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SSRL Top-Off BCS Review Overview: February 15, 2008

This detailed review assesses the SSRL Top-Off Beam Containment System, its design compliance with SLAC guidelines, and suggested improvements for reliability and efficiency. It covers interlocks, permits, modifications, and block diagrams.

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SSRL Top-Off BCS Review Overview: February 15, 2008

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  1. SPEAR Top Off BCS Review Overview SSRL Top-Off BCS Review February 15, 2008

  2. Purpose • Review the SSRL Top-Off BCS for the RSC. • Is the BCS design consistent with SLAC BCS guidelines and regulations? • Will the design meet the provided specifications? • Can the system be properly certified and tested in accordance with SLAC requirements? • Are there any suggested improvements that make the system more reliable, easier to test, install, fabricate or minimize the required modifications to the existing SPEAR BCS system? SSRL Top-Off BCS Review February 15, 2008

  3. Review Schedule • Overview Schmerge • Scope • Top-Off Beam Containment System • Documentation • Top-Off BCS Design Yotam • Magnet PS Interlocks Yotam • TOSCI Martin • Photon Monitors Rarback • Automated Testing Wermelskirchen • SPEAR Interface Horton • Septum Interlock • PPS SSRL Top-Off BCS Review February 15, 2008

  4. Current SPEAR Injectionvs Top-Off • Existing SPEAR BCS system requires all beamline stoppers to be closed before permitting injection • Top-Off definition is injection with beamline stoppers open • SPEAR Top-Off BCS is the additional interlocks and modifications to the existing BCS to allow injection with stoppers open SSRL Top-Off BCS Review February 15, 2008

  5. SPEAR TOP-OFF INJECTION BCS/PPS • Top-Off Stored Current Interlock (Stored Beam) 50 mA • SPEAR Energy Interlock (DESPEAR/ESPEAR) - 2.5% • BD Dipole Current Interlock ± 0.5% • BD Dipole Voltage Interlock - 1% • Injection Energy Interlock (DEinject/ESPEAR) + 10% • BTS B2-B6 Dipoles Current Interlock + 1% • BTS B3 Trim Current Interlock + 10 A • QF1 PS Interlocks (DQF/QF) • QF1 Current Interlock - 25% • QF1 Voltage Interlock - 20% • QFC PS Interlocks (DQFC/QFC) • QFC Current Interlock - 10% • QFC Voltage Interlock - 5% • Clearing Magnet PS Interlocks (DBClear/BClear) • QFC Current Interlock - 5% • QFC Voltage Interlock - 5% • Radiation Monitors Interlocks TBD • Non BCS Interlocks (Administrative) • Software power supply voltage and current monitor TBD • Software power supply resistance monitor TBD • Injection Efficiency Software Interlock TBD • Closed Orbit Interlock few mm • High Speed Fan In Chassis • SPEAR Interface • PPS Interface Chassis • Septum Interlock SSRL Top-Off BCS Review February 15, 2008

  6. Top Off BCS Permits I Existing Injection BCS • BTS Stopper Enable B9V (septum) PS Off OR Beam line stoppers closed • B9V (septum) PS Enable Beam line stoppers closed • Injection Stoppers Enable B9V (septum) PS Off Top-Off Injection BCS • BTS Stopper Enable B9V (septum) PS Off OR Beam line stoppers closed OR Top-Off injection enable • B9V (septum) PS Enable Beam line stoppers closed OR Top-Off injection enable • Injection Stoppers Enable B9V (septum) PS Off OR Top-Off injection enable SSRL Top-Off BCS Review February 15, 2008

  7. Top Off BCS Permits II • Top-Off injection enable Top-Off (SCI) OK AND SPEAR Dipole intlk OK AND QF1 magnets intlks OK AND QFC magnets intlks OK AND Clearing magnets intlks OK AND BTS B2-B6 dipoles intlk OK AND BTS B3 trim intlk OK AND Photon monitor intlks OK AND Software intlks OK AND Top-Off Permit Key OK • Linac chopper enable Top-Off injection enable OR BTS stoppers closed OR All beam line stoppers closed OR B9V (septum) PS Off OR LTB stoppers closed SSRL Top-Off BCS Review February 15, 2008

  8. New BCS Interlocks • Top-Off Stored Current Interlock • SPEAR Dipole Current and Voltage Interlock • QF1 Magnet Current and Voltage Interlock (X13) • QFC Magnet Current and Voltage Interlock (X2) • BTS B2-B6 Dipole Current Interlock • BTS B3 Trim Current Interlock • Clearing Magnet Current Interlock (X3) • Photon Monitor Interlock (X18) • Software Interlocks SSRL Top-Off BCS Review February 15, 2008

  9. Modifications • Add logic to SPEAR PPS interface chassis to allow injection with beamline stoppers open if all top-off interlocks are satisfied • Add Top-Off permit key to the SPEAR PPS interface chassis • Modify SPEAR septum interlock to permit independent operation of each set (two stoppers plus movable mask) of beamlines stoppers SSRL Top-Off BCS Review February 15, 2008

