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FAIR Meeting,Daresbury 25th January 2006
Laser Induced Nuclear PhysicsAnd the FAIR Programme
Ken Ledingham
Dept of Physics, University of Strathclyde, Glasgow G4 0NG, Scotland & AWE plc Aldermaston, Reading, RG7 4PR, UK
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Is the future of large accelerators limited?
• CERN and GSI have been at the vanguard of nuclear and particle physics for > 50 years.
• However their size is becoming a limiting factor• Many scientists are looking for more compact
accelerators.• Perhaps laser accelerators is a way forward• How big are these conventional
accelerators???
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LEP/LHC TUNNEL AT CERN
27 Km
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Petawatt Particle AcceleratorsFermi PeV Accelerator
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The History of High Intensity Lasers
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Laser Induced Particle Acceleration and Applications• Terawatt= 1012W
• Total Electrical Power Generated in the USA = 1012W
• Petawatt =1015W• There are 15 Petawatt and proposed
Petawatt lasers in the world• Exawatt=1018W
• Zettawatt=1021W
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hν
1MeV
1eV
1TeV
ElectronCharacteristic
Energy
1PeV
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Livingstone Plot
Year of Completion
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Laser Intensity (Wcm-2)1014101510161017101810191020102110221023102410251026102710281029103010311032
Sign
ifica
nt E
vent
s
0
1
2
3
4
5
6
7
8
9
10
11
12
He+He2+
Ne6+Ar10+
Photo-nuclearU82+Photo-pions
U90+Direct nuclear process
Vacuum production of e+/e-Unruh/Hawking radiation
What happens as the laser intensity is increased?
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VULCAN petawatt laser (RAL)
Energy 600 J (on target)Repetition 1 hourWavelength 1.05 μmPulse duration 0.6 ps Intensity ~6x1020 Wcm-2
Maximum pulsesper week ~25
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Petawatt with Extensive Nuclear Shielding
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Laser Nuclear Phenomena
• PET isotope production• Laser induced nuclear transmutation
studies• Laser produced heavy ion reactions• Spallation studies• New experiments including Counter-
propagating beam experiments for positron and muon production
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Proton Production
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Proton Production
• For metals the protons come from hydrogen in water or contaminants on surface or trapped in the solid (H20, 100x more than CH)
• The surface contamination is due to poor vacuum conditions in the target chamber
• We think the proton beams are produced thus:
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E
Target
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E
Target
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E
±±
±
±
±
±±
±
Target
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Target
+
+
++
++++
++
+-
--
---
----
V x B
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E
Target
+ +
+
+
+
++ +
+++
+
-
-
-- -- -
---±±
±±±
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Target
+ +
+
+
+
++ +
+++
+
-
-
-- -- -
---
B B
E
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Target
+ +
+ ++
+++
++
+
+
-
------
-
-
-
B B
+
++
+
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Target+
++
+
+
+
++
+ +++
- ------- --
BB
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Film Maker Falk Ronneberger University of Jena
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How to measure proton energy spectra using a
stack of thin copper foils and activity from a (p,n)
reaction in copper to produce 63Zn (38 min
half life)
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CPA pulse
Altarget
CCD camera
Protons
Cu activation stack Cu activation stack
“BLOW-OFF”DIRECTION
“STRAIGHT THROUGH”DIRECTION
Protons
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Proton Spectra from 100TW
In front of target– “blow-off”
direction
5 cm
5 cm
BACK
5 cm
5 cm
Behind the target –“straight through”
direction
FRONT
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CPA pulse
Target
CCD camera
Protons
0.1m
m0.
1 mm
0.2 5
mm
0.2 5
mm
0.5 m
m0.
5 mm
1.0 m
m1.
0 mm
BACK
Cu activation
stack
Front BackFront
Proton acceleration on Vulcan petawatt
0 10 20 30 40 50 60103
105
107
109
1011
1013
Num
ber o
f Pro
ton(
1/M
eV)
Proton Energy(MeV)
Blow off (Front) Straight through (Behind)
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Proton beam quality measurements
Normalised emittance εN < 0.5 π mm mrad at 40 MeV(c.f. CERN Linac2, protons ~50 MeV: εN ~1.7 π mm mrad)
Film Cu filters
10 μm structure50 μm Au
45 mm
~28 MeV
~35 MeV
1 cm
1 cm
Structure after substracting the general intensity rise in the middle
Source size:~40 μm for 40 MeV; :~150 μm for 4 MeV
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High resolution electron spectroscopy usingHigh resolution electron spectroscopy usingthe ASTRA laser systemthe ASTRA laser system
E ~ 350 mJ, pulse duration ~ 40 fsecFocal spot ~ 25 µmIntensity ~ 2 x 1018 W/cm2
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Electron Acceleration Experiment on Vulcan Petawatt
Krushelnick et al (I.C.) with gas targets have measured electrons with energy 240 MeV on VULCAN
Malka et al on the table top laser LOA have measured 200 MeV electrons at similar intensities
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MonoMono--energetic spectra can be observedenergetic spectra can be observedat higher power (at higher power (ΔΔE/E = 6 %)E/E = 6 %)
E ~ 500 mJ, pulse duration ~ 40 fsecFocal spot ~ 25 µmDensity ~ 2 x 1019 cm-3
Shot-to-shot fluctuations in a) energy spread b) peak energy
Careful control of laserand plasma conditions is necessary
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Properties of a Petawatt Laser at 1021Wcm-2
• Electrons energies up to 500 MeV now mono-energetic
• Protons up to 60 MeV with mono-energetic protons now possible
• Heavy ions with energies up to 10 MeV/ nucleon
• Magnetic Fields up to 600 MG• Photon Pressures up to GBars
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Experiments which can be carried out at GSI
Synergies between Intense Ion (SIS -200 and Laser Beams(Phelix)
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The Physics of Dense Plasmas
• This is the physics of planet interiors and stellar atmospheres
• Visible and UV light cannot be generated through these plasmas
• Short pulses of X rays ~10keV are needed for this especially if high temporal resolution is required
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Phelix as a unique Diagnostic to backlight plasmas generated by SIS 200
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Proton Radiography as an extension of X-rays for investigating matter under
extreme conditionsSIS generated Plasma
Phelix
Proton Beam or photonsProton or
photon detector
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The Combined Capability of Phelix and SIS 200
• Light or proton propagation in dense plasmas
• Equations of state experiments• Supernova shock wave experiments• Phelix providing shock wave and SIS-200
investigating the response of the shock
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KWD Ledingham, P McKenna, J Yang, S Shimizu,T McCanny, L Robson, R P Singhal
Personnel
K Krushelnick, MS Wei,P Nickelson, S Mangles
RJ Clarke, PA Norreys, KL Lancaster, S Karsch
J Galy, J Magill
R Chapman,K Spohr
J Zweit,J Gillies
Patersoninstitute
for Cancer Research
M Zepf
M Roth, E Brambrink,M Hegelich