Description
Authors of posters are expected to be available next to their posters during this time to discuss and explain their work.
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Dayle Kotturi (SLAC)11/10/2005, 09:50posterThe 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...Go to contribution page
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Dr Harald Klingbeil (GSI RF Department)11/10/2005, 09:53posterA 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...Go to contribution page
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Mr Massamba Diop (Synchrotron SOLEIL), Mr Michel Luong (CEA Saclay)11/10/2005, 09:56posterAn 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...Go to contribution page
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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, 09:59posterWithin 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...Go to contribution page
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Mr CHRISTOPHE JOLY (IN2P3-CNRS IPNO Orsay)11/10/2005, 10:02posterWithin 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...Go to contribution page
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Mr Toshihiro MATSUMOTO (KEK)11/10/2005, 10:05posterAt 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...Go to contribution page
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Mr Fernand RIBEIRO (SYNCHROTRON-SOLEIL)11/10/2005, 10:08posterIn 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...Go to contribution page
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Mr Uros Mavric (Instrumentation Technologies)11/10/2005, 10:11posterLibera 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...Go to contribution page
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Dr Bernhard Zipfel (FH-Fulda / GSI)11/10/2005, 10:14posterAt 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...Go to contribution page
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Mr Michael Laverty (TRIUMF)11/10/2005, 10:17posterAn 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...Go to contribution page
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Mr Maurice Piller (Spallation Neutron Source)11/10/2005, 10:20posterThe 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...Go to contribution page
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Mr Wojciech Giergusiewicz (Warsaw University of Technology faculty of Electronics and Information Technology)11/10/2005, 10:23posterHardware 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...Go to contribution page
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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, 10:26posterAs 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...Go to contribution page
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Mr Sungil Kwon (LANL)11/10/2005, 10:32posterThis 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...Go to contribution page
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Mr Dariusz MAKOWSKI (Department of Microelectronics and Computer Science, Technical University)11/10/2005, 10:35posterRadiation 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....Go to contribution page
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Mr Doug Horan (Argonne National Laboratory)11/10/2005, 10:38posterThe 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.Go to contribution page