Beam steering involves the calibration of the angle and position at which a particle accelerator's electron beam is incident upon the x-ray target with respect to the rotation axis of the collimator. Beam Steering is an essential task for light sources. The Linac To Undulator is very difficult to steer and aim due to the changes of each use of the accelerator there must be re-calibration of magnets. However with each use of the Beamline its current method of steering runs into issues when faced with calibrating angles and positions. Human operators spend a substantial amount of time and resources on the task. We developed multiple different feed-forward-neural networks with varying hyper-parameters, inputs, and outputs, seeking to compare their performance. Specifically, our smaller models with 33 inputs and 13 outputs outperformed the larger models with 73 inputs and 50 outputs. We propose the following explanations for this lack of performance in larger models. First, a lack of training time and computational power limited the ability of our models to mature. Given more time, our models would outperform SVD. Second, when the input size of the model increases the noise increases as well. In this case more inputs corresponded to a greater length upon the LINAC accelerator. Less specific and larger models that seek to make more predictions will inherently perform worse than SVD.
{"title":"Beamline Steering Using Deep Learning Models","authors":"Dexter Allen, Isaac Kante, Dorian Bohler","doi":"arxiv-2408.13657","DOIUrl":"https://doi.org/arxiv-2408.13657","url":null,"abstract":"Beam steering involves the calibration of the angle and position at which a\u0000particle accelerator's electron beam is incident upon the x-ray target with\u0000respect to the rotation axis of the collimator. Beam Steering is an essential\u0000task for light sources. The Linac To Undulator is very difficult to steer and\u0000aim due to the changes of each use of the accelerator there must be\u0000re-calibration of magnets. However with each use of the Beamline its current\u0000method of steering runs into issues when faced with calibrating angles and\u0000positions. Human operators spend a substantial amount of time and resources on\u0000the task. We developed multiple different feed-forward-neural networks with\u0000varying hyper-parameters, inputs, and outputs, seeking to compare their\u0000performance. Specifically, our smaller models with 33 inputs and 13 outputs\u0000outperformed the larger models with 73 inputs and 50 outputs. We propose the\u0000following explanations for this lack of performance in larger models. First, a\u0000lack of training time and computational power limited the ability of our models\u0000to mature. Given more time, our models would outperform SVD. Second, when the\u0000input size of the model increases the noise increases as well. In this case\u0000more inputs corresponded to a greater length upon the LINAC accelerator. Less\u0000specific and larger models that seek to make more predictions will inherently\u0000perform worse than SVD.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. FuUniversity of Chicago, A. Badea. K. Folan Di PetrilloUniversity of Chicago, D. NeufferFermilab, D. StratakisFermilab
In the final cooling stages for a muon collider, the transverse emittances are reduced while the longitudinal emittance is allowed to increase. In previous studies, Final cooling used absorbers within very high field solenoids to cool low-momentum muons. Simulations of the systems did not reach the desired cooling design goals. In this study, we develop and optimize a different conceptual design for the final 4D cooling channel, which is based on using dense wedge absorbers. We used G4Beamline to simulate the channel and Python to generate and analyze particle distributions. We optimized the design parameters of the cooling channel and produced conceptual designs (corresponding to possible starting points for the input beam) which achieve transverse cooling in both x and y by a factor of $approx$ 3.5. These channels achieve a lower transverse and longitudinal emittance than the best previously published design.
