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

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The superconducting interaction region magnet system for the CESR phase III upgrade CESR三期升级超导相互作用区磁体系统
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.753216
J. Welch, G. Dugan, E. Nordberg, D. Rice
{"title":"The superconducting interaction region magnet system for the CESR phase III upgrade","authors":"J. Welch, G. Dugan, E. Nordberg, D. Rice","doi":"10.1109/PAC.1997.753216","DOIUrl":"https://doi.org/10.1109/PAC.1997.753216","url":null,"abstract":"In 1998 CESR and the CLEO detector will commence another major upgrade to bring their performance up to B factory levels. New interaction region (IR) insertion magnets were designed to allow the highest possible luminosity from an equal energy, crossing angle, bunch train configuration of CESR. The new magnets will have some unusual capabilities such as nested skew and dipole coils for coupling and orbit correction, and a cryostat positioning system which can adjust the position of the magnets during operation. So we expect to see increases to the data taking time due to the higher functionality: energy changes, coupling correction, magnet alignment and positioning, and beam steering will be far easier and faster. However, the intimate magnetic and mechanical coupling with the CLEO solenoid has caused design complications as well.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"44 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":"130758001","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
Integrated normal-conducting/superconducting high-power proton linac for the APT project APT项目常导/超导一体化大功率质子直线加速器
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.749960
G. Lawrence, T. Wangler
{"title":"Integrated normal-conducting/superconducting high-power proton linac for the APT project","authors":"G. Lawrence, T. Wangler","doi":"10.1109/PAC.1997.749960","DOIUrl":"https://doi.org/10.1109/PAC.1997.749960","url":null,"abstract":"The baseline accelerator design for the APT (Accelerator Production of Tritium) Project is a normalconducting-superconducting proton linac that produces a CW beam power of 170 MW at 1700 MeV. Compared with the previous all-NC linac design, the NC/SC linac provides significant power savings and lower operating and capital costs. It allows a much larger aperture at high energies, and permits greater operational flexibility. The design has been approved by high-level technical panels and is published in a Conceptual Design Report. The high-energy portion is a superconducting (SC) RF linac employing elliptical-type niobium cavities, while the low-energy portion is a normal-conducting (NC) linac constructed from copper cavities. This provides an integrated accelerator design that makes optimum use of the two technologies in their appropriate regions of application. The NC linac, which consists of an injector, RFQ, CCDTL, and CCL, accelerates a 100-mA beam to 217 MeV. The SC linac is built in two sections optimized for different beam velocity spans, with each section made up of cryomodules containing 5-cell cavities and SC singlet quads in a FODO focusing lattice. Alternate SC linac designs are being studied that employ a doublet focusing lattice using conventional quadrupoles located between cryomodules.","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":"130789990","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: 32
Measurement and analysis of longitudinal bunched beam echoes in the Fermilab Tevatron 费米实验室Tevatron中纵向束束回波的测量与分析
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.749566
S. Assadi, P. Colestock
{"title":"Measurement and analysis of longitudinal bunched beam echoes in the Fermilab Tevatron","authors":"S. Assadi, P. Colestock","doi":"10.1109/PAC.1997.749566","DOIUrl":"https://doi.org/10.1109/PAC.1997.749566","url":null,"abstract":"Bunched beam echoes have been generated in the Fermilab Tevatron using a simple impulse kick technique involving the rf system. The echoes occur as a result of the nonlinear mixing of quadrupole and dipole components of successive impulse kicks, and may be readily observed using a bunch phase measurement system. The echo contains information on the synchrotron tune spread, as well as on various nonlinear phenomena, including the nonlinear tune spread and the effects of noise on the incoherent synchrotron motion. By measuring the detailed form of the echo response as well as its overall envelope as a function of the echo delay time, it is possible, in principle, to extract some of this information. In this paper we present experimental results along with a perturbation model which includes the effects of a nonlinear tune spread. In particular, we wish to explain the observed rapid decay of the echo envelope in terms of relevant beam parameters.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"180 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":"131104739","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
Encapsulated target for isotope production cyclotrons 同位素生产回旋加速器的封装靶
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.753434
S. Bakhtiari, W. Gelbart, W. Ho, N. Stevenson
{"title":"Encapsulated target for isotope production cyclotrons","authors":"S. Bakhtiari, W. Gelbart, W. Ho, N. Stevenson","doi":"10.1109/PAC.1997.753434","DOIUrl":"https://doi.org/10.1109/PAC.1997.753434","url":null,"abstract":"The current solid isotope production targets at TRIUMF can only be used to irradiate metallic materials with high melting points. In order to irradiate liquids, powders, and materials with low melting points, a new encapsulated target is being developed specifically for use on isotope production cyclotrons. This concentrically water-cooled target must withstand a 240 /spl mu/A@30 MeV proton beam. The target is a round container with a pocket to hold the target material; the target material is encapsulated using a thin foil, which is electron-beam welded onto the target. The cooling and the heat-induced stresses of the target are being analysed using finite element methods. The results will then be compared with actual measurements obtained using surface embedded thermocouples. The paper discusses the results and the current status of the project.","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":"131192988","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
Analytic and numerical analysis of the longitudinal coupling impedance of an annular cut in a coaxial liner 同轴管道环形切口纵向耦合阻抗的解析与数值分析
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.750993
A. Fedotov, R. Gluckstern
