Injector power supplies reliability improvements at the Advanced Photon Source.
Operational goals for the Advanced Photon Source (APS) facility include 97% availability and a mean time between unscheduled beam losses (faults) of 70 hours, with more than 5000 user hours of scheduled beam per year. To meet this objective, our focus has been maximizing the mean time between faults (MTBF). We have made various hardware and software improvements to better operate and monitor the injector power supply systems. These improvements have been challenging to design and implement in light of the facility operating requirements but are critical to maintaining maximum reliability and availability of beam for user operations. This paper presents actions taken as well as future plans to continue improving injector power supply hardware and software to meet APS user operation goals. The Advanced Photon Source (APS) has two major components. The storage ring (SR) accelerator is the primary accelerator that delivers X-ray beams to users and uses over 1,400 power supplies. The injector accelerators provide beam to the SR and use 361 different supplies. The control system ranges from the standard VME-IOC and Allen Bradley to GESPAC with additional mini-PLCs for monitoring. Injector power supplies range from {approx}30 watts DC to a ramped peak of 4.6 megawatts in 250 ms. Finally, all accelerators use pulsed supplies, and some of them deliver peak power in megawatts. In the SR, each multipole and corrector magnet is separately powered, with only the main dipole magnets on a common bus. Independent power supplies provide increased flexibility, but place additional demands on power supply reliability. The APS reliability goals are 97% availability and 70 hours mean time to unscheduled beam loss. There are 5,129 user hours scheduled per year, 1,315 hours used for machine studies, and the remaining 2,316 hours used for maintenance. The present annual operating schedule provides for three user runs (typically 10 to 12 weeks long), and three machine shutdowns (typically 3 to 5 weeks long). There is one 48-hour period, one 16-hour period, and one 8-hour period of machine studies/intervention for every three weeks of user operation. Reliability goals for the magnet power supply systems are 99.1% availability, with a mean time between beam losses of 240 hours. This goal translates to a required mean time between power-supply-related beam trips during top-up operations (MTBF) of better than 422,640 hours for each magnet power supply. The failure of any SR magnet power supply can cause loss of beam or, in the injector, prohibit top-up operation.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 972568
- Report Number(s):
- ANL/ASD/CP-114994; TRN: US1001615
- Resource Relation:
- Conference: 2005 Particle Accelerator Conference (PAC2005); May 16, 2005 - May 20, 2005; Knoxville, TN
- Country of Publication:
- United States
- Language:
- ENGLISH
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