arXiv - PHYS - Accelerator Physics最新文献

{"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}

{"title":"Dynamic Exclusion of Low-Fidelity Data in Bayesian Optimization for Autonomous Beamline Alignment","authors":"Megha R. Narayanan, Thomas W. Morris","doi":"arxiv-2408.06540","DOIUrl":"https://doi.org/arxiv-2408.06540","url":null,"abstract":"Aligning beamlines at synchrotron light sources is a high-dimensional,\u0000expensive-to-sample optimization problem, as beams are focused using a series\u0000of dynamic optical components. Bayesian Optimization is an efficient machine\u0000learning approach to finding global optima of beam quality, but the model can\u0000easily be impaired by faulty data points caused by the beam going off the edge\u0000of the sensor or by background noise. This study, conducted at the National\u0000Synchrotron Light Source II (NSLS-II) facility at Brookhaven National\u0000Laboratory (BNL), is an investigation of methods to identify untrustworthy\u0000readings of beam quality and discourage the optimization model from seeking out\u0000points likely to yield low-fidelity beams. The approaches explored include\u0000dynamic pruning using loss analysis of size and position models and a\u0000lengthscale-based genetic algorithm to determine which points to include in the\u0000model for optimal fit. Each method successfully classified high and low\u0000fidelity points. This research advances BNL's mission to tackle our nation's\u0000energy challenges by providing scientists at all beamlines with access to\u0000higher quality beams, and faster convergence to these optima for their\u0000experiments.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142216296","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}

{"title":"Report on the Advanced Linear Collider Study Group (ALEGRO) Workshop 2024","authors":"J. Vieira, B. Cros, P. Muggli, I. A. Andriyash, O. Apsimon, M. Backhouse, C. Benedetti, S. S. Bulanov, A. Caldwell, Min Chen, V. Cilento, S. Corde, R. D'Arcy, S. Diederichs, E. Ericson, E. Esarey, J. Farmer, L. Fedeli, A. Formenti, B. Foster, M. Garten, C. G. R. Geddes, T. Grismayer, M. J. Hogan, S. Hooker, A. Huebl, S. Jalas, M. Kirchen, R. Lehe, W. Leemans, Boyuan Li, C. A. Lindström, R. Losito, C. E. Mitchell, W. B. Mori, P. Muggli, D. Terzani, M. Thévenet, M. Turner, J. -L. Vay, J. Vieira, D. Völker, Jie Zhang, W. Zhang","doi":"arxiv-2408.03968","DOIUrl":"https://doi.org/arxiv-2408.03968","url":null,"abstract":"The workshop focused on the application of ANAs to particle physics keeping\u0000in mind the ultimate goal of a collider at the energy frontier (10,TeV,\u0000e$^+$/e$^-$, e$^-$/e$^-$, or $gammagamma$). The development of ANAs is\u0000conducted at universities and national laboratories worldwide. The community is\u0000thematically broad and diverse, in particular since lasers suitable for ANA\u0000research (multi-hundred-terawatt peak power, a few tens of femtosecond-long\u0000pulses) and acceleration of electrons to hundreds of mega electron volts to\u0000multi giga electron volts became commercially available. The community spans\u0000several continents (Europe, America, Asia), including more than 62 laboratories\u0000in more than 20 countries. It is among the missions of the ICFA-ANA panel to\u0000feature the amazing progress made with ANAs, to provide international\u0000coordination and to foster international collaborations towards a future HEP\u0000collider. The scope of this edition of the workshop was to discuss the recent\u0000progress and necessary steps towards realizing a linear collider for particle\u0000physics based on novel-accelerator technologies (laser or beam driven in plasma\u0000or structures). Updates on the relevant aspects of the European Strategy for\u0000Particle Physics (ESPP) Roadmap Process as well as of the P5 (in the US) were\u0000presented, and ample time was dedicated to discussions. The major outcome of\u0000the workshop is the decision for ALEGRO to coordinate efforts in Europe, in the\u0000US, and in Asia towards a pre-CDR for an ANA-based, 10,TeV CM collider. This\u0000goal of this coordination is to lead to a funding proposal to be submitted to\u0000both EU and EU/US funding agencies. This document presents a summary of the\u0000workshop, as seen by the co-chairs, as well as short 'one-pagers' written by\u0000the presenters at the workshop.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141934510","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}

