laser-driven fusion-triggered liquid transmutator · 2020. 12. 6. · beam width, µm 3.6 laser...
TRANSCRIPT
T. Tajima, A. Necas, G. Mourou, S. Gales, and M. LeroyTAE, Ecole Polytechnique, IPN Orsay, and U. Strasbourg
T. Massard, Y. Brechet, M. Binderbauer, J. Tanner, K. Hattfield, S. David, F. Carre, J. Tommasi, P. Martin, B. Boullis, M. Mizumoto, Y. Fujiie
8th ICUIL ConferenceLindau, Germany
Sept. 12, 2018
Laser-Driven Fusion-Triggered Liquid Transmutator
New Philosophy and Scienceto Fulfill Self-responsibility
20th Century: Science of Discovery
à
21st Century:Toilet Science:
Responsive tosocietal issuesself-inflicted Tajima
(Jan. 18,2005)
From “Kitchen Science” to “Toilet Science”
Human are superior in working together via communication, which won out over Neanderthals.They have been extremely good in “kitchen science” to get to “food”. However, they have been negligent or weak in thinking “toilet science” to ”treat waste”.
Examples:1. Petroleum civilization: Convenient modern life ----à Homo Sapiens-triggered climate change2. Space: Sputnik in 1957 ----à Millions of space debris endanger astronauts and satellites3. Particle physics: appetite for higher energy acceleration -----à need to compactify and radio-nontoxic, including high
energy beam dump4. Nukes: Only 4 years to get Fermi’s Chicago pile (1940) ----à Nowhere to flush radioactive waste
Go from Solid to Liquid ⇒ Safety ↗- Intrinsic safety ---no Fukushima;Chernobyl
Thermal expansion and neutron-capture up (as T ↗)
Opera>on at 1 atm
- Passive safety: liquid tank=frozen plug ---no Fukushima;Chernobyl
- External control knobs increased delayed n (s.a. Hf) , control rods, control of n-source
- Real-time monitor and AI: liquid transparency
- No fuel processing: solid fuel fabrica>on not needed
Idaho
Our “Toilet” for Nukes:
Idaho National Lab – Integral Fast Reactor (1986)
“…back in 1986, we actually gave a small [20 MWe] prototype advanced fast reactor a couple of chances to melt down. It politely refused both times.”
Motivation for transmutation of MA
Dura0on Reduc0on1000x
Volume Reduc0on 100x F. Carre (2007)
transmutationof spent fuel MA
à
Reduction of radiotoxicity (Japanese strategy)
MS N L ( . (3 3p 12
A 9 p 05
7 7 FA F
( A % F r 7 FT c IP A
s 9 F mF C r
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102
103
104
105
106
107
108
109
1010
100 101 102 103 10 4 105 106 10 7
Time after Reprocessing (year)
No Transmutation
LLFP : FPs with T1/2 ≥ 30 years
ALI I
nges
tion
Haza
rd In
dex
of H
LWpe
r One
Met
ric T
on o
f Fre
sh F
uel
100% MA & LLFP
99.9% MA
99.9% MA & LLFP
nat. U (1 ton)
90% transmutationfor MA & LLFP
99.5% MA & LLFP
100% MA
0.2% U ore (1 ton)
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M. Mizumoto(2006)
