| Paper |
Title |
Page |
| TUPC150 |
Ensemble Cavity Control System Simulation Using Pulse-to-pulse Calibration
|
1422 |
| |
- C. Serrano, L. R. Doolittle, A. Ratti, A. Vaccaro
LBNL, Berkeley, California
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| |
For cost reasons one klystron will supply RF power to multiple cavities in recent projects. Individual cavity field stability and optimal drive needs to be achieved considering beam propagation, cavity tuning, cavity coupling, and cable lengths. External environmental factors continuously modify physical properties of the accelerating structures and waveguides. Therefore a calibration system has been designed to adapt individual drive signals and vector-sum alignment in a pulse-to-pulse basis. An eight-cavity model and a calibration system have been tested in simulation using the hardware-software simulation tool developed at LBNL.
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| TUPC153 |
Hardware-software Simulation for LLRF Control System Development
|
1428 |
| |
- A. Vaccaro, L. R. Doolittle, A. Ratti, C. Serrano
LBNL, Berkeley, California
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Field Programmable Gate Arrays (FPGA) have been used in accelerator controls for a long time. Stricter performance requirements in new accelerator designs force LLRF control systems to continuously improve, and the increasing density of available FPGAs enables such progress. The increased complexity in FPGA design is not always followed by new RF systems availability for development and testing. Therefore, a hardware-software simulation tool has been developed to model RF systems by a software simulator. It simulates the interaction of HDL code that is to be synthesized with both RF systems and communication ports to external controls software, reproducing realistic working conditions of the FPGA. The hardware-software interaction for LLRF control system design is discussed here.
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| THPC159 |
Timing and Event Distribution for FERMI@ELETTRA
|
3363 |
| |
- A. Rohlev, A. O. Borga, G. D'Auria
ELETTRA, Basovizza, Trieste
- L. R. Doolittle, A. Ratti
LBNL, Berkeley, California
- J. Serrano, M. W. Stettler
CERN, Geneva
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| |
FERMI@ELETTRA is a 4th generation light source under construction at Sincrotrone Trieste. It will be operated as a seeded FEL driven by a warm S-band Linac which places very stringent specifications on control of the amplitude and phase of the RF stations. The local clock generation and distribution system at each station will not be based on the phase reference distribution but rather on a separate frequency reference distribution which has significantly less stringent phase stability requirements. This frequency reference will be embedded in the serial data link to each station and has the further advantage of being able to broadcast synchronous machine timing signals with sub-nanosecond temporal accuracy. The phase and amplitude of the phase reference line is measured for each pulse and used to calibrate the other measurements. This paper describes the architecture used to distribute the frequency reference along with the precision machine timing and clocking signals.
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