The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Stadler, M. AU - Keil, B. AU - Marcellini, F. AU - Marinkovic, G. ED - Liu, Zhengzheng ED - Lidia, Steven ED - McCausey, Amy ED - Schaa, Volker RW TI - The SwissFEL High-Q Undulator BPM System J2 - Proc. of IBIC2017, Grand Rapids, MI, USA, 20-24 August 2017 C1 - Grand Rapids, MI, USA T2 - International Beam Instrumentation Conference T3 - 6 LA - english AB - 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. PB - JACoW CP - Geneva, Switzerland SP - 255 EP - 258 KW - ion KW - pick-up KW - FEL KW - undulator KW - electron DA - 2018/03 PY - 2018 SN - 978-3-95450-192-2 DO - 10.18429/JACoW-IBIC2017-TUPCF18 UR - http://jacow.org/ibic2017/papers/tupcf18.pdf ER -