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PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)最新文献

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Survey of recent results on electron cloud effects in photon machines 光子机中电子云效应的最新研究成果综述
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-10 DOI: 10.1109/PAC.2001.987601
K. Harkay, R. Rosenberg, Z. Guo, Q. Qin
{"title":"Survey of recent results on electron cloud effects in photon machines","authors":"K. Harkay, R. Rosenberg, Z. Guo, Q. Qin","doi":"10.1109/PAC.2001.987601","DOIUrl":"https://doi.org/10.1109/PAC.2001.987601","url":null,"abstract":"Electron cloud interactions with high-energy beams are believed,. responsible, for various undesirable effects ranging from vacuum degradation to collective beam instabilities. An important source of uncertainty in predicting electron cloud effects for a given machine lies in understanding in detail the processes relating to the generation of the cloud. The Advanced Photon Source (APS) has taken a lead role in the development of techniques for and the interpretation of direct measurements of the electron cloud distribution. Through such data, good progress has been made in placing realistic limits on critical input parameters in computer models relating to cloud production for actual accelerator chamber surfaces and geometries. Specially constructed electron detectors, using designs based on those first implemented at the APS storage ring, have been installed or are planned at a number of electron, positron, and proton rings to directly measure the properties of the electron cloud. Highlights will be presented of recent results from the APS, and a comparison is made between measurements at the APS and recent results at the Beijing Electron Positron Collider. These results illuminate machine conditions in which secondary processes become important.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116951228","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: 5
Strategy for achieving true sub-micron orbit stabilization at the Advanced Photon Source 在先进光子源上实现真正亚微米轨道稳定的策略
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-10 DOI: 10.1109/PAC.2001.987522
G. Decker, O. Singh
{"title":"Strategy for achieving true sub-micron orbit stabilization at the Advanced Photon Source","authors":"G. Decker, O. Singh","doi":"10.1109/PAC.2001.987522","DOIUrl":"https://doi.org/10.1109/PAC.2001.987522","url":null,"abstract":"The Advanced Photon Source was commissioned in March 1995 to provide high-brightness ultrastable X-ray photon beams to its user community. The original beam stability specifications were that the source points not move more than 4.5 microns RMS vertically and 17 microns RMS horizontally. Reductions in coupling, together with planned reductions in emittance and increasing beamline user sophistication, are pushing the envelope of presently achievable beam stabilization methods. While beam stability below the 2-micron RMS level is achieved routinely in the band from 0.016 Hz to 30 Hz in both the vertical and horizontal planes, much remains to be done to reduce this level below 1 micron RMS. An additional challenge is to maintain the beam stability for longer time periods, i.e., days to weeks. This paper discusses progress to date on these issues and suggests methodologies for further improvements.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127503043","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
Analysis of coherent optical transition radiation interference patterns produced by SASE-induced microbunches sase诱导微束产生的相干光跃迁辐射干涉图分析
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-09 DOI: 10.1109/PAC.2001.986656
D. Rule, A. Lumpkin
{"title":"Analysis of coherent optical transition radiation interference patterns produced by SASE-induced microbunches","authors":"D. Rule, A. Lumpkin","doi":"10.1109/PAC.2001.986656","DOIUrl":"https://doi.org/10.1109/PAC.2001.986656","url":null,"abstract":"We present an analysis of data published recently on coherent optical transition radiation interferometry (COTRI) angular distributions made on the Argonne experiment on microbunching. These COTRI distributions exhibited some intriguing characteristics: highly enhanced lobe patterns in the /spl plusmn//spl theta//sub y/ direction, instead of circularly symmetric fringes; and asymmetries in intensities in +/spl theta//sub y/ vs. -/spl theta//sub y/ in some cases. We have done calculations that produce patterns consistent with those observed. The role of the microbunch's elliptical transverse beam profile in accounting for the /spl theta//sub x/-/spl theta//sub y/ asymmetry is illustrated. Similarly, a beam profile with a /spl plusmn/y asymmetry gives a lobe asymmetry in +/spl theta//sub y/ vs. -/spl theta//sub y/. The interplay of the interference fringe pattern and the microbunch's transverse form factor accounts for the angular positions of the lobes. The fringe visibility was calculated by convolving the beam divergence distribution with the COTRI pattern. Thus, we have shown that COTRI angular patterns can be used to characterize the effective transverse size, microbunch length, divergence, and the bunching fraction.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"460 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122162641","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
