Pub Date : 2007-06-25DOI: 10.1109/PAC.2007.4441083
T. Shaftan, J. Rose, I. Pinayev, R. Heese, J. Bengtsson, J. Skaritka, W. Meng, S. Ozaki, R. Meier, C. Stelmach, V. Litvinenko, S. Pjerov, S. Sharma, G. Ganetis, H. Hseuh, E. D. Johnson, N. Tsoupas, W. Guo, J. Beebe-Wang, A. Luccio, L. Yu, D. Raparia, D. Wang
We present the conceptual design of the NSLS-II injection system [1, 2]. The injection system consists of a low-energy linac, booster and transport lines. We review two different injection system configurations; a booster located in the storage ring tunnel and a booster housed in a separate building. We briefly discuss main parameters and layout of the injection system components.
{"title":"Conceptual design of the NSLS-II injection system","authors":"T. Shaftan, J. Rose, I. Pinayev, R. Heese, J. Bengtsson, J. Skaritka, W. Meng, S. Ozaki, R. Meier, C. Stelmach, V. Litvinenko, S. Pjerov, S. Sharma, G. Ganetis, H. Hseuh, E. D. Johnson, N. Tsoupas, W. Guo, J. Beebe-Wang, A. Luccio, L. Yu, D. Raparia, D. Wang","doi":"10.1109/PAC.2007.4441083","DOIUrl":"https://doi.org/10.1109/PAC.2007.4441083","url":null,"abstract":"We present the conceptual design of the NSLS-II injection system [1, 2]. The injection system consists of a low-energy linac, booster and transport lines. We review two different injection system configurations; a booster located in the storage ring tunnel and a booster housed in a separate building. We briefly discuss main parameters and layout of the injection system components.","PeriodicalId":446026,"journal":{"name":"2007 IEEE Particle Accelerator Conference (PAC)","volume":"07 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127222020","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}
Pub Date : 2007-06-25DOI: 10.1109/PAC.2007.4441326
A. Burov, V. Lebedev
The more beam is cooled, the less stable it is. In the 3.3 km Recycler Ring, stacked 8 GeV antiprotons are cooled both with stochastic (transversely) and electron (3D) cooling. Since the machine is staying near the coupling resonance, coupled optical functions should be used for stability analysis. To stabilize beam against the resistive wall instability, a digital damper is used. Digital dampers can be described as linear operators with explicit time dependence, and that makes a principle difference with analogous dampers. Theoretical description of the digital dampers is presented. Electron cooling makes possible a two-beam instability of the cooled beam with the electron beam. Special features of this instability are described, and the remedy is discussed.
{"title":"Instabilities of cooled antiproton beam in recycler","authors":"A. Burov, V. Lebedev","doi":"10.1109/PAC.2007.4441326","DOIUrl":"https://doi.org/10.1109/PAC.2007.4441326","url":null,"abstract":"The more beam is cooled, the less stable it is. In the 3.3 km Recycler Ring, stacked 8 GeV antiprotons are cooled both with stochastic (transversely) and electron (3D) cooling. Since the machine is staying near the coupling resonance, coupled optical functions should be used for stability analysis. To stabilize beam against the resistive wall instability, a digital damper is used. Digital dampers can be described as linear operators with explicit time dependence, and that makes a principle difference with analogous dampers. Theoretical description of the digital dampers is presented. Electron cooling makes possible a two-beam instability of the cooled beam with the electron beam. Special features of this instability are described, and the remedy is discussed.","PeriodicalId":446026,"journal":{"name":"2007 IEEE Particle Accelerator Conference (PAC)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127434484","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}
Pub Date : 2007-06-25DOI: 10.1109/PAC.2007.4441333
K. Gollwitzer
The Fermilab tevatron collider run II program continues at the energy and luminosity frontier of high energy particle physics. To the collider experiments CDF and DO, over 3 fb-1 of integrated luminosity has been delivered to each. Upgrades and improvements in the Antiproton Source of the production and collection of antiprotons have led to increased number of particles stored in the recycler. Electron cooling and associated improvements have help make a brighter antiproton beam at collisions. Tevatron improvements to handle the increased number of particles and the beam lifetimes have resulted in an increase in luminosity.
