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

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Longitudinal instability due to the randomness of higher mode frequencies of RF cavity 射频腔高模频率的随机性引起的纵向不稳定性
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.750769
S. Nam, T.Y. Kim
{"title":"Longitudinal instability due to the randomness of higher mode frequencies of RF cavity","authors":"S. Nam, T.Y. Kim","doi":"10.1109/PAC.1997.750769","DOIUrl":"https://doi.org/10.1109/PAC.1997.750769","url":null,"abstract":"The resonance frequencies, shunt impedances and Q-values for the higher order modes in our designed cavity are calculated by the computer codes URMEL and MAFIA. The longitudinal instabilities for the higher order modes are calculated by the eigenmode analysis of Sacherer's (1977) integral equation. The growth rates and the tune shifts in the electron storage ring are calculated by considering the randomness of the higher mode frequencies of a cavity due to the construction errors. The results with the construction errors are compared to those of without error cases for the dipole mode and quadrupole mode.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"22 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":"116913624","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
Online calculation of Tevatron collider luminosity using accelerator instrumentation 利用加速器仪器在线计算Tevatron对撞机光度
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.751164
A. Hahn
{"title":"Online calculation of Tevatron collider luminosity using accelerator instrumentation","authors":"A. Hahn","doi":"10.1109/PAC.1997.751164","DOIUrl":"https://doi.org/10.1109/PAC.1997.751164","url":null,"abstract":"The luminosity of a collision region may be calculated if one understands the lattice parameters and measures the beam intensities, the transverse and longitudinal emittances, and the individual proton and antiproton beam trajectories (space and time) through the collision region. This paper explores an attempt to make this calculation using beam instrumentation during Run 1b of the Tevatron. The instrumentation used is briefly described. The calculations and their uncertainties are compared to luminosities calculated independently by the Collider Experiments (CDF and D0).","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"35 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":"121249795","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
A bunch clock for the Advanced Photon Source 高级光子源的一堆时钟
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.751250
{"title":"A bunch clock for the Advanced Photon Source","authors":"","doi":"10.1109/PAC.1997.751250","DOIUrl":"https://doi.org/10.1109/PAC.1997.751250","url":null,"abstract":"A bunch clock timing module has been developed for use by Advanced Photon Source beamlines. The module provides bunch pattern and timing information that can be used to trigger beamline data collection equipment. The module is fully integrated into the control system software (EPICS) which automatically loads it with the storage ring fill pattern at injection time. Fast timing outputs (1 ns FWHM) for each stored bunch are generated using the storage ring low-level rf and revolution clock as input references. Fiber-optic-based transmitters and receivers are used to transmit a 352-MHz low-level rf reference to distributed bunch clock modules. The bunch clock module is a single-width VME module and may be installed in a VME crate located near beamline instrumentation. A prototype has been in use on the SRI CAT beamline for over a year. The design and integration into the control system timing software along with measured performance results are presented.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"62 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":"127186462","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 National Spallation Neutron Source target station: a general overview 国家散裂中子源靶站:总览
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.749552
Tony A. Gabriel, J. N. Barnes, Lowell A. Charlton, DiStefano, Ken Fanell, John R Haines, Jeffrey 0. Johnson, Louis K. Mansur, Steve J. Pawel, Moshe Siman-Tov, Rusi Taleyarkhan, T. Mcmanamy, J. Rennich
