A. Lumpkin, B. Yang, W. Berg, J. Lewellen, S. Milton
The Advanced Photon Source (APS) injector includes an S-band linac with the capability to accelerate beams to 650 MeV. The linac has recently been upgraded with the installation of an RF thermionic gun in addition to the standard DC thermionic gun. The RF gun is predicted to have lower emittance (5 /spl pi/ mm mrad) and may be used to support the APS self-amplified spontaneous emission (SASE) experiments. The critical characterization of this gun's beam has begun with a beam diagnostics station at the end of the linac that can address beam transverse size, emittance, and bunch length (peak current). This station uses both an optical transition radiation (OTR) screen at 45/spl deg/ to the beam direction and a Ce-doped YAG single crystal normal to the beam with a 45/spl deg/ mirror behind it. The visible light images are detected by a Vicon CCD camera and a Hamamatsu C5680 synchroscan streak camera. Spatial resolution of about 30 /spl mu/m (/spl sigma/) and temporal resolution of 1 ps (/spl sigma/) have been demonstrated. Examples of RF gun beam characterization at 220 MeV are reported.
{"title":"High-brightness beam diagnostics for the APS linac","authors":"A. Lumpkin, B. Yang, W. Berg, J. Lewellen, S. Milton","doi":"10.1109/PAC.1999.794397","DOIUrl":"https://doi.org/10.1109/PAC.1999.794397","url":null,"abstract":"The Advanced Photon Source (APS) injector includes an S-band linac with the capability to accelerate beams to 650 MeV. The linac has recently been upgraded with the installation of an RF thermionic gun in addition to the standard DC thermionic gun. The RF gun is predicted to have lower emittance (5 /spl pi/ mm mrad) and may be used to support the APS self-amplified spontaneous emission (SASE) experiments. The critical characterization of this gun's beam has begun with a beam diagnostics station at the end of the linac that can address beam transverse size, emittance, and bunch length (peak current). This station uses both an optical transition radiation (OTR) screen at 45/spl deg/ to the beam direction and a Ce-doped YAG single crystal normal to the beam with a 45/spl deg/ mirror behind it. The visible light images are detected by a Vicon CCD camera and a Hamamatsu C5680 synchroscan streak camera. Spatial resolution of about 30 /spl mu/m (/spl sigma/) and temporal resolution of 1 ps (/spl sigma/) have been demonstrated. Examples of RF gun beam characterization at 220 MeV are reported.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":"42 1","pages":"2134-2136 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1999-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80598675","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}
S. Biedron, G. Goeppner, J. Lewellen, S. Milton, A. Nassiri, G. Travish, X. Wang, N. Arnold, W. Berg, M. Babzien, C. Doose, R. Dortwegt, A. Grelick, J. Galayda, G. M. Markovich, S. Pasky, J. Power, B. Yang
At the Advanced Photon Source (APS) at Argonne National Laboratory (ANL), a free-electron laser (FEL) based on the self-amplified spontaneous emission (SASE) process is nearing completion. Recently, an RF photoinjector gun system was made available to the APS by Brookhaven National Laboratory/Accelerator Test Facility (BNL/ATF). It will be used to provide the high-brightness, low-emittance, and low-energy spread electron beam required by the SASE FEL theory. A Nd:Glass laser system, capable of producing a maximum of 500 /spl mu/J of UV in a 1-10 ps pulse at up to a 10-Hz repetition rate, serves as the photoinjector's drive laser. Here, the design, commissioning, and integration of this gun with the APS are discussed.
