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Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
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 FusionHeavy Ion driven Material Processing
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
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
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
Experimental setup at GSI
nhelix
mirror
focuslenstarget
ion beam
Ion bunches at 103 MHzFWHM = 3 ns
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
ion beam
visiblestreak camera
laser interferomerty
X-ray streak camera
Laser outputsensor
laser beam
pinhole cameras
Plasma diagnostic setup
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
Plasma diagnostic – pinhole camera
Magnifying pinhole camera
3.36
0.4212.81
8.79
2.61
0.6
pinhole camera
Te ≈ 150 – 200 eV
h > 300 eV h > 300 eV / 2 keV
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
Time resolved and space integrated line radiation of carbon laser produced plasma
Plasma diagnostic – X-ray spectroscopy
time
C-foil m=500 g/cm2
C+5
C+4C+4
C+5
Ry Ry
Te~70-100 eVne=1019-1020 cm-3
Te: I Ly/ I Hene : n max of Ry satellites
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
Plasma diagnostic – vis. streak camera
i
eBs m
TkZc
v
V = 8.84 · 10 6 cm/s
T = 240 eV
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
Plasma diagnostic – laser interferometry
Fringe shifts due to varying electron density, ne < 10 20 cm -3
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
Laser diagnostic
Energy: 70 –110 J
Focus intensity profile
Temporal profile
Reflected light
14 ns
*
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
PIC simulation
ring focus #27i, r = 0.4 mm, FWHM = 0.4 mm
t=6 ns t=8 ns t=10 ns
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
Charge State Evolution of Ar in solid C
HMI BerlinQ3D: ΔE/E=1•10-4
Exp: f(qi, qf, d) of Ar, 4 MeV/u
Theory:solution of the rate equations
cross sectionse-captureionizationexcitationdecay Blazevic et al., Phys. Rev. A, vol. 61, 032901
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
Charge dependent energy loss
E of Ar @ 4 MeV/u in Carbon
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
ΔE(q,d) + бi + MCS S(q)
Charge dependent stopping power 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
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
Outlook
Upgrade the laser interferometry to = 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 projectile´s 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
Abel Blazevic GSI Plasma Physics/TU Darmstadt June 8, 2004
ring focus #27d, r = 0.3 mm, FWHM = 0.4 mm
t=8 ns t=9 ns t=10 ns
PIC simulation
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