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SPEAR Top-Off BCS Review

SPEAR Top-Off BCS Review. Top-Off Stored Current Interlock (TOSCI). TOSCI. Function Inhibits SPEAR beam injection when stored current is less than predetermined value (e.g. 50mA). Operation

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SPEAR Top-Off BCS Review

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  1. SPEAR Top-Off BCS Review Top-Off Stored Current Interlock (TOSCI) SSRL Top-Off BCS Review February 15, 2008

  2. TOSCI Function Inhibits SPEAR beam injection when stored current is less than predetermined value (e.g. 50mA). Operation Compares current measurements (DCCT & BPMCURMON) to trip level using analog circuit. Relay de-energizes and contacts open, on fault. Schedule Manually fabricated chassis installed & tested by Feb. 22. Permanent hardware before June 16. SSRL Top-Off BCS Review February 15, 2008

  3. Block Diagram SSRL Top-Off BCS Review February 15, 2008

  4. Performance Features • Fully Redundant Measurement of DCCT and BPM Current Monitor • Hardware (BITE) & Software Testable • Response Time < 0.005 sec • Reliable, Robust, Fail-safe SSRL Top-Off BCS Review February 15, 2008

  5. TOSCI Schematic Diagram SSRL Top-Off BCS Review February 15, 2008

  6. ESD5B5.0ST1G Input Signal Conditioning SSRL Top-Off BCS Review February 15, 2008

  7. Signal Conditioner Filter Response SSRL Top-Off BCS Review February 15, 2008

  8. Limit Detector SSRL Top-Off BCS Review February 15, 2008

  9. Output Circuit SSRL Top-Off BCS Review February 15, 2008

  10. Voltage Ramp Test Generator SSRL Top-Off BCS Review February 15, 2008

  11. Error Analysis • Hysteresis <0.2 mA • Initial Offset <0.1 mA • Offset over Temp (0-70C) <0.8 mA • Noise <0.003 mA • Interference (EMI) <0.1 mA • Total Error <1.0 mA (Compare to typical trip level, e.g. 50 mA) SSRL Top-Off BCS Review February 15, 2008

  12. Reliability • MTBF > 100,000 hrs (11.4 yrs) Method: MIL-HDBK-217F N2 • Low Component Count • Overrated Components • Fail-safe: Any cable disconnected Detached power cord Power Supply failure Test Mode operation Can’t be left in Test Mode • Protected Inputs/Outputs – EMI, ESD, Reverse Voltage, Over Voltage SSRL Top-Off BCS Review February 15, 2008

  13. Test Modes • Tested every 2 weeks during recovery from machine physics, by requiring fills from below 50mA. Monitor using the Controls System. • Tested during re-certification every 12 mos. using voltage waveforms. Can be tested with or w/o beam. • Tested during SCI re-certification every 12 mos. by injected test currents. Tested without beam. SSRL Top-Off BCS Review February 15, 2008

  14. Front and Rear Panels SSRL Top-Off BCS Review February 15, 2008

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