Description
Authors of posters are expected to be available next to their posters during this time to discuss and explain their work.
Dayle Kotturi
(SLAC)
11/10/2005, 09:50
poster
The Linac Coherent Light Source (LCLS) project [1] at SLAC uses a dense 15 GeV
electron beam passing through a long undulator to generate extremely bright x-rays
at 1.5 angstroms. The project requires electron bunches with a nominal peak current
of 3.5kA and bunch lengths of 0.020mm (70fs). The RF stability required by the
bunch
compressors is tighter than what is currently required...
Dr
Harald Klingbeil
(GSI RF Department)
11/10/2005, 09:53
poster
A cavity synchronization system has been realized which allows the synchronization
of the gap signals
of different cavities. The system is designed in such a way that the cavities may
run at different
harmonics. In future it will also be possible to synchronize the cavity with the
beam, i.e. to realize
closed-loop beam phase control.
In order to fulfill these requirements, the...
Mr
Massamba Diop
(Synchrotron SOLEIL), Mr
Michel Luong
(CEA Saclay)
11/10/2005, 09:56
poster
An analysis of beam stability in the SOLEIL synchrotron with two different basic
systems (direct and amplitude/phase feedback) was carried out during the preliminary
design phase in 1999. Since then, on the one hand, the beam energy was pushed from
2.5 GeV to 2.75 GeV, which led to a change of several other machine parameters such
as the harmonic number, accelerating voltage, relative beam...
Mr
CHRISTOPHE JOLY
(CNRS/IN2P3 IPN Orsay), Mr
HERVE LEBBOLO
(CNRS/IN2P3 LPHNE Paris), Mr
JEAN-FRANCOIS GENAT
(CNRS/IN2P3 LPHNE Paris), Mr
JEAN-LUC BIARROTTE
(CNRS/IN2P3 IPN Orsay), Mr
OLIVIER LE DORTZ
(CNRS/IN2P3 LPHNE Paris)
11/10/2005, 09:59
poster
Within the framework of the current European research programs
EUROTRANS and EURISOL on High Intensity Proton Accelerators, and
particularly on the R&D on superconducting SPOKE cavities, a Low Level
Radio Frequency Digital system is developed at IPN Orsay in
collaboration with LPNHE Paris, both IN2P3-CNRS laboratories.
Due to Lorentz's forces, mechanical vibrations or RF power...
Mr
CHRISTOPHE JOLY
(IN2P3-CNRS IPNO Orsay)
11/10/2005, 10:02
poster
Within the framework of European research programs on High Intensity Proton
Accelerator, IPHI (High Intensity Proton Injector) is a 3MeV 100mA CW proton
injector
prototype. It consists of the SILHI ECR source (100keV), a 3MeV Radio Frequency
Quadrupole (RFQ) and a high energy beam line for beam quality analysis. Two 352MHz
klystrons inject 1200kW RF power into the RFQ.
The Low Level...
Mr
Toshihiro MATSUMOTO
(KEK)
11/10/2005, 10:05
poster
At the electron linac of KEK-STF (Superconducting RF Test Facility), an accelerating
electric field of ±0.1% in amplitude and ±0.1degree in phase is required for
Low-Level RF (LLRF) system. Digital feedback (FB) system is adopted for flexibility
of the FB and feedforward (FF) algorism implementation to accomplish these
requirements. In order to carry out the efficient testing of the...
Mr
Fernand RIBEIRO
(SYNCHROTRON-SOLEIL)
11/10/2005, 10:08
poster
In the SOLEIL storage ring, two cryomodules, each containing a pair of 352 MHz
superconducting cavities, will provide the maximum power of 600 kW, required at the
nominal energy of 2.75 GeV with the full beam current of 500 mA and all the
insertion
devices. They will be supplied with liquid helium from a single cryogenic plant and
each of the four cavities will be powered with a 190 kW...
