| Paper | Title | Page |
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| TUPCC15 | Design and Commissioning of the Bunch Arrival-Time Monitor for SwissFEL | 182 |
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The Bunch Arrival-Time Monitor for SwissFEL (BAM) is based on the concept, which was successfully tested at the SwissFEL Test Facility [1]. During the gap between the SITF decommissioning and the start of SwissFEL, all key components underwent design improvement. In this paper, we report on these new developments, including the mechanical design of the BAM-Pickup and RF-front end, the electro-optical front end (BAM-Box), the data acquisition front end, the new expert- and user applications. We have developed concepts and tested hardware for Bunch-ID stamping of signals, relevant for the extraction of the arrival-time information. Presently two complete systems are installed and being commissioned at SwissFEL - one in the injector gun and one between the two bunch compressors. We report on the ongoing first commissioning results.
[1] T. Schietinger et al., Commissioning experience and beam physics measurements at SITF, Phys. Rev. Accel. and Beams, 19, 100702 (2016) |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCC15 | |
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| TUPCC17 | Ultra-Stable Fiber-Optic Reference Distribution for SwissFEL C-Band Linacs Based on S-Band Radio-Over-Fiber Links and Frequency Doubler / Power Amplifiers | 189 |
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| The reference distribution for the SwissFEL accelerator is based on ultra-stable Libera Sync 3 fiber-optic links operating at 3 GHz with <2.4fs added timing jitter. While s-band injector RF stations are directly supplied with these actively stabilized reference signals at 2.9988GHz, the same 3 GHz optical links are used to transmit reference signals at 2.856GHz (half c-band frequency) to the c-band LINACs, combined with a frequency doubler-amplifier at the link end. A novel zero AM/PM-conversion frequency-doubler and an amplitude-/phase-controlled power amplifier have been implemented in a compact 1HU 19inch unit. Key design concepts and measurement results will be presented. It will be shown that this inexpensive doubler-amplifier system adds only insignificant jitter and drift to the transmitted reference signals. As the same actively stabilized 3GHz links can be used for s- and c- band RF stations, development of a more expensive 6GHz fiber-optic link could be avoided. A higher quantity of the same link type can thus be manufactured and the number of spares is reduced as only one link type is utilized for the SwissFEL injector and LINAC RF reference signals. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCC17 | |
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