TY - CONF AU - Li, C.L. AU - Chen, J.H. AU - Chen, Z.C. AU - Liu, B. AU - Liu, T. AU - Wang, X.T. AU - Wu, H.L. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Second Order Intensity Correlation and Statistical Properties of a Soft X-Ray Free Electron Laser J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - High degree of transverse field coherence is one of the unique properties of an FEL compared with a 3rd gen-eration storage ring light source. As a result, the FEL advances the development of innovative research and technology that was not previously feasible. A truly coherent source should be coherent in all orders de-scribed from the intensity correlation functions. In this paper, second order intensity correlation of FEL radia-tion is investigated based on the Hanbury Brown-Twiss intensity correlation method. The statistical properties of radiation produced from SASE was also investigated and compared with the statistical proper-ties of a phase-locked laser. The results show that the statistical properties of a SASE mode behave as a cha-otic source, which is significantly different from the properties of a phase-locked laser beam. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1788 EP - 1791 KW - laser KW - FEL KW - radiation KW - electron KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPRB046 UR - http://jacow.org/ipac2019/papers/tuprb046.pdf ER - TY - CONF AU - Liu, T. AU - Feng, C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Proposal of the Reflection Hard X-Ray Self-Seeding at the SHINE Project J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - FEL self-seeding has been demonstrated a great advantage for the generation of a fully coherent and high brightness X-ray pulse experimentally. Generally, transmission monochromators with single crystal are adopted worldwide, such as LCLS, PAL-XFEL and European-XFEL. Recently, the self-seeding scheme based on a reflection monochromator with a double-crystal is proposed and demonstrated at SACLA successfully. In view of several potential advantages of the reflection type, here we give the proposal of the reflection monochromator based self-seeding and enable the application on the SHINE project. This manuscript is mainly focus on monochromator schemes at SHINE, instead of FEL simulations. We will present considerable schemes based on the specific undulator line. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1792 EP - 1794 KW - FEL KW - undulator KW - photon KW - polarization KW - lattice DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPRB047 UR - http://jacow.org/ipac2019/papers/tuprb047.pdf ER - TY - CONF AU - Yu, C. AU - Deng, H.X. AU - He, Y.Z. AU - Hu, X. AU - Jiang, Z. AU - Liu, B. AU - Qian, M.F. AU - Wang, D. AU - Wang, H.F. AU - Wen, Y.M. AU - Xiang, S. AU - Yin, L. AU - Zhang, J.D. AU - Zhang, W. AU - Zhao, Z.T. AU - Zhou, Q.G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - First Results of the IVU16 Prototype Undulator Measurements J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Shanghai Synchrotron Radiation Facility (SSRF) has developed a 16 mm period length, 4 mm gap, in-vacuum undulator (IVU) that is planned to be installed and tested in the 1.5 GeV SXFEL-SBP beam line. This paper will describe the main parameters of the undulator and the key design choices that have been made. The first undulator prototype was assembled and magnetically tested. First measurements with vacuum chamber will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1808 EP - 1810 KW - FEL KW - vacuum KW - undulator KW - MMI KW - SRF DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPRB055 UR - http://jacow.org/ipac2019/papers/tuprb055.pdf ER - TY - CONF AU - Paparella, R. AU - Bertucci, M. AU - Bignami, A. AU - Bosotti, A. AU - Chen, J.F. AU - Chiodini, M. AU - D'Ambros, A. AU - Michelato, P. AU - Monaco, L. AU - Pagani, C. AU - Sagliano, L. AU - Sertore, D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Status of the PIP-II Activities at INFN-LASA J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - INFN-LASA joined the international effort for the PIP-II project in Fermilab and it is expected to build the 650 MHz superconducting cavities required by the low-beta section of the 800 MeV front-end proton linac, as recently signed by US DOE and Italian MIUR. After developing the electro-magnetic and mechanical design, INFN-Milano started the prototyping phase by producing five single-cells and two complete 5-cells cavities. In a joint effort with Fermilab the road for the optimal surface treatment for such low-beta resonators has started in order to approach the existing state-of-the-art performances of beta 1 cavities. This paper reports the status of PIP-II activities at INFN-LASA summarizing manufacturing experience and preliminary experimental results. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2215 EP - 2218 KW - cavity KW - niobium KW - linac KW - interface KW - SRF DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS120 UR - http://jacow.org/ipac2019/papers/tupts120.pdf ER - TY - CONF AU - Li, L. AU - Gu, Q. AU - Liu, Y.F. AU - Liu, Y.J. AU - Wang, Z. AU - Xiao, C.C. AU - Zhang, J.Q. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - LLRF Control System for RF GUN at SXFEL Test Facility J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A Soft X-ray Free Electron Laser Test Facility (SXFEL-TF) based on normal conducting linear accelerator was constructed at the Shanghai Synchrotron Radiation Facility (SSRF) campus by a joint team of Shanghai Institute of Applied Physics and Tsinghua University. It consists of multiple Radio Frequency (RF) stations with standing wave cavity (RF Gun) and traveling wave accelerating structures working at different frequencies. Low Level Radio Frequency (LLRF) system is used to measure the RF field in the cavities or structures and correct the fluctuation in RF fields with pulse-to-pulse feedback controllers. This paper describes the hardware and architecture of the LLRF system for electromagnetic filed stabilization inside the radio frequency electron gun, in the SXFEL-TF. A complete control path has be presented, including RF front-end board, I/Q detector and feedback controller. Algorithms used to stabilize the RF field have been presented as well as the software environment used to provide remote access to the control device. Finally, the performance of the LLRF system that was realized in the beam commissioning is presented and meets the high accuracy requirements. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3912 EP - 3914 KW - gun KW - controls KW - LLRF KW - FEL KW - FPGA DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB044 UR - http://jacow.org/ipac2019/papers/thprb044.pdf ER -