1. New Radiation Safety Interlock System for the SPring-8 Accelerator Complex C. Saji, M. Toko, T. Matsushita, R. Furuta, H. Hanaki, S. Hashimoto 1), Y. Hashimoto, M. Kago, K. Kawata, T. Masuda, S. Miyamoto 1), T. Nagaoka, N. Nariyama, H. Ohkuma, S. Sasaki, K. Soutome, S. Suzuki, M. Takao, R. Tanaka, Y. Tsuzuki, A. Yamashita, H. Yonehara Japan Synchrotron Radiation Research Institute (JASRI/SPring-8) 1) Laboratory of Advanced Science and Technology for Industry (LASTI/U. of Hyogo) 12 Apr. 2011 The 3 rd Accelerator Reliability Workshop e-mail: saji@spring8.or.jp

2. C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex2 Education: PhD, graduated in 2002. Experience: From 1998 to 2007, I belonged to an elementary particle physics experiment which was not an accelerator experiment. Major work was detection/analysis of neutrinos induced by cosmic-ray interaction. I started accelerator related work in 2007. So the experience of accelerator related work is recent 4 years. Now I'm managing the radiation safety interlock system for the SPring-8 accelerator.

3. Outline C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 3 Introduction Motivation New radiation safety interlock system Summary & Future

4. Introduction C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 4 Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L3 beam-transport (L3) NewSUBARU storage ring (NS) ©RIKEN/JASRI SPring-8 Accelerator complex Electron accelerator Light source facility

5. Introduction C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 5 Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L3 beam-transport (L3) NewSUBARU storage ring (NS) ©RIKEN/JASRI Linac: Include electron GUN Up to 1GeV SPring-8 Accelerator complex

6. Introduction C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 6 Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L3 beam-transport (L3) NewSUBARU storage ring (NS) ©RIKEN/JASRI SPring-8 Accelerator complex Synchrotron Booster: Up to 8GeV

7. Introduction C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 7 Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L3 beam-transport (L3) NewSUBARU storage ring (NS) SPring-8 Accelerator complex ©RIKEN/JASRI 8GeV Storage ring

8. Introduction C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 8 Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L3 beam-transport (L3) NewSUBARU storage ring (NS) ©RIKEN/JASRI SPring-8 Accelerator complex L3 beam transport line: Other beam destination

9. Introduction C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 9 Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L3 beam-transport (L3) NewSUBARU storage ring (NS) ©RIKEN/JASRI SPring-8 Accelerator complex NewSUBARU: Another Storage ring (Low energy)

10. Accelerator Radiation Safety Interlock System C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 10 Purpose: Protect persons from radiation hazard induced by electron beams and synchrotron radiation Basic Function: Access control: Manage permission for entering radiation-controlled areas Monitoring safety equipment: Radiation monitor etc.. Manage permission for GUN and RF Strongly depend on the SPring-8 operation

11. Accelerator operation C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex -Five access controlled areas: Linac (Li) Synchrotron Booster (Sy) Storage Ring (SR) L3 beam-transport (L3) NewSUBARU storage ring (NS) -Beam generation/acceleration: -One electron gun generates electron beam(GUN) -Electron beam is accelerated by RF cavity (RF). -Four RFs Gun/RF SR L3 NS Sy Beam shutter SPring-8 Accelerator complex      Beam pipe Li GUN RF           - One electron GUN supplies electron beam to all area Combination of areas  Many kinds of operations Switching Magnet

12. Various Accelerator Operations C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 12 -Beam transportation route:  Switching Magnets SR injection operation mode SR L3 NS Sy SPring-8 Accelerator Complex      Li      Switching Magnet on off

13. Various Accelerator Operations C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 13 SR/NS injection switching operation mode This magnet is ON  Transport to SR Beam destination is switched by changing one Switching Magnet status SR L3 NS Sy SPring-8 Accelerator complex      Li      Switching Magnet on off

14. Various Accelerator Operations C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 14 SR/NS injection switching operation mode Switch a destination frequently Top-up operation: continuous injection Features of operation: This magnet is OFF  Transport to NS SR L3 NS Sy SPring-8 Accelerator complex      Li      Switching Magnet on off

15. History of Accelerator Operation MODE C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 15 List of operation mode (part.) READY Mode L2 Mode Sy-injection Mode SR-injection Mode SR-storage Mode L2 + Sy-storage Mode L2 + Sy-storage + SR-storage Mode : The number of Operation mode (MODE): At the beginning (1997~), Accelerator complex consist of Li, Sy and SR

16. History of Accelerator Operation MODE C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 16 List of operation mode (part.) READY Mode L2 Mode Sy-injection Mode SR-injection Mode SR-storage Mode L2 + Sy-storage Mode L2 + Sy-storage + SR-storage Mode L3 Mode L3 + Sy-storage Mode L3 + Sy-storage + SR-storage Mode : The number of Operation mode (MODE): The number of MODE had increased as accelerator upgrade L3 beam-transport added At the beginning (1997~), Accelerator complex consist of Li, Sy and SR

