Pub Date : 2018-08-01DOI: 10.1109/AAC.2018.8659423
Brendan O'Shea, Navid Vafaei-Naiafabadi
A summary of presentations, posters and discussions of the Beam-driven Acceleration Working Group during the 2018 Advanced Accelerator Concepts conference.
在2018年先进加速器概念会议期间，光束驱动加速工作组的演讲、海报和讨论摘要。
{"title":"Summary of Working Group 4: Beam-driven Acceleration","authors":"Brendan O'Shea, Navid Vafaei-Naiafabadi","doi":"10.1109/AAC.2018.8659423","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659423","url":null,"abstract":"A summary of presentations, posters and discussions of the Beam-driven Acceleration Working Group during the 2018 Advanced Accelerator Concepts conference.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"245 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116803705","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}
Pub Date : 2018-08-01DOI: 10.1109/AAC.2018.8659424
Dongsung Kim, H. Andrews, R. Fleming, J. Lewellen, K. Nichols, V. Pavlenko, D. Shchegolkov, E. Simakov
We present the results of beam divergence studies for the diamond field emitter array (DFEA) cathodes producing high-current-density electron beams. At Los Alamos National Laboratory (LANL), we fabricate and test the micrometer-scale diamond pyramids with nanometer-scale sharp tips for use as an electron beam source for a compact dielectric laser accelerator. For the beam divergence measurements, we assembled a test stand consisting of a DFEA cathode, a small mesh aperture anode, and a screen representing of a sapphire disk coated with ZnO (AZO) for beam visualization. A negative voltage of about 40 keV is applied to the cathode, and the mesh and the screen are kept at ground. We record the spot size corresponding to the size of the electron beam on the AZO screen past the mesh anode at different mesh to screen distances. We also conduct the beam dynamics simulations with General particle Tracer (GPT). In this paper, we present the results of the experimental measurements and GPT simulations, along with calculations of the beam's divergence.
本文介绍了金刚石场发射极阵列阴极产生高电流密度电子束的发散研究结果。在洛斯阿拉莫斯国家实验室(Los Alamos National Laboratory, LANL)，我们制造并测试了微米级的钻石金字塔，其尖端为纳米级，可作为紧凑型介电激光加速器的电子束源。为了测量光束发散，我们组装了一个试验台，该试验台由DFEA阴极、一个小网格孔阳极和一个代表涂有ZnO (AZO)的蓝宝石盘的屏幕组成，用于光束可视化。阴极上施加约40 keV的负电压，栅极和屏幕保持在地面上。我们记录了与电子束尺寸相对应的光斑尺寸，这些光斑尺寸在不同的栅极到栅极的距离上通过AZO屏幕。我们还用通用粒子追踪器(GPT)进行了光束动力学模拟。在本文中，我们给出了实验测量和GPT模拟的结果，以及光束散度的计算。
{"title":"Study of the Beam Divergence in Diamond Field Emitter Array Cathodes","authors":"Dongsung Kim, H. Andrews, R. Fleming, J. Lewellen, K. Nichols, V. Pavlenko, D. Shchegolkov, E. Simakov","doi":"10.1109/AAC.2018.8659424","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659424","url":null,"abstract":"We present the results of beam divergence studies for the diamond field emitter array (DFEA) cathodes producing high-current-density electron beams. At Los Alamos National Laboratory (LANL), we fabricate and test the micrometer-scale diamond pyramids with nanometer-scale sharp tips for use as an electron beam source for a compact dielectric laser accelerator. For the beam divergence measurements, we assembled a test stand consisting of a DFEA cathode, a small mesh aperture anode, and a screen representing of a sapphire disk coated with ZnO (AZO) for beam visualization. A negative voltage of about 40 keV is applied to the cathode, and the mesh and the screen are kept at ground. We record the spot size corresponding to the size of the electron beam on the AZO screen past the mesh anode at different mesh to screen distances. We also conduct the beam dynamics simulations with General particle Tracer (GPT). In this paper, we present the results of the experimental measurements and GPT simulations, along with calculations of the beam's divergence.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121925447","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}
Pub Date : 2018-08-01DOI: 10.18429/JACOW-IPAC2018-THPAL024
R. Fleming, H. Andrews, K. Bishofberger, Dongsung Kim, J. Lewellen, K. Nichols, D. Shchegolkov, E. Simakov
We present the design and initial test results for a simple, variable-focus solenoidal lens with integrated emittance filtering. The design was developed as a first-iteration injection optics solution for transport of a beam from a field-emitter cathode into a dielectric laser accelerator structure. The design is easy to fabricate and, while based on permanent magnets, can be readily modified to allow for remote control of the focal length. The emittance is controlled via a selection of collimating irises. The focal length can be changed by altering the spacing between the two permanent ring magnets. This allowed us to focus a 1.6 μA beam to a 10 μm spot size.
{"title":"A Simple Variable Focus Lens for Field-Emitter Cathodes","authors":"R. Fleming, H. Andrews, K. Bishofberger, Dongsung Kim, J. Lewellen, K. Nichols, D. Shchegolkov, E. Simakov","doi":"10.18429/JACOW-IPAC2018-THPAL024","DOIUrl":"https://doi.org/10.18429/JACOW-IPAC2018-THPAL024","url":null,"abstract":"We present the design and initial test results for a simple, variable-focus solenoidal lens with integrated emittance filtering. The design was developed as a first-iteration injection optics solution for transport of a beam from a field-emitter cathode into a dielectric laser accelerator structure. The design is easy to fabricate and, while based on permanent magnets, can be readily modified to allow for remote control of the focal length. The emittance is controlled via a selection of collimating irises. The focal length can be changed by altering the spacing between the two permanent ring magnets. This allowed us to focus a 1.6 μA beam to a 10 μm spot size.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114175438","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}
Pub Date : 2018-08-01DOI: 10.1109/AAC.2018.8659432
R. Lehe, W. An
Working group 2 (Computations for Accelerator Physics) reviewed recent progress in numerical simulations for advanced accelerators. This included discussions of algorithmic and code developments, as well as applications to particular types of accelerators.
{"title":"Summary of Working Group 2: Computations for Accelerator Physics","authors":"R. Lehe, W. An","doi":"10.1109/AAC.2018.8659432","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659432","url":null,"abstract":"Working group 2 (Computations for Accelerator Physics) reviewed recent progress in numerical simulations for advanced accelerators. This included discussions of algorithmic and code developments, as well as applications to particular types of accelerators.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128191424","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}
Pub Date : 2018-08-01DOI: 10.1109/AAC.2018.8659411
C. Benedetti, C. Schroeder, T. Mehrling, B. Djordjević, S. Bulanov, C. Geddes, E. Esarey, W. Leemans
Particle-in-cell modeling of 10 GeV-Class laser-plasma accelerators, where a short and intense laser pulse with an energy of tens of Joules propagates in a plasma with a length of a few tens of cm and a density ~ 1017 cm−3, is a computationally challenging task, requiring several tens of millions of core hours on today's supercomputers. In this paper, we present simulations results, obtained with the computationally-efficient code INF&RNO [8]–[10], concerning the production of 10 GeV-class electron beams in a 20 cm plasma under realistic conditions using the PW BELLA laser at the Lawrence Berkeley National Laboratory (LBNL). The computational savings provided by INF&RNO allows for extensive parameter scans and detailed characterization of the accelerator performance.
{"title":"INF&RNO Modeling of 10 GeV-Class Electron Beams from a Laser-Plasma Accelerator Driven by the BELLA Laser","authors":"C. Benedetti, C. Schroeder, T. Mehrling, B. Djordjević, S. Bulanov, C. Geddes, E. Esarey, W. Leemans","doi":"10.1109/AAC.2018.8659411","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659411","url":null,"abstract":"Particle-in-cell modeling of 10 GeV-Class laser-plasma accelerators, where a short and intense laser pulse with an energy of tens of Joules propagates in a plasma with a length of a few tens of cm and a density ~ 1017 cm−3, is a computationally challenging task, requiring several tens of millions of core hours on today's supercomputers. In this paper, we present simulations results, obtained with the computationally-efficient code INF&RNO [8]–[10], concerning the production of 10 GeV-class electron beams in a 20 cm plasma under realistic conditions using the PW BELLA laser at the Lawrence Berkeley National Laboratory (LBNL). The computational savings provided by INF&RNO allows for extensive parameter scans and detailed characterization of the accelerator performance.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123727652","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}
Pub Date : 2018-08-01DOI: 10.1109/AAC.2018.8659445
J. Dawson, M. Polyanskiy
This paper summarizes the trends in laser technology and facilities for advanced accelerator research as presented at the Advanced Accelerator Concepts Workshop held in Breckenridge, CO between August 12 and August 17, 2018. A synopsis of how contributions presented at the conference fit within these trends is provided. Readers may then refer to the full references for additional detail.
{"title":"Summary of Working Group 8: Advanced Laser and Beam Technology and Facilities","authors":"J. Dawson, M. Polyanskiy","doi":"10.1109/AAC.2018.8659445","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659445","url":null,"abstract":"This paper summarizes the trends in laser technology and facilities for advanced accelerator research as presented at the Advanced Accelerator Concepts Workshop held in Breckenridge, CO between August 12 and August 17, 2018. A synopsis of how contributions presented at the conference fit within these trends is provided. Readers may then refer to the full references for additional detail.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121746831","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}
Pub Date : 2018-08-01DOI: 10.1109/AAC.2018.8659428
L. Fan-Chiang, H. Mao, W. Leemans
The ability to precisely shape gas jets for controlled injection of electrons in laser plasma accelerators (LPAs) is crucial for developing high quality electron beams. Verifying tailored density profiles has called for more detailed gas density diagnostics than those traditionally used. Most diagnostics give line-of-sight measurements, integrating over and blurring sharp asymmetric features. In this study, planar laser-induced fluorescence (PLIF) has been prototyped for characterizing laser plasma accelerator gas jet targets. PLIF has the distinct advantage of isolating a two-dimensional slice of the jet plume using a laser sheet. As a demonstration, gas jets whose flows were intercepted by a razor blade were characterized with PLIF. Fluorescent slices of the gas jet resulted in high resolution images which revealed changes in characteristic flow parameters with change in blade position. It was shown that PLIF is able to resolve thin features such as gas density shocks and other features on scales relevant for tailored LPA gas jet targets.
{"title":"Planar Laser-Induced Fluorescence Developed for Laser Plasma Accelerator Targets","authors":"L. Fan-Chiang, H. Mao, W. Leemans","doi":"10.1109/AAC.2018.8659428","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659428","url":null,"abstract":"The ability to precisely shape gas jets for controlled injection of electrons in laser plasma accelerators (LPAs) is crucial for developing high quality electron beams. Verifying tailored density profiles has called for more detailed gas density diagnostics than those traditionally used. Most diagnostics give line-of-sight measurements, integrating over and blurring sharp asymmetric features. In this study, planar laser-induced fluorescence (PLIF) has been prototyped for characterizing laser plasma accelerator gas jet targets. PLIF has the distinct advantage of isolating a two-dimensional slice of the jet plume using a laser sheet. As a demonstration, gas jets whose flows were intercepted by a razor blade were characterized with PLIF. Fluorescent slices of the gas jet resulted in high resolution images which revealed changes in characteristic flow parameters with change in blade position. It was shown that PLIF is able to resolve thin features such as gas density shocks and other features on scales relevant for tailored LPA gas jet targets.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122284459","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}
Pub Date : 2018-08-01DOI: 10.1109/AAC.2018.8659425
S. Kuzikov, S. Antipov, A. Vikharev, A. Savilov, E. Gomez
We propose a high-efficiency regime of a “multi-stage” trapping in a Free Electron Laser (FEL). This FEL scheme uses strongly tapered flying radio frequency (RF) undulator sections to be fed by short (nanosecond) gigawatt-power microwave pulses produced by existing Backward Wave Oscillators (BWOs). In this regime, phase locking of the RF sources is not necessary. The proposed method promises an efficiency at level of several percents in FELs driven by modern laser-plasma accelerators producing bunches with ~1 % energy spread. Low-power tests with 30 GHz undulator prototypes have shown that up to 50% tapering of the periodicity is obtainable. Multi-stage tapering is also appealing for X-ray FEL oscillators (XFELO). An XFELO, consisted of not tapered and tapered undulators, can have self-modulated Q-factor of a cavity. This allows XFELO to start up faster and at the same time to provide a high efficiency in steady state regime. Multi-staging might also improve an XFELO concept where the first uniform undulator is inserted in an optical cavity, but the second external undulator works in Self-Amplified Spontaneous Emission (SASE) regime consuming the microbunched electron beam generated by the first undulator. The idea is based on the use of smart reflecting mirrors in a cavity with complicated shapes. These reflectors due to a proper design produce an eigenmode with zero-field in the center of one of mirrors so that electrons can be out-coupled flying straight through a hole in this mirror.
{"title":"Free Electron Lasers Based on Multi-Stage Tapered RF Wigglers","authors":"S. Kuzikov, S. Antipov, A. Vikharev, A. Savilov, E. Gomez","doi":"10.1109/AAC.2018.8659425","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659425","url":null,"abstract":"We propose a high-efficiency regime of a “multi-stage” trapping in a Free Electron Laser (FEL). This FEL scheme uses strongly tapered flying radio frequency (RF) undulator sections to be fed by short (nanosecond) gigawatt-power microwave pulses produced by existing Backward Wave Oscillators (BWOs). In this regime, phase locking of the RF sources is not necessary. The proposed method promises an efficiency at level of several percents in FELs driven by modern laser-plasma accelerators producing bunches with ~1 % energy spread. Low-power tests with 30 GHz undulator prototypes have shown that up to 50% tapering of the periodicity is obtainable. Multi-stage tapering is also appealing for X-ray FEL oscillators (XFELO). An XFELO, consisted of not tapered and tapered undulators, can have self-modulated Q-factor of a cavity. This allows XFELO to start up faster and at the same time to provide a high efficiency in steady state regime. Multi-staging might also improve an XFELO concept where the first uniform undulator is inserted in an optical cavity, but the second external undulator works in Self-Amplified Spontaneous Emission (SASE) regime consuming the microbunched electron beam generated by the first undulator. The idea is based on the use of smart reflecting mirrors in a cavity with complicated shapes. These reflectors due to a proper design produce an eigenmode with zero-field in the center of one of mirrors so that electrons can be out-coupled flying straight through a hole in this mirror.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115979114","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}
Pub Date : 2018-08-01DOI: 10.1109/AAC.2018.8659405
Yong Jiang, S. Shchelkunov, J. Hirshfield
There are tremendous challenges to provide a high intensity positron source capable of continuous beam delivery. It is particularly important to devise a high power (10-to-100 kW) production target with adequate heat dissipation, positron capture, and accelerator integration. Here a novel approach using a stationary target with beam dynamics manipulation is described. It is based on a few pairs of deflecting magnets to scan a high-power electron beam along a long track on the target, either in a linear raster or around a circle, and then combine the produced positrons back into an on-axis beam. Proper optics design of incident electron beam can significantly dilute the heat load and distribute evenly, thus avoid destructive focusing on a single spot, while achieving the ample production and collection of a positron beam. The fixed target assembly can allow a sufficient flow of the cooling water on the target perimeter to carry away the deposited heat without an undue temperature rise.
{"title":"Positron Production Target with Raster Beam","authors":"Yong Jiang, S. Shchelkunov, J. Hirshfield","doi":"10.1109/AAC.2018.8659405","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659405","url":null,"abstract":"There are tremendous challenges to provide a high intensity positron source capable of continuous beam delivery. It is particularly important to devise a high power (10-to-100 kW) production target with adequate heat dissipation, positron capture, and accelerator integration. Here a novel approach using a stationary target with beam dynamics manipulation is described. It is based on a few pairs of deflecting magnets to scan a high-power electron beam along a long track on the target, either in a linear raster or around a circle, and then combine the produced positrons back into an on-axis beam. Proper optics design of incident electron beam can significantly dilute the heat load and distribute evenly, thus avoid destructive focusing on a single spot, while achieving the ample production and collection of a positron beam. The fixed target assembly can allow a sufficient flow of the cooling water on the target perimeter to carry away the deposited heat without an undue temperature rise.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128679666","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}
Pub Date : 2018-08-01DOI: 10.1109/AAC.2018.8659426
T. Egenolf, U. Niedermayer, O. Boine-Frankenheim
In Dielectric Laser Accelerators (DLAs) apertures are in submicrometer range. Intensity effects caused by wake-fields are the critical limitations at relativistic energies. To estimate the intensity limits, we present simulations of longitudinal and transverse wakefields for different DLA grating geometries. These simulations enable to calculate the longitudinal beam loading limit. Additionally, coherent transverse beam stabilities are analyzed. Based on these studies, we estimate the influence of wakes on DLA experiments at 3 GeV planned at SwissFEL at the Paul Scherrer Institute (PSI). However, most models of transverse instabilities are valid only for linearized wakes, which holds at most in a fraction of the aperture. To take this into account, we outline the integration of a nonlinear wake kick in our simplified 6D particle tracking code DLAtrack6D. For verification, we compare both the linear and nonlinear tracking results to full Particle-In-Cell simulations.
{"title":"Intensity Limits by Wakefields in Relativistic Dielectric Laser Acceleration Grating Structures","authors":"T. Egenolf, U. Niedermayer, O. Boine-Frankenheim","doi":"10.1109/AAC.2018.8659426","DOIUrl":"https://doi.org/10.1109/AAC.2018.8659426","url":null,"abstract":"In Dielectric Laser Accelerators (DLAs) apertures are in submicrometer range. Intensity effects caused by wake-fields are the critical limitations at relativistic energies. To estimate the intensity limits, we present simulations of longitudinal and transverse wakefields for different DLA grating geometries. These simulations enable to calculate the longitudinal beam loading limit. Additionally, coherent transverse beam stabilities are analyzed. Based on these studies, we estimate the influence of wakes on DLA experiments at 3 GeV planned at SwissFEL at the Paul Scherrer Institute (PSI). However, most models of transverse instabilities are valid only for linearized wakes, which holds at most in a fraction of the aperture. To take this into account, we outline the integration of a nonlinear wake kick in our simplified 6D particle tracking code DLAtrack6D. For verification, we compare both the linear and nonlinear tracking results to full Particle-In-Cell simulations.","PeriodicalId":339772,"journal":{"name":"2018 IEEE Advanced Accelerator Concepts Workshop (AAC)","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123363444","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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