{"title":"The National Spallation Neutron Source target station: a general overview","authors":"Tony A. Gabriel, J. N. Barnes, Lowell A. Charlton, DiStefano, Ken Fanell, John R Haines, Jeffrey 0. Johnson, Louis K. Mansur, Steve J. Pawel, Moshe Siman-Tov, Rusi Taleyarkhan, T. Mcmanamy, J. Rennich","doi":"10.1109/PAC.1997.749552","DOIUrl":"https://doi.org/10.1109/PAC.1997.749552","url":null,"abstract":"The technologies that are being utilized to design and build a state-of-the-art neutron spallation source, the National Spallation Neutron Source (NSNS), are discussed. Emphasis is given to the technology issues that present the greatest scientific challenges. The present facility configuration, ongoing analysis and the planned hardware research and development program are also described.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"32 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":"127237283","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
TiN coating of the PEP-II low-energy aluminum arc vacuum chambers PEP-II型低能铝弧真空室的TiN涂层
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.753276
K. Kennedy, B. Harteneck, G. Millos, M. Benapfl, F. King, R. Kirby
{"title":"TiN coating of the PEP-II low-energy aluminum arc vacuum chambers","authors":"K. Kennedy, B. Harteneck, G. Millos, M. Benapfl, F. King, R. Kirby","doi":"10.1109/PAC.1997.753276","DOIUrl":"https://doi.org/10.1109/PAC.1997.753276","url":null,"abstract":"The PEP-II Low-Energy Ring will operate at a nominal energy of 3.1 GeV with a positron beam current of 2.1 A. Design parameters for vacuum components are 3.5 GeV at 3 A. The arc vacuum system is based on an aluminum antechamber concept. It consists of 192 pairs of 2 m long magnet chambers and 5.5 m long pumping chambers. Titanium nitride coating of the entire positron duct is needed in order to suppress beam instabilities caused by multipactoring and the \"electron-cloud\" effect. An extensive R&D program has been conducted to develop coating parameters that give proper stoichiometry and a suitable thickness of TiN. The total secondary emission yield of TiN-coated aluminum coupons has been measured after the samples were exposed to air and again after electron-beam bombardment. A coating facility has been built to cope with the large quantity of production chambers and the very tight schedule requirements.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"22 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":"127444116","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 high-DC-voltage GaAs photoemission gun: Transverse emittance and momentum spread measurements 高直流电压砷化镓光发射枪:横向发射度和动量扩散测量
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.752734
D. Engwall, C. Bohn, L. Cardman, B. Dunham, D. Kehne, R. Legg, H. Liu, M. Shinn., C. Sinclair
{"title":"A high-DC-voltage GaAs photoemission gun: Transverse emittance and momentum spread measurements","authors":"D. Engwall, C. Bohn, L. Cardman, B. Dunham, D. Kehne, R. Legg, H. Liu, M. Shinn., C. Sinclair","doi":"10.1109/PAC.1997.752734","DOIUrl":"https://doi.org/10.1109/PAC.1997.752734","url":null,"abstract":"We have built a high-DC-voltage photoemission gun and a diagnostic beamline permitting us to measure rms transverse emittance (/spl epsi//spl tilde//sub x/) and rms momentum spread (/spl delta/) of short-duration electron pulses produced by illuminating the cathode with light from a mode-locked, frequency-doubled Nd:YLF laser. The electron gun is a GaAs photocathode source designed to operate at 500 kV. We have measured /spl epsi//spl tilde//sub x/ and /spl delta/ for conditions ranging from emittance-dominated to space-charge-dominated. We report these measurements as functions of microbunch charge for different beam radii, pulse lengths, and voltages/field gradients at the cathode, and compare them with PARMELA calculations.","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":"127456409","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: 17
A scaled beam-combining experiment for heavy ion inertial fusion 重离子惯性聚变的标度束合并实验
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.751063
P. Seidl, C. Celata, W. Chupp, A. Faltens, W. Fawley, W. Ghiorso, K. Hahn, E. Henestroza, S. Maclaren, C. Peters
{"title":"A scaled beam-combining experiment for heavy ion inertial fusion","authors":"P. Seidl, C. Celata, W. Chupp, A. Faltens, W. Fawley, W. Ghiorso, K. Hahn, E. Henestroza, S. Maclaren, C. Peters","doi":"10.1109/PAC.1997.751063","DOIUrl":"https://doi.org/10.1109/PAC.1997.751063","url":null,"abstract":"Transverse beam combining is a cost-saving option employed in many designs for induction linac heavy ion fusion drivers. The resultant transverse emittance increase, due predominantly to anharmonic space charge forces, must be kept minimal so that the beam remains focusable at the target. A prototype combining experiment has been built and preliminary results are presented. Four sources each produce up to 4.8 mA Cs/sup +/ beams at 160 keV. Focusing upstream of the merge consists of four quadrupoles and a final combined-function element (quadrupole and dipole). All lattice elements of the prototype are electrostatic. Due to the small distance between beams near the merge (/spl sim/3-4 mm), the electrodes here are a cage of small rods, each at different voltage.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"80 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":"124860691","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