17. History of Accelerator Operation MODE C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 17 List of operation mode (part.) READY Mode L2 Mode Sy-injection Mode SR-injection Mode SR-storage Mode L2 + Sy-storage Mode L2 + Sy-storage + SR-storage Mode L3 Mode L3 + Sy-storage Mode L3 + Sy-storage + SR-storage Mode NS-injection Mode NS-storage Mode L2 + Sy-storage + NS-storage Mode L2 + Sy-storage + SR-storage + NS-storage Mode Sy-injection + SR-storage + NS-storage Mode NS-injection + Sy-storage + SR-storage Mode SR-storage + NS-storage Mode : The number of MODE had increased as accelerator upgrade At the beginning (1997~), Accelerator complex consist of Li, Sy and SR L3 beam-transport added NS storage-ring added The number of Operation mode (MODE):

18. History of Accelerator Operation MODE C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 18 List of operation mode (part.) READY Mode L2 Mode Sy-injection Mode SR-injection Mode SR-storage Mode L2 + Sy-storage Mode L2 + Sy-storage + SR-storage Mode L3 Mode L3 + Sy-storage Mode L3 + Sy-storage + SR-storage Mode NS-injection Mode NS-storage Mode L2 + Sy-storage + NS-storage Mode L2 + Sy-storage + SR-storage + NS-storage Mode Sy-injection + SR-storage + NS-storage Mode NS-injection + Sy-storage + SR-storage Mode SR-storage + NS-storage Mode Topup Mode Topup + NS-storage Mode : The number of MODE had increased as accelerator upgrade L3 beam-transport added NS storage-ring added Topup operation started The number of Operation mode (MODE): At the beginning (1997~), Accelerator complex consist of Li, Sy and SR

19. History of Accelerator Operation MODE C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 19 List of operation mode (part.) READY Mode L2 Mode Sy-injection Mode SR-injection Mode SR-storage Mode L2 + Sy-storage Mode L2 + Sy-storage + SR-storage Mode L3 Mode L3 + Sy-storage Mode L3 + Sy-storage + SR-storage Mode NS-injection Mode NS-storage Mode L2 + Sy-storage + NS-storage Mode L2 + Sy-storage + SR-storage + NS-storage Mode Sy-injection + SR-storage + NS-storage Mode NS-injection + Sy-storage + SR-storage Mode SR-storage + NS-storage Mode Topup Mode Topup + NS-storage Mode Sy ・ NS-injection Mode SR ・ NS-injection Mode Topup ・ NS-injection Mode : The number of MODE had increased as accelerator upgrade  The number of MODEs drastically increased (up to around 60 modes ) L3 beam-transport added NS storage-ring added Topup operation started Destination switching operation started Many MODEs! The number of Operation mode (MODE): At the beginning (1997~), Accelerator complex consist of Li, Sy and SR

20. Old Accelerator Safety Interlock System C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 20 Old design concept: operation MODE based Safety interlock deeply relates with accelerator operation MODE MODE for interlock system also increased as accelerator operation MODE increase For additional accelerator area, 60  120 MODEs ? Complicated safety logic

21. Old Accelerator Safety Interlock System C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 21 MODE system : integrate safety instrument status of all areas MODE based system: determine permissions (GUN/RF) problem: complicated interlock structure (two-way communication etc.) incomplete area separation SR-RF permission Mode Interlock System Mode Interlock System Li-Sy Interlock System Li-Sy Interlock System SR Interlock System SR Interlock System NS Interlock System NS Interlock System L3 Interlock System L3 Interlock System NS-RF permission Status of safety instrument (HW) GUN RF GUN,Li-RF,Sy-RF permission old Accelerator Safety Interlock System component Permissions

22. Motivation C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 22 “New design concept!!” High extendibility for additional new accelerator area Easier maintenance, modification and troubleshoot - New radiation Safety Interlock system - Old design concept  hard to improve problems: - much cost (person, time) for safety inspection - hard to modify the system due to complicated safety logic and system structure

23. New design concept C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 23 New task force formed to establish new design concept: Experts in each division cooperated, Control div. (Accelerator Interlock system) Accelerator div. (Accelerator operation) Safety office Many experts discussed various issue (2005 ~)

24. C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 24 New design concept Old design concept: “ MODE based system” The number of MODEs exponentially increase by adding an new accelerator area We had to find efficient concept

25. C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 25 Area management New design concept We had to find efficient concept Old design concept: “ MODE based system” The number of MODEs exponentially increase by adding an new accelerator area

26. New design concept C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 26 SR L3 NS Sy SPring-8 Accelerator complex Li What is area management? SPring-8: 5 access controlled areas MODE: manage the combination of these areas  combination is not important Each area system should handle own area status independently 1)Access control 2)GUN RF permissions 3)Beam injection

27. C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 27 New design concept Access control function logic GUN permission logic RF permission logic Door lock etc.. Door SW etc. Emergency stop button Radiation Monitor GUN ILK System GUN ILK System RF Access controlled AREA design concept: Area ILK System permission Shutter Beam injection information : Access control