{"title":"Simulation studies on compensation for space-charge-induced half-integer and 3rd-order resonance crossing in HIAF-BRing","authors":"Cheng Guo, Jie Liu, Jiancheng Yang, Ruihu Zhu","doi":"arxiv-2408.01954","DOIUrl":"https://doi.org/arxiv-2408.01954","url":null,"abstract":"Space-charge-induced resonance crossing is one notable limitation of beam\u0000intensity in high-intensity synchrotrons. This paper proposes a modification to\u0000the Resonance Driving Terms (RDTs) to compensate for the combined effects of\u0000space charge and magnetic field imperfections under resonance crossing. The new\u0000RDTs are named modified RDTs. The effectiveness of the modified RDTs is\u0000demonstrated through simulations of half-integer and 3rd-order resonance\u0000crossings using the lattice of the High Intensity Heavy-Ion Accelerator\u0000Facility Booster Ring (HIAF-BRing). The simulations illustrate that the\u0000compensation provided by the modified RDTs significantly suppresses emittance\u0000growth and reduces distortion in the phase space.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141934514","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}

{"title":"Magnetic Compressors for MeV-UED","authors":"Tianzhe Xu, Robert Joel England","doi":"arxiv-2408.00936","DOIUrl":"https://doi.org/arxiv-2408.00936","url":null,"abstract":"Magnetic compressors offer an attractive path toward jitter-free bunch\u0000compression in MeV-UED. Compared with RF bunchers, magnetic compressors do not\u0000introduce additional timing jitter and can be configured to minimize timing\u0000jitter due to upstream energy fluctuation. In this work we discuss the\u0000principles of designing magnetic compressors for MeV-UED. Start-to-end\u0000simulation of a dogleg compressor is presented. Results show a bunch length of\u000011~fs can be achieved at 100 fC charge with small emittance growth.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141934511","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}

{"title":"Calculation of RF-induced Temporal Jitter in Ultrafast Electron Diffraction","authors":"Tianzhe Xu, Fuhao Ji, Stephen Weathersby, Robert Joel England","doi":"arxiv-2408.00937","DOIUrl":"https://doi.org/arxiv-2408.00937","url":null,"abstract":"A significant contribution to the temporal resolution of an ultrafast\u0000electron diffraction (UED) instrument is arrival time jitter caused by\u0000amplitude and phase variation of radio frequency (RF) cavities. In this paper,\u0000we present a semi-analytical approach for calculating RF-induced temporal\u0000jitter from klystron and RF cavity parameters. Our approach allows fast\u0000estimation of temporal jitter for MeV-UED beamlines and can serve as a virtual\u0000timing tool when shot-to-shot measurements of RF amplitude and phase jitters\u0000are available. A simulation study for the SLAC MeV-UED instrument is presented\u0000and the temporal resolution for several beamline configurations are compared.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141934471","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}

{"title":"Epics Deployment at Fermilab","authors":"P. HanletFermi National Accelerator Laboratory, M. GonzalezFermi National Accelerator Laboratory, J. DiamondFermi National Accelerator Laboratory, K. S. MartinFermi National Accelerator Laboratory","doi":"arxiv-2408.00174","DOIUrl":"https://doi.org/arxiv-2408.00174","url":null,"abstract":"Fermilab has traditionally not been an EPICS house; as such expertise in\u0000EPICS is limited and scattered. PIP-II will be using EPICS for its control\u0000system. When in operation, it will need to interface with the existing,\u0000modernized (see ACORN) legacy control system. Treating EPICS controls at\u0000Fermilab as a green field, we have developed and deployed a software pipeline\u0000which addresses these needs and presents to developers a tested and robust\u0000software framework, including template IOCs from which new developers can\u0000quickly deploy new front ends, aka IOCs. In this presentation, motivation for\u0000this work, implementation of a continuous integration/continuous deployment\u0000pipeline, testing, template IOCs, and the deployment of user\u0000services/applications will be discussed. This new infrastructure of IOCs and\u0000services is being developed and used in the PIP-II cryomodule teststand; our\u0000experiences and lessons learned will be also be discussed.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"235 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141884718","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}

