arXiv: Accelerator Physics最新文献

Developing a 50 MeV LPA-based Injector at ATHENA for a Compact Storage Ring 在ATHENA为紧凑型存储环开发50 MeV lpa注入器

arXiv: Accelerator Physics Pub Date : 2021-06-21 DOI: 10.5445/IR/1000134508

E. Panofski, Cora Braun, E. Bründermann, Julian Dirkwinkel, T. Eichner, B. Härer, T. Hülsenbusch, L. Hübner, S. Jalas, L. Jeppe, M. Kaluza, M. Kirchen, Andreas Maier, P. Messner, Anke-Susanne Müller, J. Osterhoff, G. Palmer, T. Parikh, A. Sävert, M. Schnepp, M. Trunk, P. A. Walker, C. Werle, C. Widmann, P. Winkler

{"title":"Developing a 50 MeV LPA-based Injector at ATHENA for a Compact Storage Ring","authors":"E. Panofski, Cora Braun, E. Bründermann, Julian Dirkwinkel, T. Eichner, B. Härer, T. Hülsenbusch, L. Hübner, S. Jalas, L. Jeppe, M. Kaluza, M. Kirchen, Andreas Maier, P. Messner, Anke-Susanne Müller, J. Osterhoff, G. Palmer, T. Parikh, A. Sävert, M. Schnepp, M. Trunk, P. A. Walker, C. Werle, C. Widmann, P. Winkler","doi":"10.5445/IR/1000134508","DOIUrl":"https://doi.org/10.5445/IR/1000134508","url":null,"abstract":"The laser-driven generation of relativistic electron beams in plasma and their acceleration to high energies with GV/m-gradients has been successfully demonstrated. Now, it is time to focus on the application of laser-plasma accelerated (LPA) beams. The \"Accelerator Technology HElmholtz iNfrAstructure\" (ATHENA) of the Helmholtz Association fosters innovative particle accelerators and high-power laser technology. As part of the ATHENAe pillar several different applications driven by LPAs are to be developed, such as a compact FEL, medical imaging and the first realization of LPA-beam injection into a storage ring. The latter endeavour is conducted in close collaboration between Deutsches Elektronen-Synchrotron (DESY), Karlsruhe Institute of Technology (KIT) and Helmholtz Institute Jena (HIJ). In the cSTART project at KIT, a compact storage ring optimized for short bunches and suitable to accept LPA-based electron bunches is in preparation. In this conference contribution we will introduce the 50 MeV LPA-based injector and give an overview about the project goals. The key parameters of the plasma injector will be presented. Finally, the current status of the project will be summarized.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89709227","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}

引用次数: 6

An Upgrade Path for the Fermilab Accelerator Complex 费米实验室加速器综合体的升级路径

arXiv: Accelerator Physics Pub Date : 2021-06-03 DOI: 10.2172/1865351

R. Ainsworth, J. Dey, J. Eldred, R. Harnik, J. Jarvis, D. Johnson, I. Kourbanis, D. Neuffer, E. Pozdeyev, M. Syphers, A. Valishev, V. Yakovlev, R. Zwaska

{"title":"An Upgrade Path for the Fermilab Accelerator Complex","authors":"R. Ainsworth, J. Dey, J. Eldred, R. Harnik, J. Jarvis, D. Johnson, I. Kourbanis, D. Neuffer, E. Pozdeyev, M. Syphers, A. Valishev, V. Yakovlev, R. Zwaska","doi":"10.2172/1865351","DOIUrl":"https://doi.org/10.2172/1865351","url":null,"abstract":"The completion of the PIP-II project and its superconducting linear accelerator will provide up to 1.2 MW of beam power to the LBNF/DUNE facility for neutrino physics. It will also be able to produce high-power beams directly from the linac that can be used for lower-energy particle physics experiments as well, such as directing beam toward the Muon Campus at Fermilab for example. Any further significant upgrade of the beam power to DUNE, however, will be impeded by the limitations of the present Booster synchrotron at the facility. To increase the power to DUNE by a factor of two would require a new accelerator arrangement to feed the Main Injector that does not include the Booster. In what follows, a path toward upgrading the Fermilab accelerator complex to bring the beam power for DUNE to 2.4 MW is presented, using a new rapid-cycling synchrotron plus an energy upgrade to the PIP-II linac. The path includes the ability to instigate a new lower-energy, very high-power beam delivery system for experiments that can address much of the science program presented by the Booster Replacement Science Working Group. It also allows for the future possibility to go beyond 2.4 MW up to roughly 4 MW from the Main Injector.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84778019","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}