{"title":"The operation of the BNL/ATF GUN-IV photocathode RF gun at the Advanced Photon Source","authors":"S. Biedron, G. Goeppner, J. Lewellen, S. Milton, A. Nassiri, G. Travish, X. Wang, N. Arnold, W. Berg, M. Babzien, C. Doose, R. Dortwegt, A. Grelick, J. Galayda, G. M. Markovich, S. Pasky, J. Power, B. Yang","doi":"10.1109/PAC.1999.794360","DOIUrl":"https://doi.org/10.1109/PAC.1999.794360","url":null,"abstract":"At the Advanced Photon Source (APS) at Argonne National Laboratory (ANL), a free-electron laser (FEL) based on the self-amplified spontaneous emission (SASE) process is nearing completion. Recently, an RF photoinjector gun system was made available to the APS by Brookhaven National Laboratory/Accelerator Test Facility (BNL/ATF). It will be used to provide the high-brightness, low-emittance, and low-energy spread electron beam required by the SASE FEL theory. A Nd:Glass laser system, capable of producing a maximum of 500 /spl mu/J of UV in a 1-10 ps pulse at up to a 10-Hz repetition rate, serves as the photoinjector's drive laser. Here, the design, commissioning, and integration of this gun with the APS are discussed.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":"22 1","pages":"2024-2026 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1999-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78764331","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}
The APS storage ring beam chamber has been storing the beam up to 100 mA successfully. However, in some beam chambers, spurious signals corrupted the BPM outputs. The cause of the unwanted signals was investigated, and it was found that transverse electric (TE) longitudinal harmonic resonances of the beam chamber were responsible. The beam chambers have small height in the area between the oval beam chamber and the antechamber. The structure behaves like a ridge waveguide so that the cut-off frequency of the waveguide mode becomes lower. The pass-band then includes the frequency around 350 MHz that is important to the beam position monitors (BPMs). The spurious harmonic resonances are damped with two types of dampers to restore the useful signals of the BPMs; coaxial loop dampers and lossy ceramic slab loading are used.
{"title":"Damping spurious harmonic resonances in the APS storage ring beam chamber","authors":"Y. Kang, G. Decker, J. Song","doi":"10.1109/PAC.1999.792190","DOIUrl":"https://doi.org/10.1109/PAC.1999.792190","url":null,"abstract":"The APS storage ring beam chamber has been storing the beam up to 100 mA successfully. However, in some beam chambers, spurious signals corrupted the BPM outputs. The cause of the unwanted signals was investigated, and it was found that transverse electric (TE) longitudinal harmonic resonances of the beam chamber were responsible. The beam chambers have small height in the area between the oval beam chamber and the antechamber. The structure behaves like a ridge waveguide so that the cut-off frequency of the waveguide mode becomes lower. The pass-band then includes the frequency around 350 MHz that is important to the beam position monitors (BPMs). The spurious harmonic resonances are damped with two types of dampers to restore the useful signals of the BPMs; coaxial loop dampers and lossy ceramic slab loading are used.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":"8 1","pages":"3092-3094 vol.5"},"PeriodicalIF":0.0,"publicationDate":"1999-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88383393","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}
J. Corlett, S. Marks, R. Rimmer, R. Schlueter, P. Bellomo, V. Bharadwaj, R. Cassel, P. Corredoura, P. Emma, R. Jobe, P. Krejcik, S. Mao, B. McKee, K. Millage, M. Munro, C. Pappas, T. Raubenheimer, S. Rokni, M. Ross, H. Schwarz, J. Sheppard, C. Spencer, R. Tighe, M. Woodley
We report progress on the design of the Next Linear Collider (NLC) damping rings complex (DRC). The purpose of the DRC is to provide 120 Hz, low emittance electron and positron bunch trains to the NLC linacs. It consists of two 1.98 GeV main damping rings, one positron pre-damping ring, two pairs of bunch length and energy compressor systems and interconnecting transport lines. The 2 main damping rings store up to 0.8 amp in 3 trains of 95 bunches each and have normalized extracted beam emittances /spl gamma//spl isin//sub x/=3 /spl mu/m-rad and /spl gamma//spl isin//sub y/=0.03 /spl mu/m-rad. The preliminary optical design, performance specifications and tolerances are given. Key subsystems include: 1) the 714 MHz RF system, 2) the 60 ns risetime injection/extraction pulsed kicker magnets, 3) the 44 m wiggler magnet system, 4) the arc and wiggler vacuum system, 5) the radiation management system, 6) the beam diagnostic instrumentation, 7) special systems used for downstream machine protection and 8) feedback-based stabilization systems.
