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Overview of collimation in the Next Linear Collider 下一个线性碰撞器的准直概述
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-27 DOI: 10.1109/PAC.2001.988271
P. Tenenbaum, P. Emma, L. Keller, Y. Nosochkov, T. Raubenheimer, M. Woodley
{"title":"Overview of collimation in the Next Linear Collider","authors":"P. Tenenbaum, P. Emma, L. Keller, Y. Nosochkov, T. Raubenheimer, M. Woodley","doi":"10.1109/PAC.2001.988271","DOIUrl":"https://doi.org/10.1109/PAC.2001.988271","url":null,"abstract":"The Next Linear Collider (NLC) requires a substantial system of beam collimators to minimize the halo-related backgrounds at the interaction point, provide machine protection against errant pulses, and limit radiation doses throughout the accelerator. In particular, the NLC design contains a complete 5-dimensional (x,x',y,y',energy) collimation system at the entrance and exit of the main linac; transverse collimators at the electron and positron sources, at the 250 MeV point in the injector linac, and immediately upstream of the damping rings; a series of collimators at points with substantial z-energy correlation for longitudinal collimation; and a final set of transverse and energy collimators in the final focus, a few hundred meters from the IP. We describe the systems above and estimate the intensity of the halo at each point, as well as the efficiency with which the halo is removed by the collimators.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127353941","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
The CLIC study of magnet stability and time-dependent luminosity performance 磁体稳定性和随时间变化的发光性能的CLIC研究
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-26 DOI: 10.1109/PAC.2001.988249
M. Aleksa, R. Assmann, W. Coosemans, G. Guignard, N. Leros, M. Mayoud, S. Redaelli, F. Ruggiero, S. Russenschuck, D. Schulte, I. Wilson, F. Zimmermann
{"title":"The CLIC study of magnet stability and time-dependent luminosity performance","authors":"M. Aleksa, R. Assmann, W. Coosemans, G. Guignard, N. Leros, M. Mayoud, S. Redaelli, F. Ruggiero, S. Russenschuck, D. Schulte, I. Wilson, F. Zimmermann","doi":"10.1109/PAC.2001.988249","DOIUrl":"https://doi.org/10.1109/PAC.2001.988249","url":null,"abstract":"The present parameters of the CLIC study require the collision of small emittance beams with a vertical spot size of 1 nm. The tolerances on vertical quadrupole vibration (above a few Hz) are as small as a few nm in the linac and most of the Final Focus. The final focusing quadrupole has a stability requirement of 4 nm in the horizontal and 0.2 nm in the vertical direction. Those tolerances can only be achieved with the use of damped support structures for CLIC. A study has been set-up at CERN to explore the application of stabilization devices from specialized industry and to predict the time-dependent luminosity performance for CLIC. The results will guide the specification of required technological improvements and will help to verify the feasibility of the present CLIC parameters.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122842748","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: 9
A fast injection kicker magnet for the Tevatron 一个用于Tevatron的快速注入磁铁
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-25 DOI: 10.1109/PAC.2001.988231
C. Jensen, B. Hanna, Fermilab R. Reilly
{"title":"A fast injection kicker magnet for the Tevatron","authors":"C. Jensen, B. Hanna, Fermilab R. Reilly","doi":"10.1109/PAC.2001.988231","DOIUrl":"https://doi.org/10.1109/PAC.2001.988231","url":null,"abstract":"A new proton injection kicker system is required for the Tevatron in the Run II era. The new system was designed to supply 1.25 kG-m into a magnetic aperture of 48 mm vertical /spl times/ 71 mm horizontal /spl times/ 5 m long with a 396 ns bunch spacing. The system is configured to be upgraded to a bunch spacing of 132 ns with additional pulsed power supplies. The design of the magnet incorporated some novel features in order to meet these requirements. These include adjustable bus spacing to set the inductance, balanced positive and negative high voltage buses and an integrated capacitive pickup. This system has been installed in the Tevatron since July 2000.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116853799","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
Fermilab Electron Cooling project: engineering aspects of cooling section 费米实验室电子冷却项目:工程方面的冷却部分