{"title":"Low-alpha Operation of the Iota Storage Ring","authors":"M. WallbankFermi National Accelerator Laboratory, Batavia, IL, USA, J. JarvisFermi National Accelerator Laboratory, Batavia, IL, USA","doi":"arxiv-2407.20358","DOIUrl":"https://doi.org/arxiv-2407.20358","url":null,"abstract":"Operation with ultra-low momentum-compaction factor (alpha) is a desirable\u0000capability for many storage rings and synchrotron radiation sources. For\u0000example, low-alpha lattices are commonly used to produce picosecond bunches for\u0000the generation of coherent THz radiation and are the basis of a number of\u0000conceptual designs for EUV generation via steady-state microbunching (SSMB).\u0000Achieving ultra-low alpha requires not only a high-level of stability in the\u0000linear optics but also flexible control of higher-order compaction terms.\u0000Operation with lower momentum-compaction lattices has recently been\u0000investigated at the IOTA storage ring at Fermilab. A procedure for lowering the\u0000ring compaction using the linear optics along with compensations from the\u0000higher-order magnets was developed with the aid of a model, and an experimental\u0000technique for measuring the momentum compaction was developed. The lowest\u0000momentum compaction achieved during the available run-time was\u0000$3.4times10^{-4}$, around 15 times lower than previously operated. These\u0000feasibility studies ensure an improved experimental understanding of the IOTA\u0000optics and potentially will enable new research programs at the facility.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"87 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865241","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}

{"title":"Hall Effect, Magnetoresistance, and Current Distribution in Quench Heaters","authors":"J. Rysti","doi":"arxiv-2407.19830","DOIUrl":"https://doi.org/arxiv-2407.19830","url":null,"abstract":"Quench heaters are often an essential part of protecting a superconducting\u0000accelerator magnet during a quench. Their purpose is to spread the quench\u0000throughout the coil as quickly as possible. They are located in areas of high\u0000magnetic fields and are thus prone to magnetoresistive phenomena and the Hall\u0000effect. Such influences can cause currents to distribute unevenly in the\u0000heaters, which results in uneven heating. This can reduce the effectiveness of\u0000the heaters and even endanger them due to excessive local heating. Also, the\u0000heater geometry itself can be the cause of uneven current density. In this paper we investigate by numerical simulations the importance of the\u0000magnetic effects on quench heater performance and whether they should be taken\u0000into account in the design. The main interest is in the Hall effect, which was\u0000perceived as the most likely source of trouble for the design of quench\u0000heaters. We use a simple phenomenological approach for modeling the Hall\u0000effect, utilizing values from the literature for the Hall coefficients.\u0000Magnetoresistance is also considered and the impact of heater geometry on\u0000current distributions is briefly visited. The conclusion of this research is that magnetoresistance plays an\u0000insignificant role in the functioning of quench heaters. The Hall effect can\u0000clearly be more influential, but nevertheless should not pose any problems in\u0000most cases. Current distributions due to heater geometry should be take into\u0000consideration in the design phase and, if needed, take measures to equalize the\u0000current density by using, for example, copper cladding in appropriate\u0000locations.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872895","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}

{"title":"Target Development Using the Method of High-Intensity Vibrational Powder Plating (HIVIPP) at the Center for Accelerator Target Science (CATS) at Argonne National Laboratory (ANL)","authors":"C. Mohs, C. Müller-Gatermann, M. Gott, J. Nolen, R. Gampa, J. Greene","doi":"arxiv-2407.19052","DOIUrl":"https://doi.org/arxiv-2407.19052","url":null,"abstract":"One of the primary goals of the Center for Accelerator Target Science (CATS)\u0000is to provide targets and foils in support of the ATLAS User Facility and the\u0000Low-Energy community at large. While a wide array of target production\u0000techniques are available at CATS, new methods that must be explored invariably\u0000arise. One such technique, the High-Intensity Vibrational Powder Plating\u0000(HIVIPP), was first reported in 1997 by Isao Sugai. It was developed to produce\u0000targets and stripper foils that were difficult to make by standard methods. At\u0000Argonne National Laboratory (ANL), we have successfully constructed and tested\u0000a simple system for this purpose. We have produced targets of carbon and\u0000titanium on various metal backings using the HIVIPP method. We are currently in\u0000the exciting phase of exploring the production of other elements, including\u0000isotopically enriched and radioactive material. This work is in progress and\u0000will be further detailed with specific examples.","PeriodicalId":501318,"journal":{"name":"arXiv - PHYS - Accelerator Physics","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865242","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}