Neutron Energy Window: MA Fission Triggered (1-15MeV)
Neutron Absorption (Red) vs Fission (Green) Cross Sections
241Am + n à242Am241Am + n à FPa + FPb+… + (3-7) “n” s + energy
Am – 241 Cm – 243
Neutron cross-sections in > 1MeV:Fission > Neutron Absorption
8
14.1 MeV Fusion Neutrons
Our Liquid Transmutator (our “toilet”) : Design• Safe by Liquid solution-FLiBe (molten salt with very high boiling pt; passive safety
valve; thermal expansion; )• Safe by realtime monitor and control (by passive observation of gamma
emission, by laser and laser Compton gamma)• Safe operation, including delayed neutron treatments tec. (O(100MW))• Light burden on accelerator-driven Fusion Trigger (flexibility, safety, compact,
mobile, inexpensive) O(100kW)• Small and low energy Fusion trigger (compact and cheap) O(MW)• Possible mixing of Pu into MA: hard for weaponization• à Confluence of many technologies : catapult from low-energy laser-driven
accelerator-driven fusion, to fusion-triggered fission; safe liquid-phased MSR ; liquid MA monitored / controlled realtime by laser; chemical separation in liquid
Energy CatapultingNeutron Multiplying
~10 % deuterons achieve fusion140 keV deuteron beam
200 MeV Fission-Q
14 MeV neutrons
!"#$%&''
~)* +, Neutrons mul?ply
Dissolved solution of
LiF-BeF2 (FLiBe) – molten salt+
Transuranics (Pu, Am, Cm, Np)+
Fission products (Sr, Zr, Tc, Te, Cs … )
Laser – neutron source
Electrostatic accelerator – neutron source
OR
ES accelerator 150 keV deuteron 14 MeV neutron Transmute Pu+MA by fission
Active laser monitoring
• Passive gamma• NRF
Control rods
a –neutron source tankb – Transmutation tankc – Laser pulsed1 –DT or DD fusion neutronsd2 – deuteron beame – keyholef – mirrorg – entrance windowh – nanometric foil [1-10 nm]i – solid titanium-tritium target at the back end of keyhole
Single keyhole zoomSingle keyhole zoom A
B
Laser driven neutron sources
Mourou et al.: Nature Photon. (2013)
CAIL (Coherent Acceleration of Ions by Laser) vs TNSA
à#
from (Tajima et al. 2017)
# : the regime our transmutator operates
Deuteron energy vs. thickness of foil
Steinke et al (2010)
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Emax[M
eV]
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target thickness [normalized to laser intensity]
Ener
gy
Optimum parameters (sweet-spot) for ion acceleration at
Our simulations: Optimal Thickness of Target Coherent Acceleration of Ions by Laser (CAIL)
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Experiment: Our simulation
Highly-energetic Deuterons accelerated by laser in CAIL
Deuteron Energy [MeV]
Theoretical max ion energy
Parameter Value
Intensity*, W/cm2 5x1017
Pulse length, fs 45
Beam width, µm 3.6