{"title":"The Next Linear Collider damping ring complex","authors":"J. Corlett, S. Marks, R. Rimmer, R. Schlueter, P. Bellomo, V. Bharadwaj, R. Cassel, P. Corredoura, P. Emma, R. Jobe, P. Krejcik, S. Mao, B. McKee, K. Millage, M. Munro, C. Pappas, T. Raubenheimer, S. Rokni, M. Ross, H. Schwarz, J. Sheppard, C. Spencer, R. Tighe, M. Woodley","doi":"10.1109/PAC.1999.792326","DOIUrl":"https://doi.org/10.1109/PAC.1999.792326","url":null,"abstract":"We report progress on the design of the Next Linear Collider (NLC) damping rings complex (DRC). The purpose of the DRC is to provide 120 Hz, low emittance electron and positron bunch trains to the NLC linacs. It consists of two 1.98 GeV main damping rings, one positron pre-damping ring, two pairs of bunch length and energy compressor systems and interconnecting transport lines. The 2 main damping rings store up to 0.8 amp in 3 trains of 95 bunches each and have normalized extracted beam emittances /spl gamma//spl isin//sub x/=3 /spl mu/m-rad and /spl gamma//spl isin//sub y/=0.03 /spl mu/m-rad. The preliminary optical design, performance specifications and tolerances are given. Key subsystems include: 1) the 714 MHz RF system, 2) the 60 ns risetime injection/extraction pulsed kicker magnets, 3) the 44 m wiggler magnet system, 4) the arc and wiggler vacuum system, 5) the radiation management system, 6) the beam diagnostic instrumentation, 7) special systems used for downstream machine protection and 8) feedback-based stabilization systems.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":"657 1","pages":"3429-3431 vol.5"},"PeriodicalIF":0.0,"publicationDate":"1999-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77029601","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}
A position-sensitive photoconductive detector (PSPCD) using insulating-type CVD diamond as its substrate material has been developed at the Advanced Photon Source (APS). Several different configurations, including a quadrant pattern for a X-ray-transmitting beam position monitor (TBPM) and 1-D and 2-D arrays for PSPCD beam profilers, have been developed. Tests on different PSPCD devices with high-heat-flux undulator white X-ray beam, as well as with gamma-ray beams from /sup 60/Co sources have been done at the APS and National Institute of Standards and Technology (NIST). It was proven that the insulating-type CVD diamond can be used to make a hard X-ray and gamma-ray position-sensitive detector that acts as a solid-state ion chamber. These detectors are based on the photoconductivity principle. A total of eleven of these TBPMs have been installed on the APS front ends for commissioning use. The linear array PSPCD beam profiler has been routinely used for direct measurements of the undulator white beam profile. More tests with hard x-rays and gamma rays are planned for the CVD-diamond 2-D imaging PSPCD. Potential applications include a high-dose-rate beam profiler for fourth-generation synchrotron radiation facilities, such as free-electron lasers.
