TY - CONF AU - Tang, J.Z. ED - Schaa, Volker RW ED - Huang, Wenhui ED - Yan, Xueqing ED - Tang, Chuanxiang ED - Li, Lu TI - Lowest Longitudinal and Transverse Resistive-wall Wake and Impedance for Nonultra-relativistic Beams J2 - Proc. of SAP2023, Xichang, China, 10-12 July 2023 CY - Xichang, China T2 - Symposium on Accelerator Physics T3 - 14 LA - english AB - With the development of the steady-state microbunch(SSMB) storage ring, its parameters reveal that the ultra-relativistic assumption which is wildly used is not valid for the electron beam bunch train. For a bunch train with a length in the 100nm range, spacing of 1um, and energy in the hundred MeV range, the action angle of the space charge force is estimated by r/γ. The space charge effect of the mirror current loop formed in the wall with a scale of 1cm will have a sustained effect on approximately dozens of microbunches behind the source particle. The strength of the interaction between such bunches and the potential instability it may cause needs careful evaluation. At the same time, the effect of the space charge inside a single bunch due to space charge effect also needs to be considered. We reorganized the lowest-order longitudinal wakefield under non-extreme relativistic conditions, and modified the inconsistent part in the theoretical derivation in some essays of the lowest-order transverse wakefield. We present the modified theoretical results and analysis. The action area are then divided into three parts. It lays foundation in future research. PB - JACoW Publishing CP - Geneva, Switzerland SP - 21 EP - 23 KW - wakefield KW - dipole KW - impedance KW - electron KW - space-charge DA - 2024/11 PY - 2024 SN - 978-3-95450-265-3 DO - doi:10.18429/JACoW-SAP2023-MOPB004 UR - https://jacow.org/sap2023/papers/mopb004.pdf ER - TY - CONF AU - Li, H.Y. AU - Chen, H.B. AU - Gao, Q. AU - Gu, W.H. AU - Shi, J.R. AU - Zha, H. ED - Schaa, Volker RW ED - Huang, Wenhui ED - Yan, Xueqing ED - Tang, Chuanxiang ED - Li, Lu TI - Approximation of Space Charge Effect in the Presence of Longitudinal Magnetic Fields J2 - Proc. of SAP2023, Xichang, China, 10-12 July 2023 CY - Xichang, China T2 - Symposium on Accelerator Physics T3 - 14 LA - english AB - The space charge effect plays a significant role in the evolution of phase space during beam transport. Applying an external longitudinal magnetic field has been shown to effectively reduce beam expansion through the mechanism of beam rotation. In this article, we present a fast approximation algorithm for estimating the impact of an external magnetic field on beam expansion. The algorithm enables efficient computations and provides insights into controlling the phase space dynamics of the beam in the presence of longitudinal magnetic fields. PB - JACoW Publishing CP - Geneva, Switzerland SP - 27 EP - 29 KW - space-charge KW - simulation KW - controls KW - electron KW - emittance DA - 2024/11 PY - 2024 SN - 978-3-95450-265-3 DO - doi:10.18429/JACoW-SAP2023-MOPB008 UR - https://jacow.org/sap2023/papers/mopb008.pdf ER - TY - CONF AU - Li, Z.Z. AU - Chao, A. AU - Deng, X.J. AU - Pan, Z. AU - Tang, C.-X. ED - Schaa, Volker RW ED - Huang, Wenhui ED - Yan, Xueqing ED - Tang, Chuanxiang ED - Li, Lu TI - Generalized Longitudinal Strong Focusing: A Ring-Based Beam Manipulation Technique J2 - Proc. of SAP2023, Xichang, China, 10-12 July 2023 CY - Xichang, China T2 - Symposium on Accelerator Physics T3 - 14 LA - english AB - Generalized longitudinal strong focusing (GLSF), a ring-based beam manipulation technique, has been proposed to generate steady-state, nanometer-long electron bunches in laser-driven storage rings. Coherent EUV radiation can thus be produced with greatly enhanced power and photon flux, benefiting a wide range of scientific and industrial communities. The GLSF mechanism invokes precise transverse-longitudinal coupling dynamics and exploits the ultralow vertical beam emittance. In a GLSF ring, kW-level coherent EUV radiation is attainable. PB - JACoW Publishing CP - Geneva, Switzerland SP - 85 EP - 87 KW - radiation KW - storage-ring KW - laser KW - bunching KW - emittance DA - 2024/11 PY - 2024 SN - 978-3-95450-265-3 DO - doi:10.18429/JACoW-SAP2023-MOPB037 UR - https://jacow.org/sap2023/papers/mopb037.pdf ER - TY - CONF AU - Pan, Z. AU - Chao, A. AU - Deng, X.J. AU - Huang, W.