New Radiation Safety Interlock System forthe SPring-8 Accelerator Complex

C. Saji, M. Toko, T. Matsushita, R. Furuta, H. Hanaki, S. Hashimoto1), Y. Hashimoto, M. Kago, K. Kawata, T. Masuda, S. Miyamoto1), 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. 2011The 3rd Accelerator Reliability Workshop

e-mail: saji@spring8.or.jp

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

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 .

Outline

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex3

• Introduction• Motivation• New radiation safety interlock system• Summary & Future

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

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 GUNUp to 1GeV

SPring-8 Accelerator complex

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

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

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

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)

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

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

LiGUN

RF

RF

RF

RF

- One electron GUN supplies electron beam to all area

Combination of areas Many kinds of operations

Switching Magnet

Various Accelerator Operations

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex12

- Beam transportation route: Switching Magnets

SR injection operation mode

SR

L3

NS

Sy

SPring-8 Accelerator Complex

Li

Switching Magnet

on

off

Various Accelerator Operations

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex13

SR/NS injection switching operation mode

This magnet is ON Transport to SR

Beam destination is switchedby changing one Switching Magnet status

SR

L3

NS

Sy

SPring-8 Accelerator complex

Li

Switching Magnet

on

off

Various Accelerator Operations

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex14

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

History of Accelerator Operation MODE

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex15

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

History of Accelerator Operation MODE

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex16

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

History of Accelerator Operation MODE

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex17

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):

History of Accelerator Operation MODE

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex18

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

History of Accelerator Operation MODE

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex19

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

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

Old Accelerator Safety Interlock System

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex21

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

perm

issio

n

ModeInterlockSystem

ModeInterlockSystem

Li-SyInterlockSystem

Li-SyInterlockSystem

SRInterlockSystem

SRInterlockSystem

NSInterlockSystem

NSInterlockSystem

L3InterlockSystem

L3InterlockSystem

NS-RFpermission

Status of safety instrument (HW)

GUN

RF

RF

RFRF

GUN,Li-RF,Sy-RF

permission

old Accelerator Safety Interlock System component

Permissions

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

New design concept

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex23

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 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

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

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 independently1)Access control2)GUN RF permissions3)Beam injection

New design concept

Access control function logic

GUN permission logicGUN permission logicRF permission logicRF permission logic

Door lock etc..

Door SW etc.

Emergency stop button

Radiation Monitor

GUN ILKSystemGUN ILKSystem

RFRF

Access controlled AREA design concept:

Area ILK System

permission

permission

Shutter

Beam injection information

:

Access control

New design concept

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 28

Area ILK SystemArea ILK System:

:Area ILK SystemArea ILK System

GUN permission logicGUN permission logic

GUN ILK System

GUNGUN

GUN design concept:

permission

Area ILK SystemArea 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

New radiation safety interlock system

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 29

Area management based system:

L3InterlockSystem

L3InterlockSystem

Status of safety equipmentGUN

InterlockSystem

GUNInterlockSystem

GUN

SRInterlockSystem

SRInterlockSystem

NSInterlockSystem

NSInterlockSystem

LiInterlockSystem

LiInterlockSystem

RF

Permissions

SyInterlockSystem

SyInterlockSystem

RF RF RF

For area separation: Shutter should be installed for all AREA to know the beam injection

Li area, Sy area, GUN permission independent system

Accelerator system upgrade

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex30

Shutter installation:

shuttershield

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 shutterAdditional Local shield

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)

• 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 Complex32

Construction timeline:

44 55 88 99 1010 1111 1212 11 22 3366 772007

44 55 88 99 1010 1111 1212 11 22 3366 772008

44 55 88 99 1010 1111 1212 11 22 3366 772009

44 55 88 99 1010 1111 1212 11 22 3366 772010

• new instrument development• new system rack for replacement

• Wiring/Re-wiring • Status monitor/display systemdevelop/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 logicNew system!!

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:

Result

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex 34

Old NewArea - MODE/GUN DIO ： 48 DI: 11Area – 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 communicationfrom Area to GUN

L3InterlockSystem

L3InterlockSystem

GUNInterlockSystem

GUNInterlockSystem

GUN

SRInterlockSystem

SRInterlockSystem

NSInterlockSystem

NSInterlockSystem

LiInterlockSystem

LiInterlockSystem

RF

SyInterlockSystem

SyInterlockSystem

RF RF RF

SR-RF

perm

issio

n

ModeInterlockSystem

ModeInterlockSystemLi-Sy

InterlockSystem

Li-SyInterlockSystem

SRInterlockSystem

SRInterlockSystem

NSInterlockSystem

NSInterlockSystem

L3InterlockSystem

L3InterlockSystem

NS-RFpermission

Status of safety instrument (HW)

GUN

RF

RF

RF

RF

GUN,Li-RF,Sy-RF

permission

Permissions

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

L3InterlockSystem

L3InterlockSystem

GUNInterlockSystem

GUNInterlockSystem

GUN

SRInterlockSystem

SRInterlockSystem

NSInterlockSystem

NSInterlockSystem

LiInterlockSystem

LiInterlockSystemRF

SyInterlockSystem

SyInterlockSystemRF RF RF

AdditionalAcc.Area

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)

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)

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-8combined operation

SR

Summary

C. Saji: New Radiation Safety Interlock System for the SPring-8 Accelerator Complex39

• We constructed new radiation safety interlock systemusing “AREA management”

• Simple Safety inspection period was reduced• Reliable

Easier maintenance, modification and troubleshoot Extendibility

•No trouble until now!

FutureSACLA – SPring-8 combined operation