Laser energy, mJ 6
Foil thickness, nm 10
Skin depth, nm 25.3
Electron density 1/cc 4.4x1022
Critical density 1/cc 1x1021
Rep rate, kHz 10
(Tajima et al, 2009; Steinke et al, 2010)
deut
eron
s
(Coherent Acceleration of Ions by Laser)
Fusion cross section
Scan Laser Pulse Length at
Pulse length [fs]
Efficie
ncy
[%]
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� = a0<latexit sha1_base64="B6A1Fmwwm6HaZkTpKk0fhw2DCts=">AAAB83icbVBNS8NAEJ3Ur1q/qh69LBbBU0lE1ItQ8OKxgv2AJpTJdtMu3WzC7kYooX/DiwdFvPpnvPlv3LY5aOuDgcd7M8zMC1PBtXHdb6e0tr6xuVXeruzs7u0fVA+P2jrJFGUtmohEdUPUTHDJWoYbwbqpYhiHgnXC8d3M7zwxpXkiH80kZUGMQ8kjTtFYyfc1H8ZIbgn23X615tbdOcgq8QpSgwLNfvXLHyQ0i5k0VKDWPc9NTZCjMpwKNq34mWYp0jEOWc9SiTHTQT6/eUrOrDIgUaJsSUPm6u+JHGOtJ3FoO2M0I73szcT/vF5mopsg5zLNDJN0sSjKBDEJmQVABlwxasTEEqSK21sJHaFCamxMFRuCt/zyKmlf1D237j1c1hpXRRxlOIFTOAcPrqEB99CEFlBI4Rle4c3JnBfn3flYtJacYuYY/sD5/AGxeZDA</latexit><latexit sha1_base64="B6A1Fmwwm6HaZkTpKk0fhw2DCts=">AAAB83icbVBNS8NAEJ3Ur1q/qh69LBbBU0lE1ItQ8OKxgv2AJpTJdtMu3WzC7kYooX/DiwdFvPpnvPlv3LY5aOuDgcd7M8zMC1PBtXHdb6e0tr6xuVXeruzs7u0fVA+P2jrJFGUtmohEdUPUTHDJWoYbwbqpYhiHgnXC8d3M7zwxpXkiH80kZUGMQ8kjTtFYyfc1H8ZIbgn23X615tbdOcgq8QpSgwLNfvXLHyQ0i5k0VKDWPc9NTZCjMpwKNq34mWYp0jEOWc9SiTHTQT6/eUrOrDIgUaJsSUPm6u+JHGOtJ3FoO2M0I73szcT/vF5mopsg5zLNDJN0sSjKBDEJmQVABlwxasTEEqSK21sJHaFCamxMFRuCt/zyKmlf1D237j1c1hpXRRxlOIFTOAcPrqEB99CEFlBI4Rle4c3JnBfn3flYtJacYuYY/sD5/AGxeZDA</latexit><latexit sha1_base64="B6A1Fmwwm6HaZkTpKk0fhw2DCts=">AAAB83icbVBNS8NAEJ3Ur1q/qh69LBbBU0lE1ItQ8OKxgv2AJpTJdtMu3WzC7kYooX/DiwdFvPpnvPlv3LY5aOuDgcd7M8zMC1PBtXHdb6e0tr6xuVXeruzs7u0fVA+P2jrJFGUtmohEdUPUTHDJWoYbwbqpYhiHgnXC8d3M7zwxpXkiH80kZUGMQ8kjTtFYyfc1H8ZIbgn23X615tbdOcgq8QpSgwLNfvXLHyQ0i5k0VKDWPc9NTZCjMpwKNq34mWYp0jEOWc9SiTHTQT6/eUrOrDIgUaJsSUPm6u+JHGOtJ3FoO2M0I73szcT/vF5mopsg5zLNDJN0sSjKBDEJmQVABlwxasTEEqSK21sJHaFCamxMFRuCt/zyKmlf1D237j1c1hpXRRxlOIFTOAcPrqEB99CEFlBI4Rle4c3JnBfn3flYtJacYuYY/sD5/AGxeZDA</latexit><latexit sha1_base64="B6A1Fmwwm6HaZkTpKk0fhw2DCts=">AAAB83icbVBNS8NAEJ3Ur1q/qh69LBbBU0lE1ItQ8OKxgv2AJpTJdtMu3WzC7kYooX/DiwdFvPpnvPlv3LY5aOuDgcd7M8zMC1PBtXHdb6e0tr6xuVXeruzs7u0fVA+P2jrJFGUtmohEdUPUTHDJWoYbwbqpYhiHgnXC8d3M7zwxpXkiH80kZUGMQ8kjTtFYyfc1H8ZIbgn23X615tbdOcgq8QpSgwLNfvXLHyQ0i5k0VKDWPc9NTZCjMpwKNq34mWYp0jEOWc9SiTHTQT6/eUrOrDIgUaJsSUPm6u+JHGOtJ3FoO2M0I73szcT/vF5mopsg5zLNDJN0sSjKBDEJmQVABlwxasTEEqSK21sJHaFCamxMFRuCt/zyKmlf1D237j1c1hpXRRxlOIFTOAcPrqEB99CEFlBI4Rle4c3JnBfn3flYtJacYuYY/sD5/AGxeZDA</latexit>
Shorter pulse higher efficiency coupling
!L = 2⇡c�
Laser accelerator : Efficient coupling ( ~50%) to ions in CAILThe shorter the laser pulse, the higher deuteron acceleration (totally different from TNSA)Very little energy needed per pulse (mJ).
70th Birthday
Danke Schoen!