Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)最新文献

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Polarized electrons in the AmPS storage ring AmPS存储环中的极化电子
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.749929
G. Liujckx, P. W. van Amersfoort, H. Boer-Rookhuizen, J. van den Brand, F. Kroes, C. D. de Jager, L. Kuijer, J. van der Laan, R. Maas, J. Noomen, I. Passchier, M. van den Putte, I. Koop, B. Militsyn
{"title":"Polarized electrons in the AmPS storage ring","authors":"G. Liujckx, P. W. van Amersfoort, H. Boer-Rookhuizen, J. van den Brand, F. Kroes, C. D. de Jager, L. Kuijer, J. van der Laan, R. Maas, J. Noomen, I. Passchier, M. van den Putte, I. Koop, B. Militsyn","doi":"10.1109/PAC.1997.749929","DOIUrl":"https://doi.org/10.1109/PAC.1997.749929","url":null,"abstract":"AmPS is a 300-900 MeV electron ring. The machine was designed as a pulse stretcher to provide continuous external beams. After years of successful operation in this mode the nuclear physics program now concentrates on experiments with stored beams interacting with internal gas targets. These experiments require currents between 50 and 200 mA through 60 cm long 15 mm wide cylindrical target cells. Gas pressures in the open-ended cells correspond to target thickness of 10/sup 14/ to 10/sup 16/ atoms/cm/sup 2/. Strong stray fields from a spectrometer and from target holding fields disturb the closed orbit. Under operational conditions the linac provides a maximum energy of 700 MeV, so ramping is required to achieve 900 MeV. To further increase the luminosity at the target a reduced emittance lattice based on the existing magnet configuration has been designed. Late 1996 a polarized electron injector as well as a \"Siberian Snake\" to control the spin on the internal target became operational. The polarized injector delivers a few mA to the linac so stacked injection in the ring is required. With strained InGaAsP cathodes a polarization of 80% was obtained. Test results, performance and prospects are presented.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"324 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116821867","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: 1
7 GHz pulsed magnicon: study and new results 7 GHz脉冲磁振子:研究与新成果
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.753126
E. Kozyrev, I. Makarov, O. Nezhevenko, A. Nikiforov, G. Ostreiko, B. Z. Persov, G.V. Serodbintsev, S. V. Shchelkunoff, V. Tarnetsky, V. Yakovlev, I. Zapryagaev
{"title":"7 GHz pulsed magnicon: study and new results","authors":"E. Kozyrev, I. Makarov, O. Nezhevenko, A. Nikiforov, G. Ostreiko, B. Z. Persov, G.V. Serodbintsev, S. V. Shchelkunoff, V. Tarnetsky, V. Yakovlev, I. Zapryagaev","doi":"10.1109/PAC.1997.753126","DOIUrl":"https://doi.org/10.1109/PAC.1997.753126","url":null,"abstract":"The report presents new experimental results obtained on 7 GHz pulsed magnicon amplifier. In 1996, the following parameters were achieved: maximum output power of 46 MW, efficiency of 49%. We relate the further magnicon parameters improving with elimination of electromagnetic fields disturbing in the output cavity induced by the large coupling of holes with the loads.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117128328","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: 1
Performance of the spiral line induction accelerator 螺旋线感应加速器的性能
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.749990
J.R. Smith, V. Bailey, H. Lackner, S. Putnam
{"title":"Performance of the spiral line induction accelerator","authors":"J.R. Smith, V. Bailey, H. Lackner, S. Putnam","doi":"10.1109/PAC.1997.749990","DOIUrl":"https://doi.org/10.1109/PAC.1997.749990","url":null,"abstract":"A proof-of-concept experiment (POCE) to demonstrate the performance of a novel recirculating induction accelerator has been completed. The Spiral Line Induction Accelerator employs a unique combination of features (spiral beamline, shielded off-axis gaps, and stellarator focussing fields) which permits efficient, high-current operation with a compact device. Initial experiments demonstrated acceleration of 2 and 10 kA beams to 5.5 MeV and acceleration of a 12.5 kA beam to 4.5 MeV by transport around a full turn with two passes through a single accelerating unit. Recent tests with the completed POCE hardware achieved the program goal with acceleration of a 2.4 kA beam to 9.5 MeV.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129808066","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: 8
