| Paper | Title | Page |
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| MOPWC03 | Commissioning Results and First Operational Experience with SwissFEL Diagnostics | 104 |
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| SwissFEL is a free electron laser user facility at the Paul Scherrer Institute in Villigen, Switzerland designed to provide FEL radiation at photon energies ranging from 0.2 to 12 keV. Beam commissioning of the hard x-ray line ARAMIS has started in October 2016 and lasing at 300 eV was achieved in May 2017. First pilot user experiments at photon energies ≥ 2 keV are foreseen for the end of 2017. This contribution comprehends commissioning results and first operational experience of various diagnostics systems, such as beam position monitors, charge and loss monitors as well as transverse profile measurements with screens, wire scanners and synchrotron radiation monitors. It also provides information about sliced beam parameters using a transverse deflector and shows first results from the BC-1 compression monitor and measurements with the electron bunch arrival time monitors. | ||
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Poster MOPWC03 [1.088 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-MOPWC03 | |
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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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| TUPCF17 | First Beam Commissioning Experience With The SwissFEL Cavity BPM System | 251 |
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| SwissFEL is free electron laser facility designed to produce FEL radiation at wavelengths from 0.1 to 5 nm. The beam commissioning of the hard X-ray undulator line ("Aramis") started 10/2016, and first lasing was observed in 12/2016. Presently, a 2nd undulator line ("Athos") for soft X-rays is being constructed, with 1st beam scheduled for mid 2019. In the injector, linac and beam transfer lines, 95 low-Q cavity BPMs operating at 3.3 GHz are used that were designed to support the future two-bunch operation mode with 28 ns bunch spacing and 100 Hz repetition rate. The undulator lines will only be operated with single bunches by means of a fast beam distribution kicker system, and were thus equipped with high-Q cavity BPMs operating at 4.9 GHz. The BPMs are not only used for beam trajectory optimization, but e.g. also for beam energy measurements (using standard cavity BPMs in the bunch compressors and beam dumps), beam charge and transmission measurements, or improvement of the performance of other monitors (e.g. wire scanners for profile measurement). This paper will report first operation experience with the BPM system, including a performance comparison of low-Q and high-Q BPMs. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCF17 | |
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