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-25 DOI: 10.1109/PAC.2001.986698
J. Leibfritz, K. Carlson, A. Crawford, A. Makarov, M. McGee, S. Nagaitsev, G. Saewert, F. Saffrahn, A. Shemyakin, A. Warner
{"title":"Fermilab Electron Cooling project: engineering aspects of cooling section","authors":"J. Leibfritz, K. Carlson, A. Crawford, A. Makarov, M. McGee, S. Nagaitsev, G. Saewert, F. Saffrahn, A. Shemyakin, A. Warner","doi":"10.1109/PAC.2001.986698","DOIUrl":"https://doi.org/10.1109/PAC.2001.986698","url":null,"abstract":"The Fermilab Electron Cooling project involves interacting a 4.3 MeV, 0.5 A DC electron beam with 8.9 GeV/c antiprotons in the FNAL Recycler Ring. This interaction occurs through a 20-meter long cooling section consisting of 10 solenoid modules. This cooling process would lead to an increase in the Tevatron collider luminosity needed to support the Run IIb parameters. There are several important engineering aspects of this cooling section including: solenoid design, vacuum system design, magnetic shielding, support system, and alignment methods. Details of the engineering issues related to each of these areas will be discussed.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126665963","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
High current density negative ion source for beam line transport studies 用于束流输运研究的高电流密度负离子源
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-25 DOI: 10.1109/PAC.2001.987286
V. Dudnikov, C. Schmidt, R. Hren, J. Wendt
{"title":"High current density negative ion source for beam line transport studies","authors":"V. Dudnikov, C. Schmidt, R. Hren, J. Wendt","doi":"10.1109/PAC.2001.987286","DOIUrl":"https://doi.org/10.1109/PAC.2001.987286","url":null,"abstract":"The Fermilab Electron Cooling Program requires a 20 m solenoidal region to interact 8-GeV antiprotons with an escorting beam of 4.3-MeV electrons to improve the phase-space quality of the antiproton beam. The solenoidal section with additional transport lines to take and return a 0.5-A electron beam from an electrostatic accelerator, for energy recovery, must be precisely aligned and adjusted. For the initial setup and study, and later testing of this line, a 12.4-keV H/sup -/ beam can be used to simulate the 4.3 MeV electron beam. For this purpose a high-brightness H/sup -/ ion source has been developed and tested. The source, a semiplanatron type, with a hollow cathode discharge and spherical cathode focusing of the emitted ions to the emission aperture has given an emission current density up to 0.7 A/cm/sup 2/. Continuous operation of 4 weeks has been demonstrated. Such an optimized source could have many applications for tandem accelerators, ion beam lithography and ion implantation.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132247501","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
30 years of high-intensity negative ion sources for accelerators 30年的加速器高强度负离子源
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-25 DOI: 10.1109/PAC.2001.987285
V. Dudnikov
{"title":"30 years of high-intensity negative ion sources for accelerators","authors":"V. Dudnikov","doi":"10.1109/PAC.2001.987285","DOIUrl":"https://doi.org/10.1109/PAC.2001.987285","url":null,"abstract":"Thirty years ago, July 1, 1971, significant enhancement of negative ion emission from a gas discharge following an admixture of cesium was observed for the first time. This observation become the basis for the development of Surface Plasma Sources (SPS) for efficient production of negative ions from the interaction of plasma particles with electrodes on which adsorbed cesium reduced the surface work-function. The emission current density of negative ions increased rapidly from j/spl sim/ 10 mA/cm/sup 2/ to 3.7 A/cm/sup 2/ with a flat cathode and up to 8 A/cm/sup 2/ with an optimized geometrical focusing in the long pulse SPS, and to 0.3 A/cm/sup 2/ for DC SPS, recently increased up to 0.7 A/cm/sup 2/. Discovery of charge-exchange cooling helped decrease the negative ion temperature T below 1 eV, and increase brightness by many orders to a level compatible with the best proton sources, B=j/T> 1 A/cm/sup 2/ eV. The combination of the SPS with charge-exchange injection improved large accelerator operation and has permitted beam accumulation up to the space-charge limit and overcome this limit several times. The early SPS for accelerators have been in operation without modification for /spl sim/25 years. An advanced version of the SPS for accelerators will be described. Features of negative ion beam formation, transportation, space-charge neutralization-overneutralization, and instability damping will be considered. Practical aspects of SPS operation and high brightness beam production will be discussed.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132520494","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
