A PLC-based Laser Safety System at SLAC

Jeff Corbett, Perry Anthony and Mike Woods SLAC National Accelerator Laboratory

10th Annual DOE Laser Safety Officer Workshop August 19-21, 2014

Lawrence Livermore National Laboratory

Outline

• A brief history of SLAC • Electron gun test laboratory • Laser bay safety system • Gun vault safety system • Documentation • Some Lessons learned

1962: 3km Linear Accelerator Construction

LINAC Section Hansen, Varian brothers

Circa 1964

Klystron Gallery

S-band accelerator

1000 segments

250 klystrons

Accelerator Structure

View looking East View looking West

6

Progressive Linac Applications

Klystron Test Lab

• synchrotron radiation • SLC

• B-factory • LCLS

• e+-e- storage rings • fixed target

• Cosmology and the LCLS-II

LCLS-I and LCLS-II from above

4 GeV SC linac

MHz NC gun

15 GeV existing linac

Far Experimental Hall

Near Experimental Hall One tunnel, 2 Undulators

Photocathode gun

: Class 4 laser lab

Gun test lab

The ASTA Photocathode Gun Test Laboratory

Ti:Sapphire Laser LCLS Research Electron Gun

Diagnostics

Laser Hall

Gun Vault

The ASTA Laser Laboratory

Hazard Sign and Visitor Policy

Eyewear Storage

Ti:Sapphire + Harmonics

Maintenance Mode

The Master Control Panel

Touchscreen Guts

Laser Safety System - Initial Acceptance Test

Class 4 Maintenance Mode

Emergency Off

defeatable interlocks

Regen labels

Googles Off Googles On

Maintenance Mode: Green Blockers

‘Wear thy GoGGles’

Transport Shutters leading to Gun Vault

Enclosed, labeled, tool

Dual shutters

Lockout capacity

Labels cover bolts

Legend Elite Regen • 2 stretchers • 1 compressor

Vitara Oscillator

Laser Safety Curtain

Evo

lutio

n

Ho

llo

w F

iber

status

EO

EO

S1

S3

T1 T2

Eyewear Storage

RFID

Bypass for Exit

visible continuum

THG

Master Control Panel status

Gu

n V

ault

EO

Recap of the Laser Bay Break-glass

VERDI 5W

2.5W

UV

Co

mp

res

sio

n

SPIDER

0.5W, 800nm

5W, 800nm

50mW, 1ps

25 feet

EO

S2

S4

femtosec

compress

Room Exit Bypass (15 sec)

Photocathode Gun

EO

T2 T1

Optical bench

status

Photocathode Gun Vault

Bypass for Exit

RFID

LSS Gate

Bre

ak-glass

EO

PP

S P

ane

l

PPS Gate

status

EO

Master Control Panel

Lase

r H

all

Class 4 UV

4’ concrete

Electron Gun Vault Entrance

Badge for Entry

Radiological control

Laser Safety Gate

Laser Safety in the Gun Vault

Transport Shutter Control Panel

Photocathode Electron Gun

Enclosed compressor, tripler, etc (not Class 1)

Main Documents, Authorizations, Inspections

Laboratory Personnel Records

Thank you!