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Proceedings of International Conference on Particle Accelerators最新文献

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Advances and applications of ABCI ABCI的进展与应用
Proceedings of International Conference on Particle Accelerators Pub Date : 1993-05-17 DOI: 10.1109/PAC.1993.309668
Y. Chin
{"title":"Advances and applications of ABCI","authors":"Y. Chin","doi":"10.1109/PAC.1993.309668","DOIUrl":"https://doi.org/10.1109/PAC.1993.309668","url":null,"abstract":"ABCI (Azimuthal Beam Cavity Interaction) is a computer program which solves the Maxwell equations directly in the time domain when a Gaussian beam goes through an axi-symmetrical structure on or off axis. Many new features have been implemented in the new version of ABCI (presently version 6.6), including the \"moving mesh\" and Napoly's method of calculation of wake potentials. The mesh is now generated only for the part of the structure inside a window, and moves together with the window frame. This moving mesh option reduces the number of mesh points considerably, and very fine meshes can be used. Napoly's integration method makes it possible to compute wake potentials in a structure such as a collimator, where parts of the cavity material are at smaller radii than that of the beam pipes, in such a way that the contribution from the beam pipes vanishes. For the monopole wake potential, ABCI can be applied even to structures with unequal beam pipe radii. Furthermore, the radial mesh size can be varied over the structure, permitting to use a fine mesh only where actually needed. With these improvements, the program allows computation of wake fields for structures far too complicated for older codes. Plots of a cavity shape and wake potentials can be obtained in the form of a Top Drawer file. The program can also calculate and plot the impedance of a structure and/or the distribution of the deposited energy as a function of the frequency from Fourier transforms of wake potentials. Its usefulness is illustrated by showing some numerical examples.<<ETX>>","PeriodicalId":128308,"journal":{"name":"Proceedings of International Conference on Particle Accelerators","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116675857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Photon pulse filtering and modulation based on the extreme temporal compression and correlated energy spread of the electron bunches in the SLAC Linac Coherent Light Source (LCLS) 基于SLAC直线加速器相干光源中电子束极端时间压缩和相关能量扩散的光子脉冲滤波与调制
Proceedings of International Conference on Particle Accelerators Pub Date : 1993-05-17 DOI: 10.1109/PAC.1993.308554
R. Tatchyn
{"title":"Photon pulse filtering and modulation based on the extreme temporal compression and correlated energy spread of the electron bunches in the SLAC Linac Coherent Light Source (LCLS)","authors":"R. Tatchyn","doi":"10.1109/PAC.1993.308554","DOIUrl":"https://doi.org/10.1109/PAC.1993.308554","url":null,"abstract":"The LCLS photon pulses are expected to attain unprecedented levels of brightness and brevity in the 300-400 eV range. Nominally, the photon pulse length will be dominated by the electron bunch length, while the performance of conventional X-ray reflecting and band-shaping optics will be limited by: 1) peak power damage, and 2) transform-limited monochromatization. In this paper we describe how: 1) the correlated energy spread in the electron bunch can be used to selectably compress the LCLS photon pulses to below their nominal length; 2) gas optics can be used to mitigate peak damage problems; 3) the LCLS pulse structure can, in principle, accommodate schemes based on \"disposable\" optics; and 4) pulse lengthening schemes can be used to extend the attainable degree of monochromatization.<<ETX>>","PeriodicalId":128308,"journal":{"name":"Proceedings of International Conference on Particle Accelerators","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116727817","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
Computation of longitudinal bunched beam instability thresholds 纵向束梁失稳阈值的计算
Proceedings of International Conference on Particle Accelerators Pub Date : 1993-05-17 DOI: 10.1109/PAC.1993.309642
R. Baartman, M. Dyachkov