引用次数: 11

Machine Learning-Based Direct Solver for One-To-Many Problems on Temporal Shaping of Electron Beams 基于机器学习的电子束时间整形一对多问题直接求解器

arXiv: Accelerator Physics Pub Date : 2021-05-18 DOI: 10.21203/RS.3.RS-524222/V1

Jinyu Wan, Y. Jiao, Juhao Wu

引用次数: 2

Adaptive Deep Learning for Time-Varying Systems With Hidden Parameters: Predicting Changing Input Beam Distributions of Compact Particle Accelerators 含隐参数时变系统的自适应深度学习:预测紧凑型粒子加速器输入束分布的变化

arXiv: Accelerator Physics Pub Date : 2021-04-06 DOI: 10.21203/RS.3.RS-373311/V1

A. Scheinker, F. Cropp, S. Paiagua, D. Filippetto

{"title":"Adaptive Deep Learning for Time-Varying Systems With Hidden Parameters: Predicting Changing Input Beam Distributions of Compact Particle Accelerators","authors":"A. Scheinker, F. Cropp, S. Paiagua, D. Filippetto","doi":"10.21203/RS.3.RS-373311/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-373311/V1","url":null,"abstract":"\u0000 Machine learning (ML) tools are able to learn relationships between the inputs and outputs of large complex systems directly from data. However for time-varying systems, the predictive capabilities of ML tools degrade if the systems are no longer accurately represented by the data with which the ML models were trained. For complex systems, re-training is only possible if the changes are slow relative to the rate at which large numbers of new input-output training data can be non-invasively recorded. In this work, we present an approach to deep learning for time-varying systems which does not require re-training. Our approach is to include adaptive feedback in the architecture of deep generative convolutional neural networks (CNN). The feedback is based only on available system output measurements and is applied in the encoded low-dimensional dense layers of the encoder-decoder CNNs. Our approach is inspired by biological systems in which separate groups of neurons interact and are controlled and synchronized by external feedbacks. We demonstrate this approach by developing an inverse model of a complex charged particle accelerator system, mapping output beam measurements to input beam distributions, while both the accelerator components and the unknown input beam distribution vary rapidly with time. We demonstrate our methods on experimental measurements of the input and output beam distributions of the HiRES ultra-fast electron diffraction (UED) beam line at Lawrence Berkeley National Laboratory. Our method can be successfully used to aid both physics and ML-based surrogate online models to provide non-invasive beam diagnostics. We also demonstrate our method for automatically tracking the time varying quantum efficiency map of a particle accelerator’s photocathode.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80995093","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}

引用次数: 3

Comment on “Fast-slow mode coupling instability for coasting beams in the presence of detuning impedance” 对“失谐阻抗存在下滑行梁的快-慢模式耦合不稳定性”的评论

arXiv: Accelerator Physics Pub Date : 2021-04-06 DOI: 10.1103/PhysRevAccelBeams.24.078001

A. Burov, V. Lebedev

引用次数: 2

OPTIMIZATION OF A TRAVELING WAVE SUPERCONDUCTING RADIOFREQUENCY CAVITY FOR UPGRADING THE INTERNATIONAL LINEAR COLLIDER 国际直线对撞机升级用行波超导射频腔的优化设计

arXiv: Accelerator Physics Pub Date : 2021-03-01 DOI: 10.2172/1779488

V. Shemelin, H. Padamsee, V. Yakovlev

{"title":"OPTIMIZATION OF A TRAVELING WAVE SUPERCONDUCTING RADIOFREQUENCY CAVITY FOR UPGRADING THE INTERNATIONAL LINEAR COLLIDER","authors":"V. Shemelin, H. Padamsee, V. Yakovlev","doi":"10.2172/1779488","DOIUrl":"https://doi.org/10.2172/1779488","url":null,"abstract":"The Standing Wave (SW) TESLA niobium-based superconducting radio frequency structure is limited to an accelerating gradient of about 50 MV/m by the critical RF magnetic field. To break through this barrier, we explore the option of niobium-based traveling wave (TW) structures. Optimization of TW structures was done considering experimentally known limiting electric and magnetic fields. It is shown that a TW structure can have an accelerating gradient above 70 MeV/m that is about 1.5 times higher than contemporary standing wave structures with the same critical magnetic field. The other benefit of TW structures shown is R/Q about 2 times higher than TESLA structure that reduces the dynamic heat load by a factor of 2. A method is proposed how to make TW structures multipactor-free. Some design proposals are offered to facilitate fabrication. Further increase of the real-estate gradient (equivalent to 80 MV/m active gradient) is also possible by increasing the length of the accelerating structure because of higher group velocity and cell-to-cell coupling. Realization of this work opens paths to ILC energy upgrades beyond 1 TeV to 3 TeV in competition with CLIC. The paper will discuss corresponding opportunities and challenges.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86634052","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}

