| Paper |
Title |
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| MOYPLM2 |
SRF Operation at XFEL: Lessons Learned After More Than One Year |
12 |
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- D. Kostin, V. Ayvazyan, J. Branlard, W. Decking, L. Lilje, M. Omet, T. Schnautz, E. Vogel, N. Walker
DESY, Hamburg, Germany
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The European XFEL is the largest high-field SRF installation in the world and has now been in operation more than a year. It serves as a "prototype" for other facilities being constructed or in the planning stages. Performance of the operation of the SRF system over this period of time and the lessons learned will be discussed.
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Slides MOYPLM2 [4.351 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2019-MOYPLM2
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| About • |
paper received ※ 10 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019 |
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| THYPLS1 |
RF Controls Towards Femtosecond and Attosecond Precision |
3414 |
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- F. Ludwig, J. Branlard, Ł. Butkowski, M.K. Czwalinna, M. Hierholzer, M. Hoffmann, M. Killenberg, T. Lamb, J. Marjanovic, U. Mavrič, J.M. Müller, S. Pfeiffer, H. Schlarb, Ch. Schmidt, L. Springer
DESY, Hamburg, Germany
- M. Kuntzsch, K. Zenker
HZDR, Dresden, Germany
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In the past two decades, RF controls have improved by two orders in magnitude achieving meanwhile sub-10 fs phase stabilities and 10-4 amplitude precision. Advances are through improved field detection methods and massive usage of digital signal procession on very powerful field programmable gate arrays (FPGAs). The question rise, what can be achieved in the next 10 years? In this talk, a review is given of existing systems and strategies, current stability limitations of RF control system and new technologies with the potential to achieve attosecond resolutions.
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Slides THYPLS1 [10.328 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2019-THYPLS1
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| About • |
paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019 |
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| THPRB024 |
Piezo Controls For The European XFEL |
3856 |
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- K.P. Przygoda, J. Branlard, Ł. Butkowski, M.K. Grecki, M. Hierholzer, M. Omet, H. Schlarb
DESY, Hamburg, Germany
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The European X-Ray Free Electron Laser (E-XFEL) accelerator is a pulse machine. The typical time duration of a radio frequency (RF) pulse is about 1.3 ms. The RF power transmitted to the superconducting RF (SCRF) cavity as a set of successive pulses (10 Hz repetition rate), causes strong mechanical stresses inside the cavity. The mechanical deformations of the RF cavity are typically caused by the Lorentz force detuning (LFD). The cavity can be tuned to a 1.3 GHz resonance frequency during the RF pulse using fast piezo tuners. Since the E-XFEL will use around 800 cavities (each cavity with double piezos), a distributed architecture with multi-channel digital and analog control circuits seems to be essential. The most sought-after issue is high-voltage, high-current piezo driving circuit dedicated to multi-channel configuration. The driving electronics should allow a maximum piezo protection against any kind of failure. The careful automation of the piezo tuners control and its demonstration for the high gradient conditions a real challenge. The first demonstration of piezo controls applied for chosen RF stations of the E-XFEL linear accelerator (linac) are presented and obtained results are briefly discussed within this paper.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB024
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| About • |
paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019 |
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