Design of a high average power waveguide window 高平均功率波导窗口的设计
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.753147
E. Chojnacki, T. Hays, J. Kirchgessner, H. Padamsee, M. Cole, T. Schultheiss
{"title":"Design of a high average power waveguide window","authors":"E. Chojnacki, T. Hays, J. Kirchgessner, H. Padamsee, M. Cole, T. Schultheiss","doi":"10.1109/PAC.1997.753147","DOIUrl":"https://doi.org/10.1109/PAC.1997.753147","url":null,"abstract":"A study has been performed to design a waveguide vacuum window capable of propagating >1 MW average power operating at 500 MHz. This would extend current technology by about a factor of 2 in average power for stand-alone windows, made possible by advances in available ceramic size and quality. The work to be presented comprises the RF design and corresponding thermo-mechanical analysis.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129866257","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: 15
Parameter and cost model for spallation neutron source studies 散裂中子源研究的参数和代价模型
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.753437
J. Galambos, D.K. Osen
{"title":"Parameter and cost model for spallation neutron source studies","authors":"J. Galambos, D.K. Osen","doi":"10.1109/PAC.1997.753437","DOIUrl":"https://doi.org/10.1109/PAC.1997.753437","url":null,"abstract":"A Spallation Neutron Source Systems Model has been developed to facilitate parameter and cost studies of accelerator-based spallation neutron source (SNS) systems. This model includes modules for all pertinent components and processes, such as accelerators and rings, target (neutron source), experimental facilities, conventional facilities, construction costs, preoperational costs, etc. Present accelerator modules include room temperature linacs, accumulator rings (AR) and rapid cycling synchrotrons (RCS). All the modules in the model are linked together via an optimizer to facilitate overall trade studies. The model has been developed for and used by the National Spallation Neutron Source (NSNS) project to be built in Oak Ridge.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129869173","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
PEP-II bunch-by-bunch current monitor PEP-II串电流监测器
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.751167
M. Chin, J. Hinkson
{"title":"PEP-II bunch-by-bunch current monitor","authors":"M. Chin, J. Hinkson","doi":"10.1109/PAC.1997.751167","DOIUrl":"https://doi.org/10.1109/PAC.1997.751167","url":null,"abstract":"PEP-II is an asymmetric B-Factory that will have 2200 meter rings storing 9 GeV electrons and 3.1 GeV positrons, each with as many as 3492 beam bunches. To minimize beam-beam instabilities it is important to have equal bunch charge in each ring. This is accomplished by measuring the relative bunch charge and controlling injection timing and intensity. Because there may be a variety of bunch patterns, the bunch monitors are designed to measure beam in every possible bucket. Results of bunch amplitude measurements with resolution of >9 bits are available to the injection control system at rates up to 66 Hz. The bunch monitor hardware consists of beam pickups, front end filter/combiners, 1428 MHz down-converters, 1 GHz video detectors, and two VXI systems. In this paper we report on the bunch monitor design.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128429177","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
Local chromaticity correction of the LHC LHC的局部色度校正
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.749563
C. Johnstone
{"title":"Local chromaticity correction of the LHC","authors":"C. Johnstone","doi":"10.1109/PAC.1997.749563","DOIUrl":"https://doi.org/10.1109/PAC.1997.749563","url":null,"abstract":"Local chromaticity correction of a low-beta region can under certain conditions enhance the momentum acceptance of a circular accelerator. For this paper a local chromaticity scheme was explored for the LHC employing chromatic correction sextupoles in the arc cells nearest the final-focus triplet. Initially, existing optics and current sextupole locations were used to correct the natural chromaticity of the LHC Interaction Region (IR) and preliminary tracking indicated an increase in dynamic aperture. However, calculated sextupole strengths were unrealistic. Therefore, work on a specialized chromatic correction region with increased beta functions at specific sextupole locations has begun. The higher beta functions allow the strengths required for the sextupoles to be reduced and, also, more optimal sextupole phase advances for chromatic correction. Progress towards an optical model for local chromatic correction for the LHC IR is the subject of this paper.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128794940","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
