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LaserMatter Interactions at SCARLET Science Center for Advanced Research on Lasers

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Thus enabling systematic studies of ultraintense laser ... Target camera and lens (orthogonal) SCARLET CHAMBER. METROLOGY STATION. Hexapod: Alio Industries ... – PowerPoint PPT presentation

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Title: LaserMatter Interactions at SCARLET Science Center for Advanced Research on Lasers


1
Laser-Matter Interactions at SCARLETScience
Center for Advanced Research on Lasers
Engineered Targets
  • Presented at the Fast Ignition Workshop
  • 05 November 2006
  • Linn Van Woerkom
  • The Ohio State University

2
Goal
  • Develop techniques/protocols for the new
    generation of rep-rated Petwatt-class lasers
  • Targets ? mass production insertion
  • Diagnostics
  • Data management
  • Thus enabling systematic studies of ultraintense
    laser-matter interactions
  • With ultimate GOAL of providing test-bed
    infrastructure for developing point designs for
    Fast Igniton

3
We are NOT ..
  • building a big, bad laser ..

4
Why Another Center?
  • Currently there are many 20 200 TW lasers
  • Many laser-matter processes studied
  • Limitations due to low duty cycle
  • Need better statistics reproducibility
  • Eventually need power plant
  • Solution ? Build high rep rate petawatt lasers
  • Problem ? What to do w/ rep-rated Petawatt laser?
  • What about targets?
  • current targets 1-5k each ? at 1 Hz that hurts
  • Need mass production
  • What about diagnostics
  • Currently film packs used for many diagnostics
  • What about data collection? ? high data rates

5
The Team
  • The Ohio State University
  • PIs ? L. Van Woerkom R. Freeman
  • Optics diagnostics ? Dr. Enam Chowdhury
  • Facility Integration ? John Marketon
  • General Atomics
  • PI ? R. Stephens
  • Design ? Neil Alexander others
  • Targeting collaboration with CLF at RAL, UK

6
The Place
  • Nuclear Physics Van de Graaff Facility
  • 10,000 ft2 total
  • 3000 ft2 High bay
  • Lots of electrical
  • Renovations in initial design phase

7
The Place II
8
The New Place
9
The Plan
  • Now ? parallel efforts
  • OSU purchases 20 TW system
  • 20 fs, 400 mJ, 10 pps TiS commercial system
  • OSU renovates Van de Graaff building
  • OSU develops rep-rated diagnostics
  • OSU develops data management systems
  • GA designs builds prototype target carrier
  • Test at LLNL and/or others
  • Work with target designers at RAL, UK
  • Move into new facility July 2008
  • Upgrade laser to 250 1000 TW

10
Need Systematic Studies
Real Progress ? reproducible data ? rep-rated
systems
  • To explore efficiencies
  • Laser-electron ? front surface morphology
  • Laser-proton ? rear surface morphology
  • To understand relativistic charge transport
  • Surface fields resistivity
  • Transport in dense plasmas
  • To develop diagnostic abilities
  • Transfer technology to large facilities

On the road to a real point design ..
11
Requirements
  • 0.1 1.0 Petawatt Peak Power
  • PRR ? 10 shots/hour scaleable to Hz level
  • Two short pulse beams
  • Automated target insertion alignment
  • Automated focus correction on each shot
  • Reasonable contrast ratio
  • Highly diagnosed laser record of each shot
  • Modular architecture ? if stops we dont

12
Concept Schematic
  • Thermal loading issues
  • Need to load w/o amplifying
  • Feedback to adaptive optics
  • Scaleable to higher PRR

Rep-rated diagnostics
diagnostic
diagnostic
diagnostic
diagnostic
Rapid target insertion
  • target must align to diagnostics
  • laser must align to target

Adaptive optics
13
Power Energy Issues
  • Must produce peak focused intensities in the
    range of
  • Use ultrashort pulses ? 25 35 fs
  • At 25 fs
  • 1 PW ? 25 J/pulse
  • 40-50 J before compression
  • 100-200 J/pulse pump energy for TiS

14
Pulse Repetition Rate Issues
  • Start easy ? minutes between shots
  • We need the time for target manipulation
  • Scale later to hertz-ish rates
  • Solve problems along the way to higher PRR

15
Alignment Procedure Issues
  • Diagnostics ? fixed point in space
  • How do we make it find it?
  • Align target to diagnostic center
  • How to align rep-rated targets?
  • Align laser to target
  • straightforward using industrial technology?
  • Maintain optimal focal properties
  • How do we move focus w/o destroying focus?

16
Target Insertion Issues
  • Must handle 10 shots/hour scale to faster
  • Run several hours w/o venting target chamber
  • Handle complex targets
  • Multilayers
  • Cones
  • Structures
  • Must be economical!!??
  • Align target to diagnostic center
  • Use industrial machine vision
  • Advanced image processing
  • Protect subsequent targets
  • Radiation issues?
  • Debris issues

17
Target Fabrication
18
Metrology SCARLET Positioner
  • A transfer standard is passed between the systems
  • A reference target (e.g. a rigidly mounted cube)
    is put in the Metrology Station
  • Its center and orientation are noted

SCARLET CHAMBER
Fiducial cameras (orthogonal)
METROLOGY STATION
Target camera and lens (orthogonal)
Hexapod Alio Industries
Fiducial cameras (orthogonal)
Target
Fiducial lasers (orthogonal)
Fiducial lasers (orthogonal)
Hexapod Positioner
Hexapod Positioner
19
The Hexapod
High Vacuum Version
Hexapod for Prototype
Hexapods made by Alio industries
20
Target System
Target Elevator
Hexapod
Optical table leg
Vacuum chamber jacket around leg
Attachment port for target magazine
21
Target Handling
Target Manipulator shaft
Target Elevator
Target Assemblies will get dropped of here (tube
will surround hexapod, shown here offset
Target Alignment Tube and receptacle attach to
hexapod here
Hexapod
22
Alignment Issues
  • Diagnostics bolt onto fixed chamber
  • Must maximize solid-angle real estate
  • Some diagnostics use collection optics
  • Ka XUV
  • Can we move the collection optic and align to the
    target?
  • What about laser pointing stability?
  • Must be Titan-like and then better

know everything about everything on EVERY shot
? AT HIGH REP-RATE
23
Conclusions
  • SCARLET at OSU ? laser-target facility
  • Look at rep-rated system issues
  • Targets
  • Diagnostics
  • Data Management
  • Goal is to develop the infrastructure for
    rep-rated HEDP
  • We have the building
  • Design in progress
  • Phase I Target Insertions 20 TW laser Summer
    08
  • GA designing targets carriers metrology
  • Technology transferred to other facilities
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