Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)最新文献_第8页

Multipacting study of the RF window at the Advanced Photon Source 先进光子源下射频窗口的多作用研究

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-20 DOI: 10.1109/PAC.1999.795356

J.J. Song

引用次数: 2

Calculations of the self-amplified spontaneous emission performance of a free-electron laser 自由电子激光器自放大自发发射性能的计算

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-20 DOI: 10.1109/PAC.1999.792742

R. Dejus, O. Shevchenko, N. Vinokurov

引用次数: 3

Simultaneous measurement of electron beam size and divergence with an undulator 用波动器同时测量电子束大小和散度

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-20 DOI: 10.1109/PAC.1999.794406

B. Yang, A. Lumpkin

引用次数: 6

Commissioning results of the narrow-band beam position monitor system upgrade in the APS storage ring APS存储环窄带波束位置监测系统升级调试结果

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-20 DOI: 10.1109/PAC.1999.794383

O. Singh, C. Doose, J. Carwardine, G. Decker, F. Lenkszus, R. Merl

{"title":"Commissioning results of the narrow-band beam position monitor system upgrade in the APS storage ring","authors":"O. Singh, C. Doose, J. Carwardine, G. Decker, F. Lenkszus, R. Merl","doi":"10.1109/PAC.1999.794383","DOIUrl":"https://doi.org/10.1109/PAC.1999.794383","url":null,"abstract":"When using a low emittance storage ring as a high brightness synchrotron radiation source, it is critical to maintain a very high degree of orbit stability, both for the short term and for the duration of an operational fill. A fill-to-fill reproducibility is an additional important requirement. Recent developments in orbit correction algorithms have provided tools that are capable of achieving a high degree of orbit stability. However, the performance of these feedback systems can be severely limited if there are errors in the beam position monitors (BPMs). The present orbit measurement and correction system at the APS storage ring utilizes 360 broadband-type BPMs that provide turn-by-turn diagnostics and an ultra-stable orbit: <1.8 micron rms vertically and 4.5 microns rms horizontally in a frequency band of 0.017 to 30 Hz. The effects of beam intensity and bunch pattern dependency on these BPMs have been significantly reduced by employing \"offset compensation\" correction. Recently, 40 narrow-band switching-type BPMs have been installed in the APS storage ring, two in each of 20 operational insertion device straight sections, bringing the total number of beam position monitors to 400. The use of narrow-band BPM electronics is expected to reduce sensitivity to beam intensity, bunch pattern dependence, and long-term drift. These beam position monitors are used for orbit correction/feedback and machine protection interlocks for the insertion device beamlines. The commissioning results and overall performance for orbit stability are provided.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81714228","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 APS SASE FEL: modeling and code comparison APS SASE FEL:建模和代码比较

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-20 DOI: 10.1109/PAC.1999.792740

S.G. Biedrou, Y. Chae, R. Dejus, B. Faatz, H. Freund, S. Milton, H. Nuhn, S. Reiche

引用次数: 12

Numerical studies of a second harmonic RF cavity for the IPNS RCS IPNS RCS中二次谐波射频腔的数值研究

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-20 DOI: 10.1109/PAC.1999.792657

J. Dooling, F. Brumwell, G. Mcmichael, M. Middendorf, R. Zolecki

引用次数: 4

Observations of "effective" transverse beam-size instabilities for a high current per bunch fill pattern in the APS storage ring APS存储环中每束高电流填充模式的“有效”横向波束尺寸不稳定性观察

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-20 DOI: 10.1109/PAC.1999.794398

A. Lumpkin, L. Emery, B. Yang

引用次数: 2

Improved temperature regulation and corrosion protection of APS linac RF components 改进了APS直线射频元件的温度调节和腐蚀保护

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-20 DOI: 10.1109/PAC.1999.795566

M. White, R. Dortwegt, S. Pasky

引用次数: 3

Reduction of X-BPM systematic errors by modification of lattice in the APS storage ring 通过修改APS存储环中的晶格来减小X-BPM系统误差

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-20 DOI: 10.1109/PAC.1999.794369

G. Decker, O. Singh, H. Friedsam, J. Jones, M. Ramanathan, D. Shu

{"title":"Reduction of X-BPM systematic errors by modification of lattice in the APS storage ring","authors":"G. Decker, O. Singh, H. Friedsam, J. Jones, M. Ramanathan, D. Shu","doi":"10.1109/PAC.1999.794369","DOIUrl":"https://doi.org/10.1109/PAC.1999.794369","url":null,"abstract":"With recent developments, X-ray beam position monitors (BPMs) are capable of making accurate photon position measurements down to the sub-micron level. The true performance of X-ray beam position monitors when installed on insertion device beamlines is, however, severely limited due to the stray radiation traveling along the beamline that contaminates the insertion device photons. The stray radiation emanates from upstream and downstream dipole magnet fringe fields, from steering correctors, and from sextupoles and quadrupoles with offset trajectories. While significant progress has been made at the APS using look-up tables derived from translation stage scans to compensate for this effect, performance of ID X-BPMs to date is at the 10 to 20 micron level. A research effort presently underway to address this issue involves the introduction of a chicane into the accelerator lattice to steer the stray radiation away from the X-ray BPM blades. A horizontal parallel translation of the insertion device allows only ID photons and radiation from two nearby correctors to travel down the beamline, simplifying the radiation pattern considerably. A detailed ray tracing analysis has shown that stray radiation gets displaced by up to 2 cm horizontally at the X-BPM locations so that it can be easily masked. Results from such a modified lattice, implemented for one of the insertion devices, are reported here.","PeriodicalId":20453,"journal":{"name":"Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89839269","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: 7

A periodically-switched ODE model for N-bunch beamloading in a storage ring 存储环中n束束加载的周期切换ODE模型

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-20 DOI: 10.1109/PAC.1999.795452

C. Schwartz, A. Nassiri

引用次数: 0