-H. AU - Li, Z.Z. AU - Tang, C.-X. ED - Schaa, Volker RW ED - Huang, Wenhui ED - Yan, Xueqing ED - Tang, Chuanxiang ED - Li, Lu TI - Low-Alpha Storage Ring Design for Steady-State Microbunching to Generate EUV Radiation J2 - Proc. of SAP2023, Xichang, China, 10-12 July 2023 CY - Xichang, China T2 - Symposium on Accelerator Physics T3 - 14 LA - english AB - A new concept is proposed for minimizing the longitudinal emittance of a low momentum compaction factor (low-alpha) storage ring which has the capability to stably store sub-femtosecond electron bunches for the first time. This storage ring is designed for Steady-State microbunching (SSMB) to generate kW level average power EUV radiation. The proposed design approach can be applied to any quasi-isochronous storage rings to yield very high radiation power due to longitudinal coherence of the radiation. We obtain an optimal lattice design by minimizing global and local momentum compaction factors simultaneously and the result of single-particle tracking shows that the electron beam with equilibrium rms bunch length of about 40 nm can be stored in this ring. Nonlinear dynamics is studied for this lattice. PB - JACoW Publishing CP - Geneva, Switzerland SP - 88 EP - 91 KW - storage-ring KW - radiation KW - lattice KW - electron KW - coupling DA - 2024/11 PY - 2024 SN - 978-3-95450-265-3 DO - doi:10.18429/JACoW-SAP2023-MOPB039 UR - https://jacow.org/sap2023/papers/mopb039.pdf ER - TY - CONF AU - Liu, X.Y. AU - Fang, P.Z. AU - Li, Y. AU - Wang, X.W. AU - Wang, Z.J. AU - Wang, Z.M. AU - Xiong, Y. AU - Yao, H.J. AU - Zheng, S.X. ED - Schaa, Volker RW ED - Huang, Wenhui ED - Yan, Xueqing ED - Tang, Chuanxiang ED - Li, Lu TI - Study on XiPAF Synchrotron Nonlinear Dynamics J2 - Proc. of SAP2023, Xichang, China, 10-12 July 2023 CY - Xichang, China T2 - Symposium on Accelerator Physics T3 - 14 LA - english AB - Xi’an Proton Application Facility (XiPAF) has been operational since 2020, which can accumulate 2e11 protons after injection and 1e11 protons after acceleration. In this paper, we have investigated the XiPAF synchrotron nonlinearity by simulation and experiments, the beam loss occurs with resonance vx+2vy=5 in the absence of space charge, and resonance 2vx-2vy=0 in the presence of space charge. The stripping foil also plays an important role due to its multiple scattering effect and ionization energy loss effect. PB - JACoW Publishing CP - Geneva, Switzerland SP - 92 EP - 95 KW - resonance KW - synchrotron KW - space-charge KW - injection KW - simulation DA - 2024/11 PY - 2024 SN - 978-3-95450-265-3 DO - doi:10.18429/JACoW-SAP2023-TUPB006 UR - https://jacow.org/sap2023/papers/tupb006.pdf ER - TY - CONF AU - Feng, B.Y. AU - Chen, H.B. AU - Gao, Q. AU - Lin, X. AU - Shi, J.R. AU - Zha, H. ED - Schaa, Volker RW ED - Huang, Wenhui ED - Yan, Xueqing ED - Tang, Chuanxiang ED - Li, Lu TI - Multipole Field Optimization of X-Band High Gradient Structure J2 - Proc. of SAP2023, Xichang, China, 10-12 July 2023 CY - Xichang, China T2 - Symposium on Accelerator Physics T3 - 14 LA - english AB - The X-band constant gradient acceleration structure plays a crucial role in the VIGAS project. However, the presence of a multipole field component in the struc-ture’s coupler leads to an increase in ray bandwidth and a decrease in yield, ultimately affecting the quality of the generated rays. Through calculations, it has been determined that the quadrupole field component is particularly prominent in the original structure, ac-counting for 29.5\% of the fundamental mode strength. Therefore, it is necessary to modify the cavity struc-ture of the coupler. By altering the shape of the cavity to two staggered circles, the objective of reducing the quadrupole field is