. Seeman, S.P. Weathersby<br />

(SLAC)<br />

214<br />

A novel HOM absorber module is being developed<br />

for the PEP-II B-factory to help mitigate<br />

HOM’s that are trapped in the vacuum<br />

system. The PEP-II B-factory has achieved<br />

the highest stored ring currents of 3A and at small bunch lengths. These high currents have created a new generation<br />

of problems with HOM heating of machine components. The HOM absorber is planned to be installed early this year<br />

in PEP-II. The mechanical design, fabrication and operational experience will be presented.<br />

Performance and Design of an RF Shielded Bellows with HOM Absorber<br />

The PEP-II RF shielded bellows have been<br />

N. Kurita, M. Kosovsky, A. Novokhatski, S.P. Weathersby (SLAC) operating successfully at high current for 10<br />

years. The bellows module has successfully<br />

maintained RF continuity between mating chambers while allowing for thermal expansion of chambers and manufacturing<br />

tolerances. However, the higher bunch currents and shorter bunch lengths, coupled with chamber aperture<br />

perturbations have led to excessive TE mode power leaking past the shield and heating up the thin welded convolutions.<br />

A new bellows design incorporates absorbing tiles behind the RF shield to absorb this power and keeps the<br />

convolutions from overheating.<br />

Low Level RF System Development for SOLEIL<br />

P. Marchand, M.D. Diop, F. Ribeiro, R.S. Sreedharan (SOLEIL) M.<br />

Luong, O. Piquet (CEA)<br />

The Low Level RF system that is used in the<br />

SOLEIL storage ring consists in fully analog<br />

"slow" amplitude, phase and frequency<br />

loops, complemented with a direct RF feed-<br />

back. A fast digital FPGA-based I/Q feedback, currently under development, will be implemented later on. The<br />

performance of both systems has been evaluated using a Matlab-Simulink-based simulation tool. The computed and<br />

first experimental results are reported.<br />

DSP-based Low Level RF Control as an Integrated Part of DOOCS Control System<br />

V. Ayvazyan, A. Brandt, O. Hensler, G.M. Petrosyan, L.M. Petrosyan,<br />

K. Rehlich, S. Simrock, P. Vetrov (DESY)<br />

The Distributed Object Oriented Control System<br />

(DOOCS) has been developed at DESY<br />

as a control system for TTF/VUV-FEL. The<br />

DSP based low level RF control system is one<br />

of the main subsystems of the linac. Several DOOCS device servers and client applications have been developed to<br />

integrate low level RF control into the TTF/VUV-FEL control system. The DOOCS approach defines each hardware<br />

device as a separate object and this object is represented in a network by a device server, which handles all device

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