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

• Autorzy: Cichalewski W. , Jałmużna W.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

high power amplifiers; klistron; AMAM; AMPM; linearization; digital predistortion; free electron lasers

PL

wzmacniacz wysokiej mocy; klistron; AMAM; AMPM; linearyzacja; lasery na swobodnych elektronach

• Wydawca: Lodz University of Technology. Department of Microelectronics and Computer Science
• Czasopismo: International Journal of Microelectronics and Computer Science
• Rocznik: 2010
• Tom: Vol. 1, nr 1
• Strony: 77--80
• Opis fizyczny: Bibliogr. 5 poz.

Twórcy

autor

Cichalewski W.

autor

Jałmużna W.

• Department of Microelectronics and Computer Science Technical University of Łódź Łódź, Poland,

Bibliografia

• [1] T. Schilcher, "Vector Sum Control of Pulsed Accelerating Fields in Lorentz Force Detuned Superconducting Cavities", PhD Thesis, Hamburg, Germany 1998.
• [2] R. Brinkmann et al. (eds.), "TESLA Technical Design Report - Part II: The Accelerator", DESY 2001-011, pp. II-19, March 2001; http://tesla.desy.de
• [3] P. Garcia, A. Ortega, J. Mingo, A. Valdovinos, "Nonlinear Distortion Cancellation Using LINC Transmitters in OFDM Systems", IEEE Transactions On Broadcasting, Vol. 51, No. 1, March 2005.
• [4] R.I. Bogya, M.E. Magana, "Linear radio frequency power amplifier : design using nonlinear feedback linearization techniques", Vehicular Technology Conference 2004, IEEE 60th Vol. 3, Issue, Sept. 2004, pp. 2259-2263, 2004
• [5] Dong-Hee Jang at all. "Analog predistorter using a Cartesian vector modulator structure", Microwave and Optical Technology Letters, Volume 43, Issue 4 , pp 343 - 348, 2004 Wiley Periodicals, Inc