Mr
Uros Mavric
(Instrumentation Technologies)
11/10/2005, 10:11
poster
Libera is a product family targeting instrumentation and controls applications on
particle accelerators. So far three members have been introduced and very well
accepted by the accelerator community. Libera's hardware architecture presents a
universal platform that has all the hardware interfaces to convert signals from
analog to digital and vice versa. In between there is a big FPGA...
Dr
Bernhard Zipfel
(FH-Fulda / GSI)
11/10/2005, 10:14
poster
At GSI a closed loop beam phase control is planned, which will be used to damp
coherent dipole oscillations of particle bunches. The system is based on a DSP
System for high-precision phase and amplitude detection, which was also developed
at GSI based on commercial DSP, ADC and DAC modules and is also applied for cavity
synchronisation.
A special digital filter with variable pass...
Mr
Michael Laverty
(TRIUMF)
11/10/2005, 10:17
poster
An optimized digital phase detector for a 106 MHz superconducting cavity was
designed using state machine logic. Transitions of the feedback and reference
inputs trigger corresponding changes in the state of the detector. The state
machine has been implemented using a high speed Xilinx field programmable gate
array. The resulting design incorporates two phase detectors (one for the...
Mr
Maurice Piller
(Spallation Neutron Source)
11/10/2005, 10:20
poster
The Spallation Neutron Source (SNS) low-level RF (LLRF) control system currently
utilizes separate channels to process 50 MHz down-converted pulsed Cavity IF and CW
Reference IF signals. A new scheme creates pulsed Reference RF signals which are
multiplexed with pulsed Cavity RF signals near the front-end and linear accelerator
(linac) RF cavity structures. The multiplexed pulsed RF...
Mr
Wojciech Giergusiewicz
(Warsaw University of Technology faculty of Electronics and Information Technology)
11/10/2005, 10:23
poster
Hardware development status for DESY UV-FEL were presented. The SIMCON stands for
the microwave, resonant, superconductive accelerator cavity simulator and
controller (embracing the hardware and software layers). The current version of the
SIMCON is 3.1 which is a considerable step forward from the previous 8-channel
version 3.0 which was released at the beginning of 2005 and was made...
34.
The on-line nonliearities measurements of the VUV-FEL accelerator RF- stations high power chain.
Mr
Wojciech Cichalewski
(Technical University of Lodz)
11/10/2005, 10:26
poster
As every high power amplifier also the pulse microwave 10 MW klystrons (in the VUV-
FEL accelerator) have nonlinear output power vs. input power characteristic near to
the device saturation point. This undesirable behavior of the tube amplifier may
cause lower efficiency of the close loop RF field regulation in LLRF control
system.
In order to provide a solution for existing...
Mr
Sungil Kwon
(LANL)
11/10/2005, 10:32
poster
This paper addresses the system identification and the decoupling PI controller
design for a normal conducting RF cavity. Based on the open loop measurement data
of an SNS DTL cavity, the open loop system’s bandwidths and loop time delays are
estimated by using batched least square. With the identified system, a PI
controller is designed in such a way that it suppresses the time...
Mr
Dariusz MAKOWSKI
(Department of Microelectronics and Computer Science, Technical University)
11/10/2005, 10:35
poster
Radiation present in an accelerator poses a real threat to electronic
devices and systems placed in the main tunnel. Radiation in the
accelerator tunnel is produced as a result of the electron beam's
interaction with high-Z materials. Because of the Total Ionizing Dose
effect gamma radiation is responsible for a long term degradation of all
devices installed in the accelerator's chamber....
Mr
Doug Horan
(Argonne National Laboratory)
11/10/2005, 10:38
poster
The status and performance of the 350MHz low-level rf systems and hardware used at
the Advanced Photon Source will be presented. Technical descriptions of how this
hardware is utilized to provide rf control include rf source generation and
distribution, cavity resonance, gap voltage amplitude and phase control, and
parallel-klystron operation.
