New Radiation Safety Interlock System for the SPring8

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) e-mail: saji@spring 8. or. jp 12 Apr. 2011 The 3 rd Accelerator Reliability Workshop

Education: Ph. D, 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. C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 2

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

Introduction SPring-8 Accelerator complex • Electron accelerator • Light source facility Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L 3 beam-transport (L 3) New. SUBARU storage ring (NS) ©RIKEN/JASRI C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 4

Introduction SPring-8 Accelerator complex Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L 3 beam-transport (L 3) New. SUBARU storage ring (NS) Linac: Include electron GUN Up to 1 Ge. V ©RIKEN/JASRI C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 5

Introduction SPring-8 Accelerator complex Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L 3 beam-transport (L 3) New. SUBARU storage ring (NS) Synchrotron Booster: Up to 8 Ge. V ©RIKEN/JASRI C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 6

Introduction SPring-8 Accelerator complex 8 Ge. V Storage ring Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L 3 beam-transport (L 3) New. SUBARU storage ring (NS) ©RIKEN/JASRI C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 7

Introduction SPring-8 Accelerator complex Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L 3 beam-transport (L 3) New. SUBARU storage ring (NS) L 3 beam transport line: Other beam destination ©RIKEN/JASRI C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 8

Introduction SPring-8 Accelerator complex Linac(Li) Synchrotron Booster(Sy) Storage Ring(SR) L 3 beam-transport (L 3) New. SUBARU storage ring (NS) New. SUBARU: Another Storage ring (Low energy) ©RIKEN/JASRI C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 9

Accelerator Radiation Safety Interlock System 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 C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 10

Accelerator operation NS - Five access controlled areas: GUN Li Beam pipe L 3 RF Switching Magnet RF Beam shutter Sy - One electron GUN supplies electron beam to all area Gun/RF - Beam generation/acceleration: - One electron gun generates electron beam(GUN) - Electron beam is accelerated by RF cavity (RF). - Four RFs RF Linac (Li) Synchrotron Booster (Sy) Storage Ring (SR) L 3 beam-transport (L 3) New. SUBARU storage ring (NS) SR RF SPring-8 Accelerator complex Combination of areas Many kinds of operations C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex

Various Accelerator Operations NS SR injection operation mode Switching Magnet off on L 3 Li Sy - Beam transportation route: Switching Magnets SR SPring-8 Accelerator Complex C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 12

Various Accelerator Operations NS Switching Magnet off on Li Sy This magnet is ON Transport to SR Beam destination is switched by changing one Switching Magnet status L 3 SR/NS injection switching operation mode SR SPring-8 Accelerator complex C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 13

Various Accelerator Operations L 3 Switching Magnet off on SR/NS injection switching operation mode NS Features of operation: Li • Switch a destination frequently • Top-up operation: continuous injection Sy This magnet is OFF Transport to NS SR SPring-8 Accelerator complex C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 14

History of Accelerator Operation MODE The number of Operation mode (MODE): List of operation mode (part. ) At the beginning (1997~), Accelerator complex consist of Li, Sy and SR • • READY Mode L 2 Mode Sy-injection Mode SR-storage Mode L 2 + Sy-storage + SR-storage Mode : : C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 15

History of Accelerator Operation MODE The number of Operation mode (MODE): List of operation mode (part. ) At the beginning (1997~), Accelerator complex consist of Li, Sy and SR • The number of MODE had increased as accelerator upgrade • L 3 beam-transport added • • • READY Mode L 2 Mode Sy-injection Mode SR-storage Mode L 2 + Sy-storage + SR-storage Mode L 3 + Sy-storage + SR-storage Mode C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex : : 16

History of Accelerator Operation MODE The number of Operation mode (MODE): List of operation mode (part. ) At the beginning (1997~), Accelerator complex consist of Li, Sy and SR • The number of MODE had increased as accelerator upgrade • L 3 beam-transport added • NS storage-ring added • • • • • READY Mode L 2 Mode Sy-injection Mode SR-storage Mode L 2 + Sy-storage + SR-storage Mode L 3 + Sy-storage + SR-storage Mode NS-injection Mode NS-storage Mode L 2 + 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 : : C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 17