{"title":"CVD-diamond-based position sensitive photoconductive detector for high-flux X-rays and gamma rays","authors":"D. Shu, P. Job, J. Barraza, T. Cundiff, T. Kuzay","doi":"10.1109/PAC.1999.794382","DOIUrl":"https://doi.org/10.1109/PAC.1999.794382","url":null,"abstract":"A position-sensitive photoconductive detector (PSPCD) using insulating-type CVD diamond as its substrate material has been developed at the Advanced Photon Source (APS). Several different configurations, including a quadrant pattern for a X-ray-transmitting beam position monitor (TBPM) and 1-D and 2-D arrays for PSPCD beam profilers, have been developed. Tests on different PSPCD devices with high-heat-flux undulator white X-ray beam, as well as with gamma-ray beams from /sup 60/Co sources have been done at the APS and National Institute of Standards and Technology (NIST). It was proven that the insulating-type CVD diamond can be used to make a hard X-ray and gamma-ray position-sensitive detector that acts as a solid-state ion chamber. These detectors are based on the photoconductivity principle. A total of eleven of these TBPMs have been installed on the APS front ends for commissioning use. The linear array PSPCD beam profiler has been routinely used for direct measurements of the undulator white beam profile. More tests with hard x-rays and gamma rays are planned for the CVD-diamond 2-D imaging PSPCD. Potential applications include a high-dose-rate beam profiler for fourth-generation synchrotron radiation facilities, such as free-electron lasers.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":"46 1","pages":"2090-2092 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1999-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75689280","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}
C. Adolphsen, J. Frisch, R. Jobe, D. McCormick, W. Nelson, T. Raubenheimer, S. Rokni, M. Ross, P. Tenenbaum, D. Walz
The Next Linear Collider (NLC) electron and positron beams are capable of damaging the linac accelerating structure and beamline vacuum chambers during an individual aberrant accelerator pulse. Machine protection system (MPS) considerations, outlined in this paper for the 1 TeV NLC design, have an impact on the engineering and design of most machine components downstream of the damping ring injector complex. The MPS consists of two functional levels. The first level provides a benign, single bunch, low intensity, high emittance pilot beam that will be used for commissioning and also whenever the integrity or the settings of the downstream components are in doubt. This level also provides for the smooth transition back and forth between high power operation and the benign diagnostic pilot bunch operation. The pilot bunch parameters in the main linac are estimated on the basis of the expected stress in the accelerator structure copper. Beam tests have been done at the SLAC linac to examine the behavior of the copper at the damage stress threshold. Typical pilot beam parameters (compared with nominal) are: 10 times reduced intensity, 10 times increased horizontal emittance and 1000 times increased vertical emittance, resulting in a reduction in charge density of 10/sup 5/. The second level is the primary protection against a single aberrant pulse. Its goal is to reduce the possibility that a substantial transverse field changes the trajectory of the high power beam from one pulse to the next. All devices that could produce such a field are (1) monitored by a fast response network and where possible have (2) deliberately slowed response times. A 'maximum allowable interpulse difference' is evaluated for each such device as well as the beam trajectory monitors in each interpulse period.
下一代直线对撞机(NLC)的电子和正电子光束能够在单个异常加速器脉冲中破坏直线加速结构和束线真空室。本文为1 TeV NLC设计概述的机器保护系统(MPS)考虑因素对阻尼环喷油器综合体下游大多数机器部件的工程和设计产生了影响。MPS由两个功能级别组成。第一层提供良性、单束、低强度、高发射度的导束，用于调试，也用于下游组件的完整性或设置有疑问的时候。该级别还提供了高功率操作和良性诊断导束操作之间的平稳转换。根据加速器结构铜的预期应力，估计了主直线加速器中的导束参数。在SLAC直线加速器上进行了梁试验，以检查铜在损伤应力阈值下的行为。典型的导束参数(与标称相比)是:强度降低10倍，水平发射度增加10倍，垂直发射度增加1000倍，导致电荷密度降低10/sup 5/。第二层是对单个异常脉冲的主要保护。它的目标是减少一个巨大的横向场改变高功率光束从一个脉冲到下一个脉冲的轨迹的可能性。所有可能产生这种场的设备都(1)由快速响应网络监控，并在可能的情况下(2)故意减慢响应时间。对每个这样的设备以及每个脉冲间周期的波束轨迹监视器进行了“最大允许脉冲间差”评估。
