Keyword: radiation
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MOPB003 Study on a Polarization Controllable Undulator for High-Gain Free Electron Lasers polarization, undulator, controls, HOM 18
 
  • R. Huang, Q.K. Jia
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  • L.J. Chen
    CAEP/IAE, Mianyang, Sichuan, People’s Republic of China
 
  Funding: Work is supported by National Natural Science Foundation of China (12175224, 11805200)
SASE FEL can generate intense and coherent linearly-polarized X-ray when high energy electron beams travelling through a long planar undulator. It is also of great importance and interest to control the polarization of FEL. One possible solution is utilizing a customized undulator to adjust the magnetic field direction. By tuning the displacement of the magnetic block arrangement, variation of polarization could be achieved. In this paper we study on a polarization controllable undulator to realize the variable polarized magnetic field. Different shapes and design considerations of the magnetic block configuration will be introduced. The value of peak field and the region of good field will be analysed and discussed.
 
DOI • reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB003  
About • Received ※ 01 July 2023 — Revised ※ 08 July 2023 — Accepted ※ 09 July 2023 — Issued ※ 20 July 2024
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MOPB026 Physical Design for EEHG Beamlines at S3FEL FEL, electron, undulator, simulation 55
 
  • X.F. Wang
    Institute of Advanced Science Facilities, Shenzhen, People’s Republic of China
  • C. Feng, Z. Wang
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • X.M. Li, J.T. Sun, Y. Yu
    DICP, Dalian, Liaoning, People’s Republic of China
  • Y.F. Liang, X.M. Yang, H. Yi, L. Zeng, W.Q. Zhang
    IASF, Shenzhen, Guangdong, People’s Republic of China
 
  Funding: Work supported by the National Key R&D Program of China (Grant No.2018YFE0203000) and the National Natural Science Foundation of China (Grant No.22288201).
The proposed Shenzhen Superconducting Soft X-Ray Free-electron Laser (S3FEL) aims at generating FEL pulses from 1 nm to 30 nm. At phase-I, two undulator beamlines work at ehco-enable harmonic generation (EEHG) principle. The two undulators will cover the spectral ranges 2.3-15 nm (~83-539 eV) and 5-30 nm (~41-248 eV), respectively, when receiving electrons from 2.5 GeV superconducting linac. However, the generated FEL radiation is sensitive to various electron beam properties, e.g., its energy profile influenced by collective effects such as Coherent Synchroton Radiation (CSR), especially at high harmonics. To generate intense full coherent FEL radiation at ultra-short wavelength, a novel technique of EEHG cascaded harmonic lasing method is also considered. Physical design and FEL performance are described in this paper.
 
DOI • reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB026  
About • Received ※ 10 July 2023 — Revised ※ 11 July 2023 — Accepted ※ 18 July 2023 — Issued ※ 04 October 2024
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MOPB027 A Scheme of Fully Coherent X-Ray Free Electron Laser for the Shine Based on Fresh-Slices electron, FEL, undulator, simulation 59
 
  • YX. Liu
    SINAP, Shanghai, People’s Republic of China
  • T. Liu
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
 
  In this paper, the fresh-slice self-seeding free electron laser scheme is studied, and the feasibility of its application in the SHINE project is analyzed. The scheme used the fresh-slice method to generate the beam with adjustable spatial distribution, which can effectively improve the longitudinal coherence and stability of the self-seeding output radiation. Through the FEL simulation, we demonstrated that this scheme can produce a highly stable, narrow bandwidth pulse output under the SHINE’s parametric conditions, which will be beneficial to further improve the performance of this device in the future.  
poster icon Poster MOPB027 [1.524 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB027  
About • Received ※ 10 July 2023 — Revised ※ 11 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 02 November 2023
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MOPB034 Start to End Simulation for A Compact THz-FEL electron, undulator, cavity, FEL 76
 
  • R.Y. Luo, Q.S. Chen
    HUST, Wuhan, People’s Republic of China
 
  Funding: This work is supported by the National Natural Science Foundation of China(No.12175077)
An oscillator type terahertz free electron laser (THz-FEL) is under construction at Huazhong University of Science and Technology (HUST). The designed electron beam energy ranges from 8 MeV to 14 MeV, and the radiation frequency ranges from 3 THz to 10 THz. FEL requires high quality electron beams of emittance, energy spread, bunch charge etc. To know the overall facility performance, a start to end simulation (from electron gun to the end of the oscillator) of the THz-FEL is performed. The simulation of the electron gun to the exit of the linac is performed using PARMELA, where the effect of space charge effects is considered. In addition, the effect of beam loading effect is considered for the linac. The transport line is matched and simulated using ELEGANT. GENESIS 1.3 and OPC is used for the lasing process. Results of the simulation are presented and discussed in this paper.
 