在μ介子对撞机的最后冷却阶段，横向幅射会减小，而纵向幅射会增大。在以前的研究中，最终冷却使用了极高磁场螺线管内的吸收器来冷却低动量μ介子。对系统的模拟没有达到预期的冷却设计目标。在这项研究中，我们开发并优化了基于密集楔形吸收器的最终 4D 冷却通道的不同概念设计。我们使用 G4Beamline 对通道进行模拟，并使用 Python 生成和分析粒子分布。我们优化了冷却通道的设计参数，并产生了概念设计（对应于输入光束的可能起始点），这些设计在 x 和 y 方向上都实现了 3.5 倍的横向冷却。这些通道的横向和纵向幅射均低于以前公布的最佳设计。
{"title":"Final Cooling With Thick Wedges for a Muon Collider","authors":"D. FuUniversity of Chicago, A. Badea. K. Folan Di PetrilloUniversity of Chicago, D. NeufferFermilab, D. StratakisFermilab","doi":"arxiv-2408.12696","DOIUrl":"https://doi.org/arxiv-2408.12696","url":null,"abstract":"In the final cooling stages for a muon collider, the transverse emittances\u0000are reduced while the longitudinal emittance is allowed to increase. In\u0000previous studies, Final cooling used absorbers within very high field solenoids\u0000to cool low-momentum muons. Simulations of the systems did not reach the\u0000desired cooling design goals. In this study, we develop and optimize a\u0000different conceptual design for the final 4D cooling channel, which is based on\u0000using dense wedge absorbers. We used G4Beamline to simulate the channel and\u0000Python to generate and analyze particle distributions. We optimized the design\u0000parameters of the cooling channel and produced conceptual designs\u0000(corresponding to possible starting points for the input beam) which achieve\u0000transverse cooling in both x and y by a factor of $approx$ 3.5. These channels\u0000achieve a lower transverse and longitudinal emittance than the best previously\u0000published design.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Conrad Caliari, Adrian Oeftiger, Oliver Boine-Frankenheim
We present the first experimental validation of the Deep Lie Map Network (DLMN) approach for recovering both linear and non-linear optics in a synchrotron. The DLMN facilitates the construction of a detailed accelerator model by integrating charged particle dynamics with machine learning methodology in a data-driven framework. The primary observable is the centroid motion over a limited number of turns, captured by beam position monitors. The DLMN produces an updated description of the accelerator in terms of magnetic multipole components, which can be directly utilized in established accelerator physics tools and tracking codes for further analysis. In this study, we apply the DLMN to the SIS18 hadron synchrotron at GSI for the first time. We discuss the validity of the recovered linear and non-linear optics, including quadrupole and sextupole errors, and compare our results with alternative methods, such as the LOCO fit of a measured orbit response matrix and the evaluation of resonance driving terms. The small number of required trajectory measurements, one for linear and three for non-linear optics reconstruction, demonstrates the method's time efficiency. Our findings indicate that the DLMN is well-suited for identifying linear optics, and the recovery of non-linear optics is achievable within the capabilities of the current beam position monitor system. We demonstrate the application of DLMN results through simulated resonance diagrams in tune space and their comparison with measurements. The DLMN provides a novel tool for analyzing the causal origins of resonances and exploring potential compensation schemes.
{"title":"Beam-based Identification of Magnetic Field Errors in a Synchrotron using Deep Lie Map Networks","authors":"Conrad Caliari, Adrian Oeftiger, Oliver Boine-Frankenheim","doi":"arxiv-2408.11677","DOIUrl":"https://doi.org/arxiv-2408.11677","url":null,"abstract":"We present the first experimental validation of the Deep Lie Map Network\u0000(DLMN) approach for recovering both linear and non-linear optics in a\u0000synchrotron. The DLMN facilitates the construction of a detailed accelerator\u0000model by integrating charged particle dynamics with machine learning\u0000methodology in a data-driven framework. The primary observable is the centroid\u0000motion over a limited number of turns, captured by beam position monitors. The\u0000DLMN produces an updated description of the accelerator in terms of magnetic\u0000multipole components, which can be directly utilized in established accelerator\u0000physics tools and tracking codes for further analysis. In this study, we apply\u0000the DLMN to the SIS18 hadron synchrotron at GSI for the first time. We discuss the validity of the recovered linear and non-linear optics,\u0000including quadrupole and sextupole errors, and compare our results with\u0000alternative methods, such as the LOCO fit of a measured orbit response matrix\u0000and the evaluation of resonance driving terms. The small number of required\u0000trajectory measurements, one for linear and three for non-linear optics\u0000reconstruction, demonstrates the method's time efficiency. Our findings\u0000indicate that the DLMN is well-suited for identifying linear optics, and the\u0000recovery of non-linear optics is achievable within the capabilities of the\u0000current beam position monitor system. We demonstrate the application of DLMN\u0000results through simulated resonance diagrams in tune space and their comparison\u0000with measurements. The DLMN provides a novel tool for analyzing the causal\u0000origins of resonances and exploring potential compensation schemes.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"283 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. BanaszkiewiczWroclaw University of Science and Technology, Wroclaw, Poland, M. ChorowskiWroclaw University of Science and Technology, Wroclaw, Poland, P. DudaWroclaw University of Science and Technology, Wroclaw, Poland, M. StanclikWroclaw University of Science and Technology, Wroclaw, Poland, R. DhuleyFermi National Accelerator Laboratory, Batavia, USA, A. MartinezFermi National Accelerator Laboratory, Batavia, USA, W. SoyarsFermi National Accelerator Laboratory, Batavia, USA
The PIP-II linac Cryogenic Distribution System (CDS) is characterized by extremely small heat inflows and robust mechanical design. It consists of a Distribution Valve Box (DVB), Intermediate Transfer Line, Tunnel Transfer Line, comprising 25 Bayonet Cans, and ends with a Turnaround Can. Multiple helium streams, each characterized by distinct helium parameters, flow through each of these elements. The CDS geometry allows maintaining an acceptable pressure drop for each helium stream, considering the planned flows and helium parameters in different operation modes. This is particularly crucial for the return line of helium vapors, which return from cryomodules to the cold compressors and thus have very restrictive pressure drop requirements. On both sides of the DVB there are fixed supports for process pipes. One of the DVB design challenges was to route the process pipes in such a way that their shape provided sufficient compensation for thermal shrinkage. This ensures th at the forces resulting from thermal shrinkage acting on the cryogenic valves remain at a level acceptable to the manufacturer. The required thermal budget of the CDS was achieved by thermo-mechanical optimization of its components, like process pipes fixed supports in Bayonet Cans.
{"title":"PIP-II Linac Cryogenic Distribution System Design Challenges","authors":"T. BanaszkiewiczWroclaw University of Science and Technology, Wroclaw, Poland, M. ChorowskiWroclaw University of Science and Technology, Wroclaw, Poland, P. DudaWroclaw University of Science and Technology, Wroclaw, Poland, M. StanclikWroclaw University of Science and Technology, Wroclaw, Poland, R. DhuleyFermi National Accelerator Laboratory, Batavia, USA, A. MartinezFermi National Accelerator Laboratory, Batavia, USA, W. SoyarsFermi National Accelerator Laboratory, Batavia, USA","doi":"arxiv-2408.11018","DOIUrl":"https://doi.org/arxiv-2408.11018","url":null,"abstract":"The PIP-II linac Cryogenic Distribution System (CDS) is characterized by\u0000extremely small heat inflows and robust mechanical design. It consists of a\u0000Distribution Valve Box (DVB), Intermediate Transfer Line, Tunnel Transfer Line,\u0000comprising 25 Bayonet Cans, and ends with a Turnaround Can. Multiple helium\u0000streams, each characterized by distinct helium parameters, flow through each of\u0000these elements. The CDS geometry allows maintaining an acceptable pressure drop\u0000for each helium stream, considering the planned flows and helium parameters in\u0000different operation modes. This is particularly crucial for the return line of\u0000helium vapors, which return from cryomodules to the cold compressors and thus\u0000have very restrictive pressure drop requirements. On both sides of the DVB\u0000there are fixed supports for process pipes. One of the DVB design challenges\u0000was to route the process pipes in such a way that their shape provided\u0000sufficient compensation for thermal shrinkage. This ensures th at the forces\u0000resulting from thermal shrinkage acting on the cryogenic valves remain at a\u0000level acceptable to the manufacturer. The required thermal budget of the CDS\u0000was achieved by thermo-mechanical optimization of its components, like process\u0000pipes fixed supports in Bayonet Cans.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. LuninFermilab, Batavia, USA, T. KhabiboullineFermilab, Batavia, USA, A. SukhanovFermilab, Batavia, USA, V. YakovlevFermilab, Batavia, USA
Fermilab recently completed production and testing of 1.3 GHz cryomodules for the LCLS-II project. Each cryomodule consists of eight TESLA-shaped superconducting elliptical cavities equipped with two High Order Mode (HOM) coupler ports. Measurement of the HOM spectrum is part of the incoming quality control of cavities at room temperature and the final qualification cold test of cryomodules at the Cryomodule Test Facility (CMTF). In this paper we describe the procedure for measuring the HOM spectrum along with further data processing. Finally, we present accumulated statistics of individual HOM frequencies and quality factors related to various cavity vendors and discuss the possible contribution of HOMs to heat loads and beam dynamics.