{"title":"The Next Linear Collider machine protection system","authors":"C. Adolphsen, J. Frisch, R. Jobe, D. McCormick, W. Nelson, T. Raubenheimer, S. Rokni, M. Ross, P. Tenenbaum, D. Walz","doi":"10.1109/PAC.1999.795677","DOIUrl":"https://doi.org/10.1109/PAC.1999.795677","url":null,"abstract":"The Next Linear Collider (NLC) electron and positron beams are capable of damaging the linac accelerating structure and beamline vacuum chambers during an individual aberrant accelerator pulse. Machine protection system (MPS) considerations, outlined in this paper for the 1 TeV NLC design, have an impact on the engineering and design of most machine components downstream of the damping ring injector complex. The MPS consists of two functional levels. The first level provides a benign, single bunch, low intensity, high emittance pilot beam that will be used for commissioning and also whenever the integrity or the settings of the downstream components are in doubt. This level also provides for the smooth transition back and forth between high power operation and the benign diagnostic pilot bunch operation. The pilot bunch parameters in the main linac are estimated on the basis of the expected stress in the accelerator structure copper. Beam tests have been done at the SLAC linac to examine the behavior of the copper at the damage stress threshold. Typical pilot beam parameters (compared with nominal) are: 10 times reduced intensity, 10 times increased horizontal emittance and 1000 times increased vertical emittance, resulting in a reduction in charge density of 10/sup 5/. The second level is the primary protection against a single aberrant pulse. Its goal is to reduce the possibility that a substantial transverse field changes the trajectory of the high power beam from one pulse to the next. All devices that could produce such a field are (1) monitored by a fast response network and where possible have (2) deliberately slowed response times. A 'maximum allowable interpulse difference' is evaluated for each such device as well as the beam trajectory monitors in each interpulse period.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":"42 1","pages":"253-255 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86851680","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}
Single bunch instabilities for the 50-50 GeV muon collider are discussed. An impedance budget for the collider is estimated. An |/spl eta/|=1/spl times/10/sup -6/ is desired to avoid excessive RF systems. Potential-well distortion can be compensated by RF cavities. Longitudinal microwave growth can be reduced by smoothing the bunch distribution before injection. Transverse microwave instability can be damped by chromaticities and octupoles. Beam breakup can be cured by BNS damping in principle, but is nontrivial in practice.
{"title":"Collective instabilities of the 50-50 GeV muon collider","authors":"K. Ng","doi":"10.1109/PAC.1999.792185","DOIUrl":"https://doi.org/10.1109/PAC.1999.792185","url":null,"abstract":"Single bunch instabilities for the 50-50 GeV muon collider are discussed. An impedance budget for the collider is estimated. An |/spl eta/|=1/spl times/10/sup -6/ is desired to avoid excessive RF systems. Potential-well distortion can be compensated by RF cavities. Longitudinal microwave growth can be reduced by smoothing the bunch distribution before injection. Transverse microwave instability can be damped by chromaticities and octupoles. Beam breakup can be cured by BNS damping in principle, but is nontrivial in practice.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":"40 1","pages":"3077-3079 vol.5"},"PeriodicalIF":0.0,"publicationDate":"1999-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73784946","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}
For generation of photons above 100 keV with a magnetic field strength in the range 0.2-0.5 Tesla, an undulator wavelength /spl lambda//sub 0/ shorter than 5 mm may be needed with beam in the Advanced Photon Source (APS) storage ring. A microwave beam waveguide undulator system has been investigated for generation of such light. The waveguide structure consists of two parallel reflector surfaces that can be derived from an elliptically cylindrical waveguide. The structure can support deflecting TE/sub m0/ modes with very low microwave loss. A microwave ring resonator circuit employing the beam waveguide is considered to construct an undulator with the above requirement. Microwave properties of the beam waveguide structure have been investigated, and the design criteria for a microwave undulator are discussed.
