Energy loss of heavy ions in dense plasma

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Energy loss of heavy ions in dense plasma
Goal To understand the interaction of heavy
ions with hot, dense matter Therefore Study
the charge state evolutions and energy loss of
heavy ions interacting with solids (HMI) and
plasma (GSI). Application Heavy Ion driven
Inertial Confinement Fusion Heavy Ion driven
Material Processing
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Outline

• Experimental setup at GSI
• Plasma- and Laser diagnostic
• pinhole cameras
• X-ray spectroscopy
• visible streak camera
• laser interferometry
• laser output sensor
• PIC simulations of the laser-plasma interaction
• Interaction of Ar ions with solid carbon foils
• charge exchange cross sections
• charge dependent stopping power S(q)
• Outlook

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Experimental setup at GSI
Ion bunches at 103 MHz FWHM 3 ns
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Plasma diagnostic setup
ion beam
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Plasma diagnostic pinhole camera
Magnifying pinhole camera
pinhole camera
hn gt 300 eV / 2 keV
hn gt 300 eV
Te 150 200 eV
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Plasma diagnostic X-ray spectroscopy
Time resolved and space integrated line radiation
of carbon laser produced plasma
time
C4
C4
C5
C5
Ry
Ry
C-foil m500 mg/cm2
l
Te I Lya/ I Heb ne n max of Ry satellites
Te70-100 eV ne1019-1020 cm-3
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Plasma diagnostic vis. streak camera
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Plasma diagnostic laser interferometry
Fringe shifts due to varying electron density, ne
lt 10 20 cm -3
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Laser diagnostic

• Energy 70 110 J
• Focus intensity profile

• Temporal profile
• Reflected light

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PIC simulation
ring focus 27i, r 0.4 mm, FWHM 0.4 mm
t6 ns
t8 ns
t10 ns
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Charge State Evolution of Ar in solid C

• HMI Berlin
• Q3D ?E/E110-4
• Exp f(qi, qf, d) of
• Ar, 4 MeV/u
• Theory
• solution of the
• rate equations
• ? cross sections
• e-capture
• ionization
• excitation
• decay

Blazevic et al., Phys. Rev. A, vol. 61, 032901
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Charge dependent energy loss
DE of Ar _at_ 4 MeV/u in Carbon
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Charge dependent stopping power S(q)
?E(q,d) ?i MCS ? S(q)

• Theory
• Sigmund/Schinner
• Phys. Scr.T92 (2001) 222
• Schiwietz/Grande
• NIM B153 (1999) 1
• Maynard
• NIM A 464 (2001) 86
• Kaneko
• Phys.Rev. A49(4) (1994)2681

Blazevic et al., NIM B 190 (2002) 64
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Outlook

• Upgrade the laser interferometry to l 256 nm,
  tL 0.5 ns
• 4 frame pinhole camera, texp 3 ns
• Improvement of the laser focus
• Benchmarks for the PIC simulation of the plasma
• Calculate the projectiles charge states
  evolution in plasma
• Scale the charge exchange cross sections in
  solid
• matter to plasma conditions
• solve the rate equations
• nN-CTMC simulation of the ion-
• plasma interaction
• Energy loss experiments with the
• PHELIX laser and hohlraum targets

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PIC simulation
ring focus 27d, r 0.3 mm, FWHM 0.4 mm
t8 ns
t9 ns
t10 ns