  10. Top Off BCSBlock Diagram SSRL Top-Off BCS Review February 15, 2008

  11. SPEAR Dipole Currentand Voltage Interlock • Trip if SPEAR dipole current is > 0.5% from the nominal dipole current • Trip if the SPEAR dipole power supply voltage is 1% below the nominal voltage • Redundant current monitors • Interlock also senses a single coil dipole short - a shorted dipole will produce a voltage drop of ~ 1.35% (total of 36 dipoles on the string) • Error budget < 0.1% • Remote trip test • In Top-Off mode the Dipole Interlock enables the BTS stoppers and the Linac chopper • Response time to terminate injection < 10 ms for current interlock • Response time to terminate injection < 5 s for voltage interlock SSRL Top-Off BCS Review February 15, 2008

  12. QF1 Magnet Currentand Voltage Interlock • Trip if the QF1 current is 25% below the nominal quadrupole current • Trip if the QF1 power supply voltage is 20% below the nominal voltage • Redundant current monitors • Interlock also senses a short pole - a shorted pole will produce a voltage drop of ~ 20% (because of cable resistance) • Error budget < 2.5% • Remote trip test • In Top-Off mode the QF1 magnet interlocks enables the BTS stoppers and the Linac chopper • Response time to terminate injection < 10 ms for current interlock • Response time to terminate injection < 1 s for voltage interlock SSRL Top-Off BCS Review February 15, 2008

  13. Injection EnergyInterlock • BTS B2-B6 Interlock • Trip if the dipole current is more than 1% above the nominal dipole current • Redundant current monitors • Error budget < 0.1% • Remote trip test • In Top-Off mode the BTS B2-B6 Dipoles Interlock enables the BTS stoppers and the Linac chopper • Response time to terminate injection < 10 ms • BTS B3 Trim Interlock • Trip if the power supply exceeds 10 A. • Redundant current monitors • Error budget < 10% • Remote trip test • In Top-Off mode the BTS B3 Trims Interlock enables the BTS stoppers and the Linac chopper • Response time to terminate injection < 10 ms SSRL Top-Off BCS Review February 15, 2008

  14. PS Interlocks Trip Limits SSRL Top-Off BCS Review February 15, 2008

  15. Top Off SCI • Trip if stored beam current < 50 mA • Redundant current monitors (DCCT, BPM current monitor) • Error budget < 10% • Remote trip test • In Top-Off mode the SCI enables the BTS stoppers and the Linac chopper • Response time to terminate injection < 10 ms SSRL Top-Off BCS Review February 15, 2008

  16. Radiation MonitorInterlock • One radiation monitor per beamline installed along the hutch wall adjacent to the first out of alcove beamline optic • Photon detector model 6030 from Health Physics Instruments (HPI) • Detector time constant can be chosen from 1 second to many seconds (default 5 s) • The ion chamber is connected to a remote display which provides the power to the ion chamber • Communication via RS232 or RS485 • Relay contacts available for interlock • Output integration time can be selected by user from 1-1000 s • Output including interlock relay contacts updated at 1 Hz SSRL Top-Off BCS Review February 15, 2008

  17. High SpeedFan-In Chassis • Provide for a total of 28 inputs • Provide for remote and local reset of trips • Provide for remote and local status of interlocks • Inputs • Top-Off Stored Current Interlock (SCI) • SPEAR Dipole Interlock • QF1 Magnets Interlocks (a total of 7 intlks) • QFC Magnets Interlocks (a total of 2 intlks) • Clearing Magnets Interlocks (a total of 3 intlks) • BTS B2-B6 Dipoles Interlock • BTS B3 Trim Interlock • Multiple Spare Interlock Inputs • Photon Monitor Interlock (a total of 3 summary inputs) • BTS stoppers closed status • Beam Lines closed summary • B9V (septum) PS Off status • Top-Off Permit Key • Orbit Interlock (MPS) • Outputs • Top-Off injection enable • Linac chopper enable SSRL Top-Off BCS Review February 15, 2008

  18. SPEAR PPS Interface • Inputs • Top-Off injection enable • BTS stoppers status • B9V (septum) PS on/off status • Injection stoppers closed summary • Outputs • BTS stopper enable • BTS stopper status • B9V (septum) PS on/off status • Injection stoppers closed sum status SSRL Top-Off BCS Review February 15, 2008

  19. Tentative Schedule • Mini-shutdown from June 9-June 24 to install, modify, commission and certify BCS components • Operate SPEAR with users and inject with beamlines 6, 9, 13 and 8 open from June 25 until summer shutdown • All beamlines operating in top-off for 2008 run SSRL Top-Off BCS Review February 15, 2008

  20. DocumentationNew Procedures SSRL Top-Off BCS Review February 15, 2008

  21. DocumentationDiagrams SSRL Top-Off BCS Review February 15, 2008

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