PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)最新文献_第2页

Proposing a laser based beam size monitor for the future linear collider 为未来的直线对撞机提出了一种基于激光的光束尺寸监视器

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-12-01 DOI: 10.1109/PAC.2001.986673

G. Blair, J. Frisch, K. Honkavaara, T. Kamps, F. Poirier, I. Ross, M. Ross, H. Schlarb, P. Schmuser, S. Schreiber, D. Sertore, N. Walker, M. Wendt, K. Wittenburg

{"title":"Proposing a laser based beam size monitor for the future linear collider","authors":"G. Blair, J. Frisch, K. Honkavaara, T. Kamps, F. Poirier, I. Ross, M. Ross, H. Schlarb, P. Schmuser, S. Schreiber, D. Sertore, N. Walker, M. Wendt, K. Wittenburg","doi":"10.1109/PAC.2001.986673","DOIUrl":"https://doi.org/10.1109/PAC.2001.986673","url":null,"abstract":"Compton scattering techniques for the measurement of the transverse beam size of particle beams at future linear colliders (FLC) are proposed. At several locations of the beam delivery system (BDS) of the FLC, beam spot sizes ranging from several hundreds to a few micrometers have to be measured. This is necessary to verify beam optics, to obtain the transverse beam emittance, and to achieve the highest possible luminosity. The large demagnification of the beam in the BDS and the high beam power puts extreme conditions on any measuring device. With conventional techniques at their operational limit in FLC scenarios, new methods for the detection of the transverse beam size have to be developed. For this laser based techniques are proposed capable of measuring high power beams with sizes in the micrometer range. In this paper general aspects and critical issues of a generic device are outlined and specific solutions proposed. Plans to install a laser wire experiment at an accelerator test facility are presented.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117103486","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

The IPNS RCS RF-system third cavity upgrade IPNS RCS射频系统第三空腔升级

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-12-01 DOI: 10.1109/PAC.2001.986491

M. Middendorf, F. Brumwell, J. Dooling, M. Lien, G. Mcmichael

引用次数: 4

Particle physics-future directions 粒子物理学——未来的方向

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-11-22 DOI: 10.1109/PAC.2001.987624

C. Quigg

引用次数: 1

How to commission, operate and maintain a large future accelerator complex from far remote sites 如何从遥远的地方委托、操作和维护一个大型的未来加速器

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-10-13 DOI: 10.1109/PAC.2001.987487

P. Czarapata, D. Hartill, S. Myers, S. Peggs, N. Phinney, M. Serio, N. Toge, F. Willeke, C. Zhang

{"title":"How to commission, operate and maintain a large future accelerator complex from far remote sites","authors":"P. Czarapata, D. Hartill, S. Myers, S. Peggs, N. Phinney, M. Serio, N. Toge, F. Willeke, C. Zhang","doi":"10.1109/PAC.2001.987487","DOIUrl":"https://doi.org/10.1109/PAC.2001.987487","url":null,"abstract":"A study on future large accelerators has considered a facility, which is designed, built and operated by a worldwide collaboration of equal partner institutions, and which is remote from most of these institutions. The full range of operation was considered including commissioning, machine development, maintenance, trouble shooting and repair. Experience from existing accelerators confirms that most of these activities are already performed 'remotely'. The large high-energy physics experiments and astronomy projects, already involve international collaborations of distant institutions. Based on this experience, the prospects for a machine operated remotely from far sites are encouraging. Experts from each laboratory would remain at their home institution but continue to participate in the operation of the machine after construction. Experts are required to be on site only during initial commissioning and for particularly difficult problems. Repairs require an on-site non-expert maintenance crew. Most of the interventions can be made without an expert and many of the rest resolved with remote assistance. There appears to be no technical obstacle to controlling an accelerator from a distance. The major challenge is to solve the complex management and communication problems.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124564542","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

The PEP-N interaction region PEP-N相互作用区

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-10-11 DOI: 10.1109/PAC.2001.988180

M. Sullivan, M. Biagini, J. Seeman, U. Wienands, M. Placidi

{"title":"The PEP-N interaction region","authors":"M. Sullivan, M. Biagini, J. Seeman, U. Wienands, M. Placidi","doi":"10.1109/PAC.2001.988180","DOIUrl":"https://doi.org/10.1109/PAC.2001.988180","url":null,"abstract":"The PEP-N project consists of a small, very low-energy e/sup -/ storage ring (VLER) located in one of the interaction-straight regions of PEP-II. The small ring is brought into collision with the low-energy (3.1 GeV) e/sup +/ beam (LER). The center-of-mass energies from this collision are between the /spl Phi/ and J//spl psi/ resonances. We achieve a head-on collision through the use! of a central magnetic dipole field that generates a large horizontal bending field. This field is also the central field of the detector. The large energy range of the VLER, in order to maximize the center-of-mass energy range, complicates the collision point geometry. In order to maintain the beam orbits near the collision point two techniques are used. The first is to scale the central dipole field up and down with the energy of the VLER and the second is to use passive shielding to decrease the integral B/spl middot/dl of the dipole field seen by the VLER. Changes in the orbit of the LER are corrected with local bending magnets. Further details of the interaction region geometry as well as design issues that include synchrotron radiation from the high-current positron beam are discussed.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122689077","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

