TY - CONF AU - Jing, Y.C. AU - Litvinenko, V. AU - Petrushina, I. AU - Pinayev, I. AU - Shih, K. AU - Wu, Y.H. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Start to End Simulation on Beam Dynamics in Coherent Electron Cooling Accelerator J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A Coherent electron Cooling (CeC) has a potential of substantial reducing cooling time of the high-energy hadrons and hence to boost luminosity in high-intensity hadron-hadron and electron-hadron colliders. In a CeC system, a high quality electron beam is generated, propagated and optimized through a beam line which was carefully designed with consideration of space charge effect, wakefields and nonlinear dynamics such as coherent synchrotron radiation and chromatic aberration. In this paper, we present our study on the beam dynamics of such a beam line and compare the simulation result with what was measured in experiment. PB - JACoW Publishing CP - Geneva, Switzerland SP - 379 EP - 381 KW - electron KW - FEL KW - bunching KW - emittance KW - cavity DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPGW111 UR - http://jacow.org/ipac2019/papers/mopgw111.pdf ER - TY - CONF AU - Pinayev, I. AU - Altinbas, Z. AU - Brutus, J.C. AU - Curcio, A.J. AU - Di Lieto, A. AU - Hayes, T. AU - Hulsart, R.L. AU - Inacker, P. AU - Jing, Y.C. AU - Litvinenko, V. AU - Ma, J. AU - Mahler, G.J. AU - Mapes, M. AU - Mernick, K. AU - Mihara, K. AU - Miller, T.A. AU - Minty, M.G. AU - Narayan, G. AU - Petrushina, I. AU - Severino, F. AU - Shih, K. AU - Sorrell, Z. AU - Tuozzolo, J.E. AU - Wang, E. AU - Wang, G. AU - Zaltsman, A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Performance of CeC PoP Accelerator J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Coherent electron cooling experiment is aimed for demonstration of the proof-of-principle demonstration of reduction energy spread of a single hadron bunch circulating in RHIC. The electron beam should have the required parameters and its orbit and energy should be matched to the hadron beam. In this paper we present the achieved electron beam parameters including emittance, energy spread, and other critical indicators. The operational issues as well as future plans are also discussed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 559 EP - 561 KW - electron KW - FEL KW - gun KW - SRF KW - hadron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPMP050 UR - http://jacow.org/ipac2019/papers/mopmp050.pdf ER - TY - CONF AU - Litvinenko, V. AU - Altinbas, Z. AU - Brutus, J.C. AU - Di Lieto, A. AU - Gassner, D.M. AU - Hayes, T. AU - Inacker, P. AU - Jamilkowski, J.P. AU - Jing, Y.C. AU - Kellermann, R. AU - Ma, J. AU - Mahler, G.J. AU - Mapes, M. AU - Michnoff, R.J. AU - Mihara, K. AU - Miller, T.A. AU - Minty, M.G. AU - Narayan, G. AU - Paniccia, M.C. AU - Petrushina, I. AU - Phillips, D. AU - Pinayev, I. AU - Seberg, S.K. AU - Severino, F. AU - Shih, K. AU - Skaritka, J. AU - Smart, L. AU - Smith, K.S. AU - Sorrell, Z. AU - Than, R. AU - Tuozzolo, J.E. AU - Wang, E. AU - Wang, G. AU - Wu, Y.H. AU - Xiao, B.P. AU - Xin, T. AU - Zaltsman, A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Coherent Electron Cooling (CeC) Experiment at RHIC: Status and Plans J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We will present currents status of the CeC experiment at RHIC and discuss plans for future. Special focus will be given to unexpected experimental results obtained during RHIC Run 18 and discovery of a previously unknown type of microwave instability. We called this new phenomenon micro-bunching Plasma Cascade Instability (PCI). Our plan for future experiments includes suppressing this instability in the CeC accelerator and using it as a broad-band amplifier in the CeC system. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2101 EP - 2104 KW - electron KW - FEL KW - experiment KW - SRF KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS078 UR - http://jacow.org/ipac2019/papers/tupts078.pdf ER - TY - CONF AU - Petrushina, I. AU - Litvinenko, V. AU - Narayan, G. AU - Pinayev, I. AU - Severino, F. AU - Smith, K.S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Overcoming Multipacting Barriers in SRF Photoinjectors J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Superconducting RF (SRF) photoinjectors are considered to be a potential breakthrough in the area of high brightness electron sources. However, there is always the very important question of the compatibility of SRF cavities and high quantum efficiency (QE) photocathodes. A deposition of active elements from high QE photocathodes on the surface of a cavity makes it more vulnerable to multipacting (MP) and could affect the operation of an SRF gun. On the other side, MP can significantly reduce the lifetime of a photocathode. It is well known in the SRF community that a strong coupling, high forward power and sufficient cleanliness of cavity walls are the key components to overcome a low-level MP zone. In this paper we present a theoretical model of passing a MP barrier which could help estimate the desirable conditions for successful operation of an SRF gun. We demonstrate our results for the 113 MHz SRF photo-injector for Coherent electron Cooling (CeC) alongside with the experimental observations and 3D simulations of the MP discharge in the cavity. The results of the theoretical model and simulations show good agreement with the experimental results, and demonstrate that, if approached carefully, MP zones can be easily passed without any harm to the photocathode. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2105 EP - 2108 KW - cavity KW - gun KW - electron KW - cathode KW - SRF DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS079 UR - http://jacow.org/ipac2019/papers/tupts079.pdf ER - TY - CONF AU - Pinayev, I. AU - Jing, Y.C. AU - Kayran, D. AU - Litvinenko, V. AU - Petrushina, I. AU - Shih, K. AU - Wang, G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Measuring Beam Parameters with Solenoid J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We have developed methods of measuring electron beam energy and trajectory including angle and position based on the analysis of beam steering by a solenoid. Beam energy measurement is performed in the straight beamline and is suitable for the beams with substantial energy spread. In this paper, we describe the experimental set-up and the obtained results. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2739 EP - 2741 KW - solenoid KW - focusing KW - cathode KW - experiment KW - emittance DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW105 UR - http://jacow.org/ipac2019/papers/wepgw105.pdf ER - TY - CONF AU - Petrushina, I. AU - Jing, Y.C. AU - Litvinenko, V. AU - Ma, J. AU - Pinayev, I. AU - Shih, K. AU - Wang, G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Measurements of the Electrical Axes of the CeC PoP RF Cavities J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - It is common knowledge that every mode in an SRF cavity has a so-called electrical axis, and only in an ideal cavity would this axis align exactly with the geometrical axis of the device. The misalignment of the electrical axis creates an additional undesirable transverse kick to the beam, which has to be corrected to achieve the designed beam parameters. In this paper we present the two methods which have been used in order to determine the electrical axes in the RF cavities of the Coherent electron Cooling (CeC) Proof of Principle (PoP) accelerator. The electron accelerator for the CeC PoP consists of the three main RF components: the 113 MHz SRF gun, the two normal-conducting 500 MHz bunching cavities, and the 704 MHz SRF 5-cell elliptical cavity. We discuss, in detail, the specifics of the measurement for each cavity and provide the corresponding results. In addition, we describe the influence of the field asymmetry in the 500 MHz bunchers on the beam dynamics, which was observed experimentally and confirmed by simulations. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3031 EP - 3034 KW - cavity KW - cathode KW - gun KW - SRF KW - electron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB094 UR - http://jacow.org/ipac2019/papers/weprb094.pdf ER - TY - CONF AU - Litvinenko, V. AU - Hayes, T. AU - Jing, Y.C. AU - Kayran, D. AU - Ma, J. AU - Miller, T.A. AU - Narayan, G. AU - Petrushina, I. AU - Pinayev, I. AU - Severino, F. AU - Shih, K. AU - Wang, G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Microbunching Plasma-Cascade Instability J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We present a new type of longitudinal microbunching instability entitled ’Plasma-Cascade Instability’. This instability could occur in beams propagating along a straight section with external focusing elements. We present a theoretical description of this instability as well as self-consistent 3D simulations. Finally, we present results of experimental observation of Plasma-Cascade Instability at frequencies up to 10 THz using SRF linear accelerator built for Coherent electron Cooling experiment *. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3035 EP - 3038 KW - plasma KW - simulation KW - electron KW - bunching KW - focusing DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB095 UR - http://jacow.org/ipac2019/papers/weprb095.pdf ER -