The Personnel Interlock System of the European XFEL · PDF fileThe Personnel Interlock System...

B. RackyDeutsches Elektronen- Synchrotron DESY

The Personnel Interlock System of the European XFEL

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RADSYNCH2013, May 8-13, 2013, BNL, BrookhavenBrunhilde Racky, DESY

European XFEL accelerator complex

17.5 GeV superconducting electron linac3.8 km tunnel systemStart version: 3 undulators with variable gap/ 6 photon experiments16 institutes contributing

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Parameter

Quantity Valueelectron energy 17.5 GeVmacro pulse repetition rate 10 HzRF pulse length (flat top) 600 μsbunch repetition frequency within pulse 4.5 MHzbunch charge 0.02 – 1 nCelectron bunch length after compression (FWHM) 2 – 180 fsSlice emittance 0.4 - 1.0 mm mradbeam power 500 kW# of modules (containing eight 9-cell superconducting 1.3 GHz cavities)

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accelerating gradient for 17.5 GeV 23.6 MV/m# of 10 MW multi-beam klystrons 27average klystron power (for 0.03 mA beam current at 17.5 GeV)

5.2 MW

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Machine overview

Experimental Hall

Beam DumpsUndulators

Collimation

Bunch Compressors

Linear Accelerator

Injector

Photon Beam LinesElectron Beam Distribution

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Injector complex

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Linac tunnel XTL

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Photon experiments @ Schenefeld site

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SQSSCS

SPB FXE

MID HED

Within 1 RF puls2 e--beamlines5(+) undulators15(+) instruments

Fast beam distribution

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Interlock areas

XTIN1/2

XSIN XSE

XS1

XS2 XS4

XSDU1

XS3

XSDU2

XHM

XTL

XTD3 XTD8

XTD2 XTD950m 1050m 1050m

480m361m

300m

594m

660m

267m

141m

200m

544m

220m

1

1L

1

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L

L

L

L

L

L

1

1

1

L

L

L

L

1

1

1

L

1

XH

EX

P1

Accelerator complex17 interlock areas38 interlock doors 5 interlocked lifts

Injector1 level Lift

XS1

Lift

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Door Interlock

Special challenges due to construction geometry

definition of reasonable interlock search segmentsfire protection doors used as interlock doorslarge media shafts

Injector complex: vertical interlock search of 4 levelsLifts for persons/material leading into the beam areas

Interface personnel interlock / lift controlsIf the interlock is set the lift cannot drive into searched area

Interlock contacts in the lift shafts underneath the radiationprotection ceiling

Lift breaks interlock if contacts are touched

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Controlled access to searched areas

= overriding safety functions of the door interlockSafety equipment

Each entering person takes 1 interlock access keyAll interlock keys of the corrsponding operation mode must be returnedfor beam operation

Safety measuresmatching locks near the interlock doorsonly 1 person may enter at each access procedureif any access key is missing no new beam warning is possible in theentire accelerator complex

Support Operators in the control roomCamera at the door / monitor in the control roomIntercom connection, switchable door panels

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Beam operation modes

8 beam warning sections defined

Interlocked tunnels Beam dump

XTIN1 dump1 XSE

XTIN2 dump2 XSE

XTL (RF operation cold modules) commissioning dump XS1

XTIN1, XTL commissioning dump XS1

XTIN1/2, XTL, XTD1-3-5-7 main dump XSDU1

XTIN1/2, XTL, XTD2-4-10 main dump XSDU2

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Safety @ beam operation

ChallengesSafety against direct electrons in experimental hallaccess to tunnels during beam operation in other branches

Problem: Fast distribution system (septa, flat top kickers) cannot becontrolled by personnel interlockSafety measures

Survey of dipole magnetsStatus off / groundedStatus on / I > threshold (no fail safe concept)

Insertion of permanent dipole magnetsMoved into electron beam lines for accessFix installation in photon beam lines (not interlocked)

Beam shutters

W. Decking, April 2013

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XFEL Beam shutters (BS)

clearance signal of the personnel interlock to steer openBS serve as shielding for bremsstrahlungBS can be damaged if hit by electron or photon beamBS protection measures are surveyed by the personnel interlock

