Costello/Kennedy/Mosnier/van%20Kampen - PowerPoint PPT Presentation

Title: Costello/Kennedy/Mosnier/van%20Kampen


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CLPRResearch in Laser Plasmas

• Costello/Kennedy/Mosnier/van Kampen
• National Centre for Plasma Science Technology
  (NCPST) and School of Physical Sciences, Dublin
  City University

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Outline

• The Centre for Laser Plasma Research
  (CLPR)-NCPST-Who are we what do we do ?
• Table Top Laser Generated Plasma Basics
• Projects

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NCPST/CLPR Who are we ? What do we do ?
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NCPST/ CLPR - Who are we ?

• NCPST established with Irish Government funding
  (Euro 8M) in 1999. Now EU Training Site.
• Consortium of new and existing laboratories in
  plasma physics, chemistry and engineering
• Fundamental and Applied Scientific Goals
• CLPR node is divided into 4(6) laboratories
  focussed on PLD and photoabsorption spectroscopy/
  imaging (especially in UV - X-ray)

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The CLPR node comprises 6 laboratory areas
focussed on pulsed laser matter interactions
(spectroscopy/ imaging)
Academic Staff (4) John T. Costello, Eugene T.
Kennedy, Jean-Paul Mosnier and Paul van
Kampen Post Doctoral Fesearchers (5) Dr.
Deirdre Kilbane (PVK/JC) Dr. Hugo de Luna
(JC) Dr. Jean-Rene Duclere (JPM) Dr. Pat Yeates
(ETK) Dr. Mark Stapleton (JC) PhD students (8)
Caroline Banahan (PVK/JC) Kevin Kavanagh
(JC) Adrian Murphy (JC) John Dardis
(JC) Jonathan Mullen (PVK) Rick O'Hare
(JPM) Eoin OLeary (ETK) Rebecca Treacy
(PVK) Visiting PhD student (2) Michael Novotny
(JPM) and Philip Orr (JC)
Funded by SFI - Frontiers and Investigator HEA -
PRTLI and North-South IRCSET - Embark
BRGS Enterprise Ireland - BRGS EU - Marie Curie
and RTD
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Research Theme Probing matter with fast and
ultrafast UV, extreme-UV and X-ray
pulses (Imaging/Spectroscopy in the UV - Soft
X-Ray)
Figure from lectures notes of David Attwood, U
Calif.-Berkeley
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NCPST/ CLPR - What do we do ?
DCU Pico/Nanosecond Laser Plasma Light
Sources VUV, XUV X-ray Atomic Absorption
Spectroscopy VUV Photoabsorpion Imaging VUV LIPS
for Analytical Purposes Pulsed Laser Deposition
(PLD)/ICCD Imaging and Spectroscopy of PLD
Plumes Aarhus/Berkeley Synchrotrons Photoion and
Photoelectron Spectroscopy Hamburg -
FEL Femtosecond IRXUV Facility Development
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Part I - Table Top Laser-Plasma Basics
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Plasma The 4 Phases of Matter Greek
Philosophers Physicists Earth
Solid Water Liquid Wind Gas
Fire Plasma
Plasma Fluid (gas) of electrons and ions
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How do you make a laser plasma ?
Vacuum or Background Gas
Target
Plasma Assisted Chemistry
Laser Pulse- 1 J/ 10 ns
Lens
Spot Size 100 mm (typ. Diam.) F gt 1011
W.cm-2 Te 100 eV (106 K) Ne 1021
cm-3 Vexpansion ? 106 cm.s-1
Emitted - Atoms, Ions, Electrons, Clusters, IR -
X-ray Radiation
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Intense Laser Plasma Interaction
S Elizer, The Interaction of High Power Lasers
with Plasmas, IOP Series in Plasma Physics
(2002)
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In summary we know thatLaser Produced Fireballs
are-Hot Te 105 - 108 KelvinDense ne
1021 e/cm3Transient ps - msRapid 106 - 107
cm/sec Dublin to Cork in 3 seconds !!!
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Laser - Astrophysical Plasmas - Solar Interior
So now we know that laser plasmas are hot
dense !
We can tune temperature, density etc. so that
they produce spectra to be compared with spectra
from other laboratory and astrophysical sources
!!
Figure - David Attwood, U C Berkeley
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Laser Plasmas as VUV to X-ray Sources
Since a laser plasma is HOT - (Te 10 - 1000 eV)
and (say) you consider it to be a black (or grey)
body, then most emission should be at photon
energies also in the 10 - 1000 eV range, i.e., at
Vacuum Ultraviolet (VUV), Extreme-Ultraviolet
(EUV) and Soft X-ray (SXR) wavelengths !!
Figure from lectures notes of David Attwood, U
Calif.-Berkeley
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Generally Extreme-UV Science Technology is
Growing Rapidly
Industry Lithography Bio-Medical
Microscopy Basic Research Astronomy
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Our Themes
Laser Plasma Light Sources (dev
appls) Instrumentation and techniques Imaging
and Spectroscopy in the UV, VUV, EUV and X-ray
regions Physics of 1. 'Colliding Plasma
Systems' 2. Structure and dynamics of atoms and
ions
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DUAL LASER PLASMA (DLP) EXPERIMENTS
UV - Xray Source
Absorbing Sample
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Dual Laser Plasma (DLP) Photoabsorption
J T Costello et al., Phys.Scr. T34, 77 (1991), E
T Kennedy et al., Opt.Eng 33, 3984 (1994)
No tuning required No vapour required
Flexible Neutral/Multiplycharged/ Refractory
Elements
Dx, DT, I(W/cm2) ? Species choice
Backlighting Plasma Io Both Plasmas I Ioe-snL
Backlighter
Relative Absorption Cross Section sNL Ln(Io/I)
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Synchrotron - Photoion Results- BW3
Undulator XUV Radiation
Li Vapour
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Photoionization as a plasma diagnostic VUV
Photoabsorption Imaging
VUV CCD
Sample
Io(x,y,t)
I(x,y,t)
Pass a collimated VUV beam through the plasma
sample and measure the spatial distribution of
the absorption.
J Hirsch et al., J.Appl.Phys 88, 4953 (2000),
Rev.Sci.Instrum (in press 2003)
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ULtrafast Emission and Absorption Photography
Laser Beam
Wedge
Target
Lens
I-CCD Andor - Belfast lt2 ns shutter time
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Colliding Plasmas Generate a Secondary Plasma !
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Colliding Stars Model System' - 'Colliding
Plasmas'
Is that what's happening here ?
NGC 2346
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Some Other Current Projects