Detection of beam induced dipole-mode signals in the SLC S-band structures SLC s波段结构中光束诱导偶极子模式信号的检测
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.751127
M. Seidel, C. Adolphsen, R. Assmann, D. Whittum
{"title":"Detection of beam induced dipole-mode signals in the SLC S-band structures","authors":"M. Seidel, C. Adolphsen, R. Assmann, D. Whittum","doi":"10.1109/PAC.1997.751127","DOIUrl":"https://doi.org/10.1109/PAC.1997.751127","url":null,"abstract":"Beam emittance dilution caused by wakefield effects is one of the important issues in the SLC linac. The detection of beam induced dipole mode signals in the C-band range could provide a direct measure of the strength of transverse wakefield kicks the beam experiences in the accelerating structures. We investigate the applicability of these microwave signals for beam steering purposes. The RF distribution system in the linac sectors 2, 6 and 29 has been equipped with a simple experimental setup to observe the beam induced dipole mode signals. The paper discusses the setup, the mode-structure of the observed signals as well as experimental results from beam steering scans, obtained during the 95/96 SLC runs.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"53 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":"124883118","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
Linear optics correction in the CEBAF accelerator CEBAF加速器的线性光学校正
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.751130
V. Lebedev, M. Bickley, J. Bisognano, S. Schaffner, J. van Zeijts, G. Krafft, M. Tiefenback, W. Watson, B. Yunn
{"title":"Linear optics correction in the CEBAF accelerator","authors":"V. Lebedev, M. Bickley, J. Bisognano, S. Schaffner, J. van Zeijts, G. Krafft, M. Tiefenback, W. Watson, B. Yunn","doi":"10.1109/PAC.1997.751130","DOIUrl":"https://doi.org/10.1109/PAC.1997.751130","url":null,"abstract":"During commissioning of the CEBAF accelerator, correcting dispersion, momentum compaction and betatron beam envelopes was essential for robust operation. To speed the diagnostic process we developed a method which allows one to track and correct the machine optics on-line. The method is based on measuring the propagation of 30 Hz modulated betatron oscillations. The beam optics of the accelerator was altered to decrease lattice sensitivity at critical points and to simplify control of the betatron function match. The calculation of the Courant-Snyder invariant from signals of each pair of beam position monitors was used for a correction of the betatron functions. The experience of optics correction and the study of long and short term machine reproducibility obtained during 1996 and early 1997 are also discussed. With minor modifications this method can also be used for on-line optics measurement and correction in circular accelerators.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"75 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":"126132729","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
Analysis and measurements of eddy current effects of a beam tube in a pulsed magnet 脉冲磁体中束流管涡流效应的分析与测量
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.753171
S. Fang, W. Chou
{"title":"Analysis and measurements of eddy current effects of a beam tube in a pulsed magnet","authors":"S. Fang, W. Chou","doi":"10.1109/PAC.1997.753171","DOIUrl":"https://doi.org/10.1109/PAC.1997.753171","url":null,"abstract":"The power supply design of the /spl gamma//sub t/-jump system in FNAL Main Injector uses a resonant circuit. A critical design parameter is the AC losses of the beam tube in a pulsed quadrupole. This paper gives an analysis to this problem. An equivalent circuit model based on the impedance measurement was established. The measured and calculated losses are in agreement. Another effect of the eddy current is the distortion of the magnetic field inside the beam tube. A Morgan coil was used for field measurements up to 10 KHz. These results are presented in this paper.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"33 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":"123289575","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
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