TY - CONF AU - Guo, J. AU - Daly, E.F. AU - Drachuk, E. AU - Fernandes, R.R. AU - Henry, J. AU - Holmes, D. AU - Matalevich, J. AU - Park, G.-T. AU - Rimmer, R.A. AU - Savransky, D. AU - Smith, K.S. AU - Xu, W. AU - Zaltsman, A. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Design and Prototyping of the Electron Ion Collider Electron Storage Ring SRF Cavity J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - Among the EIC¿s numerous RF subsystems, the electron storage ring¿s (ESR) 591 MHz fundamental RF system is one of the most challenging. Each cavity in the system will handle up to 2.5 A of beam current and supply up to 600 kW beam power under a wide range of voltage. The EIC R&D plan includes the design, fabrication and testing of such a cavity. In this paper, we will report the latest status and findings of the ongoing design and prototyping of this cavity, including the RF and mechanical/thermal design, fabrication design, and the progress of fabrication. PB - JACoW Publishing CP - Geneva, Switzerland SP - 293 EP - 297 KW - cavity KW - simulation KW - HOM KW - operation KW - electron DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-MOPMB078 UR - https://jacow.org/srf2023/papers/mopmb078.pdf ER - TY - CONF AU - Li, Z. AU - De Silva, S.U. AU - Delayen, J.R. AU - Rimmer, R.A. AU - Wu, Q. AU - Xiao, B.P. AU - Xu, W. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - EIC 197 MHz Crab Cavity RF Optimization J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - Crab cavities, operating at 197 MHz and 394 MHz respectively, will be used to compensate the loss of luminosity due to a 25 mrad crossing angle at the interaction point in the Electron Ion Collider (EIC). Both crab cavities are of the RF Dipole (RFD) shape. To meet the machine design requirements, there are a few important cavity design considerations that need to be addressed. First, to achieve stable cavity operation at the design voltages, cavity geometry details must be optimized to suppress potential multipacting. Incorporating strong HOM damping in the cavity design is required for the beam stability and quality. Furthermore, due to the finite pole width, the multipole fields, especially the sextupole and the decapole terms, need to be minimized to maintain an acceptable beam dynamic aperture. This paper will present the RF optimization details of the 197 MHz cavity. PB - JACoW Publishing CP - Geneva, Switzerland SP - 584 EP - 588 KW - cavity KW - HOM KW - multipactoring KW - GUI KW - impedance DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-TUPTB068 UR - https://jacow.org/srf2023/papers/tuptb068.pdf ER - TY - CONF AU - Huque, N.A. AU - Castilla, A. AU - Daly, E.F. AU - De Silva, S.U. AU - Drachuk, E. AU - Henry, J. AU - Marchlik, M. AU - Xiao, B.P. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Development of a Prototype 197 MHz Crab Cavity for the Electron-Ion Collider at JLab J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - Thomas Jefferson National Accelerator Facility (JLab) is currently developing a prototype 197 MHz Radio-Frequency Dipole (RFD) crab cavity as part of the Electron-Ion Collider (EIC) to be built at Brookhaven National Laboratory (BNL). Cryomodules containing these cavities will be part of Hadron Storage Ring (HSR) of the EIC. The prototype cavity is constructed primarily of formed niobium sheets of thickness 4.17 mm, with machined niobium parts used as interfaces where tight tolerancing is required. The cavity¿s large size and complex features present a number of challenges in fabrication, tuning, and RF testing. Structural and forming analyses have been carried out to optimize the design and fabricated processes. An overview of the design phase and the current state of fabrication are presented in this paper. PB - JACoW Publishing CP - Geneva, Switzerland SP - 685 EP - 690 KW - cavity KW - GUI KW - niobium KW - HOM KW - electron DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-WEPWB051 UR - https://jacow.org/srf2023/papers/wepwb051.pdf ER - TY - CONF AU - Conway, Z.A. AU - Anderson, R. AU - Brutus, J.C. AU - Hernandez, K. AU - Holmes, D. AU - Mernick, K. AU - Narayan, G. AU - Polizzo, S. AU - Seberg, S.K. AU - Severino, F. AU - Sowinski, M. AU - Than, R. AU - Wu, Q. AU - Xiao, B.P. AU - Xu, W. AU - Zaltsman, A. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Pre-Installation Performance of the RHIC 56 MHz Superconducting System J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - Pre-installation test results for the RHIC 56 MHz superconducting RF system are presented here. The 56 MHz quarter-wave resonator achieved a stable accelerating potential of 1.1 MV with 13 W of RF loss at 4.5 K demonstrating its viability for increasing the luminosity of sPHENIX collisions. The new 120 kW travelling wave fundamental mode damper and dual 6 kW combined-function fundamental power couplers perform as expected at 3 kW but remain to be operated with the expected ~40 times greater power achievable with the RHIC sPHENIX beams. PB - JACoW Publishing CP - Geneva, Switzerland SP - 718 EP - 720 KW - cryomodule KW - operation KW - coupling KW - cavity KW - HOM DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-WEPWB061 UR - https://jacow.org/srf2023/papers/wepwb061.pdf ER - TY - CONF AU - Xu, W. AU - Conway, Z.A. AU - Daly, E.F. AU - Guo, J. AU - Rimmer, R.A. AU - Smith, K.S. AU - Zaltsman, A. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Theoretical Model of External Q Tuning for an SRF Cavity with Waveguide Tuner J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - A wide range of electron beam energies (5 ¿ 18 GeV) and beam currents (0.2 ¿ 2.5 A) in EIC Electron Storage Ring (ESR) operating scenarios requires a capability of adjusting coupling factor up to a factor of 20 for the 591 MHz Superconducting Radio Frequency (SRF) cavities, which contains two fundamental power couplers (FPC) delivering continuous wave (CW) 800 kW RF power to the beam. Currently, adjusting external Q of a SRF cavity is done by varying protrusion of FPC¿s inner conductor in beam pipe or using three stub tuner to adjust external Q value, which either has limit on tuning range or limit on operating power. This paper presents a method of tuning the FPC external Q by a multiple-waveguide tuner, which allows for high power, wide tuning range operations. The theoretical model of matching beam impedance with waveguide tuner and detailed matching conditions and limits will be presented. Follow the theoretical model, a preliminary design of a 3D waveguide tuner will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 794 EP - 796 KW - cavity KW - GUI KW - SRF KW - operation KW - electron DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-WEPWB089 UR - https://jacow.org/srf2023/papers/wepwb089.pdf ER - TY - CONF AU - Xiao, B.P. AU - De Silva, S.U. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Heavily Damped Crab Cavities for High Luminosity Collisions J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - Next generation colliders require crab cavities to mitigate parasitic collisions caused by finite crossing angle for luminosity leveling and detector data pile up reduction. The Electron Ion Collider (EIC) crab cavity designs will be introduced as an example to fulfill the geometrical constraints, crabbing voltages, multipole components, Higher Order Mode (HOM) power and impedance budgets. Operational challenges such as tuning, high gain low delay control loop, amplitude and phase noises control will be discussed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 986 EP - 989 KW - cavity KW - GUI KW - HOM KW - impedance KW - collider DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-FRIBA03 UR - https://jacow.org/srf2023/papers/friba03.pdf ER - TY - CONF AU - McIntosh, P.A. AU - Belomestnykh, S.A. AU - Burt, G. AU - Calaga, R. AU - De Silva, S.U. AU - Delayen, J.R. AU - Gonin, I.V. AU - Khabiboulline, T.N. AU - Lunin, A. AU - Okugi, T. AU - Orlov, Y.M. AU - Verdú-Andrés, S. AU - Xiao, B.P. AU - Yakovlev, V.P. AU - Yamamoto, A. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Crab Cavities for ILC J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - For the 14 mrad crossing angle proposed, crab cavity systems are fundamentally anticipated for the viable operation of the International Linear Collider (ILC), in order to maximise its luminosity performance. Since 2021, a specialist development team have been defining optimum crab cavity technologies which can fulfil the operational requirements for ILC, both for its baseline centre-of-mass energy of 250 GeV, but also extending those requirements out to higher beam collision intensities. Five design teams have established crab cavity technology solutions, which have the capability to also operate up to 1 TeV centre-of-mass. This presentation showcases the key performance capabilities of these designs and their associated benefits for both manufacture and integration into the ILC Interaction Region. The recommended outcome of the recently conducted crab cavity technology down-selection, will also be highlighted. PB - JACoW Publishing CP - Geneva, Switzerland SP - 990 EP - 998 KW - cavity KW - HOM KW - SRF KW - operation KW - impedance DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-FRIBA04 UR - https://jacow.org/srf2023/papers/friba04.pdf ER -