A low-energy ring lattice design for the PEP-N project PEP-N项目的低能环晶格设计

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-10-11 DOI: 10.1109/PAC.2001.988170

M. Biagini, Y. Cai, J. Seeman, M. Sullivan, U. Wienands, M. Placidi

引用次数: 1

Adjustable permanent quadrupoles for the Next Linear Collider 下一个线性对撞机的可调永久四极

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-10-02 DOI: 10.1109/PAC.2001.987474

J. Volk, J. DiMarco, G. Foster, W. Fowler, V. Kashikhin, A. Makarov, V. Tsvetkov, C. Rago, A. Ringwall, C. Spencer, Z. Wolf

引用次数: 24

Comparative study of medium damped and detuned linear accelerator structures 介质阻尼与失谐直线加速器结构的比较研究

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-09-14 DOI: 10.1109/PAC.2001.988254

J. Ostiguy, K. Ng, Z. Li, R. Jones

{"title":"Comparative study of medium damped and detuned linear accelerator structures","authors":"J. Ostiguy, K. Ng, Z. Li, R. Jones","doi":"10.1109/PAC.2001.988254","DOIUrl":"https://doi.org/10.1109/PAC.2001.988254","url":null,"abstract":"Long range wakefields are a serious concern for a future linear collider based on room temperature accelerating structures. They can be suppressed either by detuning and or local damping or with some combination of both strategies. Detuning relies on precisely phasing the contributions of the dipole modes excited by the passage of a single bunch. This is accomplished by controlling individual mode frequencies, a process which dictates individual cell dimensional tolerances. Each mode must be excited with the correct strength; this in turn, determines cell-to-cell alignment tolerances. In contrast, in a locally damped structure, the modes are attenuated at the cell level. Clearly, mode frequencies and relative excitation become less critical in that context; mechanical fabrication tolerances can be relaxed. While local damping is ideal from the standpoint of long range wakefield suppression, this comes at the cost of reducing the shunt impedance and possibly unacceptable localized heating. Recently, the Medium Damped Structure (MDS), a compromise between detuning and local damping, has generated some interest. In this paper, we compare a hypothetical MDS to the NLC Rounded Damped Detuned Structure (RDDS) and investigate possible advantages from the standpoint fabrication tolerances and their relation to beam stability and emittance preservation.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129723321","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

Room temperature accelerator structures for linear colliders 线性对撞机的室温加速器结构

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-08-29 DOI: 10.1109/PAC.2001.988264

R.H. Miller, R. Jones, C. Adolphsen, G. Bowden, V. Dolgashev, N. Kroll, Z. Li, R. Loewen, C. Ng, C. Pearson, T. Raubenheimer, R. Ruth, Sami G. Tantawi, J.W. Wang

{"title":"Room temperature accelerator structures for linear colliders","authors":"R.H. Miller, R. Jones, C. Adolphsen, G. Bowden, V. Dolgashev, N. Kroll, Z. Li, R. Loewen, C. Ng, C. Pearson, T. Raubenheimer, R. Ruth, Sami G. Tantawi, J.W. Wang","doi":"10.1109/PAC.2001.988264","DOIUrl":"https://doi.org/10.1109/PAC.2001.988264","url":null,"abstract":"Early tests of short low group velocity and standing wave structures indicated the viability of operating X-band linacs with accelerating gradients in excess of 100 MeV/m. Conventional scaling of traveling wave traveling wave linacs with frequency scales the cell dimensions with /spl lambda/. Because Q scales as /spl lambda//sup 1/2/, the length of the structures scale not linearly but as /spl lambda//sup 3/2/ in order to preserve the attenuation through each structure. For the NLC we chose not to follow this scaling from the SLAC S-band linac to its fourth harmonic at the X-band. We wanted to increase the length of the structures to reduce the number of couplers and waveguide drives which can be a significant part of the cost of a microwave linac. Furthermore, scaling the iris size of the disk-loaded structures gave unacceptably high short range dipole wakefields. Consequently, we chose to go up a factor of about 5 in average group velocity and length of the structures, which increases the power fed to each structure by the same factor and decreases the short range dipole wakes by a similar factor. Unfortunately, these longer (1.8 m) structures have not performed nearly as well in high gradient tests as the short structures. We believe we have at least a partial understanding of the reason and will discuss it below. We are now studying two types of short structures with large apertures with moderately good efficiency including: 1) traveling wave structures with the group velocity lowered by going to large phase advance per period with bulges on the iris, 2) /spl pi/ mode standing wave structures.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125566795","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

62-TeV center of mass hadron collider with capability for super bunch beams 具有超束束束流能力的62-TeV质量中心强子对撞机

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Pub Date : 2001-08-22 DOI: 10.1109/PAC.2001.988042

R. Yamada, K. Takayama, J. Kishiro, M. Wake, T. Toyama, Y. Shimosaki

引用次数: 2