PSI, Villigen PSI, Switzerland
TU3AB2
PSI, Villigen PSI, Switzerland
PSI, Villigen PSI, Switzerland
PSI, Villigen PSI, Switzerland
| 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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TU3AB2 |
Status of the Transverse Intra Bunch Train Feedback of the European XFEL | |
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| The European XFEL has a transverse Intra Bunch Train Feedback (IBFB) that is able to measure and correct the beam position of each bunch individually by means of cavity beam position monitors (CBPMs) and stripline kicker magnets. The IBFB core system is located between the collimator and the beam distribution kicker system, using two vertical and two horizontal kickers as well as eight nearby CBPMs for an ultra-fast feedback loop. Moreover, it receives data from all undulator BPMs via longer fiber optic cables, thus allowing to correct small beam trajectory perturbations that may occur between the IBFB core systems and the undulators located some 100m downstream. After first lasing has been observed in 5/2017, the IBFB is presently being commissioned with beam. This paper will report on the final design of the IBFB system, FPGA-based data transfer and signal processing concept, as well as on the achieved performance and latest results of the different IBFB subsystems (including CBPMs) and overall system. | ||
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Slides TU3AB2 [4.992 MB] | |
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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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| TUPCF18 | The SwissFEL High-Q Undulator BPM System | 255 |
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| In 10/2016, PSI started the beam commissioning of Aramis, the hard X-ray undulator line of the SwissFEL free electron laser. The injector, linac and transfer line BPMs have 3.3 GHz low-Q cavity BPMs to support 2-bunch operation with 28ns bunch spacing. In contrast, Aramis as well as the future 2nd soft X-ray undulator line called "Athos" are eqipped with 4.9 GHz high-Q cavity BPMs, since the undulators will only be operated with single bunches by means of a fast beam distribution kicker system. The undulator BPM system uses 4.9GHz double-resonator pickups having a nominal loaded-Q of 1000. The associated front-end electronics applies single-stage analog downconversion to a 135 MHz IF frequency, subsampling ADC and digital quadrature downconversion. A detailed description of the BPM pickup and front-end design and signal processing will be given. Laboratory test and calibration methods and results of pickups and electronics will be compared with first beam measurements. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCF18 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |