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