The high-power s-band feed subsystem for the Advanced Photon Source injector test stand 先进光子源喷射器试验台的大功率s波段馈电子系统
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-09 DOI: 10.1109/PAC.2001.986691
A. Grelick, S. Berg, G. Goeppner, J. Lewellen, S. Milton, A. Nassiri, G. Pile, T. Smith
{"title":"The high-power s-band feed subsystem for the Advanced Photon Source injector test stand","authors":"A. Grelick, S. Berg, G. Goeppner, J. Lewellen, S. Milton, A. Nassiri, G. Pile, T. Smith","doi":"10.1109/PAC.2001.986691","DOIUrl":"https://doi.org/10.1109/PAC.2001.986691","url":null,"abstract":"The RF subsystem for the Advanced Photon Source injector test stand is a totally passive system. The waveguide variable power dividers and phase shifters, which are pressurized with SF/sub 6/, are used to provide three high-power ports that are independently adjustable in phase and amplitude while maintaining negligible differential phase jitter. Either three independent devices or a device requiring three inputs can be tested at any one time.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130011603","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: 5
A prototype 7.5 MHz Finemet(R) loaded RF cavity and 200kW amplifier for the Fermilab Proton Driver 用于费米实验室质子驱动器的7.5 MHz精微(R)负载射频腔和200kW放大器的原型
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-09 DOI: 10.1109/PAC.2001.986510
J. Dey, I. Kourbanis, Z. Qian, D. Wildman
{"title":"A prototype 7.5 MHz Finemet(R) loaded RF cavity and 200kW amplifier for the Fermilab Proton Driver","authors":"J. Dey, I. Kourbanis, Z. Qian, D. Wildman","doi":"10.1109/PAC.2001.986510","DOIUrl":"https://doi.org/10.1109/PAC.2001.986510","url":null,"abstract":"A 7.5 MHz RF cavity and power amplifier have been built and tested at Fermilab as part of the proton Driver Design Study. The project goal was to achieve the highest possible 7.5 MHz accelerating gradient at 15 Hz with a 50% duty cycle. To reduce beam loading effects, a low shunt impedance (500/spl Omega/) design was chosen. The 46cm long single gap cavity uses 5 inductive cores, consisting of the nanocrystalline soft magnetic alloy Finemet, to achieve a peak accelerating voltage of 15 kV. The 95cm OD tape wound cores have been cut in half to increase the cavity Q and are cooled from both sides using large water-cooled copper heat sinks. The prototype cavity has a shunt impedance of 550/spl Omega/, Q=11, and is powered by a 200kW cw cathode driven tetrode amplifier. Both cavity and amplifier designs are described. Results from recent cavity tests coalescing beam in the Fermilab Main Injector are also presented.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129648559","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
Design and measurements of a deflecting mode cavity for an RF separator 射频分离器偏转模腔的设计与测量
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-09 DOI: 10.1109/PAC.2001.986583
L. Bellantoni, H. Edwards, M. Mcashan, Il Batavia, R. wanzenberg
{"title":"Design and measurements of a deflecting mode cavity for an RF separator","authors":"L. Bellantoni, H. Edwards, M. Mcashan, Il Batavia, R. wanzenberg","doi":"10.1109/PAC.2001.986583","DOIUrl":"https://doi.org/10.1109/PAC.2001.986583","url":null,"abstract":"The Fermilab Main Injector can produce intense 120 GeV/c proton beams for fixed target experimentation. Two deflecting mode RF systems can be used to separate charged kaons from a momentum selected secondary beam, consisting of pions, kaons and protons, using a time of flight method. We present the RF design of a 3.9 GHz superconducting cavity which operates in the deflecting (TM110) pi-mode and the dependence of the RF parameters on the cavity shape, as determined with finite difference calculations. End cell compensation has been treated, providing cell-to-cell field flatness. First results from measurements on a prototype cavity are shown. We demonstrated that it is possible to tune the deflecting mode of a five cell cavity with bead pull measurements. Effects relating to the polarization of the modes are discussed.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"128 15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132804297","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: 12
Interactive orbit control in MATLAB MATLAB中的交互式轨道控制
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-06 DOI: 10.1109/PAC.2001.986484
J. Corbett, A. Terebilo