Summary of the single-beam collective effects in the LHC 大型强子对撞机的单束集体效应综述
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.749559
F. Ruggiero, J. S. Berg, Oliver S. Bruning, Fritz Caspers, M. Morvillo, M. D'yachkov
{"title":"Summary of the single-beam collective effects in the LHC","authors":"F. Ruggiero, J. S. Berg, Oliver S. Bruning, Fritz Caspers, M. Morvillo, M. D'yachkov","doi":"10.1109/PAC.1997.749559","DOIUrl":"https://doi.org/10.1109/PAC.1997.749559","url":null,"abstract":"Single beam collective effects can limit the performance of the LHC and, together with parasitic losses, impose constraints on the design of the components of the LHC vacuum system. Because of the large number of bunches in the LHC, coherent losses and multibunch instability rise times generated by the impedance items can be rather large. For example, the vacuum chambers of the main experiments can lead to large parasitic losses and a continuous feedback from the impedance calculations during their design process is desirable. We first summarise the current status of the impedance model for the LHC and estimate rise times and threshold currents for different instabilities. In a second step, we discuss possibilities of controlling these instabilities, using feedback systems and Landau damping.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128705467","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
Possibility of X-ray free electron laser with single crystal optical resonator for Bragg reflection 单晶光学谐振腔x射线自由电子激光器用于布拉格反射的可能性
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.749872
Y. Miyahara
{"title":"Possibility of X-ray free electron laser with single crystal optical resonator for Bragg reflection","authors":"Y. Miyahara","doi":"10.1109/PAC.1997.749872","DOIUrl":"https://doi.org/10.1109/PAC.1997.749872","url":null,"abstract":"Noting the X-ray reflection coefficient of a single crystal as high as 90% at a Bragg angle, a possibility of X-ray free electron laser in a storage ring was investigated. An optical resonator composed of four Si single crystal mirrors with diffraction angle 45 degrees provides a light beam size in the optical resonator about 30 /spl mu/m rms at a wavelength of 0.217 nm. Assuming an electron beam emittance of 46 pm-rad at a beam energy of 3 GeV, and a peak current of 1200 A, we obtain an FEL gain of 39% for an undulator with a number of periods of 300, which is slightly higher than the radiation loss in the mirrors. At the same time a conceptual design of a storage ring with such a small emittance beam is presented.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128706852","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: 0
Device for the electron bunch length measurement of 1-5 mm RMS 电子束长度测量装置有效值为1-5毫米
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.751089
V. Kaljuzhny, D. Kostin, N. Sobenin, S. N. Yarigin, A. Zavadtsev, M. Dohlus, N. Holtkamp
{"title":"Device for the electron bunch length measurement of 1-5 mm RMS","authors":"V. Kaljuzhny, D. Kostin, N. Sobenin, S. N. Yarigin, A. Zavadtsev, M. Dohlus, N. Holtkamp","doi":"10.1109/PAC.1997.751089","DOIUrl":"https://doi.org/10.1109/PAC.1997.751089","url":null,"abstract":"Two variants of bunch length monitor (BLM) for the measurement of 1-5 mm RMS bunch length (/spl sigma//sub z/) are offered. The first one was designed for the measurement of a single bunch RMS. It consists of two cavities, each of them operates at two modes, E/sub 010/ and E/sub 110/. The second variant of BLM was designed for the measurement of a RMS of the bunches with repetition period less then 16 ns (series of identical bunches). There are two cavities in the BLM too. Loop coupling is used for the cavities and cavity-filters.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124756786","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
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