费米实验室最近完成了用于 LCLS-II 项目的 1.3 GHz 低温模块的生产和测试。每个低温模块由八个 TESLA 形超导椭圆腔组成，配备两个高阶模式（HOM）耦合器端口。对高阶模频谱的测量是室温下空腔进场质量控制和低温模组测试设施（CMTF）低温模组最终鉴定的一部分。在本文中，我们介绍了测量 HOM 光谱的程序以及进一步的数据处理。最后，我们介绍了与各种腔体供应商相关的单个 HOM 频率和质量因子的累积统计数据，并讨论了 HOM 对热负荷和光束动力学可能造成的影响。
{"title":"Results of High Order Modes Spectra Measurements in 1.3 GHz Cavities for LCLS-II","authors":"A. LuninFermilab, Batavia, USA, T. KhabiboullineFermilab, Batavia, USA, A. SukhanovFermilab, Batavia, USA, V. YakovlevFermilab, Batavia, USA","doi":"arxiv-2408.10991","DOIUrl":"https://doi.org/arxiv-2408.10991","url":null,"abstract":"Fermilab recently completed production and testing of 1.3 GHz cryomodules for\u0000the LCLS-II project. Each cryomodule consists of eight TESLA-shaped\u0000superconducting elliptical cavities equipped with two High Order Mode (HOM)\u0000coupler ports. Measurement of the HOM spectrum is part of the incoming quality\u0000control of cavities at room temperature and the final qualification cold test\u0000of cryomodules at the Cryomodule Test Facility (CMTF). In this paper we\u0000describe the procedure for measuring the HOM spectrum along with further data\u0000processing. Finally, we present accumulated statistics of individual HOM\u0000frequencies and quality factors related to various cavity vendors and discuss\u0000the possible contribution of HOMs to heat loads and beam dynamics.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents a design concept of an HTS/LTS hybrid dipole with 50 mm aperture and 20 T nominal field based on a cos-theta coil and a cold iron yoke. The HTS part of magnet coil uses REBCO Twisted Stacked Tape cable. The LTS part is graded and made of two Nb3Sn Rutherford cables. Due to high sensitivity of HTS/LTS coils to large stresses and strains at high fields, a Stress Management (SM) concept combined with the cos-theta coil geometry is used. The results of magnet magnetic analysis are presented and discussed.
本文介绍了一种 HTS/LTS 混合偶极子的设计理念，该偶极子具有 50 mm 的孔径和 20 T 的额定磁场，基于一个 cos-theta 线圈和一个冷铁轭。LTS 部分是分级的，由两根 Nb3Sn 卢瑟福电缆组成。由于 HTS/LTS 线圈在高磁场下对大应力和应变非常敏感，因此采用了应力管理（SM）概念与 cos-theta 线圈几何形状相结合。本文介绍并讨论了磁体磁性分析的结果。
{"title":"Conceptual Design of A 20 T Dipole Based on Hybrid REBCO/Nb3Sn Cos-theta Coil*","authors":"A. V. ZlobinFermilab, Batavia, IL, USA","doi":"arxiv-2408.11023","DOIUrl":"https://doi.org/arxiv-2408.11023","url":null,"abstract":"This paper presents a design concept of an HTS/LTS hybrid dipole with 50 mm\u0000aperture and 20 T nominal field based on a cos-theta coil and a cold iron yoke.\u0000The HTS part of magnet coil uses REBCO Twisted Stacked Tape cable. The LTS part\u0000is graded and made of two Nb3Sn Rutherford cables. Due to high sensitivity of\u0000HTS/LTS coils to large stresses and strains at high fields, a Stress Management\u0000(SM) concept combined with the cos-theta coil geometry is used. The results of\u0000magnet magnetic analysis are presented and discussed.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"181 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jeffrey Eldred, Michael Balcewicz, Frank Schmidt, Benjamin Simons
An overview is given of the methods and preliminary results from dedicated beam studies on three topics conducted over five days in July 2023. In the first study, the Fermilab Booster magnets were held constant at magnetic fields corresponding to the injection energy. The beam loss and emittance growth were observed under varying intensity, tunes, and sextupole resonances. The corresponding beam conditions were also simulated with the MADX-SC code~cite{Schmidt:2644660}. In the second study, measurements of the vertical half-integer resonance and correction methods are conducted for high-intensity beams ramping in the Booster. Finally, syncho-betatron instabilities are observed during transition-crossing in the Booster under strong space-charge conditions.