{"title":"Run II luminosity progress","authors":"K. Gollwitzer","doi":"10.1109/PAC.2007.4441333","DOIUrl":"https://doi.org/10.1109/PAC.2007.4441333","url":null,"abstract":"The Fermilab tevatron collider run II program continues at the energy and luminosity frontier of high energy particle physics. To the collider experiments CDF and DO, over 3 fb-1 of integrated luminosity has been delivered to each. Upgrades and improvements in the Antiproton Source of the production and collection of antiprotons have led to increased number of particles stored in the recycler. Electron cooling and associated improvements have help make a brighter antiproton beam at collisions. Tevatron improvements to handle the increased number of particles and the beam lifetimes have resulted in an increase in luminosity.","PeriodicalId":446026,"journal":{"name":"2007 IEEE Particle Accelerator Conference (PAC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124942698","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}
Pub Date : 2007-06-25DOI: 10.1109/PAC.2007.4441259
M. Prokop, Sungil Kwon, P. Torrez, S. Ruggles
The Los Alamos Neutron Science Center (LANSCE) proton accelerator is scheduled for refurbishment. A new low level radio frequency (LLRF) system is part of the refurbishment plan since the existing LLRF system is analog-based and requires significant setup and maintenance time. Both field and resonance control aspects of the current system do not have the flexibility to meet future performance requirements. The LANSCE accelerator provides both H+ and H- beams and due to the various user requirements there are a number of different beam pulse types varying in timing and current. In order to meet user needs,LANSCE must simultaneously transport both H+ and H" in the accelerator. These requirements have motivated the development of a new LLRF system based on software defined radio technology. The new system will include field control using feedback and adaptive feed forward techniques, an upgraded resonance controller with frequency agility to improve startup and fault recovery times and a high power amplifier pre-compensation controller for improved cavity fill times and amplifier efficiency. Among the challenges with implementing the new system are interfacing with existing subsystems of the accelerator.
{"title":"Lansce-R low level RF control system","authors":"M. Prokop, Sungil Kwon, P. Torrez, S. Ruggles","doi":"10.1109/PAC.2007.4441259","DOIUrl":"https://doi.org/10.1109/PAC.2007.4441259","url":null,"abstract":"The Los Alamos Neutron Science Center (LANSCE) proton accelerator is scheduled for refurbishment. A new low level radio frequency (LLRF) system is part of the refurbishment plan since the existing LLRF system is analog-based and requires significant setup and maintenance time. Both field and resonance control aspects of the current system do not have the flexibility to meet future performance requirements. The LANSCE accelerator provides both H+ and H- beams and due to the various user requirements there are a number of different beam pulse types varying in timing and current. In order to meet user needs,LANSCE must simultaneously transport both H+ and H\" in the accelerator. These requirements have motivated the development of a new LLRF system based on software defined radio technology. The new system will include field control using feedback and adaptive feed forward techniques, an upgraded resonance controller with frequency agility to improve startup and fault recovery times and a high power amplifier pre-compensation controller for improved cavity fill times and amplifier efficiency. Among the challenges with implementing the new system are interfacing with existing subsystems of the accelerator.","PeriodicalId":446026,"journal":{"name":"2007 IEEE Particle Accelerator Conference (PAC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125132476","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}
Pub Date : 2007-06-25DOI: 10.1109/PAC.2007.4440302
A. Grassellino, J. Keung, M. Newcomer, N. Lockyer
This paper presents a FPGA based Real Time Simulator of ILC superconducting RF cavities. The system has been developed on a Lyrtech VHS-ADAC board, through the use of Xilinx System Generator and Simulink. This FPGA system is mainly being developed for allowing testing of the LLRF systems in the real time and for different cavities parameters.
提出了一种基于FPGA的ILC超导射频腔实时仿真器。该系统是在Lyrtech VHS-ADAC板上开发的，使用了Xilinx system Generator和Simulink。该FPGA系统主要用于允许对LLRF系统进行实时测试和不同空腔参数的测试。
{"title":"FPGA based ILC cavity simulator","authors":"A. Grassellino, J. Keung, M. Newcomer, N. Lockyer","doi":"10.1109/PAC.2007.4440302","DOIUrl":"https://doi.org/10.1109/PAC.2007.4440302","url":null,"abstract":"This paper presents a FPGA based Real Time Simulator of ILC superconducting RF cavities. The system has been developed on a Lyrtech VHS-ADAC board, through the use of Xilinx System Generator and Simulink. This FPGA system is mainly being developed for allowing testing of the LLRF systems in the real time and for different cavities parameters.","PeriodicalId":446026,"journal":{"name":"2007 IEEE Particle Accelerator Conference (PAC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125176181","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}
Pub Date : 2007-06-25DOI: 10.1109/PAC.2007.4439951
T. Dixit, Y. Shimosaki, K. Takayama
It was observed that a bunch-length shrunk with acceleration in the Induction Synchrotron (IS) experiment, where a single proton-bunch injected from the 500 MeV Booster was accelerated to 6 GeV in the KEK-PS. A novel technique capable of quantitatively predicting the adiabatic phenomenon of bunch shortening has been developed, based on a hypothesis that the particle oscillation amplitude varies inversely proportional to the square root of its oscillation frequency. The experimental result and analytical prediction is in good agreement with each other.
