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High power amplifiers chain nonlinearity influence on the acelerating beam stability in free electron laser (FLASH)

100%

Cichalewski W. , Jałmużna W.

tom Vol. 1, nr 1

77-80

The high power amplifiers transfer characteristics nonlinearities can have a negative influence on the overall system performance. This is also true for the TESLA superconducting cavities accelerating field parameters control systems. This Low Level Radio Frequency control systems uses microwave high power amplifiers (like 10 MW klystrons) as actuators in the mentioned feedback loops. The amplitude compression and phase deviations phenomena introduced to the control signals can reduce the feedback performance and cause electron beam energy instabilities. The transfer characteristics deviations in the Free Electron Laser in Hamburg experiment have been investigated. The outcome of this study together with the description of the developed linearization method based on the digital predistortion approach have been described in this paper. Additionally, the results from the linearization tool performance tests in the FLASH's RF systems have been placed.

Multipurpose RF field vector controller for linear accelerators

80%

Jałmużna W. , Cichalewski W. , Szewiński J.

tom Vol. 1, nr 1

89-94

The paper describes the design and the implementation of the flexible, multipurpose RF (Radio Frequency) field Vector Controller for the linear accelerators based on the superconducting technology. The implementation is done for the FPGA (Field Programmable Gate Array) based LLRF (Low Level Radio Frequency) control systems. The full process of the requirement analysis and the library implementation is presented. It is followed by the description of the controller's applications and the results of the performance tests. The controller fulfills the requirements of the various accelerator facilities and hardware platforms and can be easily adapted for the planned experiments to decrease their cost by avoiding expensive research and development phase.

Przegląd prac Politechniki Łódzkiej realizowanych w programie CARE

51%

Napieralski A. , Grecki M. , Sękalski P. , Makowski D. , Wójtowski M. , Cichalewski W. , Kosęda B. , Świercz B.

tom Vol. 46, nr 2-3

78-79