{"title":"Preliminary Results of the 2023 International Fermilab Booster Studies","authors":"Jeffrey Eldred, Michael Balcewicz, Frank Schmidt, Benjamin Simons","doi":"arxiv-2408.08987","DOIUrl":"https://doi.org/arxiv-2408.08987","url":null,"abstract":"An overview is given of the methods and preliminary results from dedicated\u0000beam studies on three topics conducted over five days in July 2023. In the\u0000first study, the Fermilab Booster magnets were held constant at magnetic fields\u0000corresponding to the injection energy. The beam loss and emittance growth were\u0000observed under varying intensity, tunes, and sextupole resonances. The\u0000corresponding beam conditions were also simulated with the MADX-SC\u0000code~cite{Schmidt:2644660}. In the second study, measurements of the vertical\u0000half-integer resonance and correction methods are conducted for high-intensity\u0000beams ramping in the Booster. Finally, syncho-betatron instabilities are\u0000observed during transition-crossing in the Booster under strong space-charge\u0000conditions.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Agapov, S. Antipov, R. Bartolini, R. Brinkmann, Y-C. Chae, E. C. Cortes-Garcia, D. Einfeld, T. Hellert, M. Huening, M. A. Jebramcik, J. Keil, C. Li, L. Malina, R. Wanzenberg
The PETRA IV project for upgrading the 2.3 km 6 GeV PETRA III storage ring to a diffraction-limited synchrotron radiation source is nearing the end of its detailed technical design phase. We present the ring lattice based on the hybrid six-bend achromat (H6BA) cell and a detailed evaluation of its beam dynamics performance. Design challenges as well as unique opportunities associated with a low emittance ring of a large size are discussed.
PETRA IV 项目旨在将 2.3 公里长的 6 GeV PETRA III 储存环升级为衍射极限同步辐射源，其详细技术设计阶段已接近尾声。我们介绍了基于混合六弯消色差（H6BA）单元的环形晶格，以及对其光束动力学性能的详细评估。我们还讨论了与大尺寸低发射率环相关的设计挑战和独特机遇。
{"title":"Beam dynamics performance of the proposed PETRA IV storage ring","authors":"I. Agapov, S. Antipov, R. Bartolini, R. Brinkmann, Y-C. Chae, E. C. Cortes-Garcia, D. Einfeld, T. Hellert, M. Huening, M. A. Jebramcik, J. Keil, C. Li, L. Malina, R. Wanzenberg","doi":"arxiv-2408.07995","DOIUrl":"https://doi.org/arxiv-2408.07995","url":null,"abstract":"The PETRA IV project for upgrading the 2.3 km 6 GeV PETRA III storage ring to\u0000a diffraction-limited synchrotron radiation source is nearing the end of its\u0000detailed technical design phase. We present the ring lattice based on the\u0000hybrid six-bend achromat (H6BA) cell and a detailed evaluation of its beam\u0000dynamics performance. Design challenges as well as unique opportunities\u0000associated with a low emittance ring of a large size are discussed.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Katherine D. Ranjbar, Emily Snyder, Alice Snyder, Vahid H. Ranjbar
The use of an intense ultrashort laser pulse to induce electron polarization has been proposed in existing literature. The Python programming language is used to recreate the local constant crossed-field approximation (LCFA) with the aim of determining values for transverse polarization given a nonzero initial polarization. It has been shown that over multiple laser shots, lower values of the quantum efficiency parameter are associated with higher transverse polarization output, yet require a greater number of shots to attain maximal polarization. Moreover, the quantum efficiency parameter has been redefined as a function of intensity for a Ti:sapphire laser necessary to induce polarization in the Electron-Ion Collide
