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Power Supply Control at NSLS-II

Power Supply Control at NSLS-II. Yuke Tian Control Group, NSLS-II, BNL (May 1, 2009 EPICS Collaboration Meeting, Vancouver). Outline. Power supply control in accelerator 2. NSLS-II power supply control system Synchronism, deterministic and reliability in NSLS-II power supply control

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Power Supply Control at NSLS-II

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  1. Power Supply Control at NSLS-II Yuke Tian Control Group, NSLS-II, BNL (May 1, 2009 EPICS Collaboration Meeting, Vancouver)

  2. Outline • Power supply control in accelerator • 2. NSLS-II power supply control system • Synchronism, deterministic and reliability in NSLS-II power supply control • Summary EPICS Collaboration Meeting, Vancouver 2009

  3. Power supply control in accelerator: magnets at NSLS-II EPICS Collaboration Meeting, Vancouver 2009

  4. Power supply control in accelerator • Power supply system functions  Establish particle orbit  Orbit correction  Beam-based alignment  Tune adjustment  Cure of chromaticity  Response matrix measurement  Power supply analysis • Power supply system performance requirements and NSLS-II solutions  Reliability: power supply causes most of the failure time 1) Failures caused by harsh environments: moisture, dust, temperature etc. 2) Power supply control system failure: communication, IC parts failure etc.  Synchronization: power supply system needs to be synchronous with other accelerator subsystems to perform various functions. Usually the synchronization is done through timing system. NSLS-II solutions: temperature controlled racks. NSLS-II solutions: redundant SDI links; Built-in diagnostic functions. NSLS-II solutions: fully synchronous system including BPMs, cell controllers and power supply controllers. EPICS Collaboration Meeting, Vancouver 2009

  5. Power Supply Control at NSLS-II: overview Events/ / Timing Data Fast Orbit Feedback Synchronous Bus Ethernet – EPICS Channel Access Protocol PS control For one cell Cell Controller CPU RFBPM 1 FC1 RFBPM 2 FC2 DCPS 01 FC3 DCPS 02 RFBPM 8 SC1 XRay BPM1 DCPS 39 SC2 XRay BPM2 DC Power Supply Controllers For Multipole Magnets XRay BPM4 SC6 XRay BPM4 Correctors EPICS Collaboration Meeting, Vancouver 2009

  6. Power Supply Control at NSLS-II: overview NSLS-II Power Supply Control System EPICS Collaboration Meeting, Vancouver 2009

  7. NSLS-II Power Supply Control System: Cell Controller Detailed Structure of Cell Controller EPICS Collaboration Meeting, Vancouver 2009

  8. NSLS-II Power Supply Control System: PSC, PSI, Regulator Power Supply Control System EPICS Collaboration Meeting, Vancouver 2009

  9. NSLS-II Power Supply Control System: PSC Power Supply Controller (PSC) EPICS Collaboration Meeting, Vancouver 2009

  10. NSLS-II Power Supply Control System: PSI Power Supply Interface (PSI) EPICS Collaboration Meeting, Vancouver 2009

  11. NSLS-II Power Supply Control System: Regulator Current Regulator Module EPICS Collaboration Meeting, Vancouver 2009

  12. Synchronism, Deterministic and Reliability in NSLS-II power supply control Clock Domains In Accelerators EPICS Collaboration Meeting, Vancouver 2009

  13. Synchronism, deterministic and reliability in NSLS-II power supply control • Synchronism in NSLS-II  125MHz clock (in sync with master oscillator) and fiducia will be distributed. We already have a very fine, low jitter clock. We can synchronize all circuit with this RF clock. We can timestamp every event with 8ns resolution. All the systems are talking with the same clock.  Traditional power supply control system receive a trigger pulse from timing system and use local oscillators to drive the DAC, ADC etc. NSLS-II solutions: pushing synchronism to power supply control. The DAC, ADC and FPGA are synchronous with RF main oscillator. The local oscillators are for back up in case the RF main oscillator is not available. EPICS Collaboration Meeting, Vancouver 2009

  14. Synchronism, deterministic and reliability in NSLS-II power supply control Pushing Synchronism to Power Supply Control at NSLS-II EPICS Collaboration Meeting, Vancouver 2009

  15. Synchronism, deterministic and reliability in NSLS-II power supply control Latency of Power Supply SDI Link EPICS Collaboration Meeting, Vancouver 2009

  16. Summary • At NSLS-II, power supplies and the power supply control systems are designed with goals of high reliability, easy for diagnostics, and easy for integration. • At NSLS-II, we are design a open source communication interface for power supply control system. It offers more advantages than other communications interface such as RS232, RS485, CAN etc. • At NSLS-II, we are pushing synchronism to power supply control level. So, all the subsystems (BPM, PS, LLRF etc) are all synchronized, many accelerator applications can benefit from this synchronism.  Fast orbit feedback system 1) Synchronous distribution of BPM data (by SDI between cells) 2) Matrix math and regulation (done with the same clock) 3) Corrector PS actions (by SDI between PS controller)  Response matrix measurement: 1) Synchronous kick one or more magnets (by SDI between PS controller) 2) Synchronous measurement of the BPM data (by GigE interface)  Other applications: tune measurements, synchronous PS ramping etc. EPICS Collaboration Meeting, Vancouver 2009

  17. Acknowledgement Wing Louie (BNL) John Ricciardelli (BNL) George Ganetis (BNL) Larry Doolittle (LBNL) Bob Dalesio (BNL) Carlos Serrano (LBNL) Thank you ! EPICS Collaboration Meeting, Vancouver 2009

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