4. Measure position at each BPM on each turn ( 3.6 mi-This paper describes the Beam Position Monitor (BPM)croseconds for the storage ring). data acquisition scheme for the Advanced Photon Source 5. Provide averaged beam position for higher accuracy.(APS) storage ring. The storage ring contains 360 beam posi-6. Provide a beam history for each BPM.
Tokamak diagnostic settings are repeatedly modified to meet the changing needs of each experiment. Enabling the remote diagnostic control has significant challenges due to security and efficiency requirements. The Operation Request Gatekeeper (ORG) is a software system that addresses the challenges of remotely but securely submitting modification requests. The ORG provides a framework for screening all the requests before they enter the secure machine zone and are executed by performing user authentication and authorization, grammar validation, and validity checks. A prototype ORG was developed for the ITER CODAC that satisfies their initial requirements for remote request submission and has been tested with remote control of the KSTAR Plasma Control System. This paper describes the software design principles and implementation of ORG as well as worldwide test results.
The fourth-integral betatron resonance driven by sextupoles was studied on the electron storage ring Aladdin at SRC. The resonance feature of capturing the phase space particles in the resonance islands was clearly demonstrated. In a computer simulation, the finite beam size is simulated by multi-particle tracking and the decoherence of the betatron oscillation was shown to agree well with experiment observation.
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