TY - CONF AU - Lobach, I. AU - Halavanau, A. AU - Huang, Z. AU - Kim, K. AU - Lebedev, V.A. AU - Murokh, A.Y. AU - Nagaitsev, S. AU - Romanov, A.L. AU - Shaftan, T.V. AU - Stancari, G. AU - Valishev, A. AU - Yakimenko, V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Study of Fluctuations in Undulator Radiation in the IOTA Ring at Fermilab J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We study turn-by-turn fluctuations in the number of emitted photons in an undulator, installed in the IOTA electron storage ring at Fermilab with an InGaAs PIN photodiode and an integrating circuit. Our study was motivated by the previous experiment *. We propose a theoretical model for the experimental data from * and in our own experiment we attempted to verify the model in an independent and more systematic way. Moreover, these fluctuations are an interesting subject for a study by itself, since they act as a seed for SASE in FELs. We improve the precision of the measurements from * by subtracting the average signal amplitude using a comb filter with a one-turn IOTA delay, and by using a special algorithm for noise subtraction. We obtain a reasonable agreement between our theoretical model and experiment. Along with repeating the experiment from *, which was performed at a constant beam current, we also collect data for fluctuations in undulator light at different beam current values. Lastly, in our experiment we were able to see the transition from Poisson statistics to Super-Poisson statistics for undulator light, whereas in * only the latter statistics was observed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 777 EP - 780 KW - experiment KW - undulator KW - electron KW - radiation KW - photon DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB088 UR - http://jacow.org/ipac2019/papers/moprb088.pdf ER - TY - CONF AU - Nagaitsev, S. AU - Arodzero, A. AU - Lobach, I. AU - Murokh, A.Y. AU - Romanov, A.L. AU - Ruelas, M. AU - Shaftan, T.V. AU - Stancari, G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Experimental Study of a Single Electron in a Storage Ring via Undulator Radiation J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A single electron orbiting around a ring and emitting single quanta at the rate of about one event per hundred turns could produce a wealth of information about physical processes in large traps (i.e. storage rings) for charged particles. It should be noted that Paul and Penning traps in the 1980s led to the Nobel prize for studying state and motion of single quantum particles, and just recently the Penning trap technique has enabled the measurement of a single proton magnetic moment with an unprecedented precision of 10 decimal places. The information from the storage ring traps could also be used for characterization of a quantum system as well as the "trap" itself, i.e. measuring properties of the storage ring lattice and electron interaction with the laser fields. Although, the interest in single electron quantum processes today is mostly academic in nature, the diagnostics and methodology developed for single electron radiation studies could find subsequent applications in a variety of applied disciplines in quantum technology, including quantum communications and quantum computing. PB - JACoW Publishing CP - Geneva, Switzerland SP - 781 EP - 784 KW - photon KW - electron KW - undulator KW - experiment KW - radiation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB089 UR - http://jacow.org/ipac2019/papers/moprb089.pdf ER - TY - CONF AU - Hannon, F.E. AU - Andonian, G. AU - Harris, L.H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - A Plasmonic Niobium Photocathode for SRF Gun Applications J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The typical quantum efficiency of niobium is of the order 10⁻⁴, whilst also requiring UV lasers for emission. This paper presents the results of a plasmonic niobium surface that operates with IR laser via multiphoton emission. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2079 EP - 2082 KW - cathode KW - gun KW - laser KW - cavity KW - photon DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS069 UR - http://jacow.org/ipac2019/papers/tupts069.pdf ER - TY - CONF AU - Kutsaev, S.V. AU - Agustsson, R.B. AU - Berry, R.D. AU - Chao, D. AU - Conway, Z.A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Stand-alone Accelerator System Based on SRF Quarter-wave Resonators J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Superconducting accelerators are large and complex systems requiring a central refrigerator and distributed transfer systems to supply 2-4 K liquid helium. Stand-alone, cryocooler-based systems are of interest both to scientific facilities and industrial applications, as they do not require large cryogenic infrastructure and trained specialists for operation. Here we present our approach to the challenge of using low-power commercially available cryocoolers to operate niobium superconducting resonators at 4.4 K with high accelerating voltages and several watts of heating. Engineering and design results from RadiaBeam Systems, collaborating with Argonne National Laboratory, for a stand-alone liquid-cooled cryomodule with 10 Watts of 4.4 K cooling capacity housing a 72.75 MHz quarter-wave resonator operating at 2 MV for synchronous ions travelling at 7.7% of speed of light will be discussed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2185 EP - 2188 KW - cryomodule KW - SRF KW - operation KW - cavity KW - vacuum DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS112 UR - http://jacow.org/ipac2019/papers/tupts112.pdf ER - TY - CONF AU - Kutsaev, S.V. AU - Agustsson, R.B. AU - Berry, R.D. AU - Borland, M. AU - Chao, D. AU - Chimalpopoca, O. AU - Nassiri, A. AU - Smirnov, A.Yu. AU - Sun, Y. AU - Taletski, K.V. AU - Verma, A. AU - Waldschmidt, G.J. AU - Zholents, A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Microwave Thermionic Electron Gun for Synchrotron Light Sources J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Thermionic RF guns are the source of electrons used in many practical applications, such as drivers for synchrotron light sources, preferred for their compactness and efficiency. RadiaBeam Technologies has developed a new thermionic RF gun for the Advanced Photon Source at Argonne National Laboratory, which would offer substantial improvements in reliable operations with a robust interface between the thermionic cathode and the cavity, as well as better RF performance, compared to existing models. This improvement became possible by incorporating new pi-mode electromagnetic design, robust cavity back plate design, and a cooling system that will allow stable operation for up to 1 A of beam current and 100 Hz rep rate at 1.5 μs RF pulse length, and 70 MV/m peak on-axis field in the cavity. In this paper, we discuss the electromagnetic and engineering design of the cavity and provide the test results of the new gun. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2189 EP - 2192 KW - gun KW - cathode KW - electron KW - cavity KW - coupling DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS113 UR - http://jacow.org/ipac2019/papers/tupts113.pdf ER - TY - CONF AU - Andonian, G. AU - Bruhwiler, D.L. AU - Campese, T.J. AU - Conde, M.E. AU - Cook, N.M. AU - Doran, D.S. AU - Ha, G. AU - O'Shea, F.H. AU - Power, J.G. AU - Rosenzweig, J.B. AU - Shao, J.H. AU - Wisniewski, E.E. AU - Xu, T. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Status on a Laser Injection in Beam Driven Dielectric Wakefield Accelerator Experiment J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The generation of high-brightness beams with ultra-low emittance using the plasma photocathode technique has gained significant traction in recent years. The practical execution of a combined plasma wakefield acceleration section and a laser injected typically requires a dual gas medium for precision ionization of low and high ionization thresholds. The concept can be partially simplified in experiment by replacing the plasma wakefield acceleration component with a dielectric wakefield acceleration scheme, sacrificing field gradient but maintaining low emittance beam generation. In this paper, we describe the progress on the design of a hybrid scheme, using laser injection in a gas medium within a dielectric wakefield accelerator structure. The proof-of-concept experiment is planned to take place at the Argonne Wakefield Accelerator. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3761 EP - 3763 KW - wakefield KW - experiment KW - plasma KW - laser KW - electron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPGW073 UR - http://jacow.org/ipac2019/papers/thpgw073.pdf ER -