{"title":"Adiabatic damping during acceleration in the Induction Synchrotron","authors":"T. Dixit, Y. Shimosaki, K. Takayama","doi":"10.1109/PAC.2007.4439951","DOIUrl":"https://doi.org/10.1109/PAC.2007.4439951","url":null,"abstract":"It was observed that a bunch-length shrunk with acceleration in the Induction Synchrotron (IS) experiment, where a single proton-bunch injected from the 500 MeV Booster was accelerated to 6 GeV in the KEK-PS. A novel technique capable of quantitatively predicting the adiabatic phenomenon of bunch shortening has been developed, based on a hypothesis that the particle oscillation amplitude varies inversely proportional to the square root of its oscillation frequency. The experimental result and analytical prediction is in good agreement with each other.","PeriodicalId":446026,"journal":{"name":"2007 IEEE Particle Accelerator Conference (PAC)","volume":"447 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125769319","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}
Pub Date : 2007-06-25DOI: 10.1109/PAC.2007.4439928
F. Rizzato, R. Pakter, Y. Levin, R. Nunes
We analyze the dynamics of inhomogeneous, magnetically focused high-intensity beams of charged particles. While for homogeneous beams the whole system oscillates with a single frequency, any inhomogeneity leads to propagating transverse density waves which eventually result in a singular density build up, causing wave breaking and jet formation. The theory presented in this paper allows to analytically calculate the time at which the wave breaking takes place. It also gives a good estimate of the time necessary for the beam to relax into the final stationary state consisting of a cold core surrounded by a halo of highly energetic particles.
{"title":"Wave breaking and particle jets in inhomogeneous beams","authors":"F. Rizzato, R. Pakter, Y. Levin, R. Nunes","doi":"10.1109/PAC.2007.4439928","DOIUrl":"https://doi.org/10.1109/PAC.2007.4439928","url":null,"abstract":"We analyze the dynamics of inhomogeneous, magnetically focused high-intensity beams of charged particles. While for homogeneous beams the whole system oscillates with a single frequency, any inhomogeneity leads to propagating transverse density waves which eventually result in a singular density build up, causing wave breaking and jet formation. The theory presented in this paper allows to analytically calculate the time at which the wave breaking takes place. It also gives a good estimate of the time necessary for the beam to relax into the final stationary state consisting of a cold core surrounded by a halo of highly energetic particles.","PeriodicalId":446026,"journal":{"name":"2007 IEEE Particle Accelerator Conference (PAC)","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126024529","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}
Pub Date : 2007-06-25DOI: 10.1109/PAC.2007.4440331
T. Shintake
Three major X-ray FELs are now under construction: LCLS[1] at SLAC Stanford, XFEL/SPring-8[2] in Japan and Euro-XFEL[3] at DESY Hamburg. They are all aiming at generating 1 A wavelength coherent X-ray radiation, which possess special feature: very high peak power and short pulse length. It will provide powerful tool to study non-linear dynamics of condensed matter, multi-photon ionization process of gases, and also it will realize the X-ray microscope of Angstrom resolving power, and instantaneous photography of femto-second time slicing capability. All of those XFELs rely on the same principle of SASE: Self-Amplified Spontaneous Emission, which does not require the cavity mirrors, thus wavelength is widely tuneable. This paper reviews basic configuration of each machine and project status.