Photon beam lines (design WP-73)BS open or protecting Absorber closed

Electron beam lines (design WP-19)BS open or deflecting magnets ok

In case of failure: abort of beam operation (RF off)

H. Sinn

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Access safety conditions

Access to Beam in Interlocked safety components

XTL XTIN1 Dipole magnet dump I1 onPermanent magnet I1 moved in Beam shutter Inj.1 closed

XTIN1 XTL Beam shutter Inj.1 closed

XTD1 XTL(+ XTD2)

Dipole magnet BD.2.T1 on Magnets T1 off Beam shutter T1 closed

XTD2 XTL(+ XTD1)

Dipole magnet BD.10.T2 onPermanent magnet T2 moved inBeam shutter T2 closed

XTD6 XTD1 (-3-7) Beam shutter & absorber T6 closed



XSIN

XSE

XS1

XS2

XS4

XSD

U1

XS3

XSD

U2

XHEXP1

XTIN1

XTL

XTD3

XTD8

XTD2

XTD9

XHEXP1 XTD1 (-3-7) Magnets T3, T5, T5D on

XHEXP1 XTD2 (-4-10) Magnets T4, T4D on

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Control of machine components

Personnel InterlockMagnet power supplies (electrical safety)All klystron modulatorsBeam shutters and absorbers

Machine protection systembeam loss monitorsproper steering of the beam to avoid lossesControl of dump load

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RF operation

HV Modulator 1

Preamp. / RF filter

Klystron 1

Module 1(8 cavities)




Absorber 1 Absorber 2

Hall XHM

Tunnel XTL

Personnel interlock klystrons

Shortcut plates with contacts for thepersonnel interlock

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Module coupler commisioning @ tunnel access

Idea: Conditioning of RF power couplersin warm accelerator modules

modules must be warm (T>200 K)RF cannot generate dark current on cold resonance frequencySafety signal: temperature threshold

RF not on warm resonance frequency!Narrow RF band filtersin RF drive of klystron (LLRF controls)Safety signal: contact of filter position

First implementation at XFEL module test facilities

H. Schlarb, MSK

T. Böckmann, MKS2

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Technology I: approved systems at DESY

CAN Terminal Box

Elektronic Modules

Safety relays

60 V-Technik

2 Systems

CANopen-Interface

Klystron modulators

Field computerDebian Linux

JAVA Software

TINE-Server

CANBus1

Control System

GUI

Switch/

Interlock LAN

CANBus2

Blinking lampstunnelDoor locking Door panels

FPGAs

Search buttons

Beam shutter-steering

High safety level

Door contacts

Interlock keys

Emergency off buttons

Beam shutter contacts

Magnet status

Radiation monitors

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Technology II: new developments

New type of door interlock modulesProcessing of controlled accessSafety PLC for special applicationsEthersound for warning announcementsIntercom and video system, HD camerasLED warning lamps (yellow blinking)

First implementation at FLASH2 (2013)

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Application of new safety standards

CE certifications required for in house developmentsno problem for interlock electronics

Standard for safety systems: EN 61508 EN ISO 13849 not applicable for our system architectureAlternative standard EN 62061 must be applied

Review of the functional safety of approved systemsCalculation of safety performance levelsHigh QM requirements: review /upgrade of documents and proceduresQualification of staff

Consultation by TÜV RheinlandGermany’s leading experts in functional safety

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Schedule

Civil ConstructionXTLHalls XHEE, XHE1

LINAC FabricationCavity ProductionString AssemblyModule Assembly

XTL Installation & CommissioningInfrastructureMachinefinal installation & cool down

first beam in LINACfirst SASE (earliest possible date)

2012 2013 2014 2015

Start-up of series production and assembly

final installation and commissioning

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First interlock installations

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Contributing team

DESY interlock group MPS

Conceptual design XFEL interlock M. Dressel, A. Rathjen, B. RackyW. Decking, M. BielerN. Tesch, A. Leuschner, W. Clement

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