Wyniki wyszukiwania - BazTech

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Układy Virtex i Spartan w systemach kompensacji sił Lorentza w akceleratorach

Przygoda K., Poźniak T.

Pomiary Automatyka Kontrola

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2011

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R. 57, nr 8

917-919

PL

Artykuł opisuje system sterujący czterdziestoma torami kompensującymi w akceleratorze FLASH. System zbudowano w oparciu o układy z rodziny Virtex i Spartan firmy Xilinx. W układach reprogramowalnych zaimplementowano niezbędne algorytmy sterowania. System kompensacji został wykorzystany do wspierania wybranych eksperymentów wysokich energii. Przedstawione wyniki pokazują poprawność przyjętych rozwiązań. Uzyskane rezultaty pozwoliły na obniżenie mocy dostarczanej do akceleratora rzędu 0,5 MW.

EN

During pulse operation of a linear accelerator (LINAC), cavities are Lorentz force detuned from its main resonance frequency of 1.3 GHz. The detuned cavities need more radio frequency (RF) control efforts to achieve the desired Free Electron Laser (FEL) parameters. Fast frequency tuners based on piezoelectric elements are commonly used for compensation of cavity detuning. The piezo control system specification and its prototype design are presented in RUC 2008 [2]. The achieved results allow designing a completely new system dedicated for a FLASH accelerator (see Fig. 1). The system digital part was designed with use of FPGA devices of Virtex and Spartan families. The control algorithms were implemented inside FPGA ( Fig. 4). Correction signals generated by the digital system are converted by DAC units and next used to drive piezoelectric actua-tors with dedicated power amplifiers. This paper presents the Lorentz force detuning compensation system used to control forty cavities equipped with fast frequency tuners for the Deutsches Elektronen Synchrotron (DESY) FLASH accelerator. The obtained results show the correctness of the chosen solutions. The applied compensation allow decreasing RF control power of 0.5 MW together with significant increase in the accelerating field gradient (Fig. 6).

2

System for monitoring and compensation of superconducting resonant cavities detuning with piezoelectric elements

Przygoda K., Poźniak T., Napieralski A., Grecki M.

Prace Naukowe Politechniki Śląskiej. Elektryka

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2010

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z. 1

23-33

EN

The paper presents mechatronic system for compensation and monitoring of superconducting resonant cavities detuning with piezoelectric elements. This system was installed and connected to all available piezo tuners in FLASH accelerator in research center of Hamburg. Moreover, the monitoring part of the system was used to measure signals from piezo tuner frames operated as sensors. The first data analysis and analytical fitting of derived transfer functions are briefly summarized.

PL

W artykule opisano system mechatroniczny do kompensacji i monitorowania odstrojenia rezonansowych wnęk nadprzewodzących z wykorzystaniem elementów piezoelektrycznych. System został zainstalowany i podłączony do piezoelektrycznych elementów wykonawczych wykorzystywanych w akceleratorze FLASH w ośrodku badawczym Deutsches Elektronen-Synchrotron (DESY) w Hamburgu. Ponadto, część monitorująca systemu została wykorzystana do pomiaru sygnałów odczytanych z czujników piezoelektrycznych. Zaprezentowano pierwsze wyniki analiz oraz modelowania uzyskanych funkcji przejścia systemu.

3

Power supply unit for ATCA-based piezo compensation system

Przygoda K., Poźniak T., Makowski D., Kozak T., Wiśniewski M., Napieralski A., Grecki M.

International Journal of Microelectronics and Computer Science

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2010

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Vol. 1, nr 2

205-210

EN

Pulsed operation of high gradient superconducting radio frequency (SCRF) cavities results in dynamic Lorentz force detuning (LFD) approaching or exceeding the bandwidth of the cavity of order of hundred of Hz. The resulting modulation of the resonance frequency of the cavity is leading to a perturbation of the amplitude and phase of the accelerating field, which can be controlled only at the expense of RF power |1-3|. The X-Ray Free Electron Laser (X-FEL) accelerator, which is now under development in Deutsches Elektro wen-Synchrotron (DESY), will consists of around 800 cavities with a fast tuner fixture including the actuator / sensor configuration. Therefore, it is necessary to design a distributed control system which could be able to supervise around 25 RF stations, each one comprised of 32 cavities. The Advanced Telecommunications Computing Architecture (ATCA) was chosen to design, develop, and build a Low Level Radio Frequency (LLRF) controller for X-FEL. The already performed tests of ATCA LLRF control system proofed the possibilities of usage of such a standard for high energy physics experiments |4|. The paper presents the concept of integration of the piezo compensation system to the ATCA standards with special emphasis to the hardware part of the system. Moreover, the first results from carried out tests of the prototype power supply unit for piezo drivers integrated to ATCA board will be presented.