Improving the linearity of ferrite loaded cavities using feedback 利用反馈改善铁氧体加载腔的线性度
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-25 DOI: 10.1109/PAC.2001.986507
J. Dey, J. Steimel
{"title":"Improving the linearity of ferrite loaded cavities using feedback","authors":"J. Dey, J. Steimel","doi":"10.1109/PAC.2001.986507","DOIUrl":"https://doi.org/10.1109/PAC.2001.986507","url":null,"abstract":"A simple beam loading compensation system was installed for the Fermilab Main Injector Coalescing Cavities. This paper describes the design and implementation of the feedback system. These modifications improved the linear dynamic range of operation of the ferrite loaded cavity.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"172 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122994262","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
A fast injection kicker system for the Tevatron Tevatron的快速注入启动系统
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-25 DOI: 10.1109/PAC.2001.988232
C. Jensen, R. Reilly, Fermilab B. Hanna
{"title":"A fast injection kicker system for the Tevatron","authors":"C. Jensen, R. Reilly, Fermilab B. Hanna","doi":"10.1109/PAC.2001.988232","DOIUrl":"https://doi.org/10.1109/PAC.2001.988232","url":null,"abstract":"A new proton injection kicker system is required for the Tevatron in the Run II era. The new system was designed to supply 1.25 kG-m into a magnetic aperture of 48 mm vertical /spl times/ 71 mm horizontal /spl times/ 5 m long with a 396 ns bunch spacing. The system was designed to be upgraded to 132 ns bunch spacing with additional pulse supplies. The system design tradeoffs needed to meet these goals will be discussed. These include the system topology, the system impedance and the number of magnets. This system has been installed in the Tevatron.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131432152","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 Fermilab Recycler ring 费米实验室回收环
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-24 DOI: 10.1109/PAC.2001.987423
Martin Hu
{"title":"The Fermilab Recycler ring","authors":"Martin Hu","doi":"10.1109/PAC.2001.987423","DOIUrl":"https://doi.org/10.1109/PAC.2001.987423","url":null,"abstract":"The Fermilab Recycler is a permanent magnet storage ring for the accumulation of antiprotons from the Antiproton Source, and the recovery and cooling of the antiprotons remaining at the end of a Tevatron store. It is an integral part of the Fermilab III luminosity upgrade. The following paper describes the design features, operational and commissioning status of the Recycler Ring.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126878393","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: 21
Intense electron beam disruption due to ion release from surfaces 离子从表面释放引起的强电子束破坏
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-07-24 DOI: 10.1109/PAC.2001.988087
H. Davis, C. Vermare, T. Hughes, D. Moir, R. Olson, W. Wood
{"title":"Intense electron beam disruption due to ion release from surfaces","authors":"H. Davis, C. Vermare, T. Hughes, D. Moir, R. Olson, W. Wood","doi":"10.1109/PAC.2001.988087","DOIUrl":"https://doi.org/10.1109/PAC.2001.988087","url":null,"abstract":"A major concern for the DARHT second axis (2 kA, 18.6 MeV, 2000 ns) is that ions or ionized neutrals released from solid surfaces (e.g., apertures, septums, dumps, and targets) by beam impact can be accelerated and trapped by the beam potential. This positive charge could disrupt the beam. To study this, experiments were performed on the DARHT first axis. The beam, focused to a range of diameters, is transmitted through thin foils made of various materials. The time-dependent beam radial profile is measured downstream of the target. For low current density, the downstream-beam profile is time invariant as expected. At higher current density, the downstream-beam radius changes during the pulse followed by the transverse instability.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123635348","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
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