Abstracts Brochure - CERN

THPCH094
THPCH095
THPCH096
29-Jun-06 16:00 - 18:00 THPCH — Poster Session
Fully Digitized Synchronizing and Orbit Feed-back Control System in the KEK Induction
Synchrotron
A concept of "Induction Synchrotron", where
K. Torikai, Y. Arakida, Y. Shimosaki, K. Takayama (KEK)
an extremely long bunch captured by the step
barrier-voltages is accelerated with the induction
accelerating voltage, is being to be fully demonstrated in the KEK 12GeV-PS for the first time*. Attractive
applications of the induction synchrotron are such as higher intensity proton drivers, future high luminosity hadron
colliders with superbunch, and arbitral-ion accelerators. Synchronization between the voltage-pulse generation and
the beam circulation, accelerating voltage control, and beam-orbit control without beam-rf phase, which is analogous
to Delta-R feedback in an RF synchrotron, are indispensable in the induction synchrotron. A fully digitized real-time
pulse density and discrete timing control system with 1GHz DSPs has been newly developed. Notable characteristics
of the control system, some of which are synchronization at 1MHz revolution frequency with 8ns timing accuracy,
are explained in detail. Experimental results of the induction acceleration with the digital orbit controller are also
presented in this paper.
*K. Torikai et al. "Acceleration and Confinement of a Proton Bunch with the Induction Acceleration System in the
KEK Proton Synchrotron", submitted to Phys.Rev.ST-AB(2005), KEK-Preprint 2005-80.
Transverse Damping System at SIS100
V. Zhabitsky, E. Gorbachev, N.I. Lebedev (JINR) U. Blell, P.J. Spiller
(GSI)
414
The basic concept and main design features
of the transverse damping system at the
SIS100 synchrotron are presented. SIS100
with five times the circumference of the cur-
rent SIS18 accelerator is a part of the Facility for Antiproton and Ion Research (FAIR) which is the next accelerator
complex being constructed on the GSI site. The existing GSI accelerators serve as injector for SIS100. The SIS100
synchrotron will provide ion beams of high intensities which can lead to transversal and longitudinal beam instabilities.
In order to damp the coherent transverse beam oscillations, a transverse feedback system (TFS) is going to be
implemented in SIS100. The TFS presented is a feedback with a real-time digital signal processing for damping of
transverse injection oscillations, feedback curing transverse coupled bunch instabilities, and excitation of transverse
oscillations for beam measurements and other applications. The data on the bandwidth and gain of the TFS as well
as the general description of the central processing unit are presented.
An Intra Bunch Train Feedback System for the European XFEL
V. Schlott, M. Dehler, B. Keil, R. Kramert, A. Lounine, G.
Marinkovic, P. Pollet, T. Schilcher, P. Spuhler, D.M. Treyer (PSI)
After joining the preparatory phase of the
European X-FEL project, the Paul Scherrer
Institut (PSI) agreed in taking over responsibility
for electron beam stabilization by de-
veloping a fast intra bunch train feedback (IBFB) system, which will be tested in its prototype version at the VUV-FEL
facility at DESY. The IBFB will make use of the long bunch trains provided by the superconducting drive accelerators
of the VUV- as well as the European X-FEL allowing to damp beam motions in a frequency range of a few kHz up
to several hundreds of kHz applying modern control algorithms in a feedback loop. The FPGA-based, digital data
processing and the low latency time (preferably < 200 ns) permit the elimination of long range (from bunch train to