S-band Traveling-Wave Deflecting Structures for the PAL-XFEL
Tóm tắt
We designed a 20-MV S-band traveling-wave deflecting structure to measure the bunch length of the electron beams for the PAL-XFEL. Since the start of commissioning of all RF systems of the PAL-XFEL on 12 April 2016, two out of three fabricated structures are currently being operated; one each in the hard X-ray and the soft X-ray branches. These deflecting structures were carefully tuned by using a 4-m-long nodal phase scanner in a precisely temperature and humidity controlled cleanroom considering the phase predictions calculated using RF field solvers. We carried out RF conditioning and beam commissioning with highly-stable high-power S-band RF systems and an EPICS-based control system. We briefly present our design of S-band deflecting structure and discuss the test results, including the results of the RF and the beam measurements.
Tài liệu tham khảo
I. S. Ko et al., Appl. Sci. 7, 479 (2017).
H-S. Kang et al., Nature Photonis 11, 708 (2017).
C. Kim et al., in Proceedings of IBIC2016 (Barcelona, Spain, 2016), p. 11.
L. Faillace et al., in Proceedings of PAC2013 (Pasadena, CA USA, 2013), p. 1202.
H. Heo et al., J. Korean Phys. Soc. 66, 905 (2015).
http://epics.anl.gov.
O. H. Altenmueller, R. R. Larsen and G. A. Loew, Rev. Sci. Inst. 35, 438 (1964).
J. W. Wang and G. A. Loew, SLAC-PUB-5321, 1990.
N. M. Kroll, C-K. Ng and D. C. Vier, SLAC-PUB-8614, 2000.
S. H. Kim et al., in Proceedings of FEL2015 (Daejeon, Korea, 2015), p. 89.
J. Hu et al., in Proceedings of IPAC2016 (Busan, Korea, 2016), p. 2761.
C. Kim et al., in Proceedings of ICALEPCS2015 (Melbourne, Australia, 2015), p. 79.