{"title":"Computation of longitudinal bunched beam instability thresholds","authors":"R. Baartman, M. Dyachkov","doi":"10.1109/PAC.1993.309642","DOIUrl":"https://doi.org/10.1109/PAC.1993.309642","url":null,"abstract":"An integral equation derived from the linearized Vlasov equation has been used to find the instability thresholds in the case of space-charge impedance alone for various distribution functions. It has been found that the thresholds for the instability which are caused by the coupling between m=/spl plusmn/1 azimuthal modes may be obtained analytically for many practically used distributions. Moreover, the criterion determining these thresholds appears to be the same as that for thresholds beyond which no stationary distribution can be found.<<ETX>>","PeriodicalId":128308,"journal":{"name":"Proceedings of International Conference on Particle Accelerators","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116851030","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
Status of CIAE medical cyclotron CIAE医用回旋加速器现状
Proceedings of International Conference on Particle Accelerators Pub Date : 1993-05-17 DOI: 10.1109/PAC.1993.309110
Xingzhi Zhang, Zhenguo Li, M. Fan
{"title":"Status of CIAE medical cyclotron","authors":"Xingzhi Zhang, Zhenguo Li, M. Fan","doi":"10.1109/PAC.1993.309110","DOIUrl":"https://doi.org/10.1109/PAC.1993.309110","url":null,"abstract":"A 30 MeV compact cyclotron devoted to medical radioactive isotope production is being built in CIAE. It was originally designed by IBA, Belgium. Some major modifications of the design have been taken. In order to improve the performance of the machine, magnet redesign and adjustment has to be undertaken. All equipment in the control room are already in position. RF systems, power supplies, vacuum and water cooling systems have been tested. The machine is in the final installation stage and ready for commissioning.<<ETX>>","PeriodicalId":128308,"journal":{"name":"Proceedings of International Conference on Particle Accelerators","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117008826","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
1.3 GeV electron synchrotron 1.3 GeV电子同步加速器
Proceedings of International Conference on Particle Accelerators Pub Date : 1993-05-17 DOI: 10.1109/PAC.1993.309213
J. Modéer
{"title":"1.3 GeV electron synchrotron","authors":"J. Modéer","doi":"10.1109/PAC.1993.309213","DOIUrl":"https://doi.org/10.1109/PAC.1993.309213","url":null,"abstract":"The performance of a 1.3 GeV electron booster synchrotron installed at SRRC, Hsinchu Taiwan R.O.C. is described. The system comprises a 140 keV gun, a 50 MeV linac and a 1.3 GeV 10 Hz synchrotron. The beam performance is: multibunch mode >20 mA 200 ns pulse; single bunch mode >50 mA 1.8 ns. It was commissioned in June 1992.<<ETX>>","PeriodicalId":128308,"journal":{"name":"Proceedings of International Conference on Particle Accelerators","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117032044","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
Estimation of collective effects for the EUTERPE ring EUTERPE环集体效应的估计
Proceedings of International Conference on Particle Accelerators Pub Date : 1993-05-17 DOI: 10.1109/PAC.1993.309745
Boling Xi, J. Botman, J. van Laar, C. Timmermans, H. L. Hagedoorn
{"title":"Estimation of collective effects for the EUTERPE ring","authors":"Boling Xi, J. Botman, J. van Laar, C. Timmermans, H. L. Hagedoorn","doi":"10.1109/PAC.1993.309745","DOIUrl":"https://doi.org/10.1109/PAC.1993.309745","url":null,"abstract":"In low energy storage rings with a high current, collective effects can make the real bunch length, transverse emittances and beam lifetime notably different from the ones designed on the basis of single particle dynamics. The storage ring EUTERPE is a low energy ring with a nominal beam energy of 400 MeV and with an injection energy of 75 MeV. The estimation of collective effects in this ring is reported in this paper. The dependence of several collective effects on various machine parameters, limiting effects on the bunch size and current for several optical options and possible improving measures are discussed. The results indicate that an equilibrium transverse emittance of 8.5 nm.rad with a beam current of 100 mA in a high brilliance mode is achievable, which is near the natural emittance. Collective effects have no obvious adverse effects on low energy injection in the EUTERPE ring.<<ETX>>","PeriodicalId":128308,"journal":{"name":"Proceedings of International Conference on Particle Accelerators","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129763832","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
Design, construction and testing of insertion devices for ELETTRA ELETTRA插入装置的设计、制造和测试
Proceedings of International Conference on Particle Accelerators Pub Date : 1993-05-17 DOI: 10.1109/PAC.1993.309078
R. Walker, A. Codutti, R. Bracco, B. Diviacco, D. Millo, C. Poloni, D. Zangrando