引用次数: 2

Accelerator and Beam Physics Research Goals and Opportunities 加速器和束流物理研究的目标和机遇

arXiv: Accelerator Physics Pub Date : 2021-01-11 DOI: 10.2172/1764152

S. Nagaitsev, Z. Huang, J. Power, J. Vay, P. Piot, L. Spentzouris, J. Rosenzweig, Y. Cai, S. Cousineau, M. Conde, M. Hogan, A. Valishev, M. Minty, T. Zolkin, X. Huang, V. Shiltsev, J. Seeman, J. Byrd, Y. Hao, B. Dunham, B. Carlsten, A. Seryi, R. Patterson

引用次数: 13

Optimization and stabilization of a kilohertz laser-plasma accelerator 千赫兹激光等离子体加速器的优化与稳定

arXiv: Accelerator Physics Pub Date : 2020-12-17 DOI: 10.1063/5.0040926

L. Rovige, J. Huijts, I. Andriyash, A. Vernier, M. Ouillé, Z. Cheng, T. Asai, Y. Fukuda, V. Tomkus, V. Girdauskas, G. Račiukaitis, J. Dudutis, V. Stankevič, P. Gečys, R. López-Martens, J. Faure

{"title":"Optimization and stabilization of a kilohertz laser-plasma accelerator","authors":"L. Rovige, J. Huijts, I. Andriyash, A. Vernier, M. Ouillé, Z. Cheng, T. Asai, Y. Fukuda, V. Tomkus, V. Girdauskas, G. Račiukaitis, J. Dudutis, V. Stankevič, P. Gečys, R. López-Martens, J. Faure","doi":"10.1063/5.0040926","DOIUrl":"https://doi.org/10.1063/5.0040926","url":null,"abstract":"Laser plasma acceleration at kilohertz repetition rate has recently been shown to work in two different regimes, with pulse lengths of either 30 fs or 3.5 fs. We now report on a systematic study in which a large range of pulse durations and plasma densities were investigated through continuous tuning of the laser spectral bandwidth. Indeed, two LPA processes can be distinguished, where beams of the highest quality, with 5.4 pC charge and a spectrum peaked at 2-2.5 MeV are obtained with short pulses propagating in moderate plasma densities. Through Particle-in-Cell simulations the two different acceleration processes are thoroughly explained. Finally, we proceed to show the results of a 5-hour continuous and stable run of our LPA accelerator accumulating more than $mathrm{18times10^6}$ consecutive shots, with 2.6 pC charge and peaked 2.5 MeV spectrum. A parametric study of the influence of the laser driver energy through PIC simulations underlines that this unprecedented stability was obtained thanks to micro-scale density gradient injection. Together, these results represent an important step towards stable laser-plasma accelerated electron beams at kilohertz repetition rate.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87328367","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}

引用次数: 11

Optics design of vertical excursion fixed-field alternating gradient accelerators 垂直偏移定场交变梯度加速器的光学设计

arXiv: Accelerator Physics Pub Date : 2020-11-21 DOI: 10.1103/PHYSREVACCELBEAMS.24.021601

S. Machida, D. Kelliher, J. Lagrange, C. Rogers

引用次数: 10

Thresholds for loss of Landau damping in longitudinal plane 纵向平面朗道阻尼损失的阈值

arXiv: Accelerator Physics Pub Date : 2020-11-16 DOI: 10.1103/PHYSREVACCELBEAMS.24.011002

I. Karpov, T. Argyropoulos, E. Shaposhnikova

{"title":"Thresholds for loss of Landau damping in longitudinal plane","authors":"I. Karpov, T. Argyropoulos, E. Shaposhnikova","doi":"10.1103/PHYSREVACCELBEAMS.24.011002","DOIUrl":"https://doi.org/10.1103/PHYSREVACCELBEAMS.24.011002","url":null,"abstract":"Landau damping mechanism plays a crucial role in providing single-bunch stability in LHC, High-Luminosity LHC, other existing as well as previous and future (like FCC) circular hadron accelerators. In this paper, the thresholds for the loss of Landau damping (LLD) in the longitudinal plane are derived analytically using the Lebedev matrix equation (1968) and the concept of the emerged van Kampen modes (1983). We have found that for the commonly-used particle distribution functions from a binomial family, the LLD threshold vanishes in the presence of the constant inductive impedance Im$Z/k$ above transition energy. Thus, the effect of the cutoff frequency or the resonant frequency of a broad-band impedance on beam dynamics is studied in detail. The findings are confirmed by direct numerical solutions of the Lebedev equation as well as using the Oide-Yokoya method (1990). Moreover, the characteristics, which are important for beam operation, as the amplitude of residual oscillations and the damping time after a kick (or injection errors) are considered both above and below the threshold. Dependence of the threshold on particle distribution in the longitudinal phase space is also analyzed, including some special cases with a non-zero threshold for Im$Z/k = const$. All main results are confirmed by macro-particle simulations and consistent with available beam measurements in the LHC.","PeriodicalId":8436,"journal":{"name":"arXiv: Accelerator Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79645716","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}

引用次数: 7