History of Accelerator Operation MODE The number of Operation mode (MODE): List of operation mode (part. ) At the beginning (1997~), Accelerator complex consist of Li, Sy and SR • The number of MODE had increased as accelerator upgrade • L 3 beam-transport added • NS storage-ring added • Topup operation started • • • • • READY Mode L 2 Mode Sy-injection Mode SR-storage Mode L 2 + Sy-storage + SR-storage Mode L 3 + Sy-storage + SR-storage Mode NS-injection Mode NS-storage Mode L 2 + 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 + NS-storage Mode : : C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 18

History of Accelerator Operation MODE The number of Operation mode (MODE): List of operation mode (part. ) At the beginning (1997~), Accelerator complex consist of Li, Sy and SR • The number of MODE had increased as accelerator upgrade • L 3 beam-transport added • NS storage-ring added • Topup operation started • Destination switching operation started The number of MODEs drastically increased (up to around 60 modes ) • • • • • • READY Mode L 2 Mode Sy-injection Mode SR-storage Mode L 2 + Sy-storage + SR-storage Mode L 3 + Sy-storage + SR-storage Mode NS-injection Mode NS-storage Mode L 2 + 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 + NS-storage Mode Sy・NS-injection Mode SR・NS-injection Mode Topup・NS-injection Mode Many MODEs! C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex : : 19

Old Accelerator Safety Interlock System 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 C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 20

Old Accelerator Safety Interlock System MODE based system: Status of safety instrument (HW) F MODE system : • integrate safety instrument status of all areas • determine permissions (GUN/RF) Mode Interlock System NS rm -RF iss ion pe pe SR rm -R iss F io n Li-Sy Interlock System GUN RF RF -R , Sy F R , Li- ission N GU perm Permissions SR Interlock System RF NS Interlock System RF L 3 Interlock System old Accelerator Safety Interlock System component problem: • complicated interlock structure (two-way communication etc. ) • incomplete area separation C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 21

Motivation - 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 “New design concept!!” • Easier maintenance, modification and troubleshoot • High extendibility for additional new accelerator area C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 22

New design concept 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 ~) C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 23

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 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 Area management C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 25

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

New design concept Access controlled AREA design concept: Door SW etc. Area ILK System Emergency stop button Radiation Monitor : Shutter Beam injection information Access control function logic Access control permission RF permission logic GUN permission logic permission Door lock etc. . RF GUN ILK System

New design concept GUN design concept: Area ILK System : : permission GUN ILK System permission GUN permission logic GUN 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 C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 28

New radiation safety interlock system Area management based system: GUN Status of safety equipment Permissions Li Interlock System RF Sy Interlock System RF GUN Interlock System SR Interlock System RF L 3 Interlock System NS Interlock System RF Li area, Sy area, GUN permission independent system For area separation: Shutter should be installed for all AREA to know the beam injection C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 29

Accelerator system upgrade Shutter installation: Additional beam shutter and NS local shield were installed Additional Beam shutter Additional Local shield Li-Sy shutter L 3 shield Li L 3 -NS Sy SR SPring-8 Accelerator complex shield shutter All areas were properly separated C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 30

Radiation safety interlock system upgrade - Many things to do (SPring-8 has large and many facilities) Construction • 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 For starting accelerator operation • Internal safety inspection. • Official safety inspection (with external inspectors) should be passed -Short shutdown period - a few chance (twice in a year) 31

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

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

Result Status of safety instrument (HW) Mode Interlock System -RF , Sy F n i-R N, L ssio GU permi pe NS rm -RF iss ion pe SR rm -R iss F io n Li-Sy Interlock System Permissions GUN RF RF RF SR Interlock System Signals between each systems: NS Interlock System L 3 Interlock System # of signals Old New Area - MODE/GUN DIO： 48 DI: 11 Area – Area DIO: 33 0 RF • The number of signal is reduced: 81 11 signals GUN Interlock System Li Interlock System RF Sy Interlock System RF SR Interlock System RF • Only one way communication from Area to GUN L 3 Interlock System NS Interlock System RF • Simple/Independent system • Easier modification and troubleshoot C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 34

Result Additional accelerator area: GUN Interlock System Li Interlock System RF Sy Interlock System RF SR Interlock System RF L 3 Interlock System NS Interlock System RF Additional Acc. Area • Access control and permissions independent • Communication with other system: only consider GUN interlock system communication easy to expand for additional accelerator area C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 35

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

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

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 ©RIKEN/JASRI C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 38

Summary • 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 C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 39