{"title":"Estimate of Multi-Shot Laser-Induced Polarization for High Energy Electrons","authors":"Katherine D. Ranjbar, Emily Snyder, Alice Snyder, Vahid H. Ranjbar","doi":"arxiv-2408.08917","DOIUrl":"https://doi.org/arxiv-2408.08917","url":null,"abstract":"The use of an intense ultrashort laser pulse to induce electron polarization\u0000has been proposed in existing literature. The Python programming language is\u0000used to recreate the local constant crossed-field approximation (LCFA) with the\u0000aim of determining values for transverse polarization given a nonzero initial\u0000polarization. It has been shown that over multiple laser shots, lower values of\u0000the quantum efficiency parameter are associated with higher transverse\u0000polarization output, yet require a greater number of shots to attain maximal\u0000polarization. Moreover, the quantum efficiency parameter has been redefined as\u0000a function of intensity for a Ti:sapphire laser necessary to induce\u0000polarization in the Electron-Ion Collide","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mahindra Rautela, Alan Williams, Alexander Scheinker
Charged particle dynamics under the influence of electromagnetic fields is a challenging spatiotemporal problem. Many high performance physics-based simulators for predicting behavior in a charged particle beam are computationally expensive, limiting their utility for solving inverse problems online. The problem of estimating upstream six-dimensional phase space given downstream measurements of charged particles in an accelerator is an inverse problem of growing importance. This paper introduces a reverse Latent Evolution Model (rLEM) designed for temporal inversion of forward beam dynamics. In this two-step self-supervised deep learning framework, we utilize a Conditional Variational Autoencoder (CVAE) to project 6D phase space projections of a charged particle beam into a lower-dimensional latent distribution. Subsequently, we autoregressively learn the inverse temporal dynamics in the latent space using a Long Short-Term Memory (LSTM) network. The coupled CVAE-LSTM framework can predict 6D phase space projections across all upstream accelerating sections based on single or multiple downstream phase space measurements as inputs. The proposed model also captures the aleatoric uncertainty of the high-dimensional input data within the latent space. This uncertainty, which reflects potential uncertain measurements at a given module, is propagated through the LSTM to estimate uncertainty bounds for all upstream predictions, demonstrating the robustness of the LSTM against in-distribution variations in the input data.
{"title":"Time-inversion of spatiotemporal beam dynamics using uncertainty-aware latent evolution reversal","authors":"Mahindra Rautela, Alan Williams, Alexander Scheinker","doi":"arxiv-2408.07847","DOIUrl":"https://doi.org/arxiv-2408.07847","url":null,"abstract":"Charged particle dynamics under the influence of electromagnetic fields is a\u0000challenging spatiotemporal problem. Many high performance physics-based\u0000simulators for predicting behavior in a charged particle beam are\u0000computationally expensive, limiting their utility for solving inverse problems\u0000online. The problem of estimating upstream six-dimensional phase space given\u0000downstream measurements of charged particles in an accelerator is an inverse\u0000problem of growing importance. This paper introduces a reverse Latent Evolution\u0000Model (rLEM) designed for temporal inversion of forward beam dynamics. In this\u0000two-step self-supervised deep learning framework, we utilize a Conditional\u0000Variational Autoencoder (CVAE) to project 6D phase space projections of a\u0000charged particle beam into a lower-dimensional latent distribution.\u0000Subsequently, we autoregressively learn the inverse temporal dynamics in the\u0000latent space using a Long Short-Term Memory (LSTM) network. The coupled\u0000CVAE-LSTM framework can predict 6D phase space projections across all upstream\u0000accelerating sections based on single or multiple downstream phase space\u0000measurements as inputs. The proposed model also captures the aleatoric\u0000uncertainty of the high-dimensional input data within the latent space. This\u0000uncertainty, which reflects potential uncertain measurements at a given module,\u0000is propagated through the LSTM to estimate uncertainty bounds for all upstream\u0000predictions, demonstrating the robustness of the LSTM against in-distribution\u0000variations in the input data.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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