{"title":"Design, construction and testing of insertion devices for ELETTRA","authors":"R. Walker, A. Codutti, R. Bracco, B. Diviacco, D. Millo, C. Poloni, D. Zangrando","doi":"10.1109/PAC.1993.309078","DOIUrl":"https://doi.org/10.1109/PAC.1993.309078","url":null,"abstract":"The design, construction and testing of the first two undulators that will be installed in ELETTRA is described. Some details are given also of the future program of insertion device development.<<ETX>>","PeriodicalId":128308,"journal":{"name":"Proceedings of International Conference on Particle Accelerators","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129777690","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
Test results of the SSC log-ratio beam position monitor electronics SSC对数比波束位置监测电子设备的测试结果
Proceedings of International Conference on Particle Accelerators Pub Date : 1993-05-17 DOI: 10.1109/PAC.1993.309309
Roberto Aiello, M. R. Mills, R. Gonzalez
{"title":"Test results of the SSC log-ratio beam position monitor electronics","authors":"Roberto Aiello, M. R. Mills, R. Gonzalez","doi":"10.1109/PAC.1993.309309","DOIUrl":"https://doi.org/10.1109/PAC.1993.309309","url":null,"abstract":"A working prototype of beam position monitor (BPM) electronics, based on the log-ratio technique is described in this paper. Results of a test performed at the Fermilab Booster, comparing the existing Fermilab BPM system are also presented. A calibration technique has been used which corrects errors due to mismatched channels and electronics drift. The results are compared with bench measurements on the prototype circuit.<<ETX>>","PeriodicalId":128308,"journal":{"name":"Proceedings of International Conference on Particle Accelerators","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129825654","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
The high current ion source system HOLCROSS 大电流离子源系统HOLCROSS
Proceedings of International Conference on Particle Accelerators Pub Date : 1993-05-17 DOI: 10.1109/PAC.1993.309595
N. Lobanov
{"title":"The high current ion source system HOLCROSS","authors":"N. Lobanov","doi":"10.1109/PAC.1993.309595","DOIUrl":"https://doi.org/10.1109/PAC.1993.309595","url":null,"abstract":"The model HOLCROSS ion source is designed for the production of high current and brightness ion beams for application in particle accelerator injection and ion implantation. The cross type hollow cathode device in which the cross size of the cathode is greater than a longitudinal size is described. This system allows the creation of a quiet, cold and stable plasma of all cross sections. Compared with traditional hollow cathode systems this one is characterised by improved technical and operational performance. In the case of a duoplasmatron ion source the cross hollow cathode is optimised for gaseous charges such as noble gases, nitrogen, oxygen etc. A description of the source is given, together with some recent results. With a one aperture extraction system in which the square of the anode hole equals 0.25 mm/sup 2/ this source will produce more than 15 mA H/sub 1sup +/ at 8 keV and 200 mA discharge current.<<ETX>>","PeriodicalId":128308,"journal":{"name":"Proceedings of International Conference on Particle Accelerators","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128537576","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
Self-modulated-laser wakefield acceleration 自调制激光尾流场加速
Proceedings of International Conference on Particle Accelerators Pub Date : 1993-05-17 DOI: 10.1109/PAC.1993.309409
J. Krall, A. Ting, E. Esarey, P. Sprangle
{"title":"Self-modulated-laser wakefield acceleration","authors":"J. Krall, A. Ting, E. Esarey, P. Sprangle","doi":"10.1109/PAC.1993.309409","DOIUrl":"https://doi.org/10.1109/PAC.1993.309409","url":null,"abstract":"A new configuration of the laser wakefield accelerator is proposed in which enhanced acceleration is achieved via resonant self-modulation of the laser pulse. This requires laser power in excess of the critical power for relativistic guiding and a plasma wavelength short compared to the laser pulse-length. Relativistic and density wake effects strongly modulate the laser pulse at the plasma wavelength, resonantly exciting the plasma wave and leading to enhanced acceleration.<<ETX>>","PeriodicalId":128308,"journal":{"name":"Proceedings of International Conference on Particle Accelerators","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128245443","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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