DOI • reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB034  
About • Received ※ 30 June 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 18 October 2024
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MOPB036 Compact Accelerator Light Source for Industrial Applications synchrotron, storage-ring, synchrotron-radiation, injection 82
 
  • Q.L. Zhang, C.L. Li, K. Wang
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • Y. Lu
    Zhangjiang Lab, Shanghai, People’s Republic of China
  • K. Wang
    SINAP, Shanghai, People’s Republic of China
  • Y.X. Wang
    UCAS, Beijing, People’s Republic of China
 
  Synchrotron radiation has great application potential in industry. However, the large scale of modern light source has limited it from popular use. Compact accelerator light source has many virtues such as small scale, cost effectiveness, maintenance convenience, etc., which make it a main solution of light source application in industry. The idea has attracted great interests from many institutes, and much effort has been put into its research and development. In this paper we present a design of compact accelerator light source with very small scale. The lattice is very simple to ensure its compactness, while the beam parameters remain flexible to industry needs.  
DOI • reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB036  
About • Received ※ 30 June 2023 — Revised ※ 10 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 25 December 2023
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MOPB037 Generalized Longitudinal Strong Focusing: A Ring-Based Beam Manipulation Technique storage-ring, laser, bunching, emittance 85
 
  • Z.Z. Li, X.J. Deng, Z. Pan, C.-X. Tang
    TUB, Beijing, People’s Republic of China
  • A. Chao
    SLAC, Menlo Park, California, USA
 
  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.  
DOI • reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB037  
About • Received ※ 28 June 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 20 June 2024
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MOPB039 Low-Alpha Storage Ring Design for Steady-State Microbunching to Generate EUV Radiation storage-ring, lattice, electron, coupling 88
 
  • Z. Pan, A. Chao, X.J. Deng, W.-H. Huang, Z.Z. Li, C.-X. Tang
    TUB, Beijing, People’s Republic of China
 
  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.  
DOI • reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB039  
About • Received ※ 03 July 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 31 December 2023
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TUPB010 Dynamics Design on 70-250Mev Proton Linac proton, acceleration, linac, lattice 102
 
  • Y.F. Yang, Z. Li, P.T. Lin, Z.Q. Ren, X.M. Wan
    SCU, Chengdu, People’s Republic of China
 
  Charged proton beams have broad application prospects, and research on compact S-band proton linear accelerators is increasingly heating up in recent years. For radiation therapy, to achieve the conventional penetration range of water-equivalent tissues, protons with energy of 70 to 230MeV are required. The design of electromagnetic structure is closely related to particle dynamics design. A flexible and controllable particle dynamic tracking code (PDT) through both traveling wave and standing wave acceleration has been compiled to simulate particle trajectory and satisfy automatic tuning of the various components in the entire acceleration chain. The linac with a total length of approximately 8.2m composed of 16 tanks of backward traveling wave structures and permanent magnet quadrupole lenses was designed, operating at an RF frequency of 2.856GHz with a target acceleration gradient of 30MV/m, and accelerating proton beam from 70MeV to 250MeV while maintaining low emittance and high transmission efficiency.  
DOI • reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB010  
About • Received ※ 09 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 11 August 2023  
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TUPB026 Design of a Synchrotron for Proton FLASH Radiotherapy Based on Fast Variable-Energy Bunch Splitting proton, synchrotron, extraction, kicker 141
 
  • Y. Li, X.W. Wang, Q.Z. Xing, H.J. Yao, S.X. Zheng
    TUB, Beijing, People’s Republic of China
 
  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.  
DOI • reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB026  
About • Received ※ 29 June 2023 — Revised ※ 10 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 28 May 2024
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