| 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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| TUPCC16 | Status of the THz Streaking Experiment with Split Ring Resonators at FLUTE | 186 |
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| THz streaking with split ring resonators (SRR) promise ultra-high (sub-femtosecond) temporal resolution even for relativistic electron bunches. A proof-of-principle experiment in collaboration between the University of Bern, the Paul Scherrer Institute (PSI) and the Karlsruhe Institute of Technology (KIT) is currently prepared at the FLUTE facility (Ferninfrarot Linac und Test Experiment) at KIT. Most of the critical components have been designed, tested and set-up in the 7 MeV diagnostics part of FLUTE. In this contribution we will present an update on the experimental set-up and report on SRR configurations which have been optimized for highest THz deflection, while simultaneously accounting for the restrictions of the manufacturing process. Test measurements characterizing the SRR samples and the THz source, which has been matched to the FLUTE gun laser, will also be presented. | ||
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Poster TUPCC16 [0.539 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCC16 | |
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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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WE2AB2 |
A Novel Nanotechnology Based Wire Scanner for Sub-Micrometer Resolution Measurements of the Electron Beam Profile at SwissFEL | |
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| SwissFEL wire-scanners (WSCs) are designed to provide minimally-invasive high resolution measurements of the electron beam profile and emittance during FEL operations. The wire-fork is equipped with two pairs of wires: 5um tungsten wire for high resolution measurements and 12.5 um Al(99):Si(1) wires for routine beam monitoring. The resolution limit is given by the wire diameter, a dimension in turn constrained to few micrometers by the wire manufacturing and mounting technique. An improvement of the WSC spatial resolution was triggered by the requirements for special SwissFEL machine operations and experimental applications where the beam transverse size will be at the sub-micrometer scale. In order to meet the resolution requirements, we make use of nanofabrication of sub-micrometer metallic stripes on a membrane by means of e-beam lithography. This presentation shall focus on the design, fabrication process and characterization of a high-resolution wire scanner prototype consisting of thin gold or nickel stripes with widths ranging from 2um down to 0.4um electroplated on a silicon nitride membrane. First results of the prototype electron beam tests will be also presented. | ||
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Slides WE2AB2 [15.288 MB] | |
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| WEPCC16 | First Experimental Results of the Commissioning of the SwissFEL Wire-Scanners | 388 |
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| Several wire-scanners - 19 out of 22 - are presently installed in SwissFEL, the hard X-ray FEL facility under commissioning at Paul Scherrer Institut (www.psi.ch). Thanks to a wire-fork designed to be equipped with two different pairs of scanning wires (5 um tungsten and 12.5 um Al(99):Si(1)), high resolution measurements of the beam profile - and emittance - and, alternatively, a minimally-invasive beam monitoring during FEL operations can be performed. First experimental results of the SwissFEL wire-scanner commissioning will be presented as well as a summary of the prototyping design and characterization. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-WEPCC16 | |
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