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COMPLEX ENVELOPE CONTROL OF PULSED ACCELERATING FIELDS
CZARSKI T. wydawnictwo: WYD PW , rok wydania 2010, wydanie I cena netto: 35.00 Twoja cena 33,25 zł + 5% vat - dodaj do koszyka Complex Envelope Control of Pulsed Accelerating Fields in Superconducting Cavities
The main objective of the CARE project was to generate a structured and integrated
European area in the field of accelerator research and related R&D. The framework of
CARE has successfully integrated the subjects, the infrastructures and the expertise. The
volume consists of the following chapters: Overview of CARE Project; Electron Linear
Accelerator Network in Europe (ELAN), Beams and European Neutrino Experiments (BENE);
High-energy high-intensity hadron beams (HEHIB); R&D in SRF; Charge production with
photo-injectors (PHIN); High-intensity pulsed photo-injector (HIPPI); Next European dipole
(NED).
A digital control system for superconducting cavities of a linear accelerator is presented
in this work. FPGA (Field Programmable Gate Arrays) based controller, managed by MATLAB,
was developed to investigate a novel firmware implementation. The LLRF - Low Level Radio
Frequency system for FLASH project in DESY is introduced. Essential modeling of a cavity
resonator with signal and power analysis is considered as a key approach to the control
methods. An electrical model is represented by the non-stationary state space equation for
the complex envelope of the cavity voltage driven by the current generator and the beam
loading. The electromechanical model of the superconducting cavity resonator including the
Lorentz force detuning has been developed for a simulation purpose. The digital signal
processing is proposed for the field vector detection. The field vector sum control is
considered for multiple cavities driven by one klystron. An algebraic, complex domain
model is proposed for the system analysis. The calibration procedure of a signal path is
considered for a multi-channel control. Identification of the system parameters is carried
out by the least squares method application. The FPGA based controller executes a
procedure according to the following prearranged control tables: Feed-Forward, Set-Point
and Gain. The control tables are determined for the required cavity performance, according
to the recognized process. Nonlinearities and deterministic disturbances are compensated
by the feed-forward table for the open loop operation. The closed loop correction for the
feed-back mode is performed by the complex gain of the corrector table. The adaptive
control algorithm is applied for the feed-forward and feedback modes according to the
recognized process. The presented method is useful for the repetitive, deterministic
condition. It has been verified experimentally in the case of a pulsed mode of an
accelerator operation. Experimental results, based on the field measurement, are presented
for a cavity representative operation. The results of the project accomplishment can be
presented and used physically by driving the real cavity module according to the given
control algorithm.
162 pages, Paperback
Po otrzymaniu zamówienia poinformujemy, czy wybrany tytuł polskojęzyczny lub
anglojęzyczny jest aktualnie na półce księgarni.
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