j. fils for the phelix team gsi helmholtzzentrum für schwerionenforschung, darmstadt, germany sept....
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![Page 1: J. Fils for the PHELIX team GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany Sept. 27 2010 Speyer EMMI Workshop The PHELIX High Energy](https://reader036.vdocuments.net/reader036/viewer/2022062518/56649d6c5503460f94a4c30e/html5/thumbnails/1.jpg)
J. Fils for the PHELIX team
GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
Sept. 27 2010SpeyerEMMI Workshop
The PHELIX High Energy Laser Facility
![Page 2: J. Fils for the PHELIX team GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany Sept. 27 2010 Speyer EMMI Workshop The PHELIX High Energy](https://reader036.vdocuments.net/reader036/viewer/2022062518/56649d6c5503460f94a4c30e/html5/thumbnails/2.jpg)
Overview
![Page 3: J. Fils for the PHELIX team GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany Sept. 27 2010 Speyer EMMI Workshop The PHELIX High Energy](https://reader036.vdocuments.net/reader036/viewer/2022062518/56649d6c5503460f94a4c30e/html5/thumbnails/3.jpg)
Switch Yard
70 m
Double-pass 31.5 cm amplifier
Schematic view of the PHELIX facility
Injection box
Mai
n A
mp
lifi
erS
enso
r
Faraday
Isolator
fs Front End
Fiber ns Front End
Pre-amplifier2 x 19 mm heads1 x 45 mm head
X-ray Lab(low energy)
TW compressor
Target chamber
Z6 experimental
area
Heavy ions
Laser Bay
Compressor
Target Chamber se
nso
r
Areas recently improved
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Performance of PHELIX in 2010
Long pulse Short pulse
Pulse duration 0.7 – 20 ns 0.5 – 20 ps
On-target energy 0.3 – 1 kJ 120 J
Maximum intensity 1016 Wcm-2 1020 Wcm-2
Repetition rate at Joule level
1 shot every 3 min
Repetition rate at maximum power
1 shot every 1h*
Temporal contrast 50 dB60 to 80 dB depending on
settings
* with use of the adaptive optics
![Page 5: J. Fils for the PHELIX team GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany Sept. 27 2010 Speyer EMMI Workshop The PHELIX High Energy](https://reader036.vdocuments.net/reader036/viewer/2022062518/56649d6c5503460f94a4c30e/html5/thumbnails/5.jpg)
A selection of representative experimental results
• Progress in ion stopping (Courtesy of A. Frank)
– PHELIX together with nhelix yields significant improvement in quality of experimental data.
• Progress in particle acceleration (Courtesy of K. Harres)
– Up to 14 MeV protons were collimated using a coil
• Progress in X-ray laser development (Courtesy of D. Zimmer)
– The DGRIP scheme achieves lasing at 7.26 nm with as little as 30 J of pump laser energy.
reference 6. 8 MeV 9.0 MeV
Converging proton beams
Stack located 405 mm from the target
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Status &Recent Improvements
of the Facility
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Adjustable pulse length and improved intensity contrast
1050 1055 10600
0.5
1Shot 525
Wavelength (nm)
Inte
nsi
ty (
no
rmal
ized
)
5.9 nm
• Modified pulse stretcher for adjustable pulse duration control
• A series of 4 Pockels cells distributed in the font end avoids pre-pulses
-5 -4 -3 -2 -1 0 110-10
10-8
10-6
10-4
10-2
100
inte
nsi
ty (
no
rmal
ized
)
ASE level
Time (ns)
• Spectral width enhanced by use of a birefringent filter
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Main amplifier with energies in the kilojoule range
With a gain of up to 100 (17.5 kV), the main amplifier works as expected, only limited by the damage threshold of the Faraday rotator
0
100
200
300
400
500
600
700
800
900
1000
5 6 7 8 9 10 11
17.5 kV
Ou
tpu
t en
erg
y (J
)
Pre/amplifier energy (J)
17 kV
16 kV
16.5 kV
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Direct on-shot measurement of the pulse duration
• A single-shot autocorrelator is used for alignment and on-shot measurements
-2000 0 20000
0.2
0.4
0.6
0.8
1
time delay (fs)
Fourier transform limit
measurement
Together with a twofold increase in energy, we plan to upgrade the peak power to more than 750 TW in 2010
Shot 1071
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Active wavefront correction
Incoming pulse(distorted wavefront)
DeformablemirrorWavefront
sensor
Outgoing pulse(corrected wavefront)
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Active wavefront correction
• Three types of aberrations are being found in a complex laser system
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Active wavefront correction
• On-shot aberrations at pre-amplifier level reduced by 60%
• Waiting time between pre-amplifier shots reduced from 10 down to 3 minutes
• Increase of main-amplifier repetition rate to 1 shot/hour.
without correction with correction
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We plan to improve the contrast by use of an ultrafast OPA
2 nJ2 nJ
1 ps1 ps
MiraMiraFreq.Freq.shiftershifter
Stretch.Stretch.Ampli.Ampli.Yb:KYWYb:KYW
Comp.Comp.
Stretch.Stretch.× 10× 10
1054 nm1054 nm
100 fs100 fs
OPAOPA
1040 nm, 100 ps1040 nm, 100 psSignalSignal
300 µJ300 µJ
• ASE is mostly created in the front-end because of low power available from the oscillator
• Boost this power using an ultrafast optical parametric amplifier
– A gain in contrast of 105 expected
– Low pre-pulse level
– Higher energy stability because of diode-pumped amplifier
This development is done within the frame of the Helmholtz Institut Jena (HIJ)
SHGSHG
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Extension of the experimental capabilities at Z6
Ion beam
2ω beam line
(in preparation)
10° beam line
(in operation)
100 TW beam line
(in preparation)
target
chamber
PHELIX
beam
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PHELIX celebrates 2 years of operation
• PHELIX delivered more than 100 shifts in 2009, in line with the prediction
– The facility delivered its 2000th documented shot.
– An internal beamtime allowed to test the amplifier up to 920 J.
• PHELIX has a strong impact on the scientific program of GSI.
– Significant results were obtained in ion stopping experiments, manipulation of laser-accelerated particles and coherent X-ray generation
• We operate a recent facility which is being constantly improved
– PHELIX operates in the ns to sub-ps regime at three different experimental places
– Innovative solutions in many locations implemented
– Future upgrades are being actively pursued in
• contrast improvement (uOPA project)
• frequency conversion (2 project)
• experimental capability (100 TW project)
Summary
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Thank you for your attention
Picture: G. Otto, GSI