achieved. The optimized quadru-pole field component now accounts for approximately 0.3\% of the fundamental mode strength. Subsequently, the non-resonant perturbation method was employed to simulate and experimentally measure the magnitude of the multipole field component in the actual acceler-ation cavity. PB - JACoW Publishing CP - Geneva, Switzerland SP - 108 EP - 110 KW - multipole KW - quadrupole KW - cavity KW - simulation KW - acceleration DA - 2024/11 PY - 2024 SN - 978-3-95450-265-3 DO - doi:10.18429/JACoW-SAP2023-TUPB013 UR - https://jacow.org/sap2023/papers/tupb013.pdf ER - TY - CONF AU - Yao, H.J. AU - Li, Y. AU - Liu, X.Y. AU - Wang, X.W. AU - Wang, Z.J. AU - Wang, Z.M. AU - Zheng, S.X. ED - Schaa, Volker RW ED - Huang, Wenhui ED - Yan, Xueqing ED - Tang, Chuanxiang ED - Li, Lu TI - The Design of a Proton-Heavy Ion Hybrid Synchrotron Upgraded from XiPAF Proton Ring J2 - Proc. of SAP2023, Xichang, China, 10-12 July 2023 CY - Xichang, China T2 - Symposium on Accelerator Physics T3 - 14 LA - english AB - Xi’an 200MeV Proton Application Facility (XiPAF) has been basically completed at the end of 2020, providing proton beams of 10 to 200 MeV for space radiation effect studies on electronics. To expand its capabilities, XiPAF is undergoing an upgrade to deliver multiple ion species, from proton to Bismuth ion. The upgrade focuses on three aspects. First, the original negative hydrogen linear injector will be remodeled to a proton linear injector. Second, a heavy ion linear injector will be added. Third, the existing proton ring will be retrofitted into a hybrid proton-heavy ion synchrotron. Correspondingly, the beam transport lines will also be modified. This paper details the considerations and physical designs for upgrading the synchrotron. Within the scope, we discuss the challenges and solutions in transforming a specialized proton synchrotron into a multi-ion accelerator under the constraints of existing plant layout and reuse of existing equipment. PB - JACoW Publishing CP - Geneva, Switzerland SP - 129 EP - 132 KW - injection KW - proton KW - synchrotron KW - heavy-ion KW - extraction DA - 2024/11 PY - 2024 SN - 978-3-95450-265-3 DO - doi:10.18429/JACoW-SAP2023-TUPB021 UR - https://jacow.org/sap2023/papers/tupb021.pdf ER - TY - CONF AU - Li, Y. AU - Wang, X.W. AU - Xing, Q.Z. AU - Yao, H.J. AU - Zheng, S.X. ED - Schaa, Volker RW ED - Huang, Wenhui ED - Yan, Xueqing ED - Tang, Chuanxiang ED - Li, Lu TI - Design of a Synchrotron for Proton FLASH Radiotherapy Based on Fast Variable-Energy Bunch Splitting J2 - Proc. of SAP2023, Xichang, China, 10-12 July 2023 CY - Xichang, China T2 - Symposium on Accelerator Physics T3 - 14 LA - english AB - Ultra-high dose rate (FLASH) radiotherapy not only guarantees effective tumor treatment but also greatly enhances the protection of normal tissue. Moreover, it is a convenient procedure for tumor patients that has enhanced the benefits provided by medical institutions. Proton FLASH radiotherapy, which combines the Bragg peak effect of proton spatial dose distribution with the unique temporal effect advantage of FLASH, is an attractive tumor treatment approach. To achieve proton FLASH discrete pencil beam scanning in a 1-L volume, taking into account the 5-mm point interval, 9261 points would need to be irradiated within 500 ms, which is beyond the capability of existing medical devices. To meet these requirements, based on a fast cycle synchrotron with a period of 25 Hz, we simultaneously combined variable-energy, fast splitting, and extraction beam bunches, and proposed a scanning method suitable for continuous variable-energy extraction bunches. The proposed technique meet the requirements of proton FLASH discrete pencil beam scanning within a volume of 1 L. PB - JACoW Publishing CP - Geneva, Switzerland SP - 141 EP - 143 KW - proton KW - synchrotron KW - extraction KW - kicker KW - radiation DA - 2024/11 PY - 2024 SN - 978-3-95450-265-3 DO - doi:10.18429/JACoW-SAP2023-TUPB026 UR - https://jacow.org/sap2023/papers/tupb026.pdf ER -