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Title:

Laser Safety at Jefferson Lab

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video camera monitoring. Experiment Approval Process. Bootstrapping An FEL Laser Safety Program ... Peer Reviews. Laser Expert audit. meetings. meetings ... – PowerPoint PPT presentation

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Learn more at: https://www.jlab.org
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Title: Laser Safety at Jefferson Lab


1
(No Transcript)
2
Orientation Objectives
  • Fundamentals of Laser Operation
  • film laser classification system
  • Overview of ANSI Standard for the Safe Use of
    Lasers
  • Biological Effects of Overexposure to Laser
    Radiation

3
Incandescent light source
Laser light source
1. 2. 3.
1. 2. 3.
4

Medical Approval Form
5
CDRH/ANSI Hazard Classification
  • Class 3a
  • These lasers can be visible, IR or UV.
  • Direct viewing may cause eye injury.
  • Laser power is lt1 mWatt
  • Class 3b
  • These lasers can be visible, IR or UV.
  • Direct and indirect viewing may cause eye
    injury.
  • Laser power is between 5 and 500 mWatt

6
CDRH/ANSI Hazard Classification
  • Class 4
  • High power lasers
  • Direct and Indirect Viewing Hazard
  • Fire Hazard
  • Laser Power is gt500 mWatts
  • Special Considerations
  • invisible beams
  • frequency doubled lasers

7
Conventional Lasers
  • CO2
  • nitrogen
  • argon
  • diodes
  • FIR
  • excimers

8
Free Electron Laser Facility
  • Tunable Infrared Laser
  • medium occupies below grade area
  • 6 user labs on upper level
  • FEL Control room/center for laser ops

9
FEL Theory
10
Jlab FEL Schematic
11
FEL Specifications
CW Operation
Average
Power 600-1000 W Wavelength range
6.5-3 µm Micropulse energy 25
µJ Pulse length 2 ps FWHM nominal
PRF 37.425 MHz, 18.7125 MHz
Bandwidth Fourier transform limited (
0.2-0.5) Beam diameter at lab down to
100 microns Pulsed Operation

Planning to develop the capability of pulsed
operation at rates from single
pulse up to 5 kHz.
12
Eye Physiology
13
Conventional Laser Safety Program
  • Responsibility/Authority
  • Procedures
  • Required controls
  • User Qualifications

14
Responsibility/Authority
  • Laser Safety Officer
  • Laser System Supervisor

15
Procedures
  • Laser Standard Operating Procedure
  • (LSOP)
  • Author LSS
  • Approvals Management, LSO

16
User Qualifications
  • General laser safety orientation
  • Laser Specific safety training
  • Medical Approval

17
Class 3b Required Controls
  • Same as Class 4 with two exceptions
  • 1. interlocked smoke detector not required
  • 2. crash button not required

18
Class 4 Required Controls
  • Smoke detector interlock to laser power
  • Entrance door interlock to shutter or power
  • Yellow beacon inline with power
  • Crash button inside and outside the laser area
  • Emission time delay 10 second minimum
  • Approved schematic of safety interlock system

19
Special hazards associated with the FEL The
Accelerator
  • accelerator hazards
  • vacuum
  • ionizing radiation
  • high voltage
  • cryogenics

20
Special Hazards Associated with the FEL User
Lab Issues
  • User equipment
  • Power levels
  • Picosecond pulse structure
  • Harmonics
  • Tunability
  • Vacuum

21
Power
22
Picosecond Pulse Structure
  • Existing ANSI standard does not address MPEs for
    picosecond pulses
  • picosecond pulse structure may be more efficient
    in causing injury

23
Harmonics
  • Estimate 10-h ,where h is the harmonic.
  • Estimate because harmonics may be lowered by
    optical transport system
  • some data suggests increases in estimates
    associated with the higher harmonics

24
Tunability Laser Safety Goggles
  • KG3 material
  • window at 2.7 microns
  • mitigation
  • 1. find a material that absorbs at 2.7 microns
    and sandwich it to the KG3
  • 2. for now, no lasing at 2.7 microns

25
Vacuum Issues
  • Must transport beam in vacuum to minimize effects
    of CO2 / H2O on the beam
  • Optical transport system user interface is vacuum
    window
  • window must be protected to avoid loss of vacuum

26
Special Hazards Associated with the FEL
Personnel Issues
  • Two categories of experimenters/Safety Cultures
  • Jefferson Lab Employees
  • Users

27
User Labs Additional Controls
  • Robust laser safety interlock system
  • FEL control room with permissive to user shutter
  • video camera monitoring
  • Experiment Approval Process

28
Bootstrapping An FEL Laser Safety Program
  • Benchmarking
  • Peer Reviews
  • Laser Expert audit

meetings meetings arguments
29
Benchmarking
  • Information gathering from other FEL facilities
  • Drawing on past experience
  • audit of three high energy laser labs

30
Reviews/Audits
  • Accelerator Readiness Review
  • Personal Safety System Review
  • Laser Safety System Review
  • Anteon Audit
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