Real-Time Orbit Feedback at the APS
نویسندگان
چکیده
A real-time orbit feedback system has been implemented at the Advanced Photon Source in order to meet the stringent orbit stability requirements. The system reduces global orbit motion below 30 Hz by a factor of four to below 5 l.trn rms horizontally and 2 pm rms vertically. This paper focuses on dynamic orbit stability and describes the all-digital orbit feedback system that has been implemented at the APS. Implementation of the global orbit feedback system is described and its latest performance is presented. Ultimately, the system will provide local feedback at each x-ray source point using installed photon BPMs to measure x-ray beam position and angle directly. Technical challenges associated with local feedback and with dynamics of the associated corrector magnets are described. The unique diagnostic capabilities provided by the APS system are discussed with reference to their use in identifying sources of the underlying orbit motion.
منابع مشابه
Architecture of the APS Real-Time Orbit Feedback System
The APS Real-Time Orbit Feedback System is designed to stabilize the orbit of the stored positron beam against low-frequency sources such as mechanical vibration and power supply ripple. A distributed array of digital signal processors is used to measure the orbit and compute corrections at a 1kHz rate. The system also provides extensive beam diagnostic tools. This paper describes the architect...
متن کاملModeling Transverse Orbit Feedback Control
There are two objectives to this report. The first is to present a model, or mathematical representation, of transverse orbit feedback control in general. The second objective is to utilize this model as an analysis tool for the APS real-time feedback system (RTFS). A most important example is that the model quantitatively predicts the effect of adding more correctors to the RTFS. This and othe...
متن کاملCommissioning of the APS Real-Time Orbit Feedback System
A unified global and local closed-orbit feedback system has been implemented at the Advanced Photon Source in order to stabilize both particle and photon beams. Beam stability requirements in the band up to 50Hz are 17μm in the horizontal plane and 4.4μm vertically. Orbit feedback algorithms are implemented digitally using multiple digital signal processors, with computing power distributed in ...
متن کاملCommissioning Results of the Narrow-band Beam Position Monitor System Upgrade in the Aps Storage Ring
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...
متن کاملOrbit Feedback Using X-ray Beam Position Monitoring at the Advanced Photon Source
The Advanced Photon Source (APS) was commissioned in 1995 as a third-generation x-ray user facility. At that time orbit control was performed exclusively with broadband rf beam position monitors (BPMs). Since then, emphasis has been placed on incorporating x-ray beam position monitors into the orbit control algorithms. This has resulted in an order of magnitude improvement in long-term beam sta...
متن کامل