{"title":"Review of the worldwide SASE FEL development","authors":"T. Shintake","doi":"10.1109/PAC.2007.4440331","DOIUrl":"https://doi.org/10.1109/PAC.2007.4440331","url":null,"abstract":"Three major X-ray FELs are now under construction: LCLS[1] at SLAC Stanford, XFEL/SPring-8[2] in Japan and Euro-XFEL[3] at DESY Hamburg. They are all aiming at generating 1 A wavelength coherent X-ray radiation, which possess special feature: very high peak power and short pulse length. It will provide powerful tool to study non-linear dynamics of condensed matter, multi-photon ionization process of gases, and also it will realize the X-ray microscope of Angstrom resolving power, and instantaneous photography of femto-second time slicing capability. All of those XFELs rely on the same principle of SASE: Self-Amplified Spontaneous Emission, which does not require the cavity mirrors, thus wavelength is widely tuneable. This paper reviews basic configuration of each machine and project status.","PeriodicalId":446026,"journal":{"name":"2007 IEEE Particle Accelerator Conference (PAC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126051300","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}
Pub Date : 2007-06-25DOI: 10.1109/PAC.2007.4441047
G. Andonian, R. Agustsson, A. Cook, M. Dunning, E. Hemsing, A. Murokh, S. Reiche, J. Rosenzweig, M. Babzien, K. Kusche, R. Malone, V. Yakimenko
The radiation emitted from a chicane compressor has been studied at the Brookhaven national laboratory (BNL) accelerator test facility (ATF). Coherent edge radiation (CER) is emitted from a compressed electron beam as it traverses sharp edge regions of a magnet. The compression is accompanied by strong self-fields, which are manifested as distortions in the momentum space called beam bifurcation. Recent measurements indicate that the bunch length is approximately 150 fs rms. The emitted THz chicane radiation displays strong signatures of CER. This paper reports on the experimental characterization and subsequent analysis of the chicane radiation measurements at the BNL ATF with a discussion of diagnostics development and implementation. The characterization includes spectral analysis, far-field intensity distribution, and polarization effects. Experimental data is benchmarked to a custom developed start-to-end simulation suite.
{"title":"Chicane radiation measurements with a compressed electron beam at the BNL ATF","authors":"G. Andonian, R. Agustsson, A. Cook, M. Dunning, E. Hemsing, A. Murokh, S. Reiche, J. Rosenzweig, M. Babzien, K. Kusche, R. Malone, V. Yakimenko","doi":"10.1109/PAC.2007.4441047","DOIUrl":"https://doi.org/10.1109/PAC.2007.4441047","url":null,"abstract":"The radiation emitted from a chicane compressor has been studied at the Brookhaven national laboratory (BNL) accelerator test facility (ATF). Coherent edge radiation (CER) is emitted from a compressed electron beam as it traverses sharp edge regions of a magnet. The compression is accompanied by strong self-fields, which are manifested as distortions in the momentum space called beam bifurcation. Recent measurements indicate that the bunch length is approximately 150 fs rms. The emitted THz chicane radiation displays strong signatures of CER. This paper reports on the experimental characterization and subsequent analysis of the chicane radiation measurements at the BNL ATF with a discussion of diagnostics development and implementation. The characterization includes spectral analysis, far-field intensity distribution, and polarization effects. Experimental data is benchmarked to a custom developed start-to-end simulation suite.","PeriodicalId":446026,"journal":{"name":"2007 IEEE Particle Accelerator Conference (PAC)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126121057","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}
Pub Date : 2007-06-25DOI: 10.1109/PAC.2007.4440124
C. Joshi
In recent months plasma accelerators have set new records: The first laser wakefield accelerator (LWFA) to demonstrate a GeV electron beam with a significant charge and good beam quality in a "table-top" device at Lawrence Berkeley national laboratory (LBNL) [1], and the energy doubling of 42 GeV electrons from the SLAC linac in a meter-scale plasma wakefield accelerator (PWFA) by the UCLA, USC, SLAC collaboration known as E167 [2]. These two events happening at two different laboratories represent a very significant advance of the field to be sure, but there have been many other extremely important advances for the field of plasma-accelerators that deserve special recognition. In this paper after reviewing these two major acceleration results, I focus on these latter advances and speculate how the field is likely to develop in the next few years.
{"title":"Plasma accelerators-progress and the future","authors":"C. Joshi","doi":"10.1109/PAC.2007.4440124","DOIUrl":"https://doi.org/10.1109/PAC.2007.4440124","url":null,"abstract":"In recent months plasma accelerators have set new records: The first laser wakefield accelerator (LWFA) to demonstrate a GeV electron beam with a significant charge and good beam quality in a \"table-top\" device at Lawrence Berkeley national laboratory (LBNL) [1], and the energy doubling of 42 GeV electrons from the SLAC linac in a meter-scale plasma wakefield accelerator (PWFA) by the UCLA, USC, SLAC collaboration known as E167 [2]. These two events happening at two different laboratories represent a very significant advance of the field to be sure, but there have been many other extremely important advances for the field of plasma-accelerators that deserve special recognition. In this paper after reviewing these two major acceleration results, I focus on these latter advances and speculate how the field is likely to develop in the next few years.","PeriodicalId":446026,"journal":{"name":"2007 IEEE Particle Accelerator Conference (PAC)","volume":"347 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123529566","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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