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SPEAR Top Off BCS Review

SPEAR Top Off BCS Review. Overview. 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?

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SPEAR Top Off BCS Review

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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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