{"title":"Interactive orbit control in MATLAB","authors":"J. Corbett, A. Terebilo","doi":"10.1109/PAC.2001.986484","DOIUrl":"https://doi.org/10.1109/PAC.2001.986484","url":null,"abstract":"Recent advances in steering algorithms have made it possible to accurately control electron beam position in storage rings, implement fast and slow feedback systems, and in some cases detect hardware errors. In practice, however, the program operator would like to reduce the overhead of selecting variables and constraints and to easily view the data. To simplify the process, we constructed an interactive orbit control program in MATLAB. The program modules are easily adapted to new algorithms or beam lines. This paper describes the program functionality and architecture.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132900309","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: 4
Measurements of the SPS transverse impedance in 2000 2000年SPS横向阻抗测量
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-03 DOI: 10.1109/PAC.2001.987274
G. Arduini, H. Burkhardt, K. Cornelis, J. Klem, F. Zimmermann, M. Zorzano
{"title":"Measurements of the SPS transverse impedance in 2000","authors":"G. Arduini, H. Burkhardt, K. Cornelis, J. Klem, F. Zimmermann, M. Zorzano","doi":"10.1109/PAC.2001.987274","DOIUrl":"https://doi.org/10.1109/PAC.2001.987274","url":null,"abstract":"We report on measurements of coherent tune shifts, head-tail growth rates, and current-dependent betatron phase advances at the CERN SPS in the year 2000. Comparing results obtained at two different energies shows that there is no notable contribution from space charge. Within the measurement resolution the impedance is the same as in 1999, consistent with the expected small effect from changes to only a small number of pumping ports. In 2000, data were taken over an expanded range of chromaticities, which increases the sensitivity to the impedance frequency distribution. Measurements of the current-dependent phase advance around the ring help localizing the most important impedance sources.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126328377","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
Engineering, design and prototype tests of a 3.9 GHz transverse-mode superconducting cavity for a radiofrequency-separated Kaon beam 用于射频分离Kaon束流的3.9 GHz横模超导腔的工程、设计和原型测试
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-03 DOI: 10.1109/PAC.2001.986505
M. Champion, L. Bellantoni, T. Berenc, C. Deibele, H. Edwards, M. Foley, J. Fuerst, M. Kuchnir, A. Rowe
{"title":"Engineering, design and prototype tests of a 3.9 GHz transverse-mode superconducting cavity for a radiofrequency-separated Kaon beam","authors":"M. Champion, L. Bellantoni, T. Berenc, C. Deibele, H. Edwards, M. Foley, J. Fuerst, M. Kuchnir, A. Rowe","doi":"10.1109/PAC.2001.986505","DOIUrl":"https://doi.org/10.1109/PAC.2001.986505","url":null,"abstract":"A research and development program is underway to construct superconducting cavities to be used for radiofrequency separation of a kaon beam at Fermilab. The design calls for installation of twelve 13-cell cavities operating in the 3.9 GHz transverse mode with a deflection gradient of 5 MV/m. We present the mechanical, cryogenic and vacuum design of the cavity, cryomodule, rf power coupler, cold tuner and supporting hardware. The electromagnetic design of the cavity is presented in a companion paper by Wanzenberg and McAshan (2001). The warm tuning system (for field flatness) and the vertical test system will be presented along with test results of bench measurements and cold tests on single-cell and five-cell prototypes.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120965174","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
The electron cloud instability: summary of measurements and understanding 电子云不稳定性:测量和理解的总结
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-03 DOI: 10.1109/PAC.2001.987600
F. Zimmermann
{"title":"The electron cloud instability: summary of measurements and understanding","authors":"F. Zimmermann","doi":"10.1109/PAC.2001.987600","DOIUrl":"https://doi.org/10.1109/PAC.2001.987600","url":null,"abstract":"Electron-cloud effects presently limit the performance of several accelerators operating with high beam current, notably the SLAC and KEK B factories, the CERN SPS, the CERN PS, and the Los Alamos PSR. They are a major concern for many future projects, e.g., the CERN LHC and the SNS. An electron cloud is generated in the vacuum chamber by photoemission or beam-induced multipacting and subsequent electron accumulation during a bunch or bunch-train passage. Both coupled and single bunch instabilities, pressure rise, malfunctioning of beam diagnostics and failures of multi-bunch feedback systems have all been attributed to the cloud electrons. We compare observations from various laboratories with computer simulations and analytical estimates, and we address mechanisms by which the electrons may dilute the beam emittance. Possible cures and future research directions are also discussed.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133834061","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: 25
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