{"title":"Analytic and numerical analysis of the longitudinal coupling impedance of an annular cut in a coaxial liner","authors":"A. Fedotov, R. Gluckstern","doi":"10.1109/PAC.1997.750993","DOIUrl":"https://doi.org/10.1109/PAC.1997.750993","url":null,"abstract":"Beam pipes of high-energy superconducting colliders require a shielding tube (liner) with pumping slots to screen cold chamber walls from synchrotron radiation. Pumping slots in the liner walls are required to keep high vacuum inside the beam pipe and provide for a long beam lifetime. As previously discussed [Fedotov and Gluckstern, Phys. Rev. E 54, 1930 (1996)], for a long narrow slot whose length may be comparable with the wavelength, the usual static approximation for the polarizability and susceptibility which enter into the impedance is a poor one. Our objective is eventually to analyze and obtain numerical values for a rectangular slot of arbitrary dimensions. In this paper we present an analysis, based on a variational formulation, for the impedance of an annular cut in the inner conductor, including both the realistic coaxial structure of the beam-pipe and the effect of finite wavelength. For low frequencies, the numerical results are checked against analytical results, with which they agree.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"38 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":"132884972","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
Instability analysis of an active higher-harmonic cavity 有源高谐波腔的不稳定性分析
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.749862
R. Bosch
{"title":"Instability analysis of an active higher-harmonic cavity","authors":"R. Bosch","doi":"10.1109/PAC.1997.749862","DOIUrl":"https://doi.org/10.1109/PAC.1997.749862","url":null,"abstract":"A radiofrequency system with an active higher-harmonic (\"Landau\") cavity may prevent coupled-bunch instabilities and increase the bunch lifetime of an electron storage ring. However, the equilibrium phase and Robinson instabilities must be avoided. An algorithm is presented for evaluating an active Landau cavity, and applied to the electron storage ring, Aladdin.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"12 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":"132993448","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
Transverse beam feedback system in the PLS PLS中的横向波束反馈系统
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.751205
J. Huang, M.K. Park, M. Kwon, M. Yoon, I. Ko
{"title":"Transverse beam feedback system in the PLS","authors":"J. Huang, M.K. Park, M. Kwon, M. Yoon, I. Ko","doi":"10.1109/PAC.1997.751205","DOIUrl":"https://doi.org/10.1109/PAC.1997.751205","url":null,"abstract":"A bunch by bunch transverse feedback system, as a complement of the longitudinal feedback system required for the suppression of the coupled bunch beam instabilities, has been developed and undergoing testing in the PLS. Major components are two beam oscillation detectors, betatron phase adjuster, notch filters and a stripline kicker. Each system component and its functions are described with simple trigonometric calculations. Preliminary result of the beam test has shown 30 dB damping of the beam oscillation.","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":"133706283","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
Automated path length and M/sub 56/ measurements at Jefferson Lab 杰斐逊实验室自动路径长度和M/sub 56/测量
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.751177
D. Hardy, J. Tang, R. Legg, M. Tiefenback, M. Crofford, G. Krafft
{"title":"Automated path length and M/sub 56/ measurements at Jefferson Lab","authors":"D. Hardy, J. Tang, R. Legg, M. Tiefenback, M. Crofford, G. Krafft","doi":"10.1109/PAC.1997.751177","DOIUrl":"https://doi.org/10.1109/PAC.1997.751177","url":null,"abstract":"Accurate measurement of path length and path length changes versus momentum (M/sub 56/) are critical for maintaining minimum beam energy spread in the CEBAF (Continuous Electron Beam Accelerator Facility) accelerator at the Thomas Jefferson National Accelerator Facility (Jefferson Lab). The relative path length for each circuit of the beam (1256 m) must be equal within 1.5 degrees of 1497 MHz RF phase. A relative path length measurement is made by measuring the relative phases of RF signals from a cavity that is separately excited for each pass of a 4.2 /spl mu/s pulsed beam. This method distinguishes the path length to less than 0.5 degrees of RF (<280 /spl mu/m) and gives the direction of the path length error. The development of a VME based automated measurement system for path length and M/sub 56/ has contributed to faster machine setup time and has the potential for use as a feedback parameter for automated control.","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":"132451214","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
Transverse instability in high intensity proton rings 高强度质子环的横向不稳定性
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.751049
S.Y. Zhang, W. Weng
{"title":"Transverse instability in high intensity proton rings","authors":"S.Y. Zhang, W. Weng","doi":"10.1109/PAC.1997.751049","DOIUrl":"https://doi.org/10.1109/PAC.1997.751049","url":null,"abstract":"Most high intensity proton rings are at low energy below transition. Several aspects of the beam dynamics of this kind of rings are different from the electron or high energy rings. The transverse microwave instabilities are discussed.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"10 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":"128913996","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
Characterization and recent modification of a compact 10 GHz ECRIS for atomic physics experiments and spectroscopic investigations 用于原子物理实验和光谱研究的紧凑型10 GHz ECRIS的特性和最新改进
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI: 10.1109/PAC.1997.752738
M. Schlapp, R. Trassl, R. McCullough, J. Greenwood, E. Salzborn
{"title":"Characterization and recent modification of a compact 10 GHz ECRIS for atomic physics experiments and spectroscopic investigations","authors":"M. Schlapp, R. Trassl, R. McCullough, J. Greenwood, E. Salzborn","doi":"10.1109/PAC.1997.752738","DOIUrl":"https://doi.org/10.1109/PAC.1997.752738","url":null,"abstract":"A compact 10 ECR ion source (200 mm long, 170 mm diameter) has been developed and tested. The complete magnetic structure made from permanent magnet material is comprised of four ring magnets producing an asymmetric axial magnetic field and a hexapole magnet with a maximum radial field of 0.94 T inside the plasma chamber. The coupling of the microwave to the plasma shows efficient ECR plasma heating at microwave power levels around 10 watts. Charge state distributions for various elements with intensities up to 320 e/spl mu/A and their dependence on operation parameters will be presented as well as VUV spectra in the wavelength region down to 15 nm.","PeriodicalId":122662,"journal":{"name":"Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)","volume":"109 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":"131280627","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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