-
[show abstract]
[hide abstract]
ABSTRACT: In the RF system for FLASH (free electron laser in Hamburg) linear accelerator each klystron supplies RF power to up to 32 cavities. The superconducting cavities are operated in pulsed mode and high accelerating gradients close to the performance limit. The RF control of the cavity fields to the level of 10" for amplitude and 0.1 degree for phase however presents a significant technical challenge due to the narrow bandwidth of the cavities which results in high sensitivity to perturbations of the resonance frequency by mechanical vibrations (microphonics) and Lorenz force detuning FLASH linac RF control system employs a completely digital feedback system to provide flexibility in the control algorithms, precise calibration of the accelerating field vector-sum, and extensive diagnostics and exception handling capabilities. The RF control algorithm is implemented in DSP (digital signal processor) firmware and DOOCS (distributed object oriented control system) servers. The RF control system design objectives are discussed Hardware and software design of the DSP based RF control are presented.
EUROCON, 2007. The International Conference on "Computer as a Tool"; 10/2007
-
[show abstract]
[hide abstract]
ABSTRACT: In the RF system for the Vacuum Ultraviolet Free Electron Laser (VUV-FEL) Linac each klystron supplies RF power to up to 32 cavities. The superconducting cavities are oper ated in pulsed mode and high accelerating gradients close to the performance limit. The RF control of the cavity fields to the level of 10<sup>-4</sup>for amplitude and 0.1 degree for phase however presents a significant technical chal lenge due to the narrow bandwidth of the cavities which re sults in high sensitivity to perturbations of the resonance frequency by mechanical vibrations (microphonics) and Lorentz force detuning. A digital RF control system has been developed for the VUV-FEL which will demonstrate the required control performance. Presently the Linac is being commissioned, and this effort provides the first full integrated test in the accelerator, including cryogenics, RF, beam transport, and beam diagnostics. The RF control sys tem design and objectives are discussed.
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
-
Workshop on Personal Computers and Particle Accelerator Controls,Ljubljana,Slovenia (2008),162.
-
K. Rehlich,
DESY Maschinenphysik,
IEEE Nuclear Science Symposium Dresden NSS Germany,
A. Aghababyan,
P. Göttlicher,
G. Petrosyan,
L. Petrosyan,
V. Petrosyan,
P Smirnov, P. Vetrov,
M Zimmer