{"title":"A microwave beam waveguide undulator for a brilliant above 100 keV photon source","authors":"Y. Kang, J. Song, R. Kustom","doi":"10.1109/PAC.1999.795654","DOIUrl":"https://doi.org/10.1109/PAC.1999.795654","url":null,"abstract":"For generation of photons above 100 keV with a magnetic field strength in the range 0.2-0.5 Tesla, an undulator wavelength /spl lambda//sub 0/ shorter than 5 mm may be needed with beam in the Advanced Photon Source (APS) storage ring. A microwave beam waveguide undulator system has been investigated for generation of such light. The waveguide structure consists of two parallel reflector surfaces that can be derived from an elliptically cylindrical waveguide. The structure can support deflecting TE/sub m0/ modes with very low microwave loss. A microwave ring resonator circuit employing the beam waveguide is considered to construct an undulator with the above requirement. Microwave properties of the beam waveguide structure have been investigated, and the design criteria for a microwave undulator are discussed.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":"7 1","pages":"168-170 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74948803","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}
Nonlinear dynamics deals with parametric resonances and diffusion, which are usually beam-intensity independent and rely on a particle Hamiltonian. Collective instabilities deal with beam coherent motion, where the Vlasov equation is frequently used in conjunction with a beam-intensity dependent Hamiltonian. We address the questions: Are the two descriptions the same? Are collective instabilities the results of encountering parametric resonances whose driving force is intensity dependent? The space-charge dominated beam governed by the Kapchinskij-Vladimirskij (KV) envelope equation is used as an example.
{"title":"Unified treatment of collective instabilities and nonlinear beam dynamics","authors":"K. Ng, S. Lee","doi":"10.1109/PAC.1999.794282","DOIUrl":"https://doi.org/10.1109/PAC.1999.794282","url":null,"abstract":"Nonlinear dynamics deals with parametric resonances and diffusion, which are usually beam-intensity independent and rely on a particle Hamiltonian. Collective instabilities deal with beam coherent motion, where the Vlasov equation is frequently used in conjunction with a beam-intensity dependent Hamiltonian. We address the questions: Are the two descriptions the same? Are collective instabilities the results of encountering parametric resonances whose driving force is intensity dependent? The space-charge dominated beam governed by the Kapchinskij-Vladimirskij (KV) envelope equation is used as an example.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":"34 1","pages":"1854-1856 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1999-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77721875","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}
M. Abo-bakr, W. Anders, K. Burkmann, V. Durr, P. Kuske, R. Muller, K. Ott, M. Scheer, E. Weihreter, G. Wustefeld, H. Winick, H. Kaiser, J. Koupsidis, M. Marx, G. Voss
An outline design is presented for a SR-source providing high brilliance VUV/soft X-rays and high flux hard X-rays based on existing hardware of the BESSY I storage ring, which will be shut down by the end of 1999. Essential features are a 6-cell double bend achromat lattice, with low beta in three of the 6 long straight sections to facilitate the use of superconducting multipole wigglers. Beam optical implications are discussed together with technical modifications of existing hardware and possible operation at 1.0 GeV. A design of a 7.5 T multipole wiggler is given.
{"title":"Extending the range of a low energy SR-source to hard X-rays","authors":"M. Abo-bakr, W. Anders, K. Burkmann, V. Durr, P. Kuske, R. Muller, K. Ott, M. Scheer, E. Weihreter, G. Wustefeld, H. Winick, H. Kaiser, J. Koupsidis, M. Marx, G. Voss","doi":"10.1109/PAC.1999.792699","DOIUrl":"https://doi.org/10.1109/PAC.1999.792699","url":null,"abstract":"An outline design is presented for a SR-source providing high brilliance VUV/soft X-rays and high flux hard X-rays based on existing hardware of the BESSY I storage ring, which will be shut down by the end of 1999. Essential features are a 6-cell double bend achromat lattice, with low beta in three of the 6 long straight sections to facilitate the use of superconducting multipole wigglers. Beam optical implications are discussed together with technical modifications of existing hardware and possible operation at 1.0 GeV. A design of a 7.5 T multipole wiggler is given.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":"79 1","pages":"2385-2387 vol.4"},"PeriodicalIF":0.0,"publicationDate":"1999-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80889887","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}
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