28. New design concept C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 28 Area ILK System : : GUN permission logic GUN ILK System GUN GUN design concept: permission Area ILK System Each area system independently manage Accelerator area Permissions (GUN/RF) Acc. area system only communicates with GUN system by one way direction No MODE management system permission

29. New radiation safety interlock system C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 29 Area management based system: L3 Interlock System L3 Interlock System Status of safety equipment GUN Interlock System GUN Interlock System GUN SR Interlock System SR Interlock System NS Interlock System NS Interlock System Li Interlock System Li Interlock System RF Permissions Sy Interlock System Sy Interlock System RF For area separation: Shutter should be installed for all AREA to know the beam injection Li area, Sy area, GUN permission  independent system

30. Accelerator system upgrade C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 30 Shutter installation: shutter shield Li-Sy shutter shield L3-NS Additional beam shutter and local shield were installed All areas were properly separated SR L3 NS Sy SPring-8 Accelerator complex Li Additional Beam shutter Additional Local shield

31. Radiation safety interlock system upgrade 31 Internal safety inspection. Official safety inspection (with external inspectors)  should be passed -Short shutdown period - a few chance (twice in a year) Replacement of all safety instruments New safety logic and software for PLCs (for 6 systems) Status monitoring/display system Wiring/Re-wiring (Signal/Power/Network) Simulator for new safety logic software Construction For starting accelerator operation - Many things to do (SPring-8 has large and many facilities)

32. Replace Main rack(x2) Remove MODE system, Install GUN system Final Wiring/Re-wiring Radiation safety interlock system upgrade C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 32 Construction timeline: 4 4 5 5 8 8 9 9 10 11 12 1 1 2 2 3 3 6 6 7 7 2007 4 4 5 5 8 8 9 9 10 11 12 1 1 2 2 3 3 6 6 7 7 2008 4 4 5 5 8 8 9 9 10 11 12 1 1 2 2 3 3 6 6 7 7 2009 4 4 5 5 8 8 9 9 10 11 12 1 1 2 2 3 3 6 6 7 7 2010 new instrument development new system rack for replacement Wiring/Re-wiring Status monitor/display system develop/install new instrument develop Replace rack Wiring/Re-wiring New instrument develop/install New SR rack develop Safety inspections We modified all safety system step-by-step Install new safety logic New system!!

33. Result C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 33 Inspection time: Reduced: 5 days  3 days No MODE inspection (inspection sheet: ~ reduced to be 40%) Classified all signals systematically:

34. Result C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 34 Old New Area - MODE/GUN DIO ： 48 DI: 11 Area – Area DIO: 33 0 # of signals Simple/Independent system Easier modification and troubleshoot Signals between each systems: The number of signal is reduced: 81  11 signals Only one way communication from Area to GUN L3 Interlock System L3 Interlock System GUN Interlock System GUN Interlock System GUN SR Interlock System SR Interlock System NS Interlock System NS Interlock System Li Interlock System Li Interlock System RF Sy Interlock System Sy Interlock System RF SR-RF permission Mode Interlock System Mode Interlock System Li-Sy Interlock System Li-Sy Interlock System SR Interlock System SR Interlock System NS Interlock System NS Interlock System L3 Interlock System L3 Interlock System NS-RF permission Status of safety instrument (HW) GUN RF GUN,Li-RF,Sy-RF permission Permissions

35. Result C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 35 easy to expand for additional accelerator area Additional accelerator area: Access control and permissions  independent Communication with other system:  only consider GUN interlock system communication L3 Interlock System L3 Interlock System GUN Interlock System GUN Interlock System GUN SR Interlock System SR Interlock System NS Interlock System NS Interlock System Li Interlock System Li Interlock System RF Sy Interlock System Sy Interlock System RF Additional Acc. Area

36. C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 36 ©RIKEN/JASRI New Accelerator, SACLA (XFEL/SPring-8) 8-GeV LINAC X-ray free electron laser now beam commissioning - SACLA (SPring-8 Angstrom Compact Free Electron Laser: XFEL/SPring-8)

37. C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 37 ©RIKEN/JASRI New Accelerator, SACLA (XFEL/SPring-8) X-ray beam at SACLA 8-GeV LINAC X-ray free electron laser now beam commissioning - SACLA (SPring-8 Angstrom Compact Free Electron Laser: XFEL/SPring-8)

38. C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 38 ©RIKEN/JASRI New Accelerator, SACLA (XFEL/SPring-8) - SACLA (SPring-8 Angstrom Compact Free Electron Laser: XFEL/SPring-8) will be an injector for SPring-8 in the future Future Plan: SACLA - SPring-8 combined operation SR

39. Summary C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 39 We constructed new radiation safety interlock system using “AREA management” Simple Safety inspection period was reduced Reliable Easier maintenance, modification and troubleshoot Extendibility No trouble until now! Future SACLA – SPring-8 combined operation