• Photoionization of ions with DLP setup in DCU,
  e.g. Mn2, JPB Vol 38, L1 (2005) accessed gt 500
  times in lt50 days!
• First two-colour DLP (LP Continuum Panther OPA)
  photoabsorption expts on ions - tests for
  FELOPA ?
• Negative ion beams in intense 800 nm fields
  (QUB/MPI/ DCU) Phys. Rev. Lett 93, Art. No.
  223001 (2004)
• Photoionization of ions in merged synchrotron-ion
  beam experiments (Aarhus - Orsay/DCU/John West)
• 'Clean'/ UHV laser plasma (dilute) ion source
  under development at DCU - possible source for
  synchrotron/ FEL expts ?
• Laser plasma X-ray spectroscopy now available at
  DCU - Experience at 6 - 15 Angstrom (XFEL expt'l
  tests ?)

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Conclusions

• Lots happening and projects in
• UV - X-ray Sources - Lasers, Laser plasmas,
  Synchrotron FEL - JC/ETK
• Plasma probing with UV to X-ray radiation -
  spectroscopy imaging - JC/ETK/PVK
• Pulsed Laser Deposition Diagnostics (with SSL)
  - JPM/EMG/MOH
• Lots of Int'l collaborations and opportunities
  to travel
• Come and talk with us